Helpful guide for Twin Disc/Rockford PTOs: Available SAE Housing Sizes, Available Clutch Sizes, Torque Capacities & Key Dimensions

Need help sizing a Twin Disc®/Rockford power takeoff? Do you find Twin Disc PTO Model Numbers confusing? The chart below will help you. The first column “PTO Model Number” lists the available Twin Disc power takeoffs by the number of clutch plates and clutch size. In other words, Twin Disc PTO part numbers are based on the physical size of the PTO and its internal components.

SpecificationsApplication Duty Classification
Class 1Clutch Maximum HP Rating
see note 2
PTO Model
Number
Available. Sizes
SAE
Max. Input Torque
Lb. Ft.
Class IIClass IIIClass IVApprox. Weight
in LBS.
C-106SP
C-107SP
C-108SP
C-110SP
C-111SP
6,5,4
6,5,4
5,4,3
4,3,2,1
4,3,2,1
159
175
230
328
387
40
54
61
96
124
27
36
41
64
82
20
27
31
48
62
53
65
72
115
120
SP-11P
SP-111HP
SP-111OP
3,2,1
3,2,1
3,2
4551248262129
141
145
 SP-211HP
SP-211OP
3,2,1
2,1
909247165124155
175
SP-311P2,31620371247186220
SP-114P1,081018812594260
SP-214P
SP214OP
1,01620376251188328
340
IBF-240OP
IBF-214OP
1,01620395264197470
SP-314HP
SP-314HP
1,02430564376282408
IBF-314OP
IBF-314OP
IBF-314OP
1,0304074134943713595
SP-218OP
SP-218OP
0,004000622415311660
SP-318P06000933622467700
IBF-318OP

IBF-318OP

IBF-318OP

075001224381636123920
SP-321P
IBF-321OP
0,0
0,0
6730
8400
1270
16673
847
11113
 635
8343
1110
121

The first digit in the alphanumerical Twin Disc model number is the number of clutch plates. The next digit of the Twin Disc model number is the clutch size in inches. Putting this together, a Twin Disc Model C106SP is a single plate, 6″ clutch. The next column lists the available power takeoffs by SAE bell housing sizes. To continue our example, a Twin Disc Model C106HP5 has an SAE #5 housing. If you are rusty on SAE housing dimensions, take a look at our Tech Tip #41, SAE Bell Housings Made Easy!. The next column lists the maximum torque capacity that a particular clutch size will handle. The next two columns refer to SAE duty classifications for PTOs, and the last column gives the weight.

Manufacturers names, symbols and numbers are for reference purposes only and do not imply manufacturing origin.