The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-00-043-5491, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Siemens Energy, Inc. Dba Dresser-Rand. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-00-043-5491 |
| Primary Part Number | 3W21297 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Siemens Energy, Inc. Dba Dresser-Rand |
| Status | ACTIVE |
| Head Height | 0.234 INCHES NOMINAL IN |
| Fastener Length | 0.875 INCHES NOMINAL IN |
| Thread Length | 0.875 INCHES MAXIMUM IN |
| Hardness Rating | 100.0 ROCKWELL B MAXIMUM OVERALL |
| Hole Configuration Style | HEXAGON FLATS |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Departure From Cited Document | AS MODIFIED BY DRILLED HOLE |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | II TYPE AND 10P STYLE AND 2 GRADE |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Minimum Tensile Strength | 69000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Hole Type | DRILLED |
| Hole Diameter | 0.070 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 |
|---|---|
| S/95101911 | Ditta Seguino Ambrogio (ITA) |
| 3W21297 PRIMARY | Siemens Energy, Inc. Dba Dresser-Rand (USA) |
| N462SH4PC33 PRIMARY | Siemens Energy, Inc. Dba Dresser-Rand (USA) |
| Reference | Meaning |
|---|---|
| 435491 | 5/9 Secondary reference General Motors Corp |
| 3W21297 | 5/9 Secondary reference Ingersoll Rand Co |
| 3W21297 | 5/9 Secondary reference U.S. Government activity |
| FFS85TYPE2STYLE10PGRADE2 | 4/1 Identification reference U.S. Government activity |
| N462SH4PC33 | 5/9 Secondary reference U.S. Government activity |
| N462SH4PC33 | 5/9 Secondary reference Ingersoll Rand Co |
| 435491 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5305-00-043-5491 is a Screw,cap,hexagon Head, manufactured by Siemens Energy, Inc. Dba Dresser-Rand, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-043-5491 has 3 manufacturer part numbers on file: S/95101911 (Ditta Seguino Ambrogio), 3W21297 (Siemens Energy, Inc. Dba Dresser-Rand), N462SH4PC33 (Siemens Energy, Inc. Dba Dresser-Rand).
3 possible matches (shared part number, not a government interchangeability claim): 5998-01-029-9846, 5895-01-178-0520, 6685-01-422-3494. Verify interchangeability with system specifications before substitution.
Key specifications for 3W21297: Head Height: 0.234 INCHES NOMINAL IN; Fastener Length: 0.875 INCHES NOMINAL IN; Thread Length: 0.875 INCHES MAXIMUM IN; Hardness Rating: 100.0 ROCKWELL B MAXIMUM OVERALL. 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.