[Plastic Miter Gears (PM)] Series list   
diagram
Specifications
Precision grade JIS B 1704:1978 grade 4 Surface hardness (HRR115 - 120)
Gear teeth Gleason Surface treatment -
Pressure angle 20° Surface finish Cut
Material MC901 Datum reference surface for teeth cutting Bore
Heat treatment - Modifications Possible
*Precision grade of this product corresponds to 'equivalent'.
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Catalog No.
Module
Number of Teeth
Shape Bore
A
Hub dia.
B
Pitch dia.
C
Outside dia.
D
Mounting distance
E
Total length
F
Crown to back length
G
Hub width
H
Length of bore
I
Face width
J
Holding surface dia.
K
Allowable torque(kgf·m)
Bending strength
Backlash low
(mm)
Backlash up
(mm)
Weight
(kg)
Unit Price
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  PM1-20 
  PM1.25-20 
  PM1.5-20 
  PM2-20 
  PM2.5-20 
  PM3-20 
  PM3.5-20 
  PM4-20 
  PM1-25 
  PM1.25-25 
  PM1.5-25 
  PM2-25 
  PM2.5-25 
  PM3-25 
120B36162021.412013.9510.7181259.860.02200.230.0028 PM1-20
1.2520B38222526.772315.2711.38913613.030.04300.240.0053 PM1.25-20
1.520B38263032.123021.2416.061319815.370.07700.250.011 PM1.5-20
220B310344042.833724.8918.4114221021.720.1800.260.023 PM2-20
2.520B312425053.544832.5424.7719291228.060.3400.270.046 PM2.5-20
320B314506064.245839.8430.1223351531.570.6000.280.080 PM3-20
3.520B320607074.956544.1332.4725401839.090.9700.300.12 PM3.5-20
420B320648085.667550.7837.8327452043.431.4200.320.17 PM4-20
125B36202526.412315.1611.21814615.030.03600.230.0051 PM1-25
1.2525B382531.2533.022817.8813.269.2516718.70.06800.240.0093 PM1.25-25
1.525B383037.539.623422.2516.3111.519919.540.1200.250.017 PM1.5-25
225B310405052.834024.3316.4110201226.060.2900.260.033 PM2-25
2.525B3145062.566.045030.4120.5212.5261534.570.5700.270.064 PM2.5-25
325B315607579.246037.8124.6215322037.431.0200.280.11 PM3-25
Product Precautions
[Caution on Product Characteristics]  ①Significant variations in temperature or humidity can cause dimensional changes in plastic gears (MC Nylon gears), for bore size (H8 when produced), teeth diameter, and backlash. Please see the section “Design of Plastic Gears” in the technical reference.
 ②The allowable torques shown in the table are calculated values according to the assumed usage conditions. Please see precaution for more details.
 ③Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips.
 ④Without lubrication, using plastic gears in pairs may generate heat and dilation.
It is recommended to mate steel gears.

[Caution on Secondary Operations]  ①Please read “Cautions on Performing Secondary Operations”when performing modification and/or secondary operations of Miter Gears. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available.
 ②Plastic gears are susceptible to the effects of temperature and moisture. Dimensional changes may occur while performing secondary operations and during post-machining operations.
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