The Bolt,tee Head, cataloged under National Stock Number 5306-00-075-6136, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-075-6136 |
| Primary Part Number | 557131 |
| Item Name | Bolt,tee Head |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.140 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN |
| Fastener Length | 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS6304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | TEE NO. 6 |
| Thread Direction | RIGHT-HAND |
| Head Length | 0.480 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Width Between Flats | 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Chamfer Angle | 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL 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 |
|---|---|
| 557131 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 922151 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 557131 | Necchi Spa (ITA) |
| Reference | Meaning |
|---|---|
| 557131 | 5/9 Secondary reference Edwards Brothers Inc. |
| 557131 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 557131 | 5/9 Secondary reference Mercury Aerospace Fasteners Inc |
| 557131 | 3/2 Design control — primary reference U.S. Government activity |
| 557131 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| 557131 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
NSN 5306-00-075-6136 is a Bolt,tee Head, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-075-6136 has 3 manufacturer part numbers on file: 557131 (Sps Technologies, Llc Dba PB Fasteners), 922151 (Sps Technologies, Llc Dba PB Fasteners), 557131 (Necchi Spa).
1 possible match (shared part number, not a government interchangeability claim): 5950-00-484-2858. Verify interchangeability with system specifications before substitution.
Key specifications for 557131: Head Height: 0.140 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN; Fastener Length: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.928 INCHES MINIMUM AND 0.948 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.