The Washer,shouldered, cataloged under National Stock Number 5310-00-926-5891, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Avionics Specialties, Inc.. Government technical data includes 8 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-926-5891 |
| Primary Part Number | 104B438 |
| Item Name | Washer,shouldered |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Avionics Specialties, Inc. |
| Status | ACTIVE |
| Shoulder Height | 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Style Designator | SHOULDERED |
| Material Document and Classification | ZZ-R-765,CLASS 2,GRADE 60 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN |
| Material Thickness | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.518 INCHES MINIMUM AND 0.528 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC OVERALL |
| Hole Diameter | 0.437 INCHES MINIMUM AND 0.447 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 |
NSN 5310-00-926-5891 is a Washer,shouldered, manufactured by Avionics Specialties, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-926-5891 has 2 manufacturer part numbers on file: 104-438 (Avionics Specialties, Inc.), 104B438 (Avionics Specialties, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 1240-01-574-0447. Verify interchangeability with system specifications before substitution.
Key specifications for 104B438: Shoulder Height: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN; Style Designator: SHOULDERED; Material Document and Classification: ZZ-R-765,CLASS 2,GRADE 60 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN. 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.