The Bolt,shoulder, cataloged under National Stock Number 5306-00-377-4124, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 18 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-377-4124 |
| Primary Part Number | ST2137-03 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Head Height | 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Fastener Length | 0.720 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN |
| Shoulder Length | 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | PWA 37 FSCM 77445 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.248 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.587 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS CHAMFERED |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.730 INCHES MINIMUM AND 0.737 INCHES MAXIMUM 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 |
|---|---|
| ST2137-03 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2137-03 | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| ST2137-03 | 5/9 Secondary reference Foret Systems Inc |
| 5306PL1495276 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| ST2137-03 | 5/9 Secondary reference Gkn Aerospace Chem-Tronics Inc |
NSN 5306-00-377-4124 is a Bolt,shoulder, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-377-4124 has 2 manufacturer part numbers on file: ST2137-03 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST2137-03 (Rtx Corporation Div Pratt & Whitney).
Key specifications for ST2137-03: Head Height: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN; Fastener Length: 0.720 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN; Shoulder Length: 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: PWA 37 FSCM 77445 MFR REF 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.