The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-666-2999, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lyn-Tron, Inc. Dba Lyn-Tron Inc. Government technical data includes 15 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-666-2999 |
| Primary Part Number | SS3737-00 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lyn-Tron, Inc. Dba Lyn-Tron Inc |
| Status | ACTIVE |
| Head Height | 0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Fastener Length | 1.11 INCHES MINIMUM AND 1.14 INCHES MAXIMUM IN |
| Thread Length | 0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| First Diameter From Head | 0.175 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.25 INCHES IN |
| Head Style | KNURLED NO. 4 |
| Thread Direction | RIGHT-HAND |
| Externally Relieved Body Diameter Quantity | 2 |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OVERALL |
| Third Diameter From Head | 0.170 INCHES NOMINAL IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.625 INCHES NOMINAL 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 |
|---|---|
| SS3737-00 PRIMARY | Lyn-Tron, Inc. Dba Lyn-Tron Inc (USA) |
NSN 5305-01-666-2999 is a Screw,externally Relieved Body, manufactured by Lyn-Tron, Inc. Dba Lyn-Tron Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-666-2999 has 1 manufacturer part number on file: SS3737-00 (Lyn-Tron, Inc. Dba Lyn-Tron Inc).
Key specifications for SS3737-00: Head Height: 0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Fastener Length: 1.11 INCHES MINIMUM AND 1.14 INCHES MAXIMUM IN; Thread Length: 0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN; First Diameter From Head: 0.175 INCHES NOMINAL IN. 15 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.