The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-258-9105, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Main Machine Co., Inc. Div Main Machine & Tool Co.. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-258-9105 |
| Primary Part Number | 2635-008-01 E8.3 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Main Machine Co., Inc. Div Main Machine & Tool Co. |
| Status | ACTIVE |
| Width Across Flats | 0.219 INCHES NOMINAL IN |
| Head Height | 0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN |
| Fastener Length | 1.000 INCHES NOMINAL IN |
| Thread Length | 0.380 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A582 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | ROUND |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.636 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 2635-008-01 E8.3 PRIMARY | Main Machine Co., Inc. Div Main Machine & Tool Co. (USA) |
| Reference | Meaning |
|---|---|
| 2635-008-01 EB.3 | C/1 Advisory reference — outside the item-of-supply concept Main Machine Co., Inc. Div Main Machine & Tool Co. |
| 2635-008-01 E8.3 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5305-01-258-9105 is a Screw,cap,socket Head, manufactured by Main Machine Co., Inc. Div Main Machine & Tool Co., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-258-9105 has 1 manufacturer part number on file: 2635-008-01 E8.3 (Main Machine Co., Inc. Div Main Machine & Tool Co.).
Key specifications for 2635-008-01 E8.3: Width Across Flats: 0.219 INCHES NOMINAL IN; Head Height: 0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN; Fastener Length: 1.000 INCHES NOMINAL IN; Thread Length: 0.380 INCHES NOMINAL IN. 14 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.