The Pulley,groove, cataloged under National Stock Number 3020-01-171-5185, 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 Schroeder Industries Llc. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-171-5185 |
| Primary Part Number | TB-633-1 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Schroeder Industries Llc |
| Status | ACTIVE |
| Bore Feature | INCLUDED |
| Groove Shape | V |
| Standard V-Belt Section Designation for Which Designed | B |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Distance From Center of Bore to Bottom of Keyway | 1.3125 INCHES NOMINAL IN |
| Keyway Width | 0.500 INCHES NOMINAL IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 2.125 INCHES NOMINAL IN |
| Furnished Items | KEYING FACILITY |
| 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 |
|---|---|
| TB-633-1 PRIMARY | Schroeder Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| A-TB-633 | 5/9 Secondary reference Schroeder Industries Llc |
| A-TB-633 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 3020-01-171-5185 is a Pulley,groove, manufactured by Schroeder Industries Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-171-5185 has 1 manufacturer part number on file: TB-633-1 (Schroeder Industries Llc).
Key specifications for TB-633-1: Bore Feature: INCLUDED; Groove Shape: V; Standard V-Belt Section Designation for Which Designed: B; Keying Facility Type: KEYWAY. 12 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.