The Pulley,flat, cataloged under National Stock Number 3020-00-418-4838, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Kell-Strom Tool International, Inc.. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-418-4838 |
| Primary Part Number | ST90455 |
| Item Name | Pulley,flat |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Kell-Strom Tool International, Inc. |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 1.500 INCHES NOMINAL AA END IN |
| Distance From Pilot End to Flange Face | 2.125 INCHES NOMINAL IN |
| Bore Feature | INCLUDED |
| Securing Method | THREADED HOLE(S) |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 3.500 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Flange Quantity | 1 |
| Outside Diameter | 0.937 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Material Document and Classification | AISI OR SAE 4130 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.500 INCHES NOMINAL IN |
| Rim Type | SOLID |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Distance From Center of Bore to Bottom of Keyway | 0.501 INCHES NOMINAL IN |
| Securing Hole Quantity | 1 |
| Thread Size | 5/16-18 |
| Keyway Width | 0.188 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM |
| Keying Facility | INCLUDED |
| Hole Location | ON TOP OF KEYWAY 1.375 IN. FROM HUB END IN |
| Flange Width | 0.125 INCHES NOMINAL IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.752 INCHES MINIMUM AND 0.753 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 |
|---|---|
| ST90455 PRIMARY | Kell-Strom Tool International, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST90455 | 5/9 Secondary reference Rtx Corporation Div Pratt & Whitney |
NSN 3020-00-418-4838 is a Pulley,flat, manufactured by Kell-Strom Tool International, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-418-4838 has 1 manufacturer part number on file: ST90455 (Kell-Strom Tool International, Inc.).
Key specifications for ST90455: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 1.500 INCHES NOMINAL AA END IN; Distance From Pilot End to Flange Face: 2.125 INCHES NOMINAL IN; Bore Feature: INCLUDED. 28 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.