Door Hardware Pre-Drill and Lock Bore Inspection
Inspect machined door slabs and frames before hardware installation to catch bore, mortise, and strike prep errors early. Use it to prevent fit failures, rework, and release only parts that match the hardware schedule.
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Overview
This template is for inspecting machined door slabs and frames before locksets, hinges, and strikes are installed. It walks the inspector through setup and traceability, lock bore and edge prep dimensions, hinge mortise quality, strike prep and frame alignment, and final fit verification so dimensional errors are caught before they become installation rework.
Use it when you need to confirm that the part matches the shop drawing, hardware schedule, and specified prep dimensions. It is a good fit for first-article checks, pre-shipment release, and any run where a setup change, tool wear, or mixed hardware package could create a mismatch. The template helps document non-conformances clearly, including whether the issue is a dimensional miss, a tear-out defect, or a fit interference that prevents release.
Do not use this as a substitute for field installation inspection, fire-door labeling review, or a general receiving inspection. It is also not the right form for finished doors that are already hung and trimmed in place. The value here is in verifying the machined prep while there is still time to correct the part in the shop, before hardware is mounted and the defect becomes more expensive to fix.
Standards & compliance context
- This template supports ISO 9001-style control of inspection records, traceability, and non-conformance handling for machined components.
- For fire-rated or life-safety doors and frames, verify the prep against the applicable NFPA code requirements, the listing instructions, and the AHJ's expectations before release.
- If the project uses manufacturer-specific hardware, the inspection should follow the published prep templates and installation instructions for that hardware family.
- Where the door assembly is part of a regulated building or occupancy type, document the inspection as a quality control step rather than a substitute for code compliance review.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Setup and Traceability
This section matters because correct identification and measurement tools are the foundation for a defensible inspection result.
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Door or frame identifier matches shop drawing / hardware schedule
Record the unique identifier, opening number, or part number and confirm it matches the approved drawing or hardware schedule.
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Inspection tools verified and suitable for measurement
Confirm required tools are available and appropriate for the measured features, such as calipers, tape, bore gauge, depth gauge, and square.
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Reference document available at point of use
Enter the drawing revision, hardware template, or SOP used for this inspection.
Lock Bore and Edge Prep Dimensions
This section matters because lock fit failures usually start with a bore, backset, or alignment error that is visible before installation.
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Lock bore diameter within specified tolerance
Measure the main lock bore diameter and compare it to the approved hardware preparation requirement.
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Backset dimension matches specified hardware prep
Measure from the door edge to the bore centerline and verify it matches the required backset.
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Cross-bore and edge-bore alignment is centered and square
Verify the bore centerline is aligned to the door edge and the prep is not visibly out of square or offset.
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Edge bore diameter and depth match hardware requirements
Measure the latch edge bore diameter and depth against the specified hardware prep.
Hinge Mortise and Door Edge Preparation
This section matters because hinge location and edge quality determine whether the door will hang correctly and avoid binding or breakout.
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Hinge mortise location matches specified setback
Measure hinge location from the top or bottom of the door and verify it matches the approved layout.
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Hinge mortise depth and width are correct
Measure mortise depth and width to confirm the hinge leaf seats flush without overcut or proud condition.
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Door edge is free of tear-out, splintering, or breakout at prep locations
Inspect all machined prep areas for damage that would affect hardware fit or finish.
Strike Prep and Frame Alignment
This section matters because a clean strike prep and aligned frame opening are essential for latch engagement and flush hardware seating.
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Strike prep location matches frame layout
Measure the strike cutout location and verify it aligns with the latch centerline and approved frame prep.
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Strike opening dimensions match specified hardware
Measure strike opening width, height, and depth as applicable for the installed hardware set.
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Frame prep is clean, square, and free of obstruction
Verify the frame cutout is free of burrs, debris, deformation, or interference that would prevent proper strike installation.
Fit Verification and Disposition
This section matters because the final trial fit and release decision prevent non-conforming parts from moving downstream.
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Trial fit confirms hardware seats without interference
Perform a dry fit or template check where applicable to confirm the lockset, latch, hinges, and strike can be installed without binding.
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All dimensional non-conformances documented
Record any deficiency, measured deviation, and disposition such as rework, hold, or accept-as-is with approval.
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Inspector approval for release to installation
Inspector signs to confirm the door or frame prep is acceptable for release.
How to use this template
- Start by confirming the door or frame identifier against the shop drawing, hardware schedule, and revision level, then verify the measuring tools are calibrated and appropriate for the prep being checked.
- Measure the lock bore, backset, cross-bore alignment, and edge bore dimensions against the specified hardware prep, and record any out-of-tolerance condition as a non-conformance.
- Inspect the hinge mortise location, depth, and width, then check the door edge for tear-out, splintering, breakout, or other machining damage at each prep location.
- Verify the strike prep location and opening dimensions on the frame, and confirm the frame surface is clean, square, and free of obstructions that would interfere with hardware seating.
- Perform a trial fit with the intended hardware or a verified gauge where appropriate, then document whether the part seats without interference and whether it is approved, held, or rejected.
- Review all findings with the responsible lead, assign corrective action for any defect, and release only the parts that meet the specified dimensions and fit requirements.
Best practices
- Measure from the same reference edge and datum called out on the shop drawing so backset and mortise location are not judged from inconsistent points.
- Use go/no-go gauges or calipers that match the required tolerance band instead of estimating fit by eye.
- Photograph every dimensional defect and every tear-out condition at the time of inspection so the rework team can see the exact failure mode.
- Separate critical fit items from cosmetic defects in your notes so release decisions stay tied to installation risk, not appearance alone.
- Recheck the first piece immediately after any tool change, bit replacement, or machine setup adjustment.
- Confirm the hardware schedule revision before measuring, because a correct prep for the wrong hardware set still becomes a non-conformance.
- Treat strike prep obstruction, burrs, and breakout as functional defects when they can prevent latch engagement or proper seating.
- Record the disposition clearly as approved, rework, or reject so the part does not move downstream without a decision.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this inspection template cover?
This template covers the pre-installation verification of door lock bores, backset, cross-bore and edge-bore alignment, hinge mortise location and depth, strike prep, and frame alignment. It is designed for machined door slabs and frames before hardware is installed. The final section also records trial fit results and release disposition so non-conformances do not move downstream.
When should this inspection be used?
Use it after machining and before hardware installation, finishing, or shipment to the jobsite. It is especially useful when multiple door types, hardware sets, or frame conditions are being produced in the same run. If the part is already fully installed, this template is less useful than a field punch-list or installation verification form.
Who should complete the inspection?
A trained quality inspector, shop lead, or competent person familiar with the hardware schedule and machining tolerances should run it. The person completing it should be able to read shop drawings, verify measurements, and judge whether a prep is square, clean, and within tolerance. Final release should be signed by someone authorized to accept or reject the part.
Does this template map to any regulatory or standards framework?
This is primarily a quality inspection template, so it aligns most closely with ISO 9001-style non-conformance control and traceability practices. If the doors are part of a life-safety assembly, the inspection also supports NFPA-related fit and installation expectations and the Authority Having Jurisdiction's review requirements. It does not replace manufacturer instructions or project specifications.
What are the most common mistakes this inspection catches?
Common issues include the wrong backset, a lock bore that is off-center or out of square, hinge mortises cut too deep or in the wrong location, and strike openings that do not match the frame layout. Inspectors also frequently find tear-out at the door edge, burrs or splintering around the prep, and frames with obstruction that prevents a clean trial fit. These are the kinds of defects that cause hardware to bind or sit proud during installation.
How often should this inspection be performed?
It should be performed on every machined door slab and frame lot before release, not just on sampled pieces, unless your quality plan explicitly allows sampling. For high-volume runs, you may use in-process checks and a final verification step, but the release decision should still be tied to the actual part being shipped. If a setup changes, recheck the first piece immediately.
Can this template be customized for different hardware sets?
Yes. You can add fields for cylindrical locks, mortise locks, exit devices, closers, or specialty hinges, and you can tailor the tolerance fields to the hardware schedule or manufacturer template. The structure is flexible enough to support different door materials, handedness, and frame types without changing the core inspection flow.
How does this compare with an ad-hoc shop check?
An ad-hoc check often relies on memory and informal judgment, which makes it easy to miss a mislocated bore or a frame prep issue until installation. This template creates a repeatable record of what was measured, what was found, and whether the part was approved or held. That makes rework faster to trace and reduces the chance of sending a non-conforming door to the field.
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