Bosch GBG 35-15 vs GBG 60-20: which bench grinder fits your work?

The main specifications side by side

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Input power is the electrical input rating. It does not tell you how quickly a grinder will remove material or how fine the finish will be. Match the actual machine’s nameplate to the supply, and check its marked maximum speed before choosing a wheel.

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Which model suits your work?

GBG 35-15: choose it when the 150 × 20 × 20 mm wheel format suits your sharpening or metalworking needs. Keep the 20 mm wheel bore separate from mounting-flange dimensions; alternative bore entries in a family manual are not permission to adapt a wheel.

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GBG 60-20: choose it when you specifically need the larger 200 × 25 × 32 mm wheel format. Its higher input rating does not establish a larger workpiece capacity or suitability for every material. Its 32 mm wheel bore is distinct from the manual’s separate 15 mm mounting-flange bore.

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Wheel selection and safe use

The two wheel formats are not interchangeable. Use the exact diameter, width, bore and material specification required for your machine. The wheel’s rated speed must be at least the maximum speed marked on the tool. Do not enlarge a bore, substitute flanges or fit an angle-grinder disc.

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Keep the correct workpiece supports, guards and spark arrestors fitted. The wheel-to-workpiece-support gap and the wheel-to-spark-arrestor-holder gap must each be no more than 2 mm. Check these regularly, do not swap left and right supports, and replace a worn wheel when the holder can no longer meet the limit. Follow the full manual or get qualified help with setup.

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Check wheels for damage and follow the manual’s pre-use no-load check, keeping people away from the wheel plane. Do not use a damaged, untrue or vibrating wheel, grind on its side or exceed the specified wheel diameter. The manual requires grinding tools on both spindles; do not run the machine with an exposed spindle.

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Wear the required eye, hearing and task-appropriate protection. Keep people and combustible materials clear of sparks and follow the manual’s dust precautions. For carbide workpieces, the manual specifies silicon-carbide C grinding discs; a generic metal wheel or matching diameter alone is not enough.

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Respect the maximum 60-minute S2 operating period and allow the machine to cool afterward. Do not start back-to-back cycles without cooling; the manual does not give a fixed cooling interval.

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Unplug before work on the tool. Use a properly earthed supply and qualified repair; have Bosch or an authorised service centre replace a damaged supply cord. Read the complete instructions for your machine before installation, wheel changes or use.

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GBG 35-15 questions

GBG 60-20 questions

Comparison questions

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GBG 35-15

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GBG 60-20

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Compared using Bosch India specifications. Reviewed 11 October 2026.