Final Steel-Cut Release Gate

Before Steel Cut Injection Mold Checklist: 40 Go/No-Go Checks

Use this checklist to confirm whether an injection mold project is ready for core and cavity machining. The final release should connect the approved product definition, critical requirements, mold-design approval, unresolved items and sign-off responsibility to one clear GO or NO-GO steel-cut decision.

Quick Answer

Steel should be released only after the required checks have been reviewed, release-critical OPEN items have been closed or formally accepted, required evidence is attached, and the responsible project stakeholders have approved machining.

  • Released 2D, 3D and revision confirmed
  • CTQs and measurement references defined
  • Mold design and project-specific assumptions approved
  • Open items assigned, evidenced and closed before release
Item Status PASS FAIL OPEN Final Decision GO / NO-GO
View the 40 Go/No-Go Checks → Injection Mold Design Decision Guide →
Before steel cut injection mold review with engineering drawings and release checklist
Final engineering release review before core and cavity machining begins.
Steel-Cut Release Rule

How PASS, FAIL and OPEN Determine the Steel-Cut GO / NO-GO Decision

Every item in the before-steel-cut checklist should have one clear status. The purpose is not to assign a general risk score, but to show whether the requirement is closed, unacceptable, or still unresolved before core and cavity machining is authorized.

Release principle: a final GO decision should be based on closed requirements and objective evidence. Release-critical issues should not remain hidden inside comments, meeting notes or an informal “accepted risk” label.
PASS Requirement is confirmed and closed

The applicable requirement has been reviewed, the required evidence is available, and no release action remains open for that checklist item.

FAIL Current condition does not meet release requirements

The design, requirement or supporting evidence is not acceptable for release. Corrective action and re-review are required before the item can be closed.

OPEN Requirement is not yet fully resolved

Information, approval, modification or evidence is still pending. The item remains open until an owner completes the required action and the result is reviewed.

Final Steel-Cut Decision

Item status and project authorization are different levels of control. PASS, FAIL and OPEN apply to individual checks; GO or NO-GO applies to the complete steel-cut release.

Final Decision — GO Steel machining may be released

Release-critical checklist items are closed, required evidence is available, approved deviations are documented where applicable, and the required project sign-offs have been completed.

Final Decision — NO-GO Steel machining remains blocked

Any release-critical FAIL or unresolved release-critical OPEN item keeps the project at NO-GO until corrective action, evidence and the required re-approval are completed.

Steel-Cut Release Logic at a Glance

The checklist should make the release consequence visible without requiring an RPN calculation or a separate severity-ranking method.

Status Meaning Required Action Effect on Steel Cut
PASS Requirement and evidence are closed. Record evidence reference and closure. Does not block release.
FAIL Requirement is not acceptable. Correct, re-review and obtain approval. Release-critical FAIL = NO-GO.
OPEN Information, action or approval is still pending. Assign owner, close action and attach evidence. Release-critical OPEN = NO-GO until closed.
GO Final project release condition is satisfied. Complete final authorization and release machining. Core and cavity steel may proceed.
NO-GO Release condition is not yet satisfied. Keep machining blocked until required closure is complete. Steel cut is not authorized.

With the release rule defined, the next step is to apply the same PASS / FAIL / OPEN logic across the complete 40-item steel-cut checklist.

40-Item Steel-Cut Checklist

40 Go/No-Go Checks Before Injection Mold Steel Is Released

Review each item against the current released project data. Mark the item PASS, FAIL or OPEN, record the supporting evidence, and assign responsibility where action is still required. The checklist is a release-control record—not a substitute for the detailed engineering reviews referenced by each project.

Project / Mold No.
Part No.
Customer / Program
Released Revision
Review Date
Project Engineer
Item Status PASS FAIL OPEN Release-critical FAIL or OPEN items prevent final GO until closed or formally resolved through the approved project process.
No. Release Check Status Evidence / Reference Owner
A. Product Definition & Revision Control
01 Latest released 3D CAD is identified and matches the geometry intended for tooling. PASS / FAIL / OPEN Released CAD file / revision reference Project Engineer
02 Released 2D drawing revision matches the approved 3D data and known dimensional requirements. PASS / FAIL / OPEN Released drawing Project Engineer
03 ECO, customer change or revision updates are incorporated into the release package. PASS / FAIL / OPEN ECO / change record Project Engineer
04 Part orientation and relevant assembly context are confirmed for mold-design decisions. PASS / FAIL / OPEN Assembly data / approved notes Product / Project Eng.
05 Unresolved product-geometry questions are closed before machining release. PASS / FAIL / OPEN Issue log / approved clarification Project Engineer
B. CTQ, Datum & Acceptance Definition
06 Release-critical CTQs are identified on the drawing, specification or agreed project record. PASS / FAIL / OPEN CTQ list / balloon drawing Quality / Product Eng.
07 Datum references are consistent with part function and the intended measurement approach. PASS / FAIL / OPEN Drawing / inspection concept Quality Engineer
08 Mating, sealing, clip, connector or assembly interfaces that affect release are clearly identified. PASS / FAIL / OPEN Assembly drawing / CTQ record Product / Quality Eng.
09 Customer-defined cosmetic or visible zones are documented where appearance affects mold decisions. PASS / FAIL / OPEN Appearance standard / marked CAD Customer / Project Eng.
10 Measurement feasibility for release-critical features is reviewed before steel dimensions are finalized. PASS / FAIL / OPEN Inspection concept / quality review Quality Engineer
C. Resin, Shrink & Material Assumptions
11 Exact production resin grade is confirmed or the approved material rule is documented. PASS / FAIL / OPEN Material specification Project / Material Eng.
12 Reinforcement, additives and relevant grade modifiers are known where they can affect molding or dimensions. PASS / FAIL / OPEN Material datasheet / spec Material Engineer
13 Shrink basis used for mold design is documented and linked to the intended production material. PASS / FAIL / OPEN Shrink basis / design record Mold Designer
14 Material conditioning or moisture assumptions are defined where relevant to the selected grade. PASS / FAIL / OPEN Material / process requirement Molding Engineer
15 Material-related dimensional or appearance risks have been reviewed before steel release. PASS / FAIL / OPEN DFM / risk review record Project Team
D. Mold Layout, Parting & Mechanism Approval
16 Parting-line and shutoff concept is approved for the released part geometry. PASS / FAIL / OPEN Approved mold design Mold Designer
17 Slider, lifter or core-pull motion is reviewed for required movement and interference risk. PASS / FAIL / OPEN Mold assembly / motion review Mold Designer
18 Insert, wear-area and replaceable-feature strategy is agreed where applicable. PASS / FAIL / OPEN Released mold design Tooling Engineer
19 Fragile or insufficient steel conditions have been reviewed and unresolved areas are closed. PASS / FAIL / OPEN Design review / issue closure Mold Designer
20 Mold layout, cavity orientation and cavity identification are approved before core and cavity machining. PASS / FAIL / OPEN Released mold layout Tooling Engineer
E. Filling, Gate & Venting Decisions
21 Gate type and location are approved for the current product and mold layout. PASS / FAIL / OPEN Approved gate layout Mold / Molding Eng.
22 Runner or hot-runner concept and relevant interfaces are confirmed where applicable. PASS / FAIL / OPEN Runner / supplier layout Tooling Engineer
23 Filling-related weld-line, air-trap or appearance risks have been reviewed against critical part zones. PASS / FAIL / OPEN DFM / flow-risk review Molding Engineer
24 Venting approach has been reviewed for known filling and shutoff risk areas. PASS / FAIL / OPEN Released mold design Mold Designer
25 Required flow, warpage or equivalent engineering risk review is closed when triggered by project complexity. PASS / FAIL / OPEN Simulation / engineering justification Project Engineer
F. Cooling, Ejection, Steel-Safe & Machining Readiness
26 Cooling circuit concept is approved for the released mold design. PASS / FAIL / OPEN Cooling layout / mold design Mold Designer
27 Ejection locations and related marking or deformation risks are reviewed before machining. PASS / FAIL / OPEN Ejection layout / review record Mold / Molding Eng.
28 Project-specific steel-safe or tuning strategy is documented for selected critical features where required. PASS / FAIL / OPEN Released mold drawing / notes Mold Designer
29 CNC, EDM, electrode and assembly access have been reviewed for the released tooling concept. PASS / FAIL / OPEN Manufacturing review Tooling Engineer
30 Required utilities, sensors, connectors and maintenance access are defined where applicable. PASS / FAIL / OPEN Mold specification / layout Tooling Engineer
G. Risk Closure & Release Evidence
31 Release-critical risks have a documented review record and responsible owner. PASS / FAIL / OPEN Risk register / review record Project Engineer
32 All release-critical FAIL items have been corrected and re-reviewed. PASS / FAIL / OPEN Closure evidence Issue Owner
33 Release-critical OPEN items are closed or processed through the approved deviation / acceptance route. PASS / FAIL / OPEN Open-item log / approval Project Engineer
34 Required evidence references are attached or traceable to the steel-cut review. PASS / FAIL / OPEN Release evidence pack Project Engineer
35 Any approved non-blocking post-release actions are separately documented with owner and due date. PASS / FAIL / OPEN Action log / approval record Project Engineer
H. Responsibility, Sign-Off & Final Authorization
36 Customer or product-engineering approval is complete where required by the project. PASS / FAIL / OPEN Customer / product approval Customer / Product Eng.
37 Project Engineer / PM release review is complete and outstanding actions are correctly classified. PASS / FAIL / OPEN Project release review Project Engineer / PM
38 Mold-design / tooling-engineering sign-off is complete for the released manufacturing definition. PASS / FAIL / OPEN Mold-design approval Mold Designer / Tooling
39 Quality and measurement readiness is approved where required for release-critical CTQs. PASS / FAIL / OPEN Quality review / measurement plan Quality Engineer
40 Final GO / NO-GO authorization is recorded with the released revision, date and responsible approvers before machining starts. PASS / FAIL / OPEN Signed steel-cut release record Authorized Project Team

Need to rank risks before release? This checklist records whether an item is closed for steel release. Severity, occurrence, detection and RPN-based prioritization belong in the dedicated risk-assessment process.

Injection Mold Risk Assessment Checklist →
Steel-Cut Evidence Pack

What Evidence Should Be Ready Before Injection Mold Steel Is Cut?

A PASS should be supported by a traceable project record, not only by a verbal agreement or meeting comment. Before final steel release, the team should be able to identify the product revision, critical requirements, material assumptions, approved mold definition, technical closures and the final authorization record.

Evidence principle: the objective is not to create the same document package for every mold. The evidence should be sufficient to show what was approved, what assumptions were used, what release-critical issues were closed and who authorized machining.
Evidence 01 Released Product Definition

The approved 2D drawing, 3D CAD and revision reference should clearly identify the product geometry being used for tooling.

Evidence 02 CTQ, Datum and Measurement Reference

Release-critical characteristics, datum relationships and the intended measurement approach should be documented where they affect mold sizing or acceptance.

Evidence 03 Resin Grade and Shrink Basis

The intended production material and the shrink basis used for mold design should be identifiable before cavity dimensions are committed to machining.

Evidence 04 Approved Mold Design Definition

The released mold layout should show the approved design condition used for parting, mechanisms, filling, cooling, ejection and other machining-relevant decisions.

Evidence 05 DFM and Risk Closure Record

Release-critical design questions, review comments and technical risks should have a traceable closure record or an approved deviation where the project permits one.

Evidence 06 Final Steel-Cut Authorization

The final release record should identify the approved revision, review date, decision and responsible approvers before machining begins.

Minimum Release Record by Evidence Type

The exact file names and formats can vary by project, but the release record should make the approved basis easy to identify and retrieve.

Evidence Category Typical Release Record Why It Supports Steel Release Timing
Product definition Released 2D drawing, 3D CAD and revision reference Confirms which product geometry the mold is being built to. Required before release
CTQ and datum definition CTQ list, balloon drawing, datum or inspection reference Connects mold decisions to the characteristics that affect functional acceptance. Required where applicable
Material basis Resin specification and documented shrink assumption Establishes the material basis used for cavity sizing and relevant molding assumptions. Required before cavity sizing is released
Mold-design approval Released mold layout, approved 3D design or equivalent controlled design record Shows the manufacturing definition authorized for tooling. Required before machining
Technical closure DFM comments, engineering review record, risk-closure log or approved deviation Demonstrates that release-critical technical questions have not been left unresolved. Required for triggered issues
Final authorization Signed steel-cut release form or controlled digital approval Records the formal GO / NO-GO decision and responsible approvers. Required immediately before release
T0 / T1 results, FAI and PPAP are not pre-steel-cut completion records

Trial results, production-part inspection evidence and customer production-approval packages are generated later in the mold validation and production-release process. They should not be presented as documents that must already be completed before the first steel-cut authorization.

Once the required evidence is identified, any remaining OPEN item needs a named owner, a defined closure action and a traceable re-review before final steel-cut authorization.

Open-Item Closure

How Should OPEN Items Be Closed Before Steel Cut?

An OPEN item should identify a specific unresolved requirement—not a vague concern. Before steel release, the record should show who owns the issue, what action is required, what evidence will demonstrate closure, who will re-review it and when the final status changes from OPEN to a closed condition.

Closure principle: an issue is not closed because it was discussed, assigned or added to a meeting note. Closure requires a completed action, supporting evidence and a documented re-review against the original release requirement.
Step 01 Define the Issue

Record the exact requirement, question or release condition that remains unresolved.

Step 02 Assign the Owner

Name the person or function responsible for completing the required action.

Step 03 Define Closure Evidence

State what drawing, approval, calculation, review or other record will prove the issue is resolved.

Step 04 Complete Re-Review

Verify the completed action against the original steel-release requirement.

Step 05 Update Final Status

Record PASS or FAIL, closure date and the evidence reference before final authorization.

What Should an OPEN-Item Closure Record Contain?

A simple closure log is usually more useful than a long narrative. Each unresolved release item should be traceable from identification through final disposition.

Record Field What to Record Why It Matters
Issue ID Unique reference number linked to the checklist or review record. Prevents the same issue from being lost between meetings, revisions or departments.
Issue Description Clear description of the unresolved requirement and the affected drawing, CTQ or mold decision. Defines what must actually be resolved before closure.
Owner Named person or responsible engineering function. Establishes accountability for completing the action.
Required Action Specific correction, clarification, approval or review that must be completed. Converts an open concern into an executable closure task.
Due Date Target date for completing the required action. Keeps the issue aligned with the planned steel-release date.
Closure Evidence Drawing revision, customer approval, design update, engineering review, calculation or other applicable record. Demonstrates that closure is based on evidence rather than verbal confirmation.
Recheck By Person or function responsible for verifying the completed action. Separates completion of an action from acceptance of its result.
Final Status & Closure Date PASS or FAIL, date of re-review and final evidence reference. Provides the auditable endpoint needed for steel-cut authorization.
Release-Critical OPEN Keep the project at NO-GO

If the unresolved issue can affect released geometry, cavity sizing, CTQs, fit, function, appearance acceptance, mold mechanism or another machining-critical decision, steel release remains NO-GO until the issue is closed or formally resolved through the approved project process.

Approved Non-Blocking Action Track separately after steel release

An action that does not change the released machining definition may be tracked after steel release only when its impact has been reviewed, responsibility is assigned and the applicable project authority has formally accepted the disposition.

Example of a Traceable Closure Record

The exact form can vary, but the record should make the original issue, action, evidence and final disposition easy to follow.

Open Item Customer datum clarification pending
Required Action Obtain approved drawing clarification
Closure Evidence Released drawing revision and approval record
Final Status PASS — re-reviewed before steel release

After all release-critical OPEN items are closed, the remaining step is to confirm who is responsible for product approval, project coordination, mold-design release, quality review and the final steel-cut authorization.

Responsibility & Sign-Off

Who Is Responsible for Approving Steel Cut?

Steel-cut approval should not depend on one engineer informally saying the mold is ready. Product requirements, project closure, mold-design readiness and measurement feasibility are owned by different functions, so the final release record should make each responsibility explicit.

Responsibility principle: each approver should confirm only the requirements within their authority. Final GO should represent a coordinated release of the product definition, project status, mold design and quality basis—not a transfer of all technical responsibility to one signer.
Responsibility 01 Customer / Product Engineer

Confirms the released product definition, customer-controlled requirements, functional or appearance expectations, approved deviations and any product-side decisions required before tooling is committed.

Responsibility 02 Project Engineer / Project Manager

Coordinates the release package, confirms revision alignment, tracks OPEN-item closure, verifies required approvals are present and controls the final steel-cut review record.

Responsibility 03 Mold Designer / Tooling Engineer

Confirms the released mold definition, parting and mechanism decisions, machining readiness, project-specific steel-safe strategy and closure of tooling-design issues that affect steel.

Responsibility 04 Quality Engineer

Confirms that release-critical CTQs, datum references and planned measurement methods are sufficiently defined for the characteristics that influence tooling release.

Steel-Cut Approval Responsibility Matrix

The exact approval flow can vary by organization and customer, but the release record should distinguish product approval, project coordination, tooling approval and quality review.

Role Primary Approval Responsibility Typical Evidence Reviewed Release Question
Customer / Product Engineer Product definition and customer-controlled acceptance requirements Released 2D/3D, product specifications, appearance or functional approvals, accepted deviations Is the product definition approved for tooling?
Project Engineer / PM Release coordination and OPEN-item closure Revision record, checklist, issue log, evidence pack and approval status Is the complete release package ready for decision?
Mold Designer / Tooling Engineer Mold-design and machining readiness Released mold design, mechanism review, machining notes and tooling-risk closure Is the tooling definition ready to be machined?
Quality Engineer CTQ, datum and measurement readiness CTQ references, datum definition and planned inspection method Can release-critical characteristics be verified later?

A Practical Steel-Cut Sign-Off Sequence

The sequence should prevent one department from authorizing machining while a release-critical requirement remains unresolved elsewhere.

Step 01 Confirm Product Release

Verify the product revision and customer-controlled requirements.

Step 02 Confirm Technical Closure

Close release-critical FAIL and OPEN items with evidence.

Step 03 Confirm Tooling Readiness

Approve the mold definition and machining-relevant decisions.

Step 04 Record Final Authorization

Record the GO / NO-GO decision, date, revision and approvers.

Minimum Final Sign-Off Record
Customer / Product Approval
Project Engineer / PM
Mold Design / Tooling
Quality Review

Once responsibility and sign-off are complete, the final release record can document the approved revision, evidence references and formal GO / NO-GO authorization to start core and cavity machining.

Final Steel-Cut Authorization

Record the Final GO / NO-GO Decision Before Machining Starts

The final steel-cut record should convert the completed checklist, evidence pack, OPEN-item closure and required approvals into one controlled authorization. The decision should identify exactly which product and mold revisions were reviewed and whether machining is formally released.

Authorization principle: the final GO is revision-specific and evidence-based. It should not rely on an email subject line, verbal approval or an unsigned meeting note that does not identify the released product data, mold design and responsible approvers.
Project / Mold No.
Part No.
Customer / Program
Released Part Revision
Released Mold Revision
Steel-Cut Review Date
Release Check 01 40-Item Checklist Reviewed

All applicable checks have a current PASS, FAIL or OPEN status.

Release Check 02 Critical Items Closed

No release-critical FAIL or unresolved release-critical OPEN item remains.

Release Check 03 Evidence Pack Referenced

Released drawings, material basis, mold approval and closure records are traceable.

Release Check 04 Required Approvals Complete

Product, project, tooling and quality responsibilities have been reviewed as required.

What Should the Final Steel-Cut Authorization Record Contain?

The record does not need to be complicated, but it should make the released basis, unresolved status and authorization decision auditable after machining has started.

Release Field What Should Be Recorded Purpose
Released Product Revision Approved 2D and 3D revision used for the steel-cut review. Prevents machining against superseded product data.
Released Mold Revision Controlled mold-design revision authorized for machining. Identifies the exact tooling definition being released.
Checklist Status Summary PASS, FAIL and OPEN status summary for the 40 release checks. Shows whether release-critical items are fully closed.
Evidence Pack Reference File location, document number or controlled reference for the supporting release evidence. Makes the technical basis for approval retrievable.
OPEN-Item / Deviation Reference Closure record or formally approved deviation reference where applicable. Prevents unresolved issues from disappearing after release.
Authorized Machining Scope The core, cavity, insert or other defined tooling scope covered by this release record. Prevents the approval from being interpreted more broadly than the reviewed machining definition.
Final Decision GO or NO-GO, with decision date and approval reference. Provides the formal authorization status before machining.

Final GO / NO-GO Authorization

The final decision should be recorded only after the applicable release checks, evidence references and approvals have been reviewed against the current revision.

Final Decision — GO Machining is formally authorized

The defined steel-cut scope may proceed because the release-critical checklist items are closed, the supporting evidence is traceable and the required approvals are complete for the recorded revisions.

Final Decision — NO-GO Machining remains on hold

Steel cut is not authorized while a release-critical FAIL, unresolved release-critical OPEN item, missing evidence, unapproved revision or required sign-off remains incomplete.

Final Authorization Record
Final Decision: GO / NO-GO
Authorized Machining Scope
Release Date
Evidence Pack Reference
Open / Deviation Record Reference
Final Release Record No.

With the final release record defined, the checklist can be converted into a reusable project template for future mold programs and formal steel-cut review meetings.

Reusable Steel-Cut Template

Download the 40-Item Before-Steel-Cut Checklist

Use the downloadable checklist as a controlled review record for design-freeze and steel-release meetings. The template should follow the same PASS / FAIL / OPEN item status and GO / NO-GO final-decision logic used throughout this guide.

What the Release Template Should Include

The template is intended to capture the release decision—not to replace the detailed engineering analysis behind individual items.

Template 01 40 Go/No-Go Checks

The complete release checklist grouped by product, CTQ, material, mold-design and authorization areas.

Template 02 PASS / FAIL / OPEN Fields

One clear status for each check, with evidence reference and responsible owner where action remains.

Template 03 OPEN-Item Closure Record

Issue, owner, required action, due date, closure evidence, re-review and final status.

Template 04 Final Steel-Cut Authorization

Released revisions, evidence references, approved machining scope, decision date and GO / NO-GO record.

Need the broader mold-design review template? The steel-cut checklist is the final machining release gate. The complete mold-design checklist covers the wider design-review process before and beyond this single release decision.

Injection Mold Design Checklist →
Before-Steel-Cut FAQ

Frequently Asked Questions About Steel-Cut Release

These questions focus on the final release decision: what should be checked, what evidence should exist, how OPEN items are closed and who should approve machining before injection mold steel is cut.

What should be checked before cutting steel for an injection mold?

Before steel cut, the project should review the released 2D and 3D revision, CTQs and datum references, production resin and shrink basis, mold-design decisions, machining-relevant risks, required evidence, OPEN-item closure and the required project approvals. Each applicable checklist item should have a clear PASS, FAIL or OPEN status before the final GO / NO-GO decision.

What documents are required before injection mold steel cut?

The release package should normally identify the approved 2D and 3D revisions, CTQ and datum references where applicable, the production resin and shrink basis, the released mold-design definition, technical closure records and the final steel-cut authorization. Simulation or other specialist evidence should be included when triggered by project risk or customer requirements rather than treated as universally mandatory.

How should OPEN items be closed before steel release?

Each OPEN item should have a clear issue description, named owner, required action, due date, closure evidence and responsible re-review. A release-critical OPEN item remains a NO-GO condition until it is closed or formally resolved through the approved project process. The final record should show the updated status and closure evidence.

Who should approve the final steel-cut release?

The exact approval structure depends on the organization and project, but the release should normally cover product definition, project coordination, mold-design readiness and quality or measurement requirements. Customer or product engineering, the project engineer or PM, mold design or tooling engineering and quality should approve the responsibilities applicable to the project before final machining authorization.

Engineering Review Need a DFM Review Before Steel Cut?

Send the current 2D drawing, 3D CAD, material requirement and available mold information for an engineering review before machining decisions are locked into steel.

Request a Free DFM Review →

This checklist focuses on the final pre-machining release gate. Detailed DFM analysis, risk scoring, mold-design engineering, simulation, T0/T1 validation, FAI and PPAP are handled in their respective technical processes and project stages.