Planetary Gearboxes

SB Series Planetary Gearboxes

The SB Series is a high-precision planetary gearbox line designed for servo motor applications. Built with precision-cut metal geartrains, full needle bearings, and optimized gear geometry, SB reducers deliver quiet operation, high torque density, and long service life in a compact cylindrical form factor.

Available in frame sizes 042, 060, 090, 115, 142, 180, and 220 with single-stage and multi-stage reduction ratios from 3:1 to 100:1. Rated output torque ranges from 19 Nm (042SB at 3:1) to 1,140 Nm (220SB at 3:1).

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SB Series 042 planetary gearbox, front view

Key Features

check_circleSuper precision backlash P0: ≤1 arcmin (3:1–10:1 ratios)
check_circlePrecision backlash P1: ≤3 arcmin
check_circleStandard backlash P2: ≤5–7 arcmin
check_circleEfficiency ≥97% (single stage, 3:1–10:1 ratios)
check_circleRated input speed: 3,000 rpm standard / 6,000 rpm high speed
check_circleProtection class IP65 with synthetic lubricating grease
check_circleMounting in any direction
check_circleOperating temperature −10°C to +90°C
check_circleContinuous service life rated at 20,000 hours
check_circleNoise ≤56–70 dB(A) at 3000 rpm no load depending on frame size

Frame Size Specifications

Key performance data per frame size. All values based on catalog-rated conditions.

Frame Size	Flange ⌀	Body Length	Rated Torque Range	Weight	Noise Level
042	50 mm	42 mm	14–22 Nm	0.6 kg	≤56 dB(A)
060	70 mm	60 mm	40–60 Nm	1.3 kg	≤58 dB(A)
090	100 mm	90 mm	100–160 Nm	3.7 kg	≤60 dB(A)
115	130 mm	115 mm	208–330 Nm	7.8 kg	≤63 dB(A)
142	165 mm	142 mm	342–650 Nm	14.5 kg	≤65 dB(A)
180	215 mm	180 mm	588–1,200 Nm	29 kg	≤67 dB(A)
220	250 mm	220 mm	1,140–2,000 Nm	48 kg	≤70 dB(A)