The Washer,lock, cataloged under National Stock Number 5310-01-671-7645, 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 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-671-7645 |
| Primary Part Number | 12607223-004 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-LEFT HAND |
| Outside Diameter | 14.8 MILLIMETERS MAXIMUM MM |
| Material Thickness | 2.0 MILLIMETERS NOMINAL MM |
| Material | STEEL OVERALL |
| Hole Diameter | 8.1 MILLIMETERS MINIMUM MM |
| 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 |
|---|---|
| 12607223-004 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 40252 PRIMARY | Fastenal Company Div Oshk (USA) |
| Reference | Meaning |
|---|---|
| 12607223-004 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 5310-01-671-7645 is a Washer,lock, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-671-7645 has 2 manufacturer part numbers on file: 12607223-004 (U S Army Tank Automotive Command Amsta-Im-Mm), 40252 (Fastenal Company Div Oshk).
Key specifications for 12607223-004: Style Designator: SPLIT HELICAL-LEFT HAND; Outside Diameter: 14.8 MILLIMETERS MAXIMUM MM; Material Thickness: 2.0 MILLIMETERS NOMINAL MM; Part Name Assigned by Controlling Agency: WASH, LK, SPLIT, METRIC SN TAB. 5 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.