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Idler Pulley Bore and Bushing Adapters

Bushing Bore Adapters
Part No. Bolt dia. Stand-off
BA35* 5/16"   7.9 mm 0
BA38 3/8"   9.5 mm 0
BA41 0.394"   10 mm 0
BA47 0.472"   12 mm 0
BA50 1/2"   12.7mm 0
idler bushing
Shoulder Adapters
Part No. Bolt dia. Stand-off
SA2530 1/4"   6.4 mm 0.30"   7.6 mm
SA3139 5/16"   7.9 mm 0.39"   9.9 mm
SA3179 5/16"   7.9 mm 0.79"   20.1 mm
SA3827 3/8"   9.5 mm 0.27"   6.9 mm
SA3831 3/8"   9.5 mm 0.31"   7.9 mm
SA3841 3/8"   9.5 mm 0.41"   10.4 mm
SA3846 3/8"   9.5 mm 0.46"   11.7 mm
SA3851 3/8"   9.5 mm 0.51"   13 mm
SA3859 3/8"   9.5 mm 0.59"   15 mm
SA3876 3/8"   9.5 mm 0.76"   19.3 mm
SA4130 0.394"   10 mm 0.30"   7.6 mm
SA4951 0.492"   12.5 mm 0.51"   13 mm
SA5027 1/2"   12.7 mm 0.27"   6.9 mm
SA5051 1/2"   12.7 mm 0.51"   13 mm
SA5076 1/2"   12.7 mm 0.76"   19.3 mm
idler bushing
Clevis Adapters
Part No. Bolt dia. Stand-off
CA3827 3/8"   9.5 mm 0.27"   6.9 mm
CA3851 3/8"   9.5 mm 0.51"   13 mm
CA5027 1/2"   12.7 mm 0.27"   6.9 mm
CA5051 1/2"   12.7 mm 0.51"   13 mm
idler bushing

Stand-off from outer edge of idler = Stand-off - (Width of idler - 0.472")/2

Example: Stand-off from outer edge of Idler 3/8" x 3"
with shoulder adapter SA3827 = 0.27" - (0.65" - 0.472")/2 = 0.18"

Stand-off from center of idler = Stand-off + 0.236"

Example: Stand-off from center of Idler 3/8" x 3"
with shoulder adapter SA3827 = 0.27" + .236" = 0.506"

6203 bearing dimensions:
40 mm (1.575") OD, 12 mm (0.472") thick, 17 mm (0.669") bore.

*For use only with Idler 5/16" x 2.13", which has a 6202 bearing with a 15 mm bore.

For the best in bore and bushing adapters, insist on DuraBelt.
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