The Washer,concave, cataloged under National Stock Number 5310-01-648-9581, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Washer,concave |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Sps Technologies, Llc Dba PB Fasteners (CAGE 56878); Monadnock Company, the Dba Lisi Aerospace (CAGE 60119) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-648-9581 |
| Primary Part Number | JSFW19P5B |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| 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 |
|---|---|
| JSFW19P5B PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| JSFW19P5B PRIMARY | Monadnock Company, the Dba Lisi Aerospace (USA) |
| Reference | Meaning |
|---|---|
| JSFW19P5B | 1/2 Source control — Government-approved source U.S. Government activity |
| JSFW19 | D/9 Drawing number reference only U.S. Government activity |
NSN 5310-01-648-9581 is a Washer,concave, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-648-9581 has 2 manufacturer part numbers on file: JSFW19P5B (Sps Technologies, Llc Dba PB Fasteners), JSFW19P5B (Monadnock Company, the Dba Lisi Aerospace).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-648-9583, 5310-01-666-0309. Verify interchangeability with system specifications before substitution.
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.