The Bolt,shoulder, cataloged under National Stock Number 5306-01-132-2156, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-132-2156 |
| Primary Part Number | VS3251-4D31 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN |
| Fastener Length | 2.347 INCHES MINIMUM AND 2.377 INCHES MAXIMUM IN |
| Shoulder Length | 1.927 INCHES MINIMUM AND 1.937 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.159 INCHES MINIMUM AND 2.209 INCHES MAXIMUM 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 |
|---|---|
| VS3251-4D31 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M494-4D31 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| S11-1065-4D31 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| PBF1263-4D31 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| VS3251-4D31 | 5/9 Secondary reference U.S. Government activity |
| ST3M494-4D31 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M494-4D31 | 3/2 Design control — primary reference U.S. Government activity |
| 10115880 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5306-01-132-2156 is a Bolt,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-132-2156 has 4 manufacturer part numbers on file: VS3251-4D31 (Howmet Global Fastening Systems Inc), ST3M494-4D31 (Sps Technologies Ltd, Tj Brooks Division), S11-1065-4D31 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), PBF1263-4D31 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for VS3251-4D31: Head Height: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN; Fastener Length: 2.347 INCHES MINIMUM AND 2.377 INCHES MAXIMUM IN; Shoulder Length: 1.927 INCHES MINIMUM AND 1.937 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.3115 INCHES MINIMUM AND 0.3120 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.