The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-193-4083, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lehigh Armstrong Inc. Government technical data includes 11 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-193-4083 |
| Primary Part Number | 16990-6-F-20-B |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lehigh Armstrong Inc |
| Status | ACTIVE |
| Width Across Flats | 0.218 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Thread Length | 1.000 INCHES NOMINAL IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.781 INCHES NOMINAL 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 |
|---|---|
| 16990-6-F-20-B PRIMARY | Lehigh Armstrong Inc (USA) |
| 12335148 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 16990-6-F-20-B PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5305-01-193-4083 is a Screw,cap,socket Head, manufactured by Lehigh Armstrong Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-193-4083 has 3 manufacturer part numbers on file: 16990-6-F-20-B (Lehigh Armstrong Inc), 12335148 (U S Army Tank Automotive Command Amsta-Im-Mm), 16990-6-F-20-B (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 16990-6-F-20-B: Width Across Flats: 0.218 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN; Fastener Length: 1.250 INCHES NOMINAL IN; Thread Length: 1.000 INCHES NOMINAL IN; Head Style: FLAT COUNTERSUNK. 11 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.