The Screw,close Tolerance, cataloged under National Stock Number 5305-01-513-9637, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 17 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-513-9637 |
| Primary Part Number | HT4027-4-5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 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 | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| WC4027-4-5 | West Coast Aerospace, Inc. (USA) |
| ST3M557-4-5 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M557-4-5 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4027-4-5 | Howmet Global Fastening Systems Inc (USA) |
| ST3M557-4-5 | Houston Precision Fasteners I Lp (USA) |
| ST3M557-4-5 | Heartland Precision Fasteners Inc (USA) |
| HT4027-4-5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4027-4-5 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M557-4-5 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M557-4-5 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M557-4-5 | Linread Ltd (GBR) |
| HT4027-4-5 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M557-4-5 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M557-4-5 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M557-4-5 | Huck International, Inc (USA) |
| ST3M557-4-5 | Camcar Llc Div Camcar Llc (USA) |
| ST3M557-4-5 | Saturn Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M557 | D/9 Drawing number reference only The Boeing Company Div Defense |
| HT4027-4-5 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-4-5 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M557-4-5 | 5/2 Secondary reference U.S. Government activity |
| ST3M557-4-5 | 5/9 Secondary reference Continuum Energy Services, L.l.c. |
NSN 5305-01-513-9637 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-513-9637 has 17 manufacturer part numbers on file: WC4027-4-5 (West Coast Aerospace, Inc.), ST3M557-4-5 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M557-4-5 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), HT4027-4-5 (Howmet Global Fastening Systems Inc), ST3M557-4-5 (Houston Precision Fasteners I Lp) and 12 more.
Key specifications for HT4027-4-5: Fastener Length: 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.469 INCHES NOMINAL IN; Material Document and Classification: AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 17 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.