The Screw,close Tolerance, cataloged under National Stock Number 5305-01-521-9552, 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 3 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-521-9552 |
| Primary Part Number | ST3M557-3-24 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Material Document and Classification | BPS-F-69 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| ST3M557-3-24 | West Coast Aerospace, Inc. (USA) |
| ST3M557-3-24 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M557-3-24 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-3-24 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-3-24 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-3-24 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M557-3-24 | Hi-Shear Corporation (USA) |
| ST3M557-3-24 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| ST3M557 | D/9 Drawing number reference only The Boeing Company Div Defense |
| ST3M557-3-24 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M557-3-24 | 5/2 Secondary reference U.S. Government activity |
| HT4027-3-24 | 5/9 Secondary reference Hi-Shear Corporation |
| HT4027-3-24 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4027-3-24 | 5/9 Secondary reference U.S. Government activity |
| HT4027-3-24 | 5/9 Secondary reference Sps Technologies Inc |
| HT4027-3-24 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| WC4027-3-24 | 5/9 Secondary reference West Coast Aerospace, Inc. |
NSN 5305-01-521-9552 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-521-9552 has 8 manufacturer part numbers on file: ST3M557-3-24 (West Coast Aerospace, Inc.), ST3M557-3-24 (Sps Technologies, Llc Dba PB Fasteners), ST3M557-3-24 (Fastener Innovation Technology, Inc. Dba F I T), ST3M557-3-24 (Howmet Global Fastening Systems Inc), ST3M557-3-24 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 3 more.
Key specifications for ST3M557-3-24: Material Document and Classification: BPS-F-69 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Surface Treatment: PASSIVATE OVERALL; Part Name Assigned by Controlling Agency: NAVY SPECIAL PROJECT; Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF). 3 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.