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APPROVED VENDOR Key Locking Insert: Thin Wall, 4 Keys, M12x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz - Mil. Spec. Key-Locking Inserts
APPROVED VENDORMil. Spec. Key-Locking Inserts

APPROVED VENDOR Key Locking Insert: Thin Wall, 4 Keys, M12x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz

The APPROVED VENDOR Key Locking Insert is a thin-wall, mil. spec. insert with 4 keys, M12x1.25 internal thread size, M16x1.5 external thread size, plain finish, and coarse thread type. It meets Fed Std. H28/21 and MJ…

SKU 3G-OTH-531702

Brand
APPROVED VENDOR
Item
Key Locking Insert: Thin Wall, 4 Keys, M12x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz
Category
Mil. Spec. Key-Locking Inserts
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Technical Specifications

APPROVED VENDOR
Manufacturer Part Number
217-077556
Type
M12x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz, Plain, 10 PK
Keys
4
Wall Type
Thin Wall
Finish Type
Plain
Thread Type
Coarse
Industry Standards
Fed Std. H28/21, MJ Form
Compatible Tap Size
M16x1.5
External Thread Fit
2A
Internal Thread Fit
3B
Material Grade/Class
18-8
System of Measurement
Metric
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APPROVED VENDOR Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The APPROVED VENDOR Key Locking Insert is a thin-wall, mil. spec. insert with 4 keys, M12x1.25 internal thread size, M16x1.5 external thread size, plain finish, and coarse thread type. It meets Fed Std. H28/21 and MJ Form standards, with a compatible tap size of M16x1.5, external thread fit 2A, internal thread fit 3B, and is made from 18-8 material in metric measurement. Supplied in a 10-pack (MPN 217-077556).

Frequently Asked Questions

What is a key locking insert used for?

A key locking insert, like the APPROVED VENDOR thin-wall type, is used to repair or reinforce internal threads in metal assemblies. It provides a strong, reusable thread in softer materials, meeting mil. spec. standards such as Fed Std. H28/21 and MJ Form for aerospace and defense applications.

What are the specifications of the APPROVED VENDOR key locking insert?

This thin-wall insert has M12x1.25 internal thread and M16x1.5 external thread, with 4 keys and a plain finish. It is made from 18-8 stainless steel, meets Fed Std. H28/21 and MJ Form standards, and has external thread fit 2A and internal thread fit 3B. Supplied in a 10-pack (MPN 217-077556).

Where to buy APPROVED VENDOR key locking inserts worldwide?

3G Electric supplies APPROVED VENDOR key locking inserts worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver these mil. spec. inserts to your facility. Contact us for pricing and lead time on the 10-pack (MPN 217-077556).

How to install a key locking insert?

To install a key locking insert, drill and tap the hole to the compatible tap size (M16x1.5 for this insert). Use a proper installation tool to thread the insert into the hole, then drive the keys down into the parent material to lock it in place. Follow mil. spec. guidelines for torque and depth.

Used in

Common applications for APPROVED VENDOR
Laboratory sampling — APPROVED VENDOR clear wide mouth glass bottles for collecting and storing liquid samples in non-sterile environments.
Steam heating maintenance — APPROVED VENDOR forged brass radiator valves for regulating steam flow in commercial building heating systems.
High-pressure cleaning — APPROVED VENDOR turbo spray nozzles for pressure washers used in industrial equipment cleaning up to 6,000 psi.
Cleanroom operations — APPROVED VENDOR vinyl task chairs for seating in ISO 5 classified manufacturing or assembly areas.
General sealing — APPROVED VENDOR natural rubber stoppers for closing laboratory flasks or test tubes in educational or research settings.
Tamper-evident security — APPROVED VENDOR brass lead and wire seals for securing utility meters, cargo containers, or access panels.

APPROVED VENDOR Products

3G Electric supplies APPROVED VENDOR mil. spec. key-locking inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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