The Screw,close Tolerance, cataloged under National Stock Number 5305-01-173-3602, 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 16 specifications, cited from the U.S. Government catalog. The record lists 18 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-173-3602 |
| Primary Part Number | ST3M557-3-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Material Document and Classification | 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 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 | 32 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.2966 INCHES MINIMUM AND 0.3016 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 |
|---|---|
| HT4027-3-6 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-3-6 | Saturn Fasteners Inc (USA) |
| ST3M557-3-6 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-3-6 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4027-3-6 | West Coast Aerospace, Inc. (USA) |
| HT4027-3-6 | Hi-Shear Corporation (USA) |
| HT4027-3-6 | Huck International, Inc (USA) |
| ST3M557-3-6 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-3-6 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M557-3-6 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| HT4027-3-6 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-3-6 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-3-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-3-6 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4027-3-6 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-3-6 | Heartland Precision Fasteners Inc (USA) |
| 11923-3-6 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-3-6 | Houston Precision Fasteners I Lp (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-3-6 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4027-3-6 | 5/2 Secondary reference U.S. Government activity |
| HT4027-3-6 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-3-6 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M557-3-6 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| ST3M557-3-6 | 5/9 Secondary reference West Coast Aerospace, Inc. |
| HT4027-3-6 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-173-3602 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-173-3602 has 18 manufacturer part numbers on file: HT4027-3-6 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M557-3-6 (Saturn Fasteners Inc), ST3M557-3-6 (Fastener Innovation Technology, Inc. Dba F I T), HT4027-3-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4027-3-6 (West Coast Aerospace, Inc.) and 13 more.
Key specifications for ST3M557-3-6: Fastener Length: 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN; Thread Length: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN; Material Document and Classification: 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.190 INCHES IN. 16 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.