The Bolt,shear, cataloged under National Stock Number 5306-00-253-1665, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 19 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-253-1665 |
| Primary Part Number | ST3M571-6-15 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN |
| Head Height | 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN |
| Fastener Length | 1.536 INCHES MINIMUM AND 1.566 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN |
| Thread Length | 0.614 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| ST3M571-6-15 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC752-6-15 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| S11-1059-6-15 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB84-6-15 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SLB253-6-15 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| GS1030-6-15 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| MB84-6-15 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| VS3060-6-15 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| ST3M571-6-15 | Saturn Fasteners Inc (USA) |
| HP7571-6-15 | Heartland Precision Fasteners Inc (USA) |
| ST3M571-6-15 | Houston Precision Fasteners I Lp (USA) |
| ST3M571-6-15 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 74328-6-15 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-6-15 PRIMARY | The Boeing Company Div Defense (USA) |
| MB84-6-15 | Hi-Shear Corporation (USA) |
| VAL23033-6-15 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| S371-6-15 | Huck International, Inc (USA) |
| 11831-6-15 | Reid Products Inc. Dba Reid Products Inc (USA) |
| VS3060-6-15 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| BM3326-6-15 | 5/9 Secondary reference U.S. Government activity |
| 74328-6-15 | 5/2 Secondary reference U.S. Government activity |
| S371-6-15 | 5/9 Secondary reference U.S. Government activity |
| VS3060-6-15 | 5/9 Secondary reference U.S. Government activity |
| BM3326-6-15 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5306-00-253-1665 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-253-1665 has 19 manufacturer part numbers on file: ST3M571-6-15 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), AIC752-6-15 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), S11-1059-6-15 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), MB84-6-15 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), SLB253-6-15 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok) and 14 more.
Key specifications for ST3M571-6-15: Extended Washer Thickness: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Head Height: 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN; Fastener Length: 1.536 INCHES MINIMUM AND 1.566 INCHES MAXIMUM IN; Extended Washer Diameter: 0.639 INCHES MINIMUM AND 0.649 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.