The Bolt,shoulder, cataloged under National Stock Number 5306-00-281-3254, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Fairbanks Morse, Llc. 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through both NSN and commercial part number lookups. 25 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-281-3254 |
| Primary Part Number | 21SAF10B571FPC56 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Head Height | 0.453 INCHES NOMINAL IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Shoulder Length | 1.062 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.7480 INCHES MINIMUM AND 0.7520 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.938 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Shank Unthreaded Hole Diameter | 0.125 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | SAE GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.000 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.469 INCHES NOMINAL FIRST HOLE IN |
| 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 |
|---|---|
| 21SAF10B571FPC56 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAF9B571APC2 PRIMARY | Fairbanks Morse, Llc (USA) |
| AFB4754D PRIMARY | Fairbanks Morse, Llc (USA) |
| 15AF9B571APC58 PRIMARY | Fairbanks Morse, Llc (USA) |
| AFA4754C PRIMARY | Fairbanks Morse, Llc (USA) |
| 16AFA571APC54 PRIMARY | Fairbanks Morse, Llc (USA) |
| 22AF10C571BPC2 PRIMARY | Fairbanks Morse, Llc (USA) |
| 22AF10C571BPC66 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAAF10B571APC2 PRIMARY | Fairbanks Morse, Llc (USA) |
| 15AF9B571GPC58 PRIMARY | Fairbanks Morse, Llc (USA) |
| 7AF9B571APC58 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAFB571CPC2 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAAF10B571APC56 PRIMARY | Fairbanks Morse, Llc (USA) |
| 9AF9B571APC2 PRIMARY | Fairbanks Morse, Llc (USA) |
| 7AF9B571GPC58 PRIMARY | Fairbanks Morse, Llc (USA) |
| 13AF10B571DPC66 PRIMARY | Fairbanks Morse, Llc (USA) |
| AFB4754E PRIMARY | Fairbanks Morse, Llc (USA) |
| 21SAF10B571APC56 PRIMARY | Fairbanks Morse, Llc (USA) |
| MAFB571CPC56 PRIMARY | Fairbanks Morse, Llc (USA) |
| 16AFA571EPC54 PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| 22AF10C571BPC2 | 5/9 Secondary reference U.S. Government activity |
| AFB4754E | 5/9 Secondary reference U.S. Government activity |
| 21SAF10B571FPC56 | 5/9 Secondary reference U.S. Government activity |
| MAAF10B571APC2 | 5/9 Secondary reference U.S. Government activity |
| 13AF10B571APC66 | 5/9 Secondary reference U.S. Government activity |
| MAFB571CPC2 | 5/9 Secondary reference U.S. Government activity |
| 7AF9B571GPC58 | 5/9 Secondary reference U.S. Government activity |
| 9AF9B571APC2 | 5/9 Secondary reference U.S. Government activity |
| MAF9B571APC2 | 5/9 Secondary reference U.S. Government activity |
| 15AF9B571APC58 | 5/9 Secondary reference U.S. Government activity |
| 22AF10C571APC2 | 5/9 Secondary reference U.S. Government activity |
| AFA4754C | 5/9 Secondary reference U.S. Government activity |
| 16AFA571EPC54 | 5/9 Secondary reference U.S. Government activity |
| 15AF9B571GPC58 | 5/9 Secondary reference U.S. Government activity |
| 13AF10B571DPC66 | 5/9 Secondary reference U.S. Government activity |
| 7AF9B571APC58 | 5/9 Secondary reference U.S. Government activity |
| MAAF10B571APC56 | 5/9 Secondary reference U.S. Government activity |
| 22AF10C571BPC66 | 5/9 Secondary reference U.S. Government activity |
| 16AFA571APC54 | 5/9 Secondary reference U.S. Government activity |
| 9AF9B571DPC2 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-281-3254 is a Bolt,shoulder, manufactured by Fairbanks Morse, Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-281-3254 has 25 manufacturer part numbers on file: 21SAF10B571FPC56 (Fairbanks Morse, Llc), MAF9B571APC2 (Fairbanks Morse, Llc), AFB4754D (Fairbanks Morse, Llc), 15AF9B571APC58 (Fairbanks Morse, Llc), AFA4754C (Fairbanks Morse, Llc) and 20 more.
Key specifications for 21SAF10B571FPC56: Head Height: 0.453 INCHES NOMINAL IN; Fastener Length: 2.250 INCHES NOMINAL IN; Shoulder Length: 1.062 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.7480 INCHES MINIMUM AND 0.7520 INCHES MAXIMUM FIRST SHOULDER IN. 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.