[Spiral Bevel Gears (MBSA·MBSB)] 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      85 items in total    Module   Geer Ratio       
< 1 >    precaution    
Catalog No.
Geer Ratio 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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  MBSA2-3020R 
  MBSB2-3020R 
  MBSA2-2030L 
  MBSB2-2030L 
  MBSA2.5-3020R 
  MBSB2.5-3020R 
  MBSA2.5-2030L 
  MBSB2.5-2030L 
  MBSA3-3020R 
  MBSB3-3020R 
  MBSA3-2030L 
  MBSB3-2030L 
  MBSA4-3020R 
  MBSB4-3020R 
  MBSA4-2030L 
  MBSB4-2030L 
  MBSA5-3020R 
  MBSA5-2030L 
  MBSB5-2030L 
  MBSA6-3020R 
  MBSA6-2030L 
  MBSB6-2030L 
  MBSA2-4020R 
  MBSB2-4020R 
  MBSA2-2040L 
  MBSB2-2040L 
  MBSA2.5-4020R 
  MBSB2.5-4020R 
  MBSA2.5-2040L 
  MBSB2.5-2040L 
  MBSA3-4020R 
  MBSB3-4020R 
  MBSA3-2040L 
  MBSB3-2040L 
  MBSA4-4020R 
  MBSA4-2040L 
  MBSB4-2040L 
  MBSA5-4020R 
  MBSA5-2040L 
  MBSB5-2040L 
  MBSA6-4020R 
  MBSA6-2040L 
  MBSB6-2040L 
  MBSA2-4518R 
  MBSB2-4518R 
  MBSA2-1845L 
  MBSB2-1845L 
  MBSA2.5-4518R 
  MBSB2.5-4518R 
  MBSA2.5-1845L 
  MBSB2.5-1845L 
  MBSA3-4518R 
  MBSB3-4518R 
  MBSA3-1845L 
  MBSB3-1845L 
  MBSA4-4518R 
  MBSA4-1845L 
  MBSB4-1845L 
  MBSA5-4518R 
  MBSA5-1845L 
  MBSB5-1845L 
  MBSA6-4518R 
  MBSA6-1845L 
  MBSB6-1845L 
  MBSA2-4515R 
  MBSB2-4515R 
  MBSA2-1545L 
  MBSB2-1545L 
  MBSA2.5-4515R 
  MBSB2.5-4515R 
  MBSA2.5-1545L 
  MBSB2.5-1545L 
  MBSA3-4515R 
  MBSB3-4515R 
  MBSA3-1545L 
  MBSB3-1545L 
  MBSA4-4515R 
  MBSA4-1545L 
  MBSB4-1545L 
  MBSA5-4515R 
  MBSA5-1545L 
  MBSB5-1545L 
  MBSA6-4515R 
  MBSA6-1545L 
  MBSB6-1545L 
1.5230RB420406061.364026.821.0214231137.5662.82-M573.513.910.060.160.26 MBSA2-2030L
1.5230RB422406061.364026.821.0214231137.5662.82-M573.513.910.060.160.24 MBSB2-2030L
1.5220LBK15354043.494524.9616.1613.33231124.3452.32-M46.52.392.610.060.160.14 MBSA2-3020R
1.5220LBK18354043.494524.9616.1613.33231124.3462.82-M56.52.392.610.060.160.13 MBSB2-3020R
1.52.530RB422487576.745033.626.3118301448.0162.82-M596.937.840.070.170.52 MBSA2.5-2030L
1.52.530RB425487576.745033.626.3118301448.0183.32-M696.937.840.070.170.49 MBSB2.5-2030L
1.52.520LBK18435054.435530.0818.9815.17281431.0262.82-M57.54.735.220.070.170.26 MBSA2.5-3020R
1.52.520LBK20435054.435530.0818.9815.17281431.0262.82-M57.54.735.220.070.170.25 MBSB2.5-3020R
1.5330RB425609092.216040.3431.6621361757.1483.32-M61112.113.80.080.180.96 MBSA3-2030L
1.5330RB430609092.216040.3431.6621361757.1483.32-M61112.113.80.080.180.90 MBSB3-2030L
1.5320LBK22536065.586535.1721.8617.6732.51736.262.82-M598.239.190.080.180.46 MBSA3-3020R
1.5320LBK25536065.586535.1721.8617.6732.51736.283.32-M698.239.190.080.180.43 MBSB3-3020R
1.5430RB43575120122.917043.9932.1821392376.72103.32-M81028.933.50.120.271.77 MBSA4-2030L
1.5430RB44075120122.917043.9932.1821392376.72123.32-M81028.933.50.120.271.68 MBSB4-2030L
1.5420LBK30708087.348545.5327.4521.67422348.0783.32-M61119.722.30.120.271.03 MBSA4-3020R
1.5420LBK35708087.348545.5327.4521.67422348.07103.32-M81119.722.30.120.270.95 MBSB4-3020R
1.5530RB780 150 7035.5323.8 312897.36  6-M1011055.464.90.140.342.80 MBSA5-2030L
1.5520LBK3587100109.210555.0533.0725.67512862.04103.32-M81337.843.30.140.342.01 MBSA5-3020R
1.5520LBK4087100109.210555.0533.0725.67512862.04123.32-M81337.843.30.140.341.89 MBSA5-3020R
1.5630RB790 180 8038.8624.37 3334115.61  6-M1012094.61140.160.364.55 MBSA6-2030L
1.5620LBK45105120130.4812565.5738.4930603472.41143.82-M101564.576.00.160.363.56 MBSA6-3020R
1.5620LBK50105120130.4812565.5738.4930603472.41143.82-M101564.576.00.160.363.38 MBSA6-3020R
2240RB420458081.064531.8326.0618291452.762.82-M596.087.090.060.160.53 MBSA2-2040L
2240RB422458081.064531.8326.0618291452.762.82-M596.087.090.060.160.51 MBSB2-2040L
2220LBK15354044.25528.1616.0513.75271425.3952.32-M473.053.550.060.160.16 MBSA2-4020R
2220LBK18354044.25528.1616.0513.75271425.3962.82-M573.053.550.060.160.14 MBSB2-4020R
22.540RB42555100101.295033.3526.2916301766.9983.32-M6811.713.80.070.170.93 MBSA2.5-2040L
22.540RB42855100101.295033.3526.2916301766.9983.32-M6811.713.80.070.170.90 MBSB2.5-2040L
22.520LBK20435055.126531.0116.2813.25291729.9762.82-M575.846.890.070.170.26 MBSA2.5-4020R
22.520LBK22435055.126531.0116.2813.25291729.9762.82-M575.846.890.070.170.25 MBSB2.5-4020R
2340RB43065120121.576039.8131.5721352080.2883.32-M61119.923.70.080.181.47 MBSA3-2040L
2340RB43565120121.576039.8131.5721352080.28103.32-M81119.923.70.080.181.40 MBSB3-2040L
2320LBK22536066.038038.921.5118.2536.52036.5662.82-M59.59.9711.90.080.180.51 MBSA3-4020R
2320LBK25536066.038038.921.5118.2536.52036.5683.32-M69.59.9711.90.080.180.48 MBSB3-4020R
2440RB780 160 6032.0822.53 2827107.63  6-M1011047.557.50.120.273.11 MBSA4-2040L
2420LBK30708088.4610045.3822.1217.5432751.2583.32-M6923.828.80.120.271.05 MBSA4-4020R
2420LBK35708088.4610045.3822.1217.5432751.25103.32-M8923.828.80.120.270.96 MBSA4-4020R
2540RB790 200 7035.222.98 3034133.97  6-M1012093.31140.140.345.59 MBSA5-2040L
2520LBK4087100109.9112557.1127.4821.7553.53461.95123.32-M81146.757.00.140.341.96 MBSA5-4020R
2520LBK4587100109.9112557.1127.4821.7553.53461.95143.82-M101146.757.00.140.341.82 MBSA5-4020R
2640RB7110 240 8037.8923.62 3240162.56  6-M101401561960.160.368.48 MBSA6-2040L
2620LBK50105120132.0415067.833.0126.25644077.11143.82-M101478.197.90.160.363.33 MBSA6-4020R
2620LBK55105120132.0415067.833.0126.25644077.11164.32-M101478.197.90.160.363.11 MBSA6-4020R
2.5245RB420489090.794027.6722.9815251462.2462.82-M587.067.580.060.160.60 MBSA2-1845L
2.5245RB425489090.794027.6722.9815251462.2483.32-M687.067.580.060.160.56 MBSB2-1845L
2.5218LBK12323640.426028.5415.8814.227.51423.1141.82-M472.773.030.060.160.14 MBSA2-4518R
2.5218LBK16323640.426028.5415.8814.227.51423.1152.32-M472.773.030.060.160.12 MBSB2-4518R
2.52.545RB42555112.5113.495034.9428.7419311876.5383.32-M61014.115.30.070.171.09 MBSA2.5-1845L
2.52.545RB43055112.5113.495034.9428.7419311876.5383.32-M61014.115.30.070.171.04 MBSB2.5-1845L
2.52.518LBK15404550.357233.1916.8214.7531.51826.8252.32-M485.526.110.070.170.26 MBSA2.5-4518R
2.52.518LBK20404550.357233.1916.8214.7531.51826.8262.82-M585.526.110.070.170.22 MBSB2.5-4518R
2.5345RB43065135136.246041.6534.5522372192.9683.32-M61123.826.10.080.181.92 MBSA3-1845L
2.5345RB43565135136.246041.6534.5522372192.96103.32-M81123.826.10.080.181.84 MBSB3-1845L
2.5318LBK20485460.698537.8218.8416.3362133.4162.82-M599.3610.50.080.180.41 MBSA3-4518R
2.5318LBK25485460.698537.8218.8416.3362133.4183.32-M699.3610.50.080.180.36 MBSB3-4518R
2.5445RB780 180 5529.7721.25 2529122.33  6-M1011057.864.30.120.273.92 MBSA4-1845L
2.5418LBK28637280.8611048.0321.7718.2462945.8383.32-M61022.725.70.120.270.89 MBSA4-4518R
2.5418LBK32637280.8611048.0321.7718.2462945.83103.32-M81022.725.70.120.270.82 MBSA4-4518R
2.5545RB7100 225 6533.3722.82 2836153.85  6-M101301121260.140.346.82 MBSA5-1845L
2.5518LBK358090101.0713557.324.7120.554.53656.13103.32-M81144.250.50.140.341.68 MBSA5-4518R
2.5518LBK428090101.0713557.324.7120.554.53656.13123.32-M81144.250.50.140.341.50 MBSA5-4518R
2.5645RB7110 270 7536.9724.19 3043184.57  6-M101401902190.160.3611.1 MBSA6-1845L
2.5618LBK4595108120.5516066.7327.5122.4634366.44143.82-M101274.687.60.160.362.66 MBSA6-4518R
2.5618LBK5095108120.5516066.7327.5122.4634366.44143.82-M101274.687.60.160.362.48 MBSA6-4518R
3245RB420489090.664030.0125.9918271461.8262.82-M596.916.250.060.160.61 MBSA2-1545L
3245RB422489090.664030.0125.9918271461.8262.82-M596.916.250.060.160.60 MBSB2-1545L
3215LBT10263034.595523.7810.779.3322.51416.46  2-M452.222.080.060.160.081 MBSA2-4515R
3215LBK12263034.595523.7810.779.3322.51416.4641.82-M452.222.080.060.160.073 MBSB2-4515R
32.545RB42255112.5113.284532.4327.4218281777.8362.82-M5913.312.10.070.171.01 MBSA2.5-1545L
32.545RB42555112.5113.284532.4327.4218281777.8383.32-M6913.312.10.070.170.98 MBSB2.5-1545L
32.515LBK123237.543.067030.5114.6812.84291721.4841.82-M474.244.040.070.170.16 MBSA2.5-4515R
32.515LBK153237.543.067030.5114.6812.84291721.4852.32-M474.244.040.070.170.15 MBSB2.5-4515R
3345RB43065135136.035539.9434.0522352192.3983.32-M61123.321.60.080.181.78 MBSA3-1545L
3345RB43265135136.035539.9434.0522352192.39103.32-M81123.321.60.080.181.75 MBSB3-1545L
3315LBK183845528538.1218.6716.3336.52126.1862.82-M597.487.180.080.180.26 MBSA3-4515R
3315LBK203845528538.1218.6716.3336.52126.1862.82-M597.487.180.080.180.24 MBSB3-4515R
3445RB780 180 5028.8522.14 2528124.3  6-M1011055.351.80.120.273.93 MBSA4-1545L
3415LBK22526069.2411047.5121.5418.6745.52835.9162.82-M51017.717.30.120.270.63 MBSA4-4515R
3415LBK25526069.2411047.5121.5418.6745.52835.9183.32-M61017.717.30.120.270.58 MBSA4-4515R
3545RB790 225 6033.5725.16 2835154.88  6-M101201081020.140.347.38 MBSA5-1545L
3515LBK28657586.5513556.8924.4320.83543542.6483.32-M61134.634.10.140.341.16 MBSA5-4515R
3515LBK32657586.5513556.8924.4320.83543542.64103.32-M81134.634.10.140.341.07 MBSA5-4515R
3645RB7110 270 7038.2828.05 3242186.12  6-M101401831780.160.3612.0 MBSA6-1545L
3615LBK357890103.1316066.3927.1923634252.37103.32-M81258.659.30.160.361.90 MBSA6-4515R
3615LBK407890103.1316066.3927.1923634252.37123.32-M81258.659.30.160.361.75 MBSA6-4515R
Product Precautions
[Caution on Product Characteristics]  ①Dimensions 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.
 ②The allowable torques shown in the table are calculated values according to the assumed usage conditions. Please see precaution for more details.
 ③These gears produce axial thrust forces. See precaution for more details.
 ④Although the dimensions of the keyway are made to the JIS (Js9) tolerance, there may be some deviations due to the effects of heat treatment.
 ⑤For products with a tapped hole, a set screw is included as an accessory.
 ⑥Starting 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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