The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-198-6508, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Dressta North America Ltd. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-198-6508 |
| Primary Part Number | 27558R1 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Dressta North America Ltd |
| Status | ACTIVE |
| Head Height | 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN |
| Fastener Length | 13.000 INCHES NOMINAL IN |
| Thread Length | 2.500 INCHES NOMINAL IN |
| Material Document and Classification | SAEGRADE 8 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Surface Treatment | PHOSPHATE MANGANESE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 8 |
| Material | STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1023 OR STEEL COMP 1524 OR STEEL COMP 1025 OR STEEL COMP 1026 OR STEEL COMP 1527 OR STEEL COMP 1029 OR STEEL COMP 1030 OR STEEL COMP 1033 OR STEEL COMP 1034 OR STEEL COMP 1035 OR STEEL COMP 1536 OR STEEL COMP 1037 OR STEEL COMP 1038 OR STEEL COMP 1039 OR STEEL COMP 1040 OR STEEL COMP 1541 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5305-01-198-6508 is a Screw,cap,hexagon Head, manufactured by Dressta North America Ltd, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-198-6508 has 2 manufacturer part numbers on file: 27558R1 (Dressta North America Ltd), 27558R1 (Komatsu America Corp.).
Key specifications for 27558R1: Head Height: 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN; Fastener Length: 13.000 INCHES NOMINAL IN; Thread Length: 2.500 INCHES NOMINAL IN; Material Document and Classification: SAEGRADE 8 ASSN STD ALL MATERIAL RESPONSES OVERALL. 13 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.