The Washer,concave, cataloged under National Stock Number 5310-00-934-9976, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-934-9976 |
| Primary Part Number | K19701-3 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| Style Designator | CONCAVE |
| Outside Diameter | 0.375 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Recess Depth | 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN |
| Material Thickness | 0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.252 INCHES MINIMUM AND 0.258 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 |
|---|---|
| 2110546 | Embraer Aviation International (FRA) |
| K19701-3 | Boeing Distribution Services SAS (FRA) |
| K19701-3 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 2110546 | Embraer S.a. (BRA) |
| Reference | Meaning |
|---|---|
| 2110546 | 5/9 Secondary reference Embraer Empresa Brasileira De Aeronautica Sa |
| K19701-3 | 5/9 Secondary reference Klx Aerospace Solutions II SAS |
NSN 5310-00-934-9976 is a Washer,concave, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-934-9976 has 4 manufacturer part numbers on file: 2110546 (Embraer Aviation International), K19701-3 (Boeing Distribution Services SAS), K19701-3 (Howmet Global Fastening Systems Inc), 2110546 (Embraer S.a.).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-412-2698. Verify interchangeability with system specifications before substitution.
Key specifications for K19701-3: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN; Style Designator: CONCAVE; Outside Diameter: 0.375 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN. 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.