The Washer,recessed, cataloged under National Stock Number 5310-01-438-2307, 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 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-438-2307 |
| Primary Part Number | K29913-6NF |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Material Document and Classification | AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.795 INCHES MINIMUM AND 0.805 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 OVERALL |
| Hole Diameter | 0.520 INCHES MINIMUM AND 0.530 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 |
|---|---|
| 70191-6U | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 942010-6 | Monadnock Company, the Dba Lisi Aerospace (USA) |
| K29913-6NF PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| BACW10CA6CCU | 7/2 Vendor item drawing reference U.S. Government activity |
| BACW10A6CCU | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-438-2307 is a Washer,recessed, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-438-2307 has 3 manufacturer part numbers on file: 70191-6U (Sps Technologies, Llc Dba PB Fasteners), 942010-6 (Monadnock Company, the Dba Lisi Aerospace), K29913-6NF (Howmet Global Fastening Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-687-8876. Verify interchangeability with system specifications before substitution.
Key specifications for K29913-6NF: Overall Height: 0.135 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM. 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.