The Screw,close Tolerance, cataloged under National Stock Number 5305-01-033-5220, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-033-5220 |
| Primary Part Number | HT4049-4D12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Fastener Length | 1.051 INCHES MINIMUM AND 1.081 INCHES MAXIMUM IN |
| Thread Length | 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | 23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.113 INCHES MINIMUM AND 0.123 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM 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 |
|---|---|
| HT4049-4D12 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11931-4D12 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4049-4D12 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4049-4D12 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4049-4D12 | 3/2 Design control — primary reference U.S. Government activity |
| HT4049-4D12 | 7/2 Vendor item drawing reference Huck International, Inc |
| HT4049-4D12 | 5/9 Secondary reference U.S. Government activity |
| HT4049-4D12 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4049-4D12 | 5/9 Secondary reference U.S. Government activity |
| ST3M714-4D12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-033-5220 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-033-5220 has 4 manufacturer part numbers on file: HT4049-4D12 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 11931-4D12 (Reid Products Inc. Dba Reid Products Inc), HT4049-4D12 (Howmet Global Fastening Systems Inc), HT4049-4D12 (Hi-Shear Corporation).
Key specifications for HT4049-4D12: Fastener Length: 1.051 INCHES MINIMUM AND 1.081 INCHES MAXIMUM IN; Thread Length: 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN; Material Document and Classification: 23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL. 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.