The Screw,close Tolerance, cataloged under National Stock Number 5305-01-173-3604, 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 8 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-173-3604 |
| Primary Part Number | ST3M557-3-8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.890 INCHES MINIMUM AND 0.937 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 | 0.490 INCHES MINIMUM AND 0.510 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 |
|---|---|
| HT4027-3-8 | Hi-Shear Corporation (USA) |
| ST3M557-3-8 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M557-3-8 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-3-8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4027-3-8 | West Coast Aerospace, Inc. (USA) |
| HT4027-3-8 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-3-8 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-3-8 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST3M557-3-8 | 5/9 Secondary reference Sps Technologies Inc |
| HT4027-3-8 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-3-8 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M577-3-8 | 5/9 Secondary reference Huck International, Inc |
| HT4027-3-8 | 5/9 Secondary reference Huck International, Inc |
| ST3M557-3-8 | 5/9 Secondary reference Hi-Shear Corporation |
| HT4027-3-8 | 5/9 Secondary reference U.S. Government activity |
| HT4027-3-8 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-173-3604 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-173-3604 has 8 manufacturer part numbers on file: HT4027-3-8 (Hi-Shear Corporation), ST3M557-3-8 (The Boeing Company Div Defense), ST3M557-3-8 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), HT4027-3-8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4027-3-8 (West Coast Aerospace, Inc.) and 3 more.
Key specifications for ST3M557-3-8: Fastener Length: 0.890 INCHES MINIMUM AND 0.937 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.