The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-224-5973, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Federal Manufacturing Corp. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-224-5973 |
| Primary Part Number | BACB30NF4-71 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Federal Manufacturing Corp |
| Status | ACTIVE |
| Head Height | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN |
| Fastener Length | 4.838 INCHES MINIMUM AND 4.888 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 81205-NAS6604 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 4.428 INCHES MINIMUM AND 4.448 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4340 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 4.670 INCHES MINIMUM AND 4.700 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| BACB30NF4-71 | Federal Manufacturing Corp (USA) |
| BACB30NF4-71 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30NF4-71 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30NF4-71 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30NF4-71 | Howmet Global Fastening Systems Inc (USA) |
| BACB30NF4-71 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30NF4-71 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30NF4-71 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30NF4-71 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30NF4-71 | 5/9 Secondary reference U.S. Government activity |
| BACB30NF4-71 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
NSN 5306-01-224-5973 is a Bolt,close Tolerance, manufactured by Federal Manufacturing Corp, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-224-5973 has 8 manufacturer part numbers on file: BACB30NF4-71 (Federal Manufacturing Corp), BACB30NF4-71 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30NF4-71 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30NF4-71 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30NF4-71 (Howmet Global Fastening Systems Inc) and 3 more.
Key specifications for BACB30NF4-71: Head Height: 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN; Fastener Length: 4.838 INCHES MINIMUM AND 4.888 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.400 INCHES MINIMUM AND 0.450 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.