The Screw,machine, cataloged under National Stock Number 5305-01-693-4053, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-693-4053 |
| Primary Part Number | H185B4-6R |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.063 INCHES NOMINAL IN |
| Screw Surface Treatment | ALUMINUM |
| Fastener Length | 0.778 INCHES NOMINAL IN |
| Screw Material Document and Classification | AMS-6487 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Length | 0.375 INCHES NOMINAL IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL COMP H11 |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORQUE SET |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.00 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.399 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | MIL-C-83488 TYPE II, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| 121558-4-A6BX | Sps Technologies, Llc Dba PB Fasteners (USA) |
| H185B4-6R PRIMARY | Huck International, Inc (USA) |
| AIC985B4-6R PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VT1694AS4-6X | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| VT1694AS4-6X | 3/2 Design control — primary reference U.S. Government activity |
| AIC985-4-6BR | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| IAC985-4-6BR | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| 121558-46BX | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| C7985B4-6R | 7/2 Vendor item drawing reference U.S. Government activity |
| 121558-4-A6BX | 3/2 Design control — primary reference U.S. Government activity |
| 121558-46BX | 5/9 Secondary reference U.S. Government activity |
| C7985 | D/9 Drawing number reference only U.S. Government activity |
NSN 5305-01-693-4053 is a Screw,machine, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-693-4053 has 4 manufacturer part numbers on file: 121558-4-A6BX (Sps Technologies, Llc Dba PB Fasteners), H185B4-6R (Huck International, Inc), AIC985B4-6R (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VT1694AS4-6X (Howmet Global Fastening Systems Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5305-01-693-4063, 5305-01-693-4084, 5305-01-693-4093. Verify interchangeability with system specifications before substitution.
Key specifications for H185B4-6R: Head Height: 0.063 INCHES NOMINAL IN; Screw Surface Treatment: ALUMINUM; Fastener Length: 0.778 INCHES NOMINAL IN; Screw Material Document and Classification: AMS-6487 ASSN STD SINGLE MATERIAL RESPONSE. 18 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.