[Ring Gears (SIR)] Series list   
diagram
Specifications
Precision grade JIS B 1702-1 grade N9 (*1) Surface hardness (less than HB194)
Gear teeth Standard full depth Surface treatment Black oxide
Pressure angle 20° Surface finish Cut
Material S45C Datum reference surface for teeth cutting Outside diameter
Heat treatment - Modifications Possible
(*1) Old JIS B 1702 grade 5
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Catalog No.
Module
No. of teeth
Shape Outside dia.
A
Pitch dia.
C
Outside dia. of ring
D
Face width
E
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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  SIR2-120 
  SIR2-200 
  SIR2.5-120 
  SIR2.5-200 
  SIR3-120 
  SIR3-160 
2120T12362402862042.17.020.170.372.98 
2200T13964004462069.011.20.200.414.80 
2.5120T12953003552582.314.00.190.415.55 
2.5200T14955005552513522.50.220.468.94 
3120T13543604243014224.90.220.459.28 
3160T14744805443018832.10.220.4512.1 
Product Precautions
[Caution on Product Characteristics]  ①The backlash values shown in the table are the theoretical values for the normal direction for a pair of identical SS Spur Gears with 30 teeth in mesh.
 ②The allowable torques shown in the table are calculated values according to the assumed usage conditions. Please see precaution for more details.
 ③Please check for the involute interference, trochoid interference and trimming interference prior to using internal gears.

[Caution on Secondary Operations]  ①Please read “Cautions on Performing Secondary Operations”when performing modification and/or secondary operations of Internal Gears. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available.
 ②Avoid performing secondary operations that narrow the tooth width. as it affects precision and strength.
  Please click here to Unit Price & Delivery Time.