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HDRS206 cross-reference: 20U, S921, 721, U206 | Replacement Intelligence

Manufacturer-published cross-reference

HDRS206

WorldWide Electric SMR cross-table row · Match installed ratio (5:1–60:1) · AGMA unit size 2.06 in center distance

PublisherWorldWide ElectricCheckedSep 21, 2026

Claim typePublished manufacturer cross-referenceRatioMatch installed ratio (5:1–60:1)AGMA unit size2.06 in center distanceOpen source table ↗

Models printed in this source row12

Publisher targetWorldWide ElectricHDRS206

Published comparisonAlling Lander20U

Published comparisonBaldorS921

Published comparisonBoston Gear721

Published comparisonBrowning RaiderU206

Published comparisonDodge TigearS200

Published comparisonFalk Omnibox1206WB

Published comparisonGrove Gear (new)B220

Published comparisonGrove Gear (old)B1206

Published comparisonLeesonB621

Published comparisonMorse Raider721B

Published comparisonOhio GearB2206

What the evidence supportsClaim scope

WorldWide Electric's HD Cast Iron competitive interchange table publishes HDRS206 at 2.06 in center distance for shaft input / shaft output. Manufacturers marked by WorldWide as not dimensionally interchangeable are intentionally excluded from Replacement Intelligence. Match ratio, motor frame, shaft/bore and application ratings before ordering.

This page does say

These model numbers appear together in the cited manufacturer-published cross-reference row.
WorldWide Electric identifies HDRS206 as the target model in that published row.
The source associates the row with Match installed ratio (5:1–60:1) and AGMA unit size 2.06 in center distance.

This page does not say

Every competitor model listed beside each other is independently certified as pairwise interchangeable.
Every installed accessory, bushing, motor mount, backstop, shaft, or screw-conveyor component will transfer unchanged.
The cross-reference removes the need to verify application torque, mounting, environment, and configuration.

Target model recordSource-backed catalog data

WorldWide ElectricHDRS206HDR Series — Cast Iron

Open specifications →

Before treating it as a drop-in replacementVerification checklist

Ratio & speedVerify the actual ratio and required output speed.

Bushing / boreConfirm the installed shaft diameter and the required tapered bushing or bore arrangement.

AccessoriesCheck torque arm, backstop, motor mount, belt guard, screw-conveyor flange and drive shaft individually.

Torque & serviceConfirm continuous/peak torque, service factor, starts, shock load and thermal duty.

EnvelopeVerify center height, housing clearance and all mounting dimensions against the drawing.

EnvironmentConfirm lubricant, seals, ambient temperature, washdown/corrosion and hazardous-area requirements.

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