The Washer,flat, cataloged under National Stock Number 5310-01-131-5498, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-131-5498 |
| Primary Part Number | 74A550691-2001 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing |
| Status | ACTIVE |
| Overall Diameter | 1.375 INCHES NOMINAL IN |
| Material Document and Classification | AMS 6414 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4340 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.765 INCHES NOMINAL IN |
| Thickness | 0.125 INCHES NOMINAL 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 |
|---|---|
| 74A550691-2001 PRIMARY | Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 74A550691-2001 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 74A550691-2001 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 74A550691-2001 | 5/9 Secondary reference Alco Machine Co Inc |
NSN 5310-01-131-5498 is a Washer,flat, manufactured by Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-131-5498 has 1 manufacturer part number on file: 74A550691-2001 (Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing).
Key specifications for 74A550691-2001: Overall Diameter: 1.375 INCHES NOMINAL IN; Material Document and Classification: AMS 6414 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.