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Drive Pulley Bore Adapters

for Reinforced Nylon Round, Flat, and V Pulleys

Drive adapters are molded into our reinforced nylon round, flat and vee idler pulley line instead of bearings to convert them into drive pulleys. Hubs are made from sintered powder steel, lightly oil impregnated to resist rusting. All come with keyway and set screw.

Made from sintered powder metal, lightly oil impregnated, zinc coated or blackened to resist rusting. For washdown applications we can make stainless adapters.

Drive Pulleys with Bore Adapters

Part No.	Shaft dia.	OD	Stand-off	Keyway
DA25*	0.25" (6.3 mm)	1"	0.375" (9.5mm)	0.125" x 0.188" *
DA31*	0.31" (8 mm)	1"	0.375" (9.5mm)	0.125" x 0.156" *
DA38	0.375" (9.5 mm)	1"	0.375" (9.5mm)	0.125" (3.2mm)
DA50	0.50" (12.7 mm)	1"	0.375" (9.5mm)	0.125" (3.2mm)
DA63	0.625" (15.9 mm)	1.45"	>0.5" (12.7mm) See NOTE below	0.188" (4.8mm)
DA75	0.75" (19 mm)	1.45"	>0.5" (12.7mm) See NOTE below	0.188" (4.8mm)
DA100	1.00" (25.4mm)	1.45"	>0.5" (12.7mm) See NOTE below	0.25" x 0.188" **

Drive adapter (includes Set Screw)

*DA25 and DA31 drive adapters use bronze bushings to reduce our DA38 (3/8") bores down to 1/4" and 5/16" respectively. Consequently, the keyway is higher than the normal 1/8", so you may need a longer set screw.

**DA100 requires a rectangular key, key size is 3/16" x 1/4". Alternately, 1/4" square keys will work if you machine 0.063" off one side of the key.

NOTE: The stand-off for DA63, DA75 and DA100 adapters cannot be determined exactly until the pulley is made with the drive adapter installed. Since each pulley's hub that holds our universal drive adapter varies in thickness, the standoff for DA63, DA75 and DA100 adapters will usually be slightly longer than the formulas below.

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

Example: Stand-off from outer edge of Drive Pulley 3/8" x 3"
with DA50 = .375" - (0.65" - 0.472")/2 = 0.29"

Stand-off from center of drive pulley = Stand-off + 0.236"

Example: Stand-off from center of Drive Pulley 3/8" x 3"
with DA50 = 0.375" + .236" = 0.61"

For the best in drive pulley adapters, insist on DuraBelt.

082720

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