The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-971-7208, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-971-7208 |
| Primary Part Number | 505771 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Head Height | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Concentric Hole Depth | 0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN |
| Thread Length | 0.431 INCHES MINIMUM AND 0.491 INCHES MAXIMUM IN |
| Style Designator | COUNTERBORE THREADED |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.505 INCHES MINIMUM AND 0.506 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | NICKEL ALLOY OVERALL |
| Shoulder Length | 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 505771 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 505771 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| 505771 | 5/2 Secondary reference U.S. Government activity |
| 505771 | 5/2 Secondary reference U.S. Government activity |
| 505771 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-971-7208 is a Bolt,internally Relieved Body, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-971-7208 has 2 manufacturer part numbers on file: 505771 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 505771 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
1 possible match (shared part number, not a government interchangeability claim): 5985-01-121-0140. Verify interchangeability with system specifications before substitution.
Key specifications for 505771: Head Height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN; Concentric Hole Depth: 0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN; Thread Length: 0.431 INCHES MINIMUM AND 0.491 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.