The Bolt,machine, cataloged under National Stock Number 5306-01-049-2157, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Lamson and Sessions Co the. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-049-2157 |
| Primary Part Number | MS20038-24 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lamson and Sessions Co the |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN |
| Fastener Length | 3.312 INCHES MINIMUM AND 3.359 INCHES MAXIMUM IN |
| Thread Length | 0.796 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Hardness Rating | 27.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.484 INCHES MINIMUM AND 2.516 INCHES MAXIMUM IN |
| Width Between Flats | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| 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 |
|---|---|
| MS20038-24 | Lamson and Sessions Co the (USA) |
| Reference | Meaning |
|---|---|
| MS20038-24 | 5/9 Secondary reference U.S. Government activity |
| MS20038-24 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| MS20038-24 | 5/2 Secondary reference U.S. Government activity |
| MS20038-24 | 3/2 Design control — primary reference U.S. Government activity |
| MS20038-24 | 5/9 Secondary reference U.S. Government activity |
| LE20038-24 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| MS20038-24 | 5/9 Secondary reference U.S. Government activity |
| MS20038-24 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| MS20038-24 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NASM7874 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5306-01-049-2157 is a Bolt,machine, manufactured by Lamson and Sessions Co the, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-049-2157 has 1 manufacturer part number on file: MS20038-24 (Lamson and Sessions Co the).
Key specifications for MS20038-24: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN. 17 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.