The Washer,key, cataloged under National Stock Number 5310-00-753-9581, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-753-9581 |
| Primary Part Number | 7539581 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.208 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN |
| Split Key Length | 0.101 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.085 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 0.520 INCHES MINIMUM AND 0.525 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.350 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Material Thickness | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| External Key Quantity | 3 |
| External Prebent Key Angle | 30.0 DEGREES NOMINAL |
| Surface Treatment | ZINC OR DICHROMATE OVERALL |
| External Prebent Key Width | 0.094 INCHES NOMINAL IN |
| Material | STEEL COMP 1010 OVERALL |
| Angle Between External Keys | 36.0 DEGREES NOMINAL |
| Hole Diameter | 0.192 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7539581 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 880G1 | 5/9 Secondary reference Diamond Reo Truck Co |
| 4042810 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 860750 | 5/9 Secondary reference Clark Equipment Co |
| 1915009 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
| 860750 | 3/2 Design control — primary reference U.S. Government activity |
| 637412 | C/1 Advisory reference — outside the item-of-supply concept Mitsubishi Caterpillar Forklift America, Inc |
| 1915009 | C/1 Advisory reference — outside the item-of-supply concept Borgwarner Pds (anderson), L.l.c. |
| 1915009 | 5/9 Secondary reference General Motors Corp |
| 1915009 | 5/9 Secondary reference General Motors Corp Delco Remy Div |
NSN 5310-00-753-9581 is a Washer,key, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-753-9581 has 1 manufacturer part number on file: 7539581 (U S Army Tank Automotive Command Amsta-Im-Mm).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-334-3537, 5305-01-359-9357. Verify interchangeability with system specifications before substitution.
Key specifications for 7539581: Distance From Centerline to Inside of Prebent Key: 0.208 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN; Split Key Length: 0.101 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN; External Prebent Key Length: 0.085 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN; Overall Distance Including Keys: 0.520 INCHES MINIMUM AND 0.525 INCHES MAXIMUM IN. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.