The Washer,recessed, cataloged under National Stock Number 5310-01-250-6306, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rockwell Collins, Inc. Dba Rc Displays Systems. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-250-6306 |
| Primary Part Number | 37288-1 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rockwell Collins, Inc. Dba Rc Displays Systems |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35,TYPE 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| Material Thickness | 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN |
| Recess Diameter | 0.450 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 440C OVERALL |
| Hole Diameter | 0.385 INCHES MINIMUM AND 0.392 INCHES MAXIMUM IN |
| Recess Angle | 100.0 DEGREES NOMINAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5310-01-250-6306 is a Washer,recessed, manufactured by Rockwell Collins, Inc. Dba Rc Displays Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-250-6306 has 2 manufacturer part numbers on file: 37288-1 (Rockwell Collins, Inc. Dba Rc Displays Systems), 37288-1 (Wess-Del Incorporated Dba Wess-Del Inc).
Key specifications for 37288-1: Surface Treatment Document and Classification: QQ-P-35,TYPE 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM; Style Designator: RECESSED; Material Document and Classification: QQ-S-763,COND A 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.