The Washer,flat, cataloged under National Stock Number 5310-01-271-9602, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hiab Usa Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-271-9602 |
| Primary Part Number | 991 4137 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hiab Usa Inc |
| Status | ACTIVE |
| Overall Diameter | 24.0 MILLIMETERS NOMINAL MM |
| Hardness Rating | 200.0 BRINELL MINIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 13.5 MILLIMETERS NOMINAL MM |
| Thickness | 2.0 MILLIMETERS NOMINAL 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 |
|---|---|
| 991 4137 PRIMARY | Hiab Usa Inc (USA) |
| Reference | Meaning |
|---|---|
| 18EM1224 | C/1 Advisory reference — outside the item-of-supply concept Clark Equipment Co |
NSN 5310-01-271-9602 is a Washer,flat, manufactured by Hiab Usa Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-271-9602 has 1 manufacturer part number on file: 991 4137 (Hiab Usa Inc).
Key specifications for 991 4137: Overall Diameter: 24.0 MILLIMETERS NOMINAL MM; Hardness Rating: 200.0 BRINELL MINIMUM; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC OVERALL. 9 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.