The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-059-1948, 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 6 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-059-1948 |
| Primary Part Number | MS21297-14056 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Extended Washer Thickness | 0.116 INCHES MINIMUM AND 0.136 INCHES MAXIMUM IN |
| Head Height | 0.690 INCHES MINIMUM AND 0.710 INCHES MAXIMUM IN |
| Fastener Length | 4.848 INCHES MINIMUM AND 4.878 INCHES MAXIMUM IN |
| Extended Washer Diameter | 1.615 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Thread Length | 1.338 INCHES MINIMUM AND 1.388 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.875 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 3.490 INCHES MINIMUM AND 3.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.8730 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 14 |
| Material | STEEL COMP H11 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 | F |
| Part Number | Manufacturer |
|---|---|
| MS21297-14056 | Huck International, Inc (USA) |
| MS21297-14056 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MS21297-14056 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MS21297-14056 | Tactair Fluid Controls Inc (USA) |
| MS21297-14056 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MS21297-14056 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| MS21297-14056 | 5/9 Secondary reference Acufast Aircraft Products |
| MS21297-14056 | 3/2 Design control — primary reference U.S. Government activity |
| MS21297-14056 | 5/9 Secondary reference U.S. Government activity |
| MS21297-14056 | 5/9 Secondary reference U.S. Government activity |
| MS21297-14056 | 5/9 Secondary reference U.S. Government activity |
| MS21297-14056 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-059-1948 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-059-1948 has 6 manufacturer part numbers on file: MS21297-14056 (Huck International, Inc), MS21297-14056 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), MS21297-14056 (Sps Technologies, Llc Dba PB Fasteners), MS21297-14056 (Tactair Fluid Controls Inc), MS21297-14056 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 1 more.
Key specifications for MS21297-14056: Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Extended Washer Thickness: 0.116 INCHES MINIMUM AND 0.136 INCHES MAXIMUM IN; Head Height: 0.690 INCHES MINIMUM AND 0.710 INCHES MAXIMUM 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.