The Screw,close Tolerance, cataloged under National Stock Number 5305-01-133-1572, 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 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-133-1572 |
| Primary Part Number | ST3M557-4-4 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Material Document and Classification | 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| 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 CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.390 INCHES MINIMUM AND 0.395 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 |
|---|---|
| HT4027-4-4 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-4-4 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-4-4 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4027-4-4 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-4-4 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4027-4-4 | Hi-Shear Corporation (USA) |
| HT4027-4-4 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| WC4027-4-4 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4027-4-4 | 5/9 Secondary reference Huck International, Inc |
| HT4027-4-4 | 5/9 Secondary reference U.S. Government activity |
| 10115341 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4027-4-4 | 5/9 Secondary reference U.S. Government activity |
| HT4027-4-4 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-133-1572 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-133-1572 has 8 manufacturer part numbers on file: HT4027-4-4 (Howmet Global Fastening Systems Inc), ST3M557-4-4 (Fastener Innovation Technology, Inc. Dba F I T), ST3M557-4-4 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), HT4027-4-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M557-4-4 (The Boeing Company Div Defense) and 3 more.
Key specifications for ST3M557-4-4: Fastener Length: 0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN; Thread Length: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN; Material Document and Classification: 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.250 INCHES IN. 15 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.