The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-053-4553, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. 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 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-053-4553 |
| Primary Part Number | 310243 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 1.270 MILLIMETERS NOMINAL MM |
| Head Height | 6.096 MILLIMETERS NOMINAL MM |
| Surface Treatment Document and Classification | 1E397,CAGEC 11083 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 13.208 MILLIMETERS NOMINAL MM |
| Thread Length | 15.875 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 9.525 MILLIMETERS NOMINAL MM |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL 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 |
| Part Number | Manufacturer |
|---|---|
| 310243 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5305-01-053-4553 is a Screw,cap,hexagon Head, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-053-4553 has 1 manufacturer part number on file: 310243 (Caterpillar Inc Div Caterpillar Defense).
2 possible matches (shared part number, not a government interchangeability claim): 6220-01-189-7039, 6515-01-589-7032. Verify interchangeability with system specifications before substitution.
Key specifications for 310243: Extended Washer Thickness: 1.270 MILLIMETERS NOMINAL MM; Head Height: 6.096 MILLIMETERS NOMINAL MM; Surface Treatment Document and Classification: 1E397,CAGEC 11083 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Extended Washer Diameter: 13.208 MILLIMETERS NOMINAL MM. 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.