The Nut,plain,blind Rivet, cataloged under National Stock Number 5310-01-493-7441, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bollhoff Inc. Dba Bollhoff Rivnut Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-493-7441 |
| Primary Part Number | S25B271CSI |
| Item Name | Nut,plain,blind Rivet |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bollhoff Inc. Dba Bollhoff Rivnut Inc |
| Status | ACTIVE |
| Nut Length | 1.021 INCHES MINIMUM AND 1.051 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Head Countersink Angle | 99.00 DEGREES MINIMUM AND 101.00 DEGREES MAXIMUM |
| Material Document and Classification | 66,C1108 FED STD 1ST MATERIAL RESPONSE OR 66,C1110 FED STD 2ND MATERIAL RESPONSE OVERALL |
| Shank End Type | CLOSED |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Nut Diameter | 0.529 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND PHOSPHATE OVERALL |
| Nut Style | BLIND RIVET W/SMOOTH ROUND SHANK |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1108 AND STEEL COMP 1110 OVERALL |
| Head Diameter | 0.328 INCHES MINIMUM AND 0.332 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 |
|---|---|
| S25B271CSI PRIMARY | Bollhoff Inc. Dba Bollhoff Rivnut Inc (USA) |
| Reference | Meaning |
|---|---|
| S25B271CSI | 5/9 Secondary reference Bollhoff Rivnut., Inc. Fastening and Assembly Technology Dba Bollhoff Rivnut., Inc. Div Bollhoff Rivnut., Inc. |
| SC-D-681080-41 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-01-493-7441 is a Nut,plain,blind Rivet, manufactured by Bollhoff Inc. Dba Bollhoff Rivnut Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-493-7441 has 1 manufacturer part number on file: S25B271CSI (Bollhoff Inc. Dba Bollhoff Rivnut Inc).
Key specifications for S25B271CSI: Nut Length: 1.021 INCHES MINIMUM AND 1.051 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL COARSE (UNC); Head Countersink Angle: 99.00 DEGREES MINIMUM AND 101.00 DEGREES MAXIMUM. 16 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.