The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-372-4279, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Oil States Industries, Inc. Div Special Products Div. Government technical data includes 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-372-4279 |
| Primary Part Number | NB3961 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Oil States Industries, Inc. Div Special Products Div |
| Status | ACTIVE |
| Width Across Flats | 0.625 INCHES NOMINAL IN |
| Head Height | 0.750 INCHES NOMINAL IN |
| Fastener Length | 1.440 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Thread Length | 1.500 INCHES MAXIMUM IN |
| Hardness Rating | 37.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM FASTENER |
| Material Document and Classification | ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | KNURLED NO. 1 |
| Thread Direction | RIGHT-HAND |
| Nondefinitive Spec/std Data | 2 TYPE AND A574 GRADE |
| Locking Feature | PELLET THREADS |
| Minimum Tensile Strength | 170000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 153000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 10 |
| Material | STEEL UNS K03104 FASTENER |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.125 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 |
|---|---|
| NB3961 PRIMARY | Oil States Industries, Inc. Div Special Products Div (USA) |
| ND3955 ITEM 7 | Oil States Industries, Inc. Div Special Products Div (USA) |
| Reference | Meaning |
|---|---|
| 0.75010UNC3A1.5 00T2G574SEB | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| MIL-S-1222 | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-1222 | 4/1 Identification reference U.S. Government activity |
NSN 5305-01-372-4279 is a Screw,cap,socket Head, manufactured by Oil States Industries, Inc. Div Special Products Div, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-372-4279 has 2 manufacturer part numbers on file: NB3961 (Oil States Industries, Inc. Div Special Products Div), ND3955 ITEM 7 (Oil States Industries, Inc. Div Special Products Div).
Key specifications for NB3961: Width Across Flats: 0.625 INCHES NOMINAL IN; Head Height: 0.750 INCHES NOMINAL IN; Fastener Length: 1.440 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN; Thread Length: 1.500 INCHES MAXIMUM IN. 20 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.