The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-421-9535, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 18 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 | 5305-01-421-9535 |
| Primary Part Number | 16690-8F-28B |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Fastener Length | 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-S-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.650 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL UNS K03104 OVERALL |
| Thread Series Designator | UNRF |
| Head Diameter | 0.872 INCHES MINIMUM AND 0.937 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 |
|---|---|
| 16690-8F-28B PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5305-01-421-9535 is a Screw,cap,socket Head, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-421-9535 has 1 manufacturer part number on file: 16690-8F-28B (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 16690-8F-28B: Width Across Flats: 0.312 INCHES NOMINAL IN; Fastener Length: 1.690 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-S-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 1.650 INCHES MAXIMUM IN. 18 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.