The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-9230, 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 20 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-494-9230 |
| Primary Part Number | ST3M652C5-18D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Fastener Length | 1.620 INCHES MINIMUM AND 1.707 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.505 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.575 INCHES MINIMUM AND 0.635 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 |
|---|---|
| HT4020-5-18A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4020-5-18 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| 11925C5-18A | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M652C5-18A | Houston Precision Fasteners I Lp (USA) |
| HT4020-5-18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C5-18D | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M652C5-18A | Heartland Precision Fasteners Inc (USA) |
| HT4020-5-18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C5-18A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4020-5-18 | Hi-Shear Corporation (USA) |
| HT4020-5-18A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4020-5-18A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-5-18A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4020-5-18 | Huck International, Inc (USA) |
| ST3M652C5-18D | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| WC4020-5-18 | West Coast Aerospace, Inc. (USA) |
| ST3M652C5-18D PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4020-5-18 | 5/9 Secondary reference Sps Technologies Inc |
| HT4020-5-18 | 5/2 Secondary reference U.S. Government activity |
| HT4020-5-18 | 5/9 Secondary reference U.S. Government activity |
| HT4020-5-18 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-494-9230 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-9230 has 17 manufacturer part numbers on file: HT4020-5-18A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4020-5-18 (Sps Technologies Ltd, Tj Brooks Division), 11925C5-18A (Reid Products Inc. Dba Reid Products Inc), ST3M652C5-18A (Houston Precision Fasteners I Lp), HT4020-5-18 (Howmet Global Fastening Systems Inc) and 12 more.
Key specifications for ST3M652C5-18D: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.088 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Fastener Length: 1.620 INCHES MINIMUM AND 1.707 INCHES MAXIMUM IN. 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.