The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-268-3885, 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 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-268-3885 |
| Primary Part Number | H51133-5K7 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Lubrication | SOLUBLE LUBRICANT |
| Washer Outside Diameter | 0.532 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 250.0 FAHRENHEIT NOMINAL DEGF |
| Supplementary Features | COLOR CODE BLUE; SPLINE SIZE 12 U/W STD K-FAST TOOL; U/O 1/64 IN. OR 1/32 IN. OVERSIZE SHANK BOLTS; LOCKING TORQUE 30.0 IN-LB; 5550 LB MIN TENSILE;TAMPER PROOF SHEAR DESIGN LBS |
| Washer Thickness | 0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-A-250/13,T73 UNS A97075 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nut Counterbore Depth | 0.117 INCHES MINIMUM AND 0.127 INCHES MAXIMUM WASHER IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Counterbore Diameter | 0.346 INCHES MINIMUM AND 0.350 INCHES MAXIMUM WASHER IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | ANODIZE OVERALL |
| Drive Point Quantity | 8 |
| Nut Style | SPLINE DRIVE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| 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 |
|---|---|
| H51133-5K7 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
NSN 5310-01-268-3885 is a Nut,self-Locking,extended Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-268-3885 has 1 manufacturer part number on file: H51133-5K7 (Howmet Global Fastening Systems Inc).
Key specifications for H51133-5K7: Lubrication: SOLUBLE LUBRICANT; Overall Height: 0.425 INCHES MAXIMUM IN; Washer Outside Diameter: 0.532 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.