[Gear Couplings Inner hubs(GC)] Series list    mating gears :  Gear Couplings (GC-I)
diagram
Specifications
Gear teeth Standard full depth (Inner hubs are Crouwning) Surface treatment Trivalent Chromate plating
Pressure angle 20° Surface finish Cut
Material S45C Datum reference surface for teeth cutting Bore (H8)(Outer ring is Outside diameter)
Heat treatment Tooth surfaces induction hardened Modifications Possible
Surface hardness HRC50 - 60    
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Catalog No.
Module No. of teeth Shape Bore
A
Hub dia.
B
Pitch dia.
C
Outside dia.
D
Face width
E
Hub width
F
Total length
G
Screw Threaded hole
J
K L M Total Length
N
Keyway Width Keyway Depth Allowable shear strength of keyways (kgf·m) Backlash low
(mm)
Backlash up
(mm)
Weight
(kg)
Unit Price
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  GC1-12S 
  GC1-20 
  GC1-22 
  GC1-25 
  GC2-20S 
  GC2-30 
  GC2-32 
  GC2-35 
  GC2-40 
  GC3-20S 
  GC3-45 
  GC3-50 
225T212455054102535  231.9542.573   0.400.600.43 
225TK20455054102535M510231.9542.57352.370.400.600.37 
225TK22455054102535M610231.9542.57373100.400.600.35 
225TK25455054102535M610231.9542.57373140.400.600.32 
240T220708084154055  372.767115   0.400.601.66 
240TK30708084154055M613372.76711573250.400.601.48 
240TK32708084154055M1013372.767115103.3300.400.601.42 
240TK35708084154055M1013372.767115103.3400.400.601.36 
240TK40708084154055M1013372.767115103.3500.400.601.23 
2.542T22090105110204565  423.286.5135   0.400.603.43 
2.542TK4590105110204565M1020423.286.5135123.3800.400.602.74 
2.542TK5090105110204565M1020423.286.5135123.3900.400.602.56 
Product Precautions
[Caution on Product Characteristics]  ①S-type products are of minimum bore products. Keyways are made according to JIS B1301 standards, Js 9 tolerance.
 ②For products with a snap ring and a tapped hole, a set screw is included as an accessory.
 ③The allowable torque in the table is obtained from the shear strength of the keyways. The shear strength of a keyway is assumed to be 49 MPa(5kgf/mm2).
 ④Since Uni-chromate treatment is applied, there may be some changes in dimensions of bore, keyway etc., decreasing by a few μm.

[Caution on Secondary Operations]  ①Due to gear teeth induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 2 to 3 mm).
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