SPG KSR Standard Solid Shaft Low-Backlash Reducers (6E-450E)

SPG KSR series standard solid shaft cycloidal reducer, frames 6E to 450E, rated output torque 6-450 kgf-m.

Key features

Solid shaft type with coaxial input and output
2-stage reduction (spur gear + cycloid disc)
Low backlash (1 arcmin class) for robot joints and indexing
High output torque and high stiffness
Ratios per frame exactly as the coding chart lists them

Specifications

Model form	KSR-<frame>E-<ratio>
Reducer principle	Cycloid disc with crank shafts, 2-stage
Rated output speed	15 rpm (6E: 30 rpm)
Backlash	1 arcmin (6E: 1.5 arcmin)
Angular transmission accuracy	60 arcsec (6E, 20E: 80 arcsec)
Moment rigidity	12-760 kgf-m/arcmin
Lubrication	Grease (not filled at shipment)
Source	SPG KSR Low Backlash Reducer catalog, p. 5, 6-7

KSR-6E-31		Frame: 6E \| Ratio: 31 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-6E-43		Frame: 6E \| Ratio: 43 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-6E-53.5		Frame: 6E \| Ratio: 53.5 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-6E-59		Frame: 6E \| Ratio: 59 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-6E-79		Frame: 6E \| Ratio: 79 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-6E-103		Frame: 6E \| Ratio: 103 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
KSR-20E-57		Frame: 20E \| Ratio: 57 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-20E-81		Frame: 20E \| Ratio: 81 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-20E-105		Frame: 20E \| Ratio: 105 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-20E-121		Frame: 20E \| Ratio: 121 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-20E-141		Frame: 20E \| Ratio: 141 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-20E-161		Frame: 20E \| Ratio: 161 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
KSR-40E-57		Frame: 40E \| Ratio: 57 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-40E-81		Frame: 40E \| Ratio: 81 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-40E-105		Frame: 40E \| Ratio: 105 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-40E-121		Frame: 40E \| Ratio: 121 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-40E-153		Frame: 40E \| Ratio: 153 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80E-57		Frame: 80E \| Ratio: 57 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
KSR-80E-81		Frame: 80E \| Ratio: 81 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
KSR-80E-101		Frame: 80E \| Ratio: 101 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
KSR-80E-121		Frame: 80E \| Ratio: 121 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
KSR-80E-153		Frame: 80E \| Ratio: 153 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
KSR-110E-81		Frame: 110E \| Ratio: 81 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
KSR-110E-111		Frame: 110E \| Ratio: 111 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
KSR-110E-161		Frame: 110E \| Ratio: 161 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
KSR-110E-175		Frame: 110E \| Ratio: 175 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
KSR-160E-81		Frame: 160E \| Ratio: 81 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
KSR-160E-101		Frame: 160E \| Ratio: 101 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
KSR-160E-129		Frame: 160E \| Ratio: 129 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
KSR-160E-145		Frame: 160E \| Ratio: 145 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
KSR-160E-171		Frame: 160E \| Ratio: 171 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
KSR-320E-81		Frame: 320E \| Ratio: 81 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
KSR-320E-101		Frame: 320E \| Ratio: 101 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
KSR-320E-185		Frame: 320E \| Ratio: 185 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
KSR-320E-201		Frame: 320E \| Ratio: 201 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
KSR-450E-81		Frame: 450E \| Ratio: 81 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
KSR-450E-101		Frame: 450E \| Ratio: 101 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
KSR-450E-118.5		Frame: 450E \| Ratio: 118.5 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
KSR-450E-171		Frame: 450E \| Ratio: 171 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
KSR-450E-192		Frame: 450E \| Ratio: 192 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
KSR-450E-210		Frame: 450E \| Ratio: 210 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard

Cycloidal ReducersSPG

41 product codes available in this family

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SPG KSR Standard Solid Shaft Low-Backlash Reducers (6E-450E)

Brand SPG·Cycloidal Reducers

Available part numbers (41)

KSR-6E-31, KSR-6E-43, KSR-6E-53.5, KSR-6E-59, KSR-6E-79, KSR-6E-103, KSR-20E-57, KSR-20E-81, KSR-20E-105, KSR-20E-121 + 31 more — see full table ↓

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Product codes & specifications

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	Product code	Spec
	KSR-6E-31	Frame: 6E \| Ratio: 31 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-6E-43	Frame: 6E \| Ratio: 43 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-6E-53.5	Frame: 6E \| Ratio: 53.5 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-6E-59	Frame: 6E \| Ratio: 59 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-6E-79	Frame: 6E \| Ratio: 79 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-6E-103	Frame: 6E \| Ratio: 103 \| Rated torque: 6 kgf-m \| Allowable moment: 20 kgf-m \| Weight: 2.5 kg \| Availability: Consult SPG
	KSR-20E-57	Frame: 20E \| Ratio: 57 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-20E-81	Frame: 20E \| Ratio: 81 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-20E-105	Frame: 20E \| Ratio: 105 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-20E-121	Frame: 20E \| Ratio: 121 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-20E-141	Frame: 20E \| Ratio: 141 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-20E-161	Frame: 20E \| Ratio: 161 \| Rated torque: 17 kgf-m \| Allowable moment: 90 kgf-m \| Weight: 4.7 kg \| Availability: Standard
	KSR-40E-57	Frame: 40E \| Ratio: 57 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-40E-81	Frame: 40E \| Ratio: 81 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-40E-105	Frame: 40E \| Ratio: 105 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-40E-121	Frame: 40E \| Ratio: 121 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-40E-153	Frame: 40E \| Ratio: 153 \| Rated torque: 42 kgf-m \| Allowable moment: 170 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80E-57	Frame: 80E \| Ratio: 57 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
	KSR-80E-81	Frame: 80E \| Ratio: 81 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
	KSR-80E-101	Frame: 80E \| Ratio: 101 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
	KSR-80E-121	Frame: 80E \| Ratio: 121 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
	KSR-80E-153	Frame: 80E \| Ratio: 153 \| Rated torque: 80 kgf-m \| Allowable moment: 220 kgf-m \| Weight: 13.1 kg \| Availability: Standard
	KSR-110E-81	Frame: 110E \| Ratio: 81 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
	KSR-110E-111	Frame: 110E \| Ratio: 111 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
	KSR-110E-161	Frame: 110E \| Ratio: 161 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
	KSR-110E-175	Frame: 110E \| Ratio: 175 \| Rated torque: 110 kgf-m \| Allowable moment: 300 kgf-m \| Weight: 17.4 kg \| Availability: Standard
	KSR-160E-81	Frame: 160E \| Ratio: 81 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
	KSR-160E-101	Frame: 160E \| Ratio: 101 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
	KSR-160E-129	Frame: 160E \| Ratio: 129 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
	KSR-160E-145	Frame: 160E \| Ratio: 145 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
	KSR-160E-171	Frame: 160E \| Ratio: 171 \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 26.4 kg \| Availability: Standard
	KSR-320E-81	Frame: 320E \| Ratio: 81 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
	KSR-320E-101	Frame: 320E \| Ratio: 101 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
	KSR-320E-185	Frame: 320E \| Ratio: 185 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
	KSR-320E-201	Frame: 320E \| Ratio: 201 \| Rated torque: 320 kgf-m \| Allowable moment: 720 kgf-m \| Weight: 44.3 kg \| Availability: Standard
	KSR-450E-81	Frame: 450E \| Ratio: 81 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
	KSR-450E-101	Frame: 450E \| Ratio: 101 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
	KSR-450E-118.5	Frame: 450E \| Ratio: 118.5 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
	KSR-450E-171	Frame: 450E \| Ratio: 171 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
	KSR-450E-192	Frame: 450E \| Ratio: 192 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard
	KSR-450E-210	Frame: 450E \| Ratio: 210 \| Rated torque: 450 kgf-m \| Allowable moment: 900 kgf-m \| Weight: 66.4 kg \| Availability: Standard

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SPG KSR Standard Solid Shaft Low-Backlash Reducers (6E-450E)