The Bolt,shear, cataloged under National Stock Number 5306-01-348-2436, 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 Div PB Fasteners. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 14 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-348-2436 |
| Primary Part Number | ST3M571-4-31 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Extended Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 2.389 INCHES MINIMUM AND 2.419 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Length | 0.466 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM IN |
| Width Between Flats | 0.313 INCHES NOMINAL IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| ST3M571-4-31 | Saturn Fasteners Inc (USA) |
| ST3M571-4-31 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-4-31 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| AIC752-4-31 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M571-4-31 | Heartland Precision Fasteners Inc (USA) |
| 74328-4-31 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-4-31 | Reid Products Inc. Dba Reid Products Inc (USA) |
| S11-1059-4-31 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB84-4-31 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-4-31 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB84-4-31 | Hi-Shear Corporation (USA) |
| VAL23033-4-31 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-4-31 | Houston Precision Fasteners I Lp (USA) |
| ST3M571-4-31 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| Reference | Meaning |
|---|---|
| 74328-4-31 | 5/2 Secondary reference U.S. Government activity |
| BM3326-4-31 | 5/9 Secondary reference U.S. Government activity |
| BM3326-4-31 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| S371-4-31 | 5/9 Secondary reference U.S. Government activity |
| VS3060-4-31 | 5/9 Secondary reference U.S. Government activity |
| S371-4-31 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VS3060-4-31 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
NSN 5306-01-348-2436 is a Bolt,shear, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-348-2436 has 14 manufacturer part numbers on file: ST3M571-4-31 (Saturn Fasteners Inc), ST3M571-4-31 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M571-4-31 (Fastener Innovation Technology, Inc. Dba F I T), AIC752-4-31 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M571-4-31 (Heartland Precision Fasteners Inc) and 9 more.
Key specifications for ST3M571-4-31: Extended Washer Thickness: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 2.389 INCHES MINIMUM AND 2.419 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC 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.