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Idler Pulley Bore and Bushing Adapters

(Made from sintered powder metal, lightly oil impregnated to resist rusting)

Bushing Bore Adapters
Part No. Bolt dia. Stand-off
BA35* 5/16"   (7.9 mm) 0
BA38 3/8"   ( 9.5 mm) 0
BA41 0.413"   (10.5 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)
SA3820 3/8"   (9.5 mm) 0.20"   (5.1 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 0.413"   (10.5 mm) 0.30"   (7.6 mm)
SA4151 0.413"   (10.5mm) 0.51"   (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)
CA3876 3/8"   (9.5 mm) 0.76"   (19.3 mm)
CA5027 1/2"   (12.7 mm) 0.27"   (6.9 mm)
CA5051 1/2"   (12.7 mm) 0.51"   (13 mm)
idler bushing

To convert idler pulleys to drive pulleys see Drive Pulley Adapters.

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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