The Washer,concave, cataloged under National Stock Number 5310-01-337-6052, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Monadnock Company, the Dba Lisi Aerospace. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-337-6052 |
| Primary Part Number | 942010-4 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Monadnock Company, the Dba Lisi Aerospace |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Hardness Rating | 52.0 ROCKWELL C MINIMUM AND 56.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN |
| Material Thickness | 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP H11 OVERALL |
| Hole Diameter | 0.358 INCHES MINIMUM AND 0.368 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 |
|---|---|
| 942010-4 | Monadnock Company, the Dba Lisi Aerospace (USA) |
| K29913-104NF | Howmet Global Fastening Systems Inc (USA) |
| 70191-104U | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACW104CCU | 3/2 Design control — primary reference U.S. Government activity |
| BACW10CA104CCU | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5310-01-337-6052 is a Washer,concave, manufactured by Monadnock Company, the Dba Lisi Aerospace, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-337-6052 has 3 manufacturer part numbers on file: 942010-4 (Monadnock Company, the Dba Lisi Aerospace), K29913-104NF (Howmet Global Fastening Systems Inc), 70191-104U (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-669-3959. Verify interchangeability with system specifications before substitution.
Key specifications for 942010-4: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN; Hardness Rating: 52.0 ROCKWELL C MINIMUM AND 56.0 ROCKWELL C MAXIMUM; Style Designator: CONCAVE. 10 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.