The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-656-1971, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-656-1971 |
| Primary Part Number | 19E2401083-5 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army |
| Status | ACTIVE |
| Width Across Flats | 0.156 INCHES NOMINAL IN |
| Head Height | 0.156 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Thread Length | 0.750 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.437 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 |
|---|---|
| 92220A222 | Mcmaster-Carr Supply Co (USA) |
| 19E2401083-5 PRIMARY | Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army (USA) |
| Reference | Meaning |
|---|---|
| 19E2401083 | D/9 Drawing number reference only Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army |
NSN 5305-01-656-1971 is a Screw,cap,socket Head, manufactured by Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-656-1971 has 2 manufacturer part numbers on file: 92220A222 (Mcmaster-Carr Supply Co), 19E2401083-5 (Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army).
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-656-1994, 5305-01-656-2053. Verify interchangeability with system specifications before substitution.
Key specifications for 19E2401083-5: Width Across Flats: 0.156 INCHES NOMINAL IN; Head Height: 0.156 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES NOMINAL IN; Thread Length: 0.750 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.