IB Series PK1 Type

Low backlash and high rigidity right angle gear reducer

The most suitable for indexing with low backlash.

Compatible with servo motors manufactured by major servo motor manufacturers.

  • Right angle prestage to limit installation space
  • High torque density unit with angular ball bearings for high load capacity
  • Adaptable servo motor connection
  • Simple motor assembly with clamp ring connection
  • Compact and high rigidity


  • 6 arc min Backlash
  • 15 arc min Backlash

Output Shaft Variants:

  • Keyless solid shaft type
  • Frange shaft type
  • Solid shaft type with keyway
Industry-leading compact size

Compact size and high rigidity due to case with internal gear.
The right angle shaft PK1 type uses a spiral bevel gear on the input side, and it shortens dimension in the output shaft direction.

  L H Weight (kg)
Sumitomo 144 194 4.8
Company A 146 212 5.2
Company B 204 200 8.3

Note )

  1. ​This comparison is based on the same torque and gear system.​​
  2. It based on our survey comparison.
High accuracy and high rigidity

As high precision angular contract baring with large diameter is adopted for supporting the output shaft, these products can support large radial load with compact casing.

Compatible with various servo motors

Motor adapters are compatible with major motors produced by servo motor manufacturers.

Simple motor mounting

After direct coupling the servo motor and reducer with a bolt (prepared by customer), the input shaft is fixed by tightening the built-in clamp bolt with a torque wrench, so it can be used immediately.

Selectable output shaft type

3 type output shaft are available.
You can choose the one that best suits your application.

Point5 出力軸バリエーション

Solid shaft

Point5 出力軸バリエーション

Solid shaft
(with key)

Point5 出力軸バリエーション

Flange shaft

Related IB Series products

IB Series PE Type

Low-cost, short delivery type

Allowable peak torque
7.2 Nm - 270 Nm
64 in-lbs - 2390 in-lbs
Reduction ratio
3:1 - 81:1
15 arc min
IB Series P2 Type

Low backlash, high rigidity and high torque gear reducer

Allowable peak torque
650 Nm - 3000 Nm
Reduction ratio
4:1 - 100:1
3 arc min
Shaft configuration
IB Series - P1 Type
IB Series P1 Type

Low backlash and high rigidity gear reducer

Allowable peak torque
35 Nm - 380 Nm
Reduction ratio
3.7:1 - 81:1
3, 15 arc min
Shaft configuration