The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-630-4776, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Fastener Innovation Technology, Inc. Dba F I T. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 25 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-630-4776 |
| Primary Part Number | ST3M571-3-12 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Fastener Innovation Technology, Inc. Dba F I T |
| Status | ACTIVE |
| Extended Washer Thickness | 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Head Height | 0.265 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Fastener Length | 1.132 INCHES MINIMUM AND 1.162 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.340 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Width Between Flats | 0.235 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| 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 |
|---|---|
| ST3M571-3-12 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M571-3-12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB84-3-12 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| ST3M571-3-12 | J M Precision Inc (USA) |
| ST3M571-3-12 PRIMARY | The Boeing Company Div Defense (USA) |
| VAL23033-3-12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-3-12 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VS3060-3-12 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| ST3M571-3-12 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| VS3060-3-12 | Howmet Global Fastening Systems Inc (USA) |
| ST3M571-3-12 PRIMARY | Hi-Shear Corporation (USA) |
| MB84-3-12 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-3-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-3-12 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| MB84-3-12 | Satair A/s (DNK) |
| MB84-3-12 | Hi-Shear Corporation (USA) |
| ST3M571-3-12 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M571-3-12 PRIMARY | Huck International, Inc (USA) |
| ST3M571-3-12 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M571-3-12 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 74328-3-12 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM3326-3-12 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM3326-3-12 | 5/9 Secondary reference U.S. Government activity |
| VS3060-3-12 | 5/9 Secondary reference U.S. Government activity |
| S371-3-12 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-3-12 | 5/9 Secondary reference U.S. Government activity |
| S371-3-12 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 74328-3-12 | 5/2 Secondary reference U.S. Government activity |
| VS3060-3-12 | 5/1 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| ST3M571 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
NSN 5306-00-630-4776 is a Bolt,close Tolerance, manufactured by Fastener Innovation Technology, Inc. Dba F I T, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-630-4776 has 25 manufacturer part numbers on file: ST3M571-3-12 (Fastener Innovation Technology, Inc. Dba F I T), ST3M571-3-12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB84-3-12 (Fairchild Fasteners Europe - Vsd Gmbh), ST3M571-3-12 (J M Precision Inc), ST3M571-3-12 (The Boeing Company Div Defense) and 20 more.
6 possible matches (shared part number, not a government interchangeability claim): 5306-01-623-0098, 5306-01-623-1706, 5306-01-623-1760. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M571-3-12: Extended Washer Thickness: 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN; Head Height: 0.265 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN; Fastener Length: 1.132 INCHES MINIMUM AND 1.162 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 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.