The Washer,flat, cataloged under National Stock Number 5310-01-345-3770, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Kaufman William H Inckaufman Footwear Div. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-345-3770 |
| Primary Part Number | 185-121-021 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Kaufman William H Inckaufman Footwear Div |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES ALL SURFACES |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.180 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.116 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN |
| Thickness | 0.018 INCHES MINIMUM AND 0.024 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 |
|---|---|
| 759-006-115 | Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations (USA) |
| 185-121-021 PRIMARY | Kaufman William H Inckaufman Footwear Div (CAN) |
| Reference | Meaning |
|---|---|
| 759-006-115 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Fluid Systems Division |
NSN 5310-01-345-3770 is a Washer,flat, manufactured by Kaufman William H Inckaufman Footwear Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-345-3770 has 2 manufacturer part numbers on file: 759-006-115 (Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations), 185-121-021 (Kaufman William H Inckaufman Footwear Div).
Key specifications for 185-121-021: Surface Finish: 32.0 MICROINCHES ALL SURFACES; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.180 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 11 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.