Anti-rotation structure
The keys create mechanical restraint between the insert and parent material.
KEY-LOCKING INSERT
Key-Locking Inserts
Let mechanical keys resist rotation.
After the solid insert is screwed into position, its pre-installed keys are driven into the parent material to secure it mechanically.
DESIGNED FOR CONNECTION
Screwing it in is the first step. The keys secure it.
Key-locking inserts have internal and external threads. The outer thread engages the parent material and the inner thread accepts the screw. The keys are driven after positioning. Key quantity and installation requirements depend on the model; dimensions and load capacity cannot be inferred from appearance.
Solid connection interface
The internal and external threads perform different connection tasks.
Assess repair suitability
Evaluate for repairs with sufficient installation space.
01 / STRUCTURE
Start with the right structure.
The insert structure determines how key-locking inserts connect and install.
Standard type
A solid body and locking keys form a mechanical anchor.
Locking type
Specify internal screw locking in addition to external key locking.
Custom type
Confirm outside diameter, number of keys and length against the drawing.
Related product:Explore the related product →
02 / MATERIAL
Match the material to the conditions.
These material options are discussion points; not every model is available in every combination.
Stainless steel
Confirm grade, strength and corrosion resistance against the supply drawing.
Other materials
Discuss the parent material, environment and connection loads.
Material documentation
Specify the material standard and required inspection documents in the order.
03 / SURFACE
The finish is part of the connection.
Consider friction, corrosion resistance and identification in the operating environment. Confirm available combinations with an engineer.
Surface condition
Confirm whether lubrication, protection or another treatment is needed.
Mating compatibility
Check the combination of parent material, screw, media and surface treatments.
Made to drawing
Include treatment type and thickness in dimensional and acceptance requirements.
INSTALLATION
From preparation to final inspection.
Prepare the installation hole
Drill and tap for the external thread and inspect the entry.
Install the insert
Position the insert at the specified installation depth.
Drive the locking keys
Use the specified tool to drive the keys according to the approved process.
Inspect retention
Inspect key position, internal thread and surrounding material.
Actual dimensions, tools and processes are subject to the approved product drawing and technical agreement.
CONFIGURATION
Bring your requirements to our engineers.
Choose a preferred configuration and add thread size and operating conditions. This is an engineering enquiry, not a confirmed supply configuration.
Confirm these details for a clearer discussion.
Space and edge distance
Insert outside diameter, hole depth and surrounding material allowance.
Parent-material conditions
Specify material, hardness and any required pretreatment.
Key structure
Confirm key quantity, dimensions and installation tools.
Internal thread type
Distinguish free-running internal threads from screw-locking types.
KEY-LOCKING INSERTS · DRILL & TAP
Key-locking insert drill & tap data.
Choose the lightweight or heavy-duty series, then match the internal thread, external thread and installation hole.
Metric reference edition: 28 installation combinations. Standard and locking versions share the listed installation fields. Compatibility with ZCOIL products is unverified; approved drawings govern machining. Not for wire inserts.
Metric lightweight mm · Standard / locking
The tap matches the external thread, class 6H. Listed depth is minimum tapping depth, not total drilling depth.
Download CSV (opens in Excel) ↓| Internal thread | External thread | Length L +/-0.3 | Tap drill Ø | Countersink Ø +0.25/-0.00 | Installation tap 6H | Min tapping depth |
|---|---|---|---|---|---|---|
| M5X0.8 | M8X1.25 | 8.0 | 6.9 | 8.25 | M8X1.25 | 9.5 |
| M6X1.0 | M10X1.25 | 10.0 | 8.8 | 10.25 | M10X1.25 | 11.5 |
| M8X1.25 | M12X1.25 | 12.0 | 10.8 | 12.25 | M12X1.25 | 13.5 |
| M8X1.0 | M12X1.25 | 12.0 | 10.8 | 12.25 | M12X1.25 | 13.5 |
| M10X1.5 | M14X1.5 | 14.0 | 12.8 | 14.25 | M14X1.5 | 15.5 |
| M10X1.25 | M14X1.5 | 14.0 | 12.8 | 14.25 | M14X1.5 | 15.5 |
| M12X1.75 | M16X1.5 | 16.0 | 14.75 | 16.25 | M16X1.5 | 17.5 |
| M12X1.25 | M16X1.5 | 16.0 | 14.75 | 16.25 | M16X1.5 | 17.5 |
Metric heavy-duty mm · Standard / locking
The tap matches the external thread, class 6H. Listed depth is minimum tapping depth, not total drilling depth.
Download CSV (opens in Excel) ↓| Internal thread | External thread | Length L +/-0.3 | Tap drill Ø | Countersink Ø +0.25/-0.00 | Installation tap 6H | Min tapping depth |
|---|---|---|---|---|---|---|
| M4X0.7 | M8X1.25 | 8.0 | 6.9 | 8.25 | M8X1.25 | 9.5 |
| M5X0.8 | M10X1.25 | 10.0 | 8.8 | 10.25 | M10X1.25 | 12.5 |
| M6X1.0 | M12X1.25 | 12.0 | 10.8 | 12.25 | M12X1.25 | 14.5 |
| M8X1.25 | M14X1.5 | 14.0 | 12.8 | 14.25 | M14X1.5 | 16.5 |
| M8X1.0 | M14X1.5 | 14.0 | 12.8 | 14.25 | M14X1.5 | 16.5 |
| M10X1.5 | M16X1.5 | 16.0 | 14.75 | 16.25 | M16X1.5 | 18.5 |
| M10X1.25 | M16X1.5 | 16.0 | 14.75 | 16.25 | M16X1.5 | 18.5 |
| M12X1.75 | M18X1.5 | 18.0 | 16.75 | 18.25 | M18X1.5 | 20.5 |
| M12X1.5 | M18X1.5 | 18.0 | 16.75 | 18.25 | M18X1.5 | 20.5 |
| M12X1.25 | M18X1.5 | 18.0 | 16.75 | 18.25 | M18X1.5 | 20.5 |
| M14X2.0 | M20X1.5 | 20.0 | 18.75 | 20.25 | M20X1.5 | 22.5 |
| M14X1.5 | M20X1.5 | 20.0 | 18.75 | 20.25 | M20X1.5 | 22.5 |
| M16X2.0 | M22X1.5 | 22.0 | 20.50 | 22.25 | M22X1.5 | 24.5 |
| M16X1.5 | M22X1.5 | 22.0 | 20.50 | 22.25 | M22X1.5 | 24.5 |
| M18X1.5 | M24X1.5 | 24.0 | 22.50 | 24.25 | M24X1.5 | 26.5 |
| M20X2.5 | M30X2.0 | 30.0 | 28.00 | 30.25 | M30X2.0 | 34.5 |
| M20X1.5 | M30X2.0 | 30.0 | 28.00 | 30.25 | M30X2.0 | 34.5 |
| M22X1.5 | M32X2.0 | 32.0 | 30.00 | 32.25 | M32X2.0 | 36.5 |
| M24X3.0 | M33X2.0 | 33.0 | 31.00 | 33.25 | M33X2.0 | 37.5 |
| M24X2.0 | M33X2.0 | 33.0 | 31.00 | 33.25 | M33X2.0 | 37.5 |
Reading notes and applicability
- Metric key-locking insert installation references, in mm. Lightweight and heavy-duty series are separate: the same internal thread may need different external threads and hole sizes.
- The installation tap matches the external thread; the tapped hole is class 6H. Do not use wire-insert STI data or tap to the insert internal thread. Confirm the insert, material, tooling and drawing.
- L tolerance: +/-0.3 mm. Countersink diameter: +0.25 / -0.00 mm. Minimum tapping depth is not total drilling depth. Allow separately for drill point, tap lead and blind-hole clearance; drill tolerance and countersink angle follow the approved drawing.
- Standard and locking variants share the listed installation fields in the source, so these fields are combined. Locking geometry, locking-zone length, load and torque are excluded; interchangeability is not implied.
- Coverage: 8 lightweight and 20 heavy-duty metric combinations. Unlisted sizes, inch series and other families are not extrapolated. Listed dimensions do not establish ZCOIL supply availability.
- Installation drilling and removal drilling serve different purposes. Only installation fields are included here. Confirm key-slot preparation and installation requirements for hard parent materials.
- ZC-KL-20261001-R1. Reorganized from a public official catalogue. ZCOIL product compatibility is not verified. Approved drawings govern machining.
ZC-KL-20261001-R1 · Dimensions in mm · unlisted sizes are not extrapolated
KNOWLEDGE & RESOURCES
Explore further.
Frequently asked questions
Do locking keys necessarily lock the screw?
Keys primarily secure the insert to the parent material. Screw locking depends on whether the internal thread is a locking type.
Why is the parent material's hardness needed?
Parent-material condition affects key installation. The same pressing force or process is not suitable for every material.