The Thumbscrew, cataloged under National Stock Number 5305-01-536-2991, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Clarke Hess Communication Research Corp. Government technical data includes 5 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 | 5305-01-536-2991 |
| Primary Part Number | 400-031 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Clarke Hess Communication Research Corp |
| Status | ACTIVE |
| Thread Pitch in Millimeters | 0.600 |
| Nominal Thread Diameter | 3.500 MILLIMETERS MM |
| Thread Direction | RIGHT-HAND |
| Material | STEEL OVERALL |
| Thread Series Designator | M |
| 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 |
|---|---|
| 400-031 PRIMARY | Clarke Hess Communication Research Corp (USA) |
NSN 5305-01-536-2991 is a Thumbscrew, manufactured by Clarke Hess Communication Research Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-536-2991 has 1 manufacturer part number on file: 400-031 (Clarke Hess Communication Research Corp).
2 possible matches (shared part number, not a government interchangeability claim): 6680-01-615-2906, 1005-01-715-1257. Verify interchangeability with system specifications before substitution.
Key specifications for 400-031: Thread Pitch in Millimeters: 0.600; Nominal Thread Diameter: 3.500 MILLIMETERS MM; Thread Direction: RIGHT-HAND; End Item Identification: NHA: IEEE-488 CONNECTOR; MODEL 2500 S1020 VOLTMETER - 6625-01-531-2593. 5 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.