The Screw,shoulder, cataloged under National Stock Number 5305-01-437-4140, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Unison Industries Llc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-437-4140 |
| Primary Part Number | M1553 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Unison Industries Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| M1553 PRIMARY | Unison Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| M1553 | 5/9 Secondary reference Unison Industries Inc Slick Products Div |
NSN 5305-01-437-4140 is a Screw,shoulder, manufactured by Unison Industries Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-437-4140 has 1 manufacturer part number on file: M1553 (Unison Industries Llc).
Key specifications for M1553: Special Features: HARNESS CAP SCREW USED TO MOUNT (3 REQUIRED) IGNITION HARNESS TO MAGNETO FOR PISTON ENGINE AIRCRAFT. 0 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.