The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-070-8171, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. 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 | 5305-01-070-8171 |
| Primary Part Number | 639AS872 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Width Across Flats | 0.078 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.083 INCHES MINIMUM AND 0.086 INCHES MAXIMUM IN |
| Fastener Length | 0.375 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.250 INCHES NOMINAL IN |
| Hardness Rating | 80.0 ROCKWELL B NOMINAL OVERALL |
| Material Document and Classification | QQ-S-763,COMP 302 OR 303 OR304 OR 305 OR 316 FED SPEC SINGLE MATERIAL RESPONSE OR 66,302 OR 303 OR304 OR 305 OR 316 OR 16-18 OR 18-8 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.086 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PELLET THREADS |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Yield Strength | 30000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 56 |
| Material | STEEL CORROSION RESISTING OR NICKEL ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.134 INCHES MINIMUM AND 0.140 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 |
|---|---|
| 639AS872 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 5305-01-070-8171 is a Screw,cap,socket Head, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-070-8171 has 1 manufacturer part number on file: 639AS872 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 639AS872: Width Across Flats: 0.078 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.083 INCHES MINIMUM AND 0.086 INCHES MAXIMUM IN; Fastener Length: 0.375 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED 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.