The Screw,close Tolerance, cataloged under National Stock Number 5305-01-173-3587, 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 12 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-173-3587 |
| Primary Part Number | ST3M652C4-5A |
| 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 | 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN |
| Fastener Length | 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 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 | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.456 INCHES MINIMUM AND 0.508 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 |
|---|---|
| ST3M652C4-5A | Heartland Precision Fasteners Inc (USA) |
| WC4020-4-5A | West Coast Aerospace, Inc. (USA) |
| ST3M652C4-5A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M652C4-5A PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M652C4-5A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C4-5A | Houston Precision Fasteners I Lp (USA) |
| ST3M652C4-5A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 11925C4-5A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-4-5A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4020-4-5A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4020-4-5A | Hi-Shear Corporation (USA) |
| HT4020-4-5A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-5A | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-5A | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4020-4-5A | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-5A | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| HT4020-4-5A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| ST3M652C4-5A | 5/9 Secondary reference Ni Industries Inc Thermador/waste King Div |
| HT4020-4-5A | 5/9 Secondary reference U.S. Government activity |
| ST3M652C4-5 | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 5305-01-173-3587 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-173-3587 has 12 manufacturer part numbers on file: ST3M652C4-5A (Heartland Precision Fasteners Inc), WC4020-4-5A (West Coast Aerospace, Inc.), ST3M652C4-5A (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M652C4-5A (The Boeing Company Div Defense), ST3M652C4-5A (Sps Technologies Ltd, Tj Brooks Division) and 7 more.
Key specifications for ST3M652C4-5A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN; Fastener Length: 0.765 INCHES MINIMUM AND 0.812 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.