[Spiral Miter Gears (MMSA·MMSB)] Series list   
diagram
Specifications
Precision grade JIS B 1704:1978 grade 4 Surface hardness HRC55 - 60
Gear teeth Gleason Surface treatment -
Pressure angle 20° Surface finish Cut
Helix angle 35° Datum reference surface for teeth cutting Bore (H7)
Material SCM415 Modifications Not possible
Heat treatment Overall carburizing    
  1 / 1 Page      40 items in total    Module   No. of Teeth       
< 1 >    precaution    
Catalog No.
Module
Number of Teeth
Hand of thread 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
Keyway
Width
Keyway
Depth
Thread Size Threaded hole
L
Allowable torque(kgf·m)
Bending strength
Allowable torque(kgf·m)
Surface durability
Backlash low
(mm)
Backlash up
(mm)
Weight
(kg)
Unit Price
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  MMSA1-20R 
  MMSB1-20R 
  MMSA1-20L 
  MMSB1-20L 
  MMSA1.5-20R 
  MMSB1.5-20R 
  MMSA1.5-20L 
  MMSB1.5-20L 
  MMSA2-20R 
  MMSB2-20R 
  MMSA2-20L 
  MMSB2-20L 
  MMSA2.5-20R 
  MMSB2.5-20R 
  MMSA2.5-20L 
  MMSB2.5-20L 
  MMSA3-20R 
  MMSB3-20R 
  MMSA3-20L 
  MMSB3-20L 
  MMSA3.5-20R 
  MMSB3.5-20R 
  MMSA3.5-20L 
  MMSB3.5-20L 
  MMSA4-20R 
  MMSB4-20R 
  MMSA4-20L 
  MMSB4-20L 
  MMSA5-20R 
  MMSB5-20R 
  MMSA5-20L 
  MMSB5-20L 
  MMSA6-20R 
  MMSB6-20R 
  MMSA6-20L 
  MMSB6-20L 
  MMSA8-20R 
  MMSA8-20L 
  MMSA10-20R 
  MMSA10-20L 
120RBT8172021.292013.5310.648.512.24.511.67  2-M44.50.230.210.030.130.018 MMSA1-20L
120RBT10172021.292013.5310.648.512.24.511.67  2-M44.50.230.210.030.130.015 MMSB1-20L
120LBT8172021.292013.5310.648.512.24.511.67  2-M44.50.230.210.030.130.018 MMSA1-20R
120LBT10172021.292013.5310.648.512.24.511.67  2-M44.50.230.210.030.130.015 MMSB1-20R
1.520RBT10253031.92818.4813.9510.516.5717.2  2-M460.790.750.050.150.057 MMSA1.5-20L
1.520RBK12253031.92818.4813.9510.516.5717.241.82-M460.790.750.050.150.052 MMSB1.5-20L
1.520LBT10253031.92818.4813.9510.516.5717.2  2-M460.790.750.050.150.057 MMSA1.5-20R
1.520LBK12253031.92818.4813.9510.516.5717.241.82-M460.790.750.050.150.052 MMSB1.5-20R
220RBK14354042.523522.0916.2612.520924.5452.32-M471.831.760.060.160.13 MMSA2-20L
220RBK16354042.523522.0916.2612.520924.5452.32-M471.831.760.060.160.12 MMSB2-20L
220LBK14354042.523522.0916.2612.520924.5452.32-M471.831.760.060.160.13 MMSA2-20R
220LBK16354042.523522.0916.2612.520924.5452.32-M471.831.760.060.160.12 MMSB2-20R
2.520RBK18425053.24528.6321.616261130.8962.82-M583.523.440.070.170.24 MMSA2.5-20L
2.520RBK20425053.24528.6321.616261130.8962.82-M583.523.440.070.170.23 MMSB2.5-20L
2.520LBK18425053.24528.6321.616261130.8962.82-M583.523.440.070.170.24 MMSA2.5-20R
2.520LBK20425053.24528.6321.616261130.8962.82-M583.523.440.070.170.23 MMSB2.5-20R
320RBK20526063.995030.7821.9916271434.462.82-M586.326.230.080.180.40 MMSA3-20L
320RBK22526063.995030.7821.9916271434.462.82-M586.326.230.080.180.39 MMSB3-20L
320LBK20526063.995030.7821.9916271434.462.82-M586.326.230.080.180.40 MMSA3-20R
320LBK22526063.995030.7821.9916271434.462.82-M586.326.230.080.180.39 MMSB3-20R
3.520RB425507074.535532.4522.2614291642.7583.32-M689.909.860.100.250.46 MMSA3.5-20L
3.520RB428507074.535532.4522.2614291642.7583.32-M689.909.860.100.250.43 MMSB3.5-20L
3.520LB425507074.535532.4522.2614291642.7583.32-M689.909.860.100.250.46 MMSA3.5-20R
3.520LB428507074.535532.4522.2614291642.7583.32-M689.909.860.100.250.43 MMSB3.5-20R
420RB428558084.996539.1327.517351849.0883.32-M6914.614.70.120.270.70 MMSA4-20L
420RB430558084.996539.1327.517351849.0883.32-M6914.614.70.120.270.68 MMSB4-20L
420LB428558084.996539.1327.517351849.0883.32-M6914.614.70.120.270.70 MMSA4-20R
420LB430558084.996539.1327.517351849.0883.32-M6914.614.70.120.270.68 MMSB4-20R
520RB43070100106.257542.9928.1317382360.9583.32-M6929.029.40.140.341.32 MMSA5-20L
520RB43570100106.257542.9928.1317382360.95103.32-M8929.029.40.140.341.25 MMSB5-20L
520LB43070100106.257542.9928.1317382360.9583.32-M6929.029.40.140.341.32 MMSA5-20R
520LB43570100106.257542.9928.1317382360.95103.32-M8929.029.40.140.341.25 MMSB5-20R
620RB44080120127.599051.1333.820452773.63123.32-M81048.450.60.160.362.11 MMSA6-20L
620RB44580120127.599051.1333.820452773.63143.82-M101048.450.60.160.361.99 MMSB6-20L
620LB44080120127.599051.1333.820452773.63123.32-M81048.450.60.160.362.11 MMSA6-20R
620LB44580120127.599051.1333.820452773.63143.82-M101048.450.60.160.361.99 MMSB6-20R
820RB780 160 1004529.16 4035101  6-M101101111190.200.453.98 MMSA8-20L
820LB780 160 1004529.16 4035101  6-M101101111190.200.453.98 MMSA8-20R
1020RB7100 200 1255836.48 5045122.72  6-M101301691880.250.507.88 MMSA10-20L
1020LB7100 200 1255836.48 5045122.72  6-M101301691880.250.507.88 MMSA10-20R
Product Precautions
[Caution on Product Characteristics]  ①A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands.
 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.
 ④These gears produce axial thrust forces. See precaution for more details.
 ⑤Although the dimensions of the keyway are made to the JIS (Js9) tolerance, there may be some deviations due to the effects of heat treatment.
 ⑥For products with a tapped hole, a set screw is included as an accessory.
 ⑦Starting from Jan 2012, B4-, BK-, and BT-shaped products are improved sequentially, and the revised products are to have two tapped holes.

[Caution on Secondary Operations]  ①These products which are hardened by carburizing allow no secondary machining. However, for B7 type gear, the area surrounded with -- - - -- line (in the illustration) is masked during the carburization process and can be modified. Care should be exercised since the hardness is high (approx. HRC40, maximum).
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