Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
APPROVED VENDOR Key Locking Insert: Thin Wall, 2 Keys, #2-56 Int Thrd Sz, #8-32 Ext Thrd Sz - Mil. Spec. Key-Locking Inserts
APPROVED VENDORMil. Spec. Key-Locking Inserts

APPROVED VENDOR Key Locking Insert: Thin Wall, 2 Keys, #2-56 Int Thrd Sz, #8-32 Ext Thrd Sz

The APPROVED VENDOR Key Locking Insert is a thin-wall, mil-spec insert (MS51830-105) with 2 keys, #2-56 internal thread size, and #8-32 external thread size in 18-8 stainless steel. Supplied as a 10-pack with coarse…

SKU 3G-OTH-531615

Brand
APPROVED VENDOR
Item
Key Locking Insert: Thin Wall, 2 Keys, #2-56 Int Thrd Sz, #8-32 Ext Thrd Sz
Category
Mil. Spec. Key-Locking Inserts
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

APPROVED VENDOR
Manufacturer Part Number
217-077283
Type
#2-56 Int Thrd Sz, #8-32 Ext Thrd Sz, Stainless Steel, 10 PK
Keys
2
Wall Type
Thin Wall
Finish Type
Plain
Thread Type
Coarse
Industry Standards
MS51830-105
Compatible Tap Size
#8-32
External Thread Fit
2A
Internal Thread Fit
3B
Material Grade/Class
18-8
System of Measurement
Inch
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

APPROVED VENDOR Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The APPROVED VENDOR Key Locking Insert is a thin-wall, mil-spec insert (MS51830-105) with 2 keys, #2-56 internal thread size, and #8-32 external thread size in 18-8 stainless steel. Supplied as a 10-pack with coarse threads, plain finish, and inch-system dimensions, it features a #8-32 compatible tap size with 2A external and 3B internal thread fits.

Frequently Asked Questions

What is a key locking insert used for?

A key locking insert, like the APPROVED VENDOR thin-wall MS51830-105 type, is used to repair or reinforce tapped threads in metal assemblies. The two external keys lock the insert into the parent material, preventing rotation under vibration or load, making it ideal for aerospace, military, and industrial applications.

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

This thin-wall insert has a #2-56 internal thread size and #8-32 external thread size, with 2A external and 3B internal thread fits. It is made of 18-8 stainless steel, has a plain finish, coarse threads, and meets MS51830-105. Supplied as a 10-pack with inch-system dimensions.

Where to buy APPROVED VENDOR key locking inserts worldwide?

3G Electric supplies the APPROVED VENDOR key locking insert (MPN 217-077283) to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this mil-spec insert.

How to install a thin-wall key locking insert?

Installation requires drilling the hole to the specified tap size (#8-32), tapping threads, then using a driver tool to insert the locking insert until the keys engage. Ensure the insert is flush or slightly below the surface. Use a tang break-off tool if applicable. Follow MS51830-105 guidelines for best results.

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from APPROVED VENDOR

View all APPROVED VENDOR parts →
Key Locking Insert: Thin Wall, 4 Keys, M10x1.5 Int Thrd Sz, M14x1.5 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-077355). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M14x1.5; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
APPROVED VENDOR
Key Locking Insert: Thin Wall, 4 Keys, M10x1.5 Int Thrd Sz, M14x1.5 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-077355). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M14x1.5; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
Key Locking Insert: Thin Wall, 2 Keys, #4-40 Int Thrd Sz, #10-32 Ext Thrd Sz, Stainless Steel, 10 PK (MPN 217-076284). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: #10-32; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51830-102; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Thin Wall, 2 Keys, #4-40 Int Thrd Sz, #10-32 Ext Thrd Sz, Stainless Steel, 10 PK (MPN 217-076284). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: #10-32; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51830-102; System of Measurement: Inch.
Key Locking Insert: Thin Wall, 4 Keys, M6-1.00 Int Thrd Sz, M10x1.25 Ext Thrd Sz, Plain, 10 PK (MPN 217-076352). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M10x1.25; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
APPROVED VENDOR
Key Locking Insert: Thin Wall, 4 Keys, M6-1.00 Int Thrd Sz, M10x1.25 Ext Thrd Sz, Plain, 10 PK (MPN 217-076352). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M10x1.25; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
Key Locking Insert: Heavy Wall, 4 Keys, M10x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz, Plain, 10 PK (MPN 217-077567). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M16x1.5; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
APPROVED VENDOR
Key Locking Insert: Heavy Wall, 4 Keys, M10x1.25 Int Thrd Sz, M16x1.5 Ext Thrd Sz, Plain, 10 PK (MPN 217-077567). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M16x1.5; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: Fed Std. H28/21, MJ Form; System of Measurement: Metric.
Key Locking Insert: Heavy Wall, 4 Keys, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, Plain, 10 PK (MPN 217-077303). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1/2"-13; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-209; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Heavy Wall, 4 Keys, 5/16"-18 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, Plain, 10 PK (MPN 217-077303). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1/2"-13; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-209; System of Measurement: Inch.
Key Locking Insert: Heavy Wall, 4 Keys, M20-2.50 Int Thrd Sz, M30-2.00 Ext Thrd Sz, Plain, 10 PK (MPN 217-077373). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M30-2.00; Drill Bit Size: 28.10 mm; External Thread Fit: 2A; External Thread Size: M30-2.00; Internal Thread Fit: 3B; Material Grade/Class: 18-8.
APPROVED VENDOR
Key Locking Insert: Heavy Wall, 4 Keys, M20-2.50 Int Thrd Sz, M30-2.00 Ext Thrd Sz, Plain, 10 PK (MPN 217-077373). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: M30-2.00; Drill Bit Size: 28.10 mm; External Thread Fit: 2A; External Thread Size: M30-2.00; Internal Thread Fit: 3B; Material Grade/Class: 18-8.
Key Locking Insert: Extra Heavy Wall, 4 Keys, 3/4"-16 Int Thrd Sz, 1 1/4"-12 Ext Thrd Sz, 10 PK (MPN 217-077541). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-1/4"-12; Drill Bit Size: 1-11/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-209L.
APPROVED VENDOR
Key Locking Insert: Extra Heavy Wall, 4 Keys, 3/4"-16 Int Thrd Sz, 1 1/4"-12 Ext Thrd Sz, 10 PK (MPN 217-077541). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-1/4"-12; Drill Bit Size: 1-11/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-209L.
Key Locking Insert: Heavy Wall, 4 Keys, 1"-8 Int Thrd Sz, 1 3/8"-12 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076311). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-3/8"-12; Drill Bit Size: 1-19/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51831-211.
APPROVED VENDOR
Key Locking Insert: Heavy Wall, 4 Keys, 1"-8 Int Thrd Sz, 1 3/8"-12 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076311). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-3/8"-12; Drill Bit Size: 1-19/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51831-211.