The Screw,close Tolerance, cataloged under National Stock Number 5305-01-504-0534, 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 17 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-504-0534 |
| Primary Part Number | BACB30LH3U3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Fastener Length | 0.532 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35, TY 2 OR 8(CLASS 95SC120 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.345 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.187 INCHES NOMINAL IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1985 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE 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 | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.295 INCHES MINIMUM AND 0.334 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 |
|---|---|
| BACB30LH3U3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3U3 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH3U3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LH3U3 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH3U3 | Federal Manufacturing Corp (USA) |
| BACB30LH3U3 | Howmet Global Fastening Systems Inc (USA) |
| BACB30LH3U3 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3U3 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
| BACB30LH3U3 | 5/2 Secondary reference U.S. Government activity |
| BACB30LH3U3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-504-0534 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 5305-01-504-0534 has 7 manufacturer part numbers on file: BACB30LH3U3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3U3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH3U3 (Sps Technologies, Llc Dba PB Fasteners), BACB30LH3U3 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LH3U3 (Federal Manufacturing Corp) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6757. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30LH3U3: Fastener Length: 0.532 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35, TY 2 OR 8(CLASS 95SC120 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.345 INCHES NOMINAL IN; Material Document and Classification: AMS 5737 ASSN STD 1ST MATERIAL 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.