The Screw,close Tolerance, cataloged under National Stock Number 5305-01-237-5116, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 17 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-237-5116 |
| Primary Part Number | 3M46-4-18 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.578 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | 3-48 CAGE 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Material Document and Classification | 3-48 CAGE 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.1115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM 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) |
| Head Diameter | 0.501 INCHES MINIMUM AND 0.506 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 |
|---|---|
| HT4UA-CA-4-18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 54266-4-18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M46-4-18 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4UA-CA-4-18 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT408A-4-18 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| 3M46-4-18 | 5/2 Secondary reference U.S. Government activity |
| HT408A-4-18 | 5/9 Secondary reference U.S. Government activity |
| HTS467-4-18 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HTS467-4-18 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-237-5116 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-237-5116 has 4 manufacturer part numbers on file: HT4UA-CA-4-18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 54266-4-18 (Sps Technologies, Llc Dba PB Fasteners), 3M46-4-18 (The Boeing Company Div Defense), HT4UA-CA-4-18 (Hi-Shear Corporation).
Key specifications for 3M46-4-18: Fastener Length: 1.578 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN; Surface Treatment Document and Classification: 3-48 CAGE 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN; Material Document and Classification: 3-48 CAGE 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL. 17 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.