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Flat Idler Pulley and Flat Drive Pulley (Sheave) Sizes

flat idler pulleyflat idler sheave and pulley

Convert units to:    
Part Number OD ID GW W Crown
Flat Idler/Drive 1.75" x .75" 2.22" 1.75" 0.75" 0.93" 0.016"
Flat Idler/Drive 1.88" x .50" 2.12" 1.88" 0.51" 0.70" 0.012"
Flat Idler/Drive 1.88" x .75" 2.00" 1.88" 0.75" 0.97" 0.016"
Flat Idler/Drive 1.88" x 1.38" 2.09" 1.88" 1.38" 1.56" 0.016"
Flat Idler/Drive 2" x 1" 2.35" 2.00" 1.00" 1.15" 0.020"
Flat Idler/Drive 2.25" x .75" 2.72" 2.25" 0.75" 0.93" 0.016"
Flat Idler/Drive 2.5" x .75" 2.97" 2.50" 0.75" 0.93" 0.016"
Flat Idler/Drive 2.5" x 1" 2.97" 2.50" 1.00" 1.18" 0.020"
Flat Idler/Drive 2.75" x .75" 3.22" 2.75" 0.75" 0.93" 0.016"
Flat Idler/Drive 2.75" x .86" 3.19" 2.75" 0.86" 1.05" 0.018"
Flat Idler/Drive 2.75" x 1" 3.22" 2.75" 1.00" 1.18" 0.020"
Flat Idler/Drive 3" x .75" 3.50" 3.00" 0.75" 1.01" 0.016"
Flat Idler/Drive 3" x 1.01" 3.47" 3.00" 1.01" 1.18" 0.020"
Flat Idler/Drive 3.13" x .75" 4.00" 3.12" 0.75" 1.11" 0.016"
Flat Idler/Drive 3.5" x .75" 4.12" 3.50" 0.75" 0.98" 0.016"
Flat Idler/Drive 3.5" x .97" 3.97" 3.50" 0.97" 1.15" 0.020"
Flat Idler/Drive 4" x .72" 4.60" 4.00" 0.72" 1.06" 0.016"
Flat Idler/Drive 4" x .86" 4.75" 4.00" 0.86" 1.34" 0.018"
Flat Idler/Drive 4" x 1" 4.62" 4.00" 1.00" 1.18" 0.020"
Flat Idler/Drive 4.5" x .96" 4.96" 4.50" 0.96" 1.13" 0.020"
Flat Idler/Drive 5" x 1.25" 5.88" 5.00" 1.25" 1.56" 0.030"
Flat Idler/Drive 5.5" x 1 6.00" 5.50" 1.00" 1.26" 0.020"
Flat Idler/Drive 6" x .75" 6.50" 6.00" 0.75" 0.99" 0.016"
Flat Idler/Drive 6" x 1" 6.50" 6.00" 1.00" 1.28" 0.020"
Flangeless Idler/Drive 2" x 1" n/a 2.00" n/a 1.00" 0.025"
Flangeless Idler/Drive 2" x 1.25" n/a 2.00" n/a 1.25" 0.030"
Flangeless Idler/Drive 2.5" x 1" n/a 2.50" n/a 1.00" 0.025"
Flangeless Idler/Drive 2.5" x 1.25" n/a 2.50" n/a 1.25" 0.030"
Flangeless Idler/Drive 3" x 1" n/a 3.00" n/a 1.00" 0.025"
Flangeless Idler/Drive 3" x 1.25" n/a 3.00" n/a 1.25" 0.030"

Idler Pulley Bore Adapters

Idler Pulley Bore Adapters

Drive Pulley Bore Adapters

Drive Pulley Bore Adapters


These flat idler pulleys and flat drive sheaves are designed for DuraBelt's flat urethane belts, but they also work well with any kind of flat belt. Uses 6203 bearings -- 12 mm wide, 17 mm bore.

Our flat idler pulleys and flat drive sheaves are made from nylon reinforced with fiberglass and ABEC-1 ball bearings. This nylon material is easy to machine on a lathe, and there is no fiberglass dust, as long as you do not grind it. We can cut down the flanges and/or add grooves (e.g. Poly-Vee grooves) at a slight extra cost.

When ordering by part number, specify either Flat Idler or Flat Drive, but not both.

Our idler pulleys can be converted to drive pulleys with our drive adapters. Click here for Flat Pulley specs.

Maximum bore diameter:  idler pulleys = 17mm (0.669"), drive pulleys = 25.4mm (1")

For the best in flat idler sheaves and flat drive pulleys, insist on DuraBelt.
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