Washer, Key5310-00-209-3740

NSN 5310-00-209-3740 · NIIN 002093740 · Part number 6748568

Allison Transmission Inc Dba Allison Transmission, Inc · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 73342

Government record, cited

NSN 5310-00-209-3740 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-209-3740. Manufacturer of record part number: 6748568.

Also searched as 5310-00-209-3740 · 5310002093740 · NIIN 002093740 · 00-209-3740 · FSC 5310 Nuts and Washers · CAGE 73342 · 6748568

Nearby stock numbers ← 5310-00-209-3738 Washer, Key · 5310-00-209-3742 Washer, Key →

5310-00-209-3740 — Nuts and Washers

Features

Washer,key — FSC 5310
Internal Prebent Key Width: 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN
Overall Distance Including Keys: 4.016 INCHES NOMINAL IN
Hardness Rating: 55.0 ROCKWELL B MAXIMUM
Style Designator: KEY
Material Document and Classification: EMS 61100 FSCM 24617 MFR REF SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter: 3.562 INCHES NOMINAL IN
Material Thickness: 0.068 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN

Identification

NSN: 5310-00-209-3740
NIIN: 002093740
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 6748568
Manufacturer: Allison Transmission Inc Dba Allison Transmission, Inc

General Description

The Washer,key, cataloged under National Stock Number 5310-00-209-3740, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-00-209-3740
Primary Part Number	6748568
Item Name	Washer,key
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Allison Transmission Inc Dba Allison Transmission, Inc
Status	ACTIVE
Internal Prebent Key Width	0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN
Overall Distance Including Keys	4.016 INCHES NOMINAL IN
Hardness Rating	55.0 ROCKWELL B MAXIMUM
Style Designator	KEY
Material Document and Classification	EMS 61100 FSCM 24617 MFR REF SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter	3.562 INCHES NOMINAL IN
Material Thickness	0.068 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
External Key Quantity	19
Internal Prebent Key Length	0.188 INCHES NOMINAL IN
Surface Treatment	CADMIUM OVERALL
External Prebent Key Width	0.325 INCHES NOMINAL IN
Material	STEEL OVERALL
Hole Diameter	2.938 INCHES MINIMUM AND 2.945 INCHES MAXIMUM IN

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
6748568 PRIMARY	Allison Transmission Inc Dba Allison Transmission, Inc (USA)
6748568	General Motors Corp (USA)

No interchangeability data on file.

Other items in FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040

5310-00-000-0040 · Item name not on file

5310-00-000-0077

NUT,PLAIN,ROUND

5310-00-000-0079

WASHER,FLAT

5310-00-000-0079

WASHER,FLAT

5310-00-000-1146

5310-00-000-1146 · Item name not on file

5310-00-000-3815

5310-00-000-3815 · Item name not on file

5310-00-000-4532

5310-00-000-4532 · Item name not on file

5310-00-000-4540

5310-00-000-4540 · Item name not on file

Frequently Asked Questions

What is NSN 5310-00-209-3740?

NSN 5310-00-209-3740 is a Washer,key, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-00-209-3740?

NSN 5310-00-209-3740 has 2 manufacturer part numbers on file: 6748568 (Allison Transmission Inc Dba Allison Transmission, Inc), 6748568 (General Motors Corp).

What are the specifications of 6748568?

Key specifications for 6748568: Internal Prebent Key Width: 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN; Overall Distance Including Keys: 4.016 INCHES NOMINAL IN; Hardness Rating: 55.0 ROCKWELL B MAXIMUM; Style Designator: KEY. 13 specifications are documented in the U.S. Government catalog.

Is NSN 5310-00-209-3740 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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