4 8V 2120 TB

Exact Stock Taper Bushed Hi-Cap wedge sheave identity and published geometry from Martin's official catalog.

Section8VGrooves4Pitch diameter21.2"OD21.2"Taper bushing4545Official source ↗

Published catalog evidence

Exact manufacturer record

D-27

Catalog number: 4 8V 2120 TB
Belt section: 8V
Groove count: 4
Pitch diameter: 21.2"
Outside diameter: 21.2"
Taper bushing: 4545
Published row: 4 8V 2120 TB 21 .2 21 .2 A-3 4545 4 .5 – 4 .5 .375 154 .0 5 8V 2120 TB A-3 4545 4 .5 – 4 .5 1 .5 195 .0

Verification boundary

Do not infer interchange

Belt and groovesConfirm exact belt section, groove count, and matched-set requirements.

Bushing and shaftVerify taper-bushing number, finished bore, shaft, keyway, and installation.

GeometryCheck pitch diameter, OD, sheave width, alignment, guard clearance, and center distance.

Drive dutyConfirm RPM, horsepower, service factor, balance, environment, and current manufacturer limits.

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