The Bolt,machine, cataloged under National Stock Number 5306-00-842-1237, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-842-1237 |
| Primary Part Number | MS20038-4 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN |
| Fastener Length | 1.328 INCHES NOMINAL IN |
| Special Test Features | RAPTURE STRENGTH AN 1200 DEG F SHALL NOT BE LESS THAN 47000 PSI IN 100 HRS DEGF |
| Thread Length | 0.828 INCHES MINIMUM IN |
| Material Document and Classification | MIL-B-7874 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.500 INCHES NOMINAL IN |
| Width Between Flats | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 110000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 90000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| MS20038-4 | Howmet Global Fastening Systems Inc (USA) |
| MS20038-4 | Lamson and Sessions Co the (USA) |
| MS20038-4 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| MS20038-4 | 5/9 Secondary reference U.S. Government activity |
| LE20038-4 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| MS20038-4 | 5/2 Secondary reference U.S. Government activity |
| NASM7874 | 3/1 Design control — primary reference U.S. Government activity |
| MS20038-4 | 5/9 Secondary reference U.S. Government activity |
| MS20038-4 | 5/9 Secondary reference U.S. Government activity |
| MS20038-4 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| MS20038-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-842-1237 is a Bolt,machine, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-842-1237 has 3 manufacturer part numbers on file: MS20038-4 (Howmet Global Fastening Systems Inc), MS20038-4 (Lamson and Sessions Co the), MS20038-4 (Huck International, Inc).
Key specifications for MS20038-4: Head Height: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN; Fastener Length: 1.328 INCHES NOMINAL IN; Special Test Features: RAPTURE STRENGTH AN 1200 DEG F SHALL NOT BE LESS THAN 47000 PSI IN 100 HRS DEGF; Thread Length: 0.828 INCHES MINIMUM 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.