The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-321-9051, 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 17 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-321-9051 |
| Primary Part Number | 73573-96-4 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Width Across Flats | 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| Head Height | 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN |
| Fastener Length | 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.172 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNJC |
| Head Diameter | 0.218 INCHES MINIMUM AND 0.226 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 |
|---|---|
| 73573-96-4 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| CBS811-06-4 PRIMARY | Cbs Fasteners, Llc (USA) |
| 965811-203C PRIMARY | Ideal Fasteners, Inc. Dba Ideal Fasteners Inc (USA) |
| AOL4166-203 PRIMARY | All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners (USA) |
| PBF1069-203C PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC811-06-4 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| FS2001-06-203C PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3V2111-203C PRIMARY | 3-V Fastener Co., Inc. (USA) |
| BCP50001-203C PRIMARY | B & B Specialties Inc (USA) |
| Reference | Meaning |
|---|---|
| 965811-203C | 7/2 Vendor item drawing reference U.S. Government activity |
| E723-203 | 5/9 Secondary reference Huck International, Inc |
| 8219-203 | 5/9 Secondary reference First American Sales Co Inc |
| 10125179 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-00-321-9051 is a Screw,cap,socket Head, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-321-9051 has 9 manufacturer part numbers on file: 73573-96-4 (Sps Technologies, Llc Dba PB Fasteners), CBS811-06-4 (Cbs Fasteners, Llc), 965811-203C (Ideal Fasteners, Inc. Dba Ideal Fasteners Inc), AOL4166-203 (All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners), PBF1069-203C (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 4 more.
Key specifications for 73573-96-4: Width Across Flats: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN; Head Height: 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN; Fastener Length: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 17 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.