Allows large gear ratios. Can also be used as segment gears and corner racks.
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Unit of Measure
Items
Steel Ring Gears (Spur-Gears) SSR

KHK SSR2-120, Module 2, 120 Tooth, Carbon Steel External Ring Gears
Steel Ring Gears (Spur-Gears) SSR

KHK SSR2-200, Module 2, 200 Tooth, Carbon Steel External Ring Gears
Steel Ring Gears (Spur-Gears) SSR

KHK SSR2.5-120, Module 2.5, 120 Tooth, Carbon Steel External Ring Gears
Steel Ring Gears (Spur-Gears) SSR

KHK SSR2.5-200, Module 2.5, 200 Tooth, Carbon Steel External Ring Gears
Steel Ring Gears (Spur-Gears) SSR

KHK SSR3-120, Module 3, 120 Tooth, Carbon Steel External Ring Gears
Gear Type N/A Spur Gears
Construction N/A Carbon Steel External Ring Gears
Bore Type N/A Plain
Module N/A 2 N/A 2 N/A 2.5 N/A 2.5 N/A 3
No. of Teeth N/A 120 N/A 200 N/A 120 N/A 200 N/A 120
Shape N/A S5
Bore Diameter (A) N/A 7.638 in194 mm N/A 13.937 in354 mm N/A 9.646 in245 mm N/A 17.520 in445 mm N/A 11.654 in296 mm
Pitch Diameter (C) N/A 9.449 in240 mm N/A 15.748 in400 mm N/A 11.811 in300 mm N/A 19.685 in500 mm N/A 14.173 in360 mm
Outer Diameter (D) N/A 9.606 in244 mm N/A 15.906 in404 mm N/A 12.008 in305 mm N/A 19.882 in505 mm N/A 14.409 in366 mm
Face Width (E) N/A 0.787 in20 mm N/A 0.787 in20 mm N/A 0.984 in25 mm N/A 0.984 in25 mm N/A 1.181 in30 mm
Bending Strength N/A 366 N·m37.4 kgf·m N/A 630 N·m64.3 kgf·m N/A 715 N·m72.9 kgf·m N/A 1230 N·m126 kgf·m N/A 1240 N·m126 kgf·m
Surface Durability N/A 44 N·m4.49 kgf·m N/A 84.2 N·m8.59 kgf·m N/A 88.5 N·m9.02 kgf·m N/A 169 N·m17.2 kgf·m N/A 157 N·m16 kgf·m
Backlash N/A 0.0067-0.0146 in0.17-0.37 mm N/A 0.0079-0.0161 in0.20-0.41 mm N/A 0.0075-0.0161 in0.19-0.41 mm N/A 0.0087-0.0181 in0.22-0.46 mm N/A 0.0087-0.0177 in0.22-0.45 mm
Precision Grade N/A JIS grade N9 (JIS B1702-1:1998)
Gear Teeth Type N/A Standard Full Depth
Pressure Angle N/A 20 º
Material N/A S45C (AISI 1045) Carbon Steel
Tooth Hardness N/A less than 194HB
Weight N/A 2.46 kg5.423 lb N/A 4.28 kg9.436 lb N/A 4.62 kg10.185 lb N/A 8.01 kg17.659 lb N/A 7.77 kg17.130 lb