The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-717-5271, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bossard Intl Inc. Government technical data includes 12 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-717-5271 |
| Primary Part Number | BN2104M4X12A2 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bossard Intl Inc |
| Status | ACTIVE |
| Width Across Flats | 2.5 MILLIMETERS NOMINAL MM |
| Head Height | 2.48 MILLIMETERS MAXIMUM MM |
| Fastener Length | 12.0 MILLIMETERS NOMINAL MM |
| Thread Pitch in Millimeters | 0.7 |
| Nominal Thread Diameter | 4.0 MILLIMETERS MM |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 90.0 DEGREES NOMINAL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | M |
| Head Diameter | 7.96 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| BN2104M4X12A2 PRIMARY | Bossard Intl Inc (USA) |
| IN3109254XN | Illca S.m.i S.r.l. (ITA) |
NSN 5305-01-717-5271 is a Screw,cap,socket Head, manufactured by Bossard Intl Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-717-5271 has 2 manufacturer part numbers on file: BN2104M4X12A2 (Bossard Intl Inc), IN3109254XN (Illca S.m.i S.r.l.).
Key specifications for BN2104M4X12A2: Width Across Flats: 2.5 MILLIMETERS NOMINAL MM; Head Height: 2.48 MILLIMETERS MAXIMUM MM; Fastener Length: 12.0 MILLIMETERS NOMINAL MM; Thread Pitch in Millimeters: 0.7. 12 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.