The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-338-2828, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is H-K Connecticut Holding Company. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-338-2828 |
| Primary Part Number | 135601-20 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | H-K Connecticut Holding Company |
| Status | ACTIVE |
| Width Across Flats | 0.1562 INCHES MINIMUM AND 0.1587 INCHES MAXIMUM IN |
| Head Height | 0.183 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN |
| Fastener Length | 12.778 INCHES MINIMUM AND 12.902 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.000 INCHES MINIMUM IN |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.303 INCHES MINIMUM AND 0.312 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 |
|---|---|
| 135601-20 PRIMARY | H-K Connecticut Holding Company (USA) |
| 135601-20 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 135601-20 PRIMARY | Fastener Technology Corp (USA) |
| 135601-20 | Raytheon Company (USA) |
| Reference | Meaning |
|---|---|
| 135601-20 | 3/2 Design control — primary reference U.S. Government activity |
| 135601-20 | 5/9 Secondary reference Atlas Copco Inc |
| 135601-20 | 5/9 Secondary reference Bristol Socket Screw Co |
| 135601-20 | 5/9 Secondary reference Allen Mfg Co Sub of Chicago Pneumatic Tool Co |
NSN 5305-01-338-2828 is a Screw,cap,socket Head, manufactured by H-K Connecticut Holding Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-338-2828 has 4 manufacturer part numbers on file: 135601-20 (H-K Connecticut Holding Company), 135601-20 (Sps Technologies, Llc Dba PB Fasteners), 135601-20 (Fastener Technology Corp), 135601-20 (Raytheon Company).
Key specifications for 135601-20: Width Across Flats: 0.1562 INCHES MINIMUM AND 0.1587 INCHES MAXIMUM IN; Head Height: 0.183 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN; Fastener Length: 12.778 INCHES MINIMUM AND 12.902 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.