The Screw,close Tolerance, cataloged under National Stock Number 5305-00-933-7291, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-933-7291 |
| Primary Part Number | HL21PB8-14 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Width Across Flats | 0.095 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN |
| Fastener Length | 1.260 INCHES MINIMUM AND 1.280 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.380 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.464 INCHES MINIMUM AND 0.510 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 |
|---|---|
| BACB30JC8-14 | West Coast Aerospace, Inc. (USA) |
| HL21PB8-14 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BACB30JC8-14 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HL21PB8-14 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30JC8-14 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HL21PB8-14 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HL21PB8-14 | 5/9 Secondary reference U.S. Government activity |
| HL21PB8-14 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BACB30JC8-14 | 7/2 Vendor item drawing reference The Boeing Company |
NSN 5305-00-933-7291 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-933-7291 has 6 manufacturer part numbers on file: BACB30JC8-14 (West Coast Aerospace, Inc.), HL21PB8-14 (Howmet Global Fastening Systems Inc), BACB30JC8-14 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HL21PB8-14 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30JC8-14 (Sps Technologies, Llc Dba PB Fasteners) and 1 more.
Key specifications for HL21PB8-14: Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Width Across Flats: 0.095 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN; Fastener Length: 1.260 INCHES MINIMUM AND 1.280 INCHES MAXIMUM IN. 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.