The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-125-5043, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-125-5043 |
| Primary Part Number | HS2601-4-Z-9 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 0.959 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MAC P.S.13145 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Material Document and Classification | AMS5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-3-261 MANUFACTURERS STANDARD |
| Grip Length | 0.802 INCHES MINIMUM AND 0.822 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 | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| VS2938-4-9 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 3M261-4-9 | Howmet Global Fastening Systems Inc (USA) |
| HS2601-4-Z-9 PRIMARY | Huck International, Inc (USA) |
| AIC261M-4-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| VS2938-4-9 | 5/2 Secondary reference U.S. Government activity |
| 66051-4-9 | 5/2 Secondary reference U.S. Government activity |
| 66051-4-9 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HS2601-4-Z-9 | 5/9 Secondary reference U.S. Government activity |
| 3M261-4-9 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 3M261-4-9 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-01-125-5043 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-125-5043 has 4 manufacturer part numbers on file: VS2938-4-9 (Fairchild Fasteners Europe - Vsd Gmbh), 3M261-4-9 (Howmet Global Fastening Systems Inc), HS2601-4-Z-9 (Huck International, Inc), AIC261M-4-9 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for HS2601-4-Z-9: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 0.959 INCHES NOMINAL IN; Surface Treatment Document and Classification: MAC P.S.13145 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.397 INCHES NOMINAL IN. 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.