The Screw,close Tolerance, cataloged under National Stock Number 5305-01-045-2902, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Federal Manufacturing Corp. Government technical data includes 18 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-045-2902 |
| Primary Part Number | BACB30LU5-23 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Federal Manufacturing Corp |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.891 INCHES MINIMUM AND 1.921 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.427 INCHES MINIMUM AND 1.447 INCHES MAXIMUM IN |
| Grip Diameter | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 8740 OR STEEL COMP E4340 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.574 INCHES MINIMUM AND 0.637 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 |
|---|---|
| BACB30LU5-23 PRIMARY | Federal Manufacturing Corp (USA) |
| BACB30LU5-23 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| BACB30LU5-23 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BACB30LU5-23 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LU5-23 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LU5-23 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LU5-23 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| BACB30LU5-23 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BACB30LU5-23 | 5/9 Secondary reference U.S. Government activity |
| BACB30LU5-23 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LU5-23 | 7/2 Vendor item drawing reference U.S. Government activity |
| BACB30LU5-23 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-045-2902 is a Screw,close Tolerance, manufactured by Federal Manufacturing Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-2902 has 7 manufacturer part numbers on file: BACB30LU5-23 (Federal Manufacturing Corp), BACB30LU5-23 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), BACB30LU5-23 (Howmet Global Fastening Systems Inc), BACB30LU5-23 (Sps Technologies, Llc Dba PB Fasteners), BACB30LU5-23 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 2 more.
Key specifications for BACB30LU5-23: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.891 INCHES MINIMUM AND 1.921 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 18 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.