The Washer,flat, cataloged under National Stock Number 5310-00-193-9705, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Siemens Energy, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-193-9705 |
| Primary Part Number | B1141A1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Overall Diameter | 0.438 INCHES NOMINAL IN |
| Material Document and Classification | QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.312 INCHES NOMINAL IN |
| Thickness | 0.062 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 |
|---|---|
| B1141A1 PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| B1141-1 | 3/9 Design control — primary reference Somerset Engineering Div Midland-Ross Corp |
| B1141A1 | 5/9 Secondary reference Somerset Engineering Div Midland-Ross Corp |
NSN 5310-00-193-9705 is a Washer,flat, manufactured by Siemens Energy, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-193-9705 has 1 manufacturer part number on file: B1141A1 (Siemens Energy, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5905-00-611-2107. Verify interchangeability with system specifications before substitution.
Key specifications for B1141A1: Overall Diameter: 0.438 INCHES NOMINAL IN; Material Document and Classification: QQ-C-576 FED SPEC 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.