The Washer,convex, cataloged under National Stock Number 5310-01-412-8794, 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. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5310-01-412-8794 |
| Primary Part Number | 70188-8U |
| Item Name | Washer,convex |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM |
| Style Designator | CONVEX |
| Material Document and Classification | AMS 5528 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5643 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Material Thickness | 0.195 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 631 OR STEEL COMP 630 OVERALL |
| Hole Diameter | 0.510 INCHES MINIMUM AND 0.520 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 |
|---|---|
| 70188-8U PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5310-01-412-8794 is a Washer,convex, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-412-8794 has 1 manufacturer part number on file: 70188-8U (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-687-9985. Verify interchangeability with system specifications before substitution.
Key specifications for 70188-8U: Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM; Style Designator: CONVEX; Material Document and Classification: AMS 5528 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5643 ASSN STD 2ND MATERIAL RESPONSE OVERALL; Outside Diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN. 8 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.