The Bolt,machine, cataloged under National Stock Number 5306-00-349-6735, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-349-6735 |
| Primary Part Number | BLT4 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| Status | ACTIVE |
| Head Height | 0.500 INCHES NOMINAL IN |
| Fastener Length | 4.688 INCHES NOMINAL IN |
| Thread Length | 0.875 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.125 INCHES NOMINAL FIRST HOLE IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.625 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 4.500 INCHES NOMINAL FIRST HOLE IN |
| Head Diameter | 0.812 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 |
|---|---|
| BLT4 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| BLT4 | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 232N | 5/9 Secondary reference U.S. Government activity |
| BLT4 | 5/9 Secondary reference U.S. Government activity |
| BLT-4 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5306-00-349-6735 is a Bolt,machine, manufactured by Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-349-6735 has 1 manufacturer part number on file: BLT4 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions).
2 possible matches (shared part number, not a government interchangeability claim): 5330-00-773-7305, 4710-01-389-4156. Verify interchangeability with system specifications before substitution.
Key specifications for BLT4: Head Height: 0.500 INCHES NOMINAL IN; Fastener Length: 4.688 INCHES NOMINAL IN; Thread Length: 0.875 INCHES NOMINAL IN; Shank Unthreaded Hole Diameter: 0.125 INCHES NOMINAL FIRST HOLE IN. 14 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.