SPG KSR Compact Low-Backlash Reducers (25A-700A)

SPG KSR series compact cycloidal reducer, frames 25A to 700A, rated output torque 25-700 kgf-m.

Key features

Compact, lightweight design with coaxial input and output
High torque type
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>A-<ratio>
Ratios	Per frame as printed on coding chart p.5
Reducer principle	Cycloid disc with crank shafts, 2-stage
Rated output speed	15 rpm
Backlash	1 arcmin
Angular transmission accuracy	50 arcsec (25A: 70, 42A: 60 arcsec)
Moment rigidity	50-900 kgf-m/arcmin
Lubrication	Grease (not filled at shipment)
Source	SPG KSR Low Backlash Reducer catalog, p. 5, 10-11

KSR-25A-41		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-25A-81		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-25A-107.6		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-25A-126		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-25A-137		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-25A-164		Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
KSR-42A-41		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-42A-81		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-42A-105		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-42A-126		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-42A-141		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-42A-164		Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
KSR-60A-41		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-60A-81		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-60A-102		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-60A-121		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-60A-145.6		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-60A-161		Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
KSR-80A-41		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80A-81		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80A-101		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80A-129		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80A-141		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-80A-161		Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
KSR-100A-41		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-100A-81		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-100A-102		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-100A-121		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-100A-141		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-100A-161		Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
KSR-125A-41		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-125A-81		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-125A-102		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-125A-121		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-125A-145.6		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-125A-161		Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
KSR-160A-41		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-160A-81		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-160A-102.8		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-160A-125.2		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-160A-156		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-160A-201		Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
KSR-500A-81		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-500A-105		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-500A-123		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-500A-144		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-500A-159		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-500A-192.7		Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
KSR-700A-105		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
KSR-700A-118		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
KSR-700A-142		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
KSR-700A-159		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
KSR-700A-183		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
KSR-700A-203		Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG

Cycloidal ReducersSPG

54 product codes available in this family

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SPG KSR Compact Low-Backlash Reducers (25A-700A)

Brand SPG·Cycloidal Reducers

Available part numbers (54)

KSR-25A-41, KSR-25A-81, KSR-25A-107.6, KSR-25A-126, KSR-25A-137, KSR-25A-164, KSR-42A-41, KSR-42A-81, KSR-42A-105, KSR-42A-126 + 44 more — see full table ↓

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Product codes & specifications

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	Product code	Spec
	KSR-25A-41	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-25A-81	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-25A-107.6	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-25A-126	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-25A-137	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-25A-164	Frame: 25A \| Rated torque: 25 kgf-m \| Allowable moment: 78 kgf-m \| Weight: 3.8 kg \| Availability: Standard
	KSR-42A-41	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-42A-81	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-42A-105	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-42A-126	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-42A-141	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-42A-164	Frame: 42A \| Rated torque: 42 kgf-m \| Allowable moment: 160 kgf-m \| Weight: 6.3 kg \| Availability: Standard
	KSR-60A-41	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-60A-81	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-60A-102	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-60A-121	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-60A-145.6	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-60A-161	Frame: 60A \| Rated torque: 60 kgf-m \| Allowable moment: 200 kgf-m \| Weight: 8.9 kg \| Availability: Standard
	KSR-80A-41	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80A-81	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80A-101	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80A-129	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80A-141	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-80A-161	Frame: 80A \| Rated torque: 80 kgf-m \| Allowable moment: 215 kgf-m \| Weight: 9.3 kg \| Availability: Standard
	KSR-100A-41	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-100A-81	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-100A-102	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-100A-121	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-100A-141	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-100A-161	Frame: 100A \| Rated torque: 100 kgf-m \| Allowable moment: 270 kgf-m \| Weight: 13 kg \| Availability: Standard
	KSR-125A-41	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-125A-81	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-125A-102	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-125A-121	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-125A-145.6	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-125A-161	Frame: 125A \| Rated torque: 125 kgf-m \| Allowable moment: 343 kgf-m \| Weight: 13.9 kg \| Availability: Standard
	KSR-160A-41	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-160A-81	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-160A-102.8	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-160A-125.2	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-160A-156	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-160A-201	Frame: 160A \| Rated torque: 160 kgf-m \| Allowable moment: 400 kgf-m \| Weight: 22.1 kg \| Availability: Standard
	KSR-500A-81	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-500A-105	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-500A-123	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-500A-144	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-500A-159	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-500A-192.7	Frame: 500A \| Rated torque: 500 kgf-m \| Allowable moment: 1000 kgf-m \| Weight: 57.2 kg \| Availability: Consult SPG
	KSR-700A-105	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
	KSR-700A-118	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
	KSR-700A-142	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
	KSR-700A-159	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
	KSR-700A-183	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG
	KSR-700A-203	Frame: 700A \| Rated torque: 700 kgf-m \| Allowable moment: 1500 kgf-m \| Weight: 102 kg \| Availability: Consult SPG

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SPG KSR Compact Low-Backlash Reducers (25A-700A)