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, 4 Keys, #10-32 Int Thrd Sz, 5/16"-18 Ext Thrd Sz - Mil. Spec. Key-Locking Inserts
APPROVED VENDORMil. Spec. Key-Locking Inserts

APPROVED VENDOR Key Locking Insert: Thin Wall, 4 Keys, #10-32 Int Thrd Sz, 5/16"-18 Ext Thrd Sz

The APPROVED VENDOR Key Locking Insert is a thin-wall, inch-system Mil. Spec. insert with a #10-32 internal thread size and a 5/16"-18 external thread size. It features 4 keys, a plain finish, and is made from 18-8…

SKU 3G-OTH-531626

Brand
APPROVED VENDOR
Item
Key Locking Insert: Thin Wall, 4 Keys, #10-32 Int Thrd Sz, 5/16"-18 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
217-076521
Type
#10-32 Int Thrd Sz, Plain, Plain, 10 PK
Keys
4
Wall Type
Thin Wall
Ext Thrd Sz
5/16"-18
Finish Type
Plain
Thread Type
Coarse
Industry Standards
MS51831-106
Compatible Tap Size
5/16"-18
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, inch-system Mil. Spec. insert with a #10-32 internal thread size and a 5/16"-18 external thread size. It features 4 keys, a plain finish, and is made from 18-8 material, meeting MS51831-106 standards. Supplied in a 10-pack, this insert has a 2A external thread fit and a 3B internal thread fit, with a compatible tap size of 5/16"-18.

Frequently Asked Questions

What is an APPROVED VENDOR key locking insert used for?

This thin-wall key locking insert is used to repair or reinforce threaded holes in metal assemblies, particularly in aerospace and defense applications. It meets Mil. Spec. MS51831-106 for reliable thread restoration in 18-8 stainless steel, with 4 keys to prevent rotation under load.

What are the specifications of the APPROVED VENDOR 217-076521 key locking insert?

This insert has a #10-32 internal thread size and a 5/16"-18 external thread size, with a thin wall design. It features 4 keys, a plain finish, 2A external thread fit, 3B internal thread fit, and is made from 18-8 stainless steel. Supplied in a 10-pack, it meets MS51831-106 standards.

Where to buy APPROVED VENDOR key locking inserts worldwide?

3G Electric supplies APPROVED VENDOR key locking inserts worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner, we provide these Mil. Spec. inserts to industrial and defense customers, ensuring compliance with MS51831-106 standards.

How to install a thin-wall key locking insert?

Installation requires tapping the hole to the compatible tap size (5/16"-18), then driving the insert using a key locking tool until it is flush. The 4 keys lock into the parent material to prevent loosening. Always follow the manufacturer's torque and depth guidelines for 18-8 stainless steel inserts.

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: Extra Heavy Wall, 2 Keys, #8-32 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, Plain, 10 PK (MPN 217-077332). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 3/8"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 303; Industry Standards: MIL-I-45914A (MS51832); System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Extra Heavy Wall, 2 Keys, #8-32 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, Plain, 10 PK (MPN 217-077332). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 3/8"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 303; Industry Standards: MIL-I-45914A (MS51832); System of Measurement: Inch.
Key Locking Insert: Thin Wall, 4 Keys, 1/4"-20 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076322). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 3/8"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51831-101; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Thin Wall, 4 Keys, 1/4"-20 Int Thrd Sz, 3/8"-16 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076322). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 3/8"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51831-101; System of Measurement: Inch.
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1/2"-13 Int Thrd Sz, 13/16"-16 Ext Thrd Sz, 10 PK (MPN 217-077338). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 13/16"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: NAS1394C3L; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1/2"-13 Int Thrd Sz, 13/16"-16 Ext Thrd Sz, 10 PK (MPN 217-077338). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 13/16"-16; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: NAS1394C3L; System of Measurement: Inch.
Key Locking Insert: Heavy Wall, 4 Keys, M5x0.8 Int Thrd Sz, M10x1.25 Ext Thrd Sz, Plain, 10 PK (MPN 217-076364). Key specifications — Wall Type: Heavy 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: Heavy Wall, 4 Keys, M5x0.8 Int Thrd Sz, M10x1.25 Ext Thrd Sz, Plain, 10 PK (MPN 217-076364). Key specifications — Wall Type: Heavy 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: Thin Wall, 4 Keys, 5/16"-24 Int Thrd Sz, 7/16"-14 Ext Thrd Sz, Plain, 10 PK (MPN 217-077523). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 7/16"-14; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-107; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Thin Wall, 4 Keys, 5/16"-24 Int Thrd Sz, 7/16"-14 Ext Thrd Sz, Plain, 10 PK (MPN 217-077523). Key specifications — Wall Type: Thin Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 7/16"-14; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-107; System of Measurement: Inch.
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1"-8 Int Thrd Sz, 1 1/2"-12 Ext Thrd Sz, Plain, 10 PK (MPN 217-076343). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-1/2"-12; Drill Bit Size: 1-27/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-106L.
APPROVED VENDOR
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1"-8 Int Thrd Sz, 1 1/2"-12 Ext Thrd Sz, Plain, 10 PK (MPN 217-076343). Key specifications — Wall Type: Extra Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 1-1/2"-12; Drill Bit Size: 1-27/64 in; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-106L.
Key Locking Insert: Heavy Wall, 4 Keys, #8-32 Int Thrd Sz, 5/16"-18 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076300). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 5/16"-18; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-111; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Heavy Wall, 4 Keys, #8-32 Int Thrd Sz, 5/16"-18 Ext Thrd Sz, Plain, Plain, 10 PK (MPN 217-076300). Key specifications — Wall Type: Heavy Wall; Brand: APPROVED VENDOR; Compatible Tap Size: 5/16"-18; External Thread Fit: 2A; Internal Thread Fit: 3B; Material Grade/Class: 18-8; Industry Standards: MS51832-111; System of Measurement: Inch.
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1/4"-20 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, Plain, 10 PK (MPN 217-077534). Key specifications — Wall Type: Extra 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: MS51832-202L; System of Measurement: Inch.
APPROVED VENDOR
Key Locking Insert: Extra Heavy Wall, 4 Keys, 1/4"-20 Int Thrd Sz, 1/2"-13 Ext Thrd Sz, Plain, 10 PK (MPN 217-077534). Key specifications — Wall Type: Extra 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: MS51832-202L; System of Measurement: Inch.