The Screw,close Tolerance, cataloged under National Stock Number 5305-01-435-9139, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-435-9139 |
| Primary Part Number | BACB30LH3-12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.080 INCHES MINIMUM AND 1.110 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.345 INCHES NOMINAL IN |
| Material Document and Classification | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | CHROMATE AND CADMIUM OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.337 INCHES MINIMUM AND 0.383 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 |
|---|---|
| BACB30LH3-12 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LH3-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LH3-12 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3-12 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH3-12 | Federal Manufacturing Corp (USA) |
| BACB30LH3-12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3-12 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| BACB30LH3-12 | 5/2 Secondary reference U.S. Government activity |
| BACB30LH3-12 | 5/9 Secondary reference Huck International, Inc |
NSN 5305-01-435-9139 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-435-9139 has 6 manufacturer part numbers on file: BACB30LH3-12 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30LH3-12 (Sps Technologies, Llc Dba PB Fasteners), BACB30LH3-12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3-12 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH3-12 (Federal Manufacturing Corp) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6600. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30LH3-12: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.080 INCHES MINIMUM AND 1.110 INCHES MAXIMUM IN. 20 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.