The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-165-3312, 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 16 specifications, cited from the U.S. Government catalog. The record lists 14 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-165-3312 |
| Primary Part Number | S397-4-16 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.381 INCHES MINIMUM AND 1.428 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.371 INCHES MINIMUM AND 0.428 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Width Between Flats | 0.448 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| S397-4-16 PRIMARY | Huck International, Inc (USA) |
| HP7747-4-16 | Heartland Precision Fasteners Inc (USA) |
| ST3M747-4-16 | Houston Precision Fasteners I Lp (USA) |
| PBF1266-4-16 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 122896-4-16 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB155-4-16 PRIMARY | Hi-Shear Corporation (USA) |
| SLB254-4-16 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| MB155-4-16 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| GS1031-4-16 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M747-4-16 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| GS1030-4-16 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VS3191-4-16 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| AIC688-4-16 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0002-4-16 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M747-4-16 | 5/9 Secondary reference U.S. Government activity |
| ST3M747-4-16 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 10116052 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 122896-4-16 | 3/2 Design control — primary reference U.S. Government activity |
| VS3191-4-16 | 5/9 Secondary reference U.S. Government activity |
| S397-4-16 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-165-3312 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-165-3312 has 14 manufacturer part numbers on file: S397-4-16 (Huck International, Inc), HP7747-4-16 (Heartland Precision Fasteners Inc), ST3M747-4-16 (Houston Precision Fasteners I Lp), PBF1266-4-16 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 122896-4-16 (Sps Technologies, Llc Dba PB Fasteners) and 9 more.
Key specifications for S397-4-16: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.381 INCHES MINIMUM AND 1.428 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.371 INCHES MINIMUM AND 0.428 INCHES MAXIMUM IN. 16 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.