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HDRF206-H cross-reference: 20YF, HF921, HF721, QH206 | Replacement Intelligence

Manufacturer-published cross-reference

HDRF206-H

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 row11

Publisher targetWorldWide ElectricHDRF206-H

Published comparisonAlling Lander20YF

Published comparisonBaldorHF921

Published comparisonBoston GearHF721

Published comparisonBrowning RaiderQH206

Published comparisonFalk Omnibox1206WBQM

Published comparisonGrove Gear (new)HMQ220

Published comparisonGrove Gear (old)HMQ1206

Published comparisonLeesonHMQ621

Published comparisonMorse Raider721SF

Published comparisonOhio GearSM2206MQ

What the evidence supportsClaim scope

WorldWide Electric's HD Cast Iron competitive interchange table publishes HDRF206-H at 2.06 in center distance for C-face input / hollow-bore 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 HDRF206-H 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 ElectricHDRF206-HHDR 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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