The Washer,concave, cataloged under National Stock Number 5310-01-160-4555, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-160-4555 |
| Primary Part Number | K39787-5 |
| 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 | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Material Document and Classification | MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6358 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.608 INCHES MINIMUM AND 0.618 INCHES MAXIMUM IN |
| Material Thickness | 0.106 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 4130 OR STEEL COMP 8740 OVERALL |
| Hole Diameter | 0.417 INCHES MINIMUM AND 0.427 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 |
|---|---|
| K39787-5 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| LE153-0002-0005 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| LE153-0002-0005 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
| LE153-0002-0005 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-160-4555 is a Washer,concave, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-160-4555 has 2 manufacturer part numbers on file: K39787-5 (Howmet Global Fastening Systems Inc), LE153-0002-0005 (Howmet Global Fastening Systems Inc).
Key specifications for K39787-5: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 46.0 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.