The Bolt,shear, cataloged under National Stock Number 5306-01-437-3178, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Saturn Fasteners Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-437-3178 |
| Primary Part Number | 20-057-4S18D |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Saturn Fasteners Inc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Head Height | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN |
| Fastener Length | 1.468 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.343 INCHES NOMINAL IN |
| Material Document and Classification | MIL-B-7838 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.125 INCHES NOMINAL IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2489 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 20-057-4S18D | Saturn Fasteners Inc (USA) |
| 20-057-4S18D | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 20-057-4S18D | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 20-057-4S18D | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 20-057-4S18D | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 20-057-4S18D | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-437-3178 is a Bolt,shear, manufactured by Saturn Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-437-3178 has 5 manufacturer part numbers on file: 20-057-4S18D (Saturn Fasteners Inc), 20-057-4S18D (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 20-057-4S18D (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 20-057-4S18D (Sps Technologies, Llc Dba PB Fasteners), 20-057-4S18D (Howmet Global Fastening Systems Inc).
Key specifications for 20-057-4S18D: Extended Washer Thickness: 0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN; Head Height: 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN; Fastener Length: 1.468 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TY2 CL2 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.