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Boston Gear F721-10-B5-G replacement & specifications | Replacement Intelligence

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Boston Gear

F721-10-B5-G

unknown

Grainger-documented Boston Gear 700 Series C-face worm reducer with 10:1 ratio, 56C motor frame and 1-inch output shaft. Record source ↗

Source-backed record · Last reviewed Sep 21, 2026Compare this model →Verification methodology →

Specifications

Known configuration

6 fields

Gear ratio: 10 :1Source ↗
Maximum input power: 1 hpSource ↗
Maximum output speed: 175 rpmSource ↗
Maximum output torque: 320 in-lbSource ↗
Motor frame: 56CSource ↗
Output shaft diameter: 1 inSource ↗

Cross-reference

Replacement candidates

No verified one-to-one replacement relationship yet.

Manufacturer transition notices are kept separate from exact compatibility so a group-level product transition is never presented as a drop-in replacement.

Interchange check

What must match before substitution

6 checks

Ratio / speedConfirm the replacement produces the required output speed at the actual input speed.

Torque / dutyVerify continuous and peak torque, service factor, shock loading, starts per hour, and thermal duty.

Output geometryMatch shaft or bore diameter, key/spline/bushing, output side, usable length, and allowable overhung/thrust loads.

MountingCheck foot pattern, flange pilot/bolt circle, center height, torque arm, and mounting position.

Input / motorConfirm motor frame, adapter, input shaft or quill, power, brake, encoder, voltage, and frequency.

EnvironmentVerify lubricant, washdown/corrosion requirements, temperature, ingress protection, and hazardous-area needs.

Sourcing

Verified channels listing Boston Gear

GraingerGrainger lists current Boston Gear reducer configurations with model-level dimensional and performance fields.

Coverage evidence ↗

Coverage means we verified a current merchant listing or catalog reference for the brand. Confirm stock, lead time, authorization status, and the exact configuration directly with the supplier.