The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-477-5583, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-477-5583 |
| Primary Part Number | SLB255-12D24 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok |
| Status | ACTIVE |
| Extended Washer Thickness | 0.198 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN |
| Head Height | 0.600 INCHES NOMINAL IN |
| Fastener Length | 1.537 INCHES MINIMUM AND 1.567 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 1.389 INCHES NOMINAL IN |
| Thread Length | 1.052 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.552 INCHES NOMINAL IN |
| Head Minor Diameter | 0.797 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Grip Diameter | 0.7480 INCHES MINIMUM AND 0.7490 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 | Y |
| Part Number | Manufacturer |
|---|---|
| ST3M753-12D24 | Houston Precision Fasteners I Lp (USA) |
| SLB255-12D24 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 122897-12D24 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| AIC763-12D24 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HP7753-12D24 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M753-12D24 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M753-12D24 | The Boeing Company Div Defense (USA) |
| ST3M753-12D24 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GS1032-12D24 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 11829-12D24 | Reid Products Inc. Dba Reid Products Inc (USA) |
| S343-12D24 PRIMARY | Huck International, Inc (USA) |
| VS3190-12D24 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| MB15612D24 PRIMARY | Hi-Shear Corporation (USA) |
| PBF1267-12D24 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VFK600-12D24 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 122897-12D24 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-477-5583 is a Bolt,close Tolerance, manufactured by Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-477-5583 has 15 manufacturer part numbers on file: ST3M753-12D24 (Houston Precision Fasteners I Lp), SLB255-12D24 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), 122897-12D24 (Sps Technologies, Llc Dba PB Fasteners), AIC763-12D24 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HP7753-12D24 (Heartland Precision Fasteners Inc) and 10 more.
Key specifications for SLB255-12D24: Extended Washer Thickness: 0.198 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN; Head Height: 0.600 INCHES NOMINAL IN; Fastener Length: 1.537 INCHES MINIMUM AND 1.567 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.