The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-341-3134, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bristol Industries, Llc. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-341-3134 |
| Primary Part Number | BH187-8 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.725 INCHES MINIMUM IN |
| Width Across Flats | 0.554 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Washer Thickness | 0.030 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | SLOTTED HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | IRON ALLOY 660 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 |
|---|---|
| BH187-8 PRIMARY | Bristol Industries, Llc (USA) |
| 73783CM-820 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 03A187-8L | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| 03A187-8L | 7/2 Vendor item drawing reference Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
| SMTE9925-8 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-341-3134 is a Nut,self-Locking,extended Washer, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-341-3134 has 3 manufacturer part numbers on file: BH187-8 (Bristol Industries, Llc), 73783CM-820 (Sps Technologies, Llc Dba PB Fasteners), 03A187-8L (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems).
Key specifications for BH187-8: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.250 INCHES NOMINAL IN; Washer Outside Diameter: 0.725 INCHES MINIMUM IN; Width Across Flats: 0.554 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN. 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.