The Screw,close Tolerance, cataloged under National Stock Number 5305-01-004-9528, 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 17 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-004-9528 |
| Primary Part Number | ST3M557-3-3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.578 INCHES MINIMUM AND 0.625 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 | 0.178 INCHES MINIMUM AND 0.198 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 | 0.296 INCHES MINIMUM AND 0.301 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 |
|---|---|
| ST3M557-3-3 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-3-3 | Houston Precision Fasteners I Lp (USA) |
| HT4027-3-3 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-3-3 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M557-3-3 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-3-3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-3-3 | Heartland Precision Fasteners Inc (USA) |
| ST3M557-3-3 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4027-3-3 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-3-3 | Saturn Fasteners Inc (USA) |
| ST3M557-3-3 | Linread Ltd (GBR) |
| ST3M557-3-3 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-3-3 | Huck International, Inc (USA) |
| ST3M557-3-3 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-3-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| WC4027-3-3 | West Coast Aerospace, Inc. (USA) |
| HT4027-3-3 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 3929AS1227-3R3 | 5/2 Secondary reference U.S. Government activity |
| 11923-3-3 | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4027-3-3 | 5/2 Secondary reference U.S. Government activity |
| 10114816 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4027-3-3 | 5/2 Secondary reference U.S. Government activity |
| HT4027-3-3 | 5/9 Secondary reference U.S. Government activity |
| 3929AS1227-3R3 | C/1 Advisory reference — outside the item-of-supply concept Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 5305-01-004-9528 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-004-9528 has 17 manufacturer part numbers on file: ST3M557-3-3 (Camcar Llc Div Camcar Llc), ST3M557-3-3 (Houston Precision Fasteners I Lp), HT4027-3-3 (Howmet Global Fastening Systems Inc), ST3M557-3-3 (The Boeing Company Div Defense), ST3M557-3-3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 12 more.
Key specifications for ST3M557-3-3: Fastener Length: 0.578 INCHES MINIMUM AND 0.625 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.