Drive Belts & Kits
Drive Belt Automatic Tensioners
Drive Belt Idler & Tensioner Pulleys
Overrunning Alternator Pulleys
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Timing Belt - Hydraulic Automatic Tensioners (HAT)
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Overrunning Alternator Pulleys

With the ever increasing number of accessories and auxiliary systems that require extra electrical power in modern cars, Overrunning Alternator Pulleys (OAPS) are becoming increasingly popular on many late model vehicles to deal with increased alternator loads and engine torsional fluctuations.

Dayco Australia offers the aftermarket the premium quality Nuline range of Overrunning Alternator Pulleys (OAPS). Dayco’s broad range consists of 114 part numbers covering 32 current vehicle manufacturers from Alfa Romeo to Volvo.

Auxilliary systems such as power seats, heated and cooled seats, GPS navigation systems, electric power steering systems, on board entertainment systems and more all place increased strain on alternators, front end accessory drives and drive belts, unless managed effectively by quality Overrunning Alternator Pulleys (OAPS).

Dayco OAPs allow the alternator to ‘freewheel’ when the belt speed drops and are engineered with one-way clutches that allows the rotational inertia of the alternator to “overrun” during any belt deceleration. Dayco OAPs, which are designed for long service life, decrease drive belt vibration and reduce belt slippage during rapid acceleration or deceleration, resulting in reduced stress on the drive belt and other accessories as well as increased alternator and drive belt life.

Note: Overrunning alternator pulleys require special tools for removal and fitment, Nuline have the necessary tools available.


Click on a column heading to sort the items in the list

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Part numberWidthInside DiameterOutside DiameterToolThreadOAP Connection Type
OAP00135.9mm17mm59.7mmOAPT33M1633 Tooth Spline
OAP00240.2mm17mm52.1mmOAPT33M1633 Tooth Spline
OAP00338.3mm17mm49.1mmOAPT33M1733 Tooth Spline
OAP00436.5mm17mm55.6mmOAPT33M1633 Tooth Spline
OAP00540.6mm17mm57mmOAPT33M1633 Tooth Spline
OAP00634.5mm17mm64.5mmOAPT17M1717mm Hex
OAP00740.4mm17mm50mmOAPT33M1633 Tooth Spline
OAP00841.5mm15mm58.1mmOAPT17M1417mm Hex
OAP00940.5mm17mm55mmOAPT17M1417mm Hex
OAP01050.2mm17mm55mmOAPT17M1417mm Hex
OAP01145.4mm17mm56mmOAPT33M1733 Tooth Spline
OAP01240mm17mm50mmOAPT33M1733 Tooth Spline
OAP01341.3mm17mm52.5mmOAPT17M1417mm Hex
OAP01440.5mm17mm58.4mmOAPT33M1633 Tooth Spline
OAP01539.3mm17mm64.8mmOAPT33M1733 Tooth Spline
OAP01634.7mm17mm53.6mmOAPT33M1633 Tooth Spline
OAP01738mm17mm55mmOAPT33M1633 Tooth Spline
OAP01842.4mm17mm55.8mmOAPT33M1633 Tooth Spline
OAP01947mm17mm57.6mmOAPT17M1717mm Hex
OAP02038mm17mm60mmOAPT33M1633 Tooth Spline
OAP02137.2mm17mm54.4mmOAPT33M1633 Tooth Spline
OAP02241.15mm17mm55.8mmOAPT33M1633 Tooth Spline
OAP02340.2mm17mm49.5mmOAPT33M1633 Tooth Spline
OAP02439.3mm17mm59.7mmOAPT33M1733 Tooth Spline
OAP02548.2mm17mm52mmOAPT33M1733 Tooth Spline
OAP02645.4mm17mm56mmOAPT33M1733 Tooth Spline
OAP02745.6mm17mm57.5mmOAPT17M1417mm Hex
OAP02834.8mm17mm49.9mmOAPT33M1633 Tooth Spline
OAP02934.6mm17mm59.7mmOAPT33M1633 Tooth Spline
OAP03042.8mm17mm56.8mmOAPT33M1633 Tooth Spline
OAP03138.25mm17mm49mmOAPT33M1633 Tooth Spline
OAP03238mm17mm56mmOAPT33LH M1633 Tooth Spline
OAP03336.85mm17mm54.3mmOAPT33M1633 Tooth Spline
OAP03438.3mm17mm54.3mmOAPT33M1633 Tooth Spline
OAP03534.7mm17mm53.6mmOAPT33M1633 Tooth Spline
OAP03642mm17mm67.8mmOAPT33M1633 Tooth Spline
OAP03740.9mm17mm54mmOAPT33M1633 Tooth Spline
OAP03833.2mm17mm54.3mmOAPT33M1633 Tooth Spline
OAP03944.8mm17mm55.7mmOAPT33M1633 Tooth Spline
OAP04035.8mm17mm50mmOAPT33M1633 Tooth Spline
OAP04139.3mm17mm49.7mmOAPT33M1633 Tooth Spline
OAP04238.5mm17mm48.7mmOAPT33M1633 Tooth Spline
OAP04334.2mm17mm61.7mmOAPT33M1633 Tooth Spline
OAP04441mm17mm68.8mmOAPT33M1633 Tooth Spline
OAP04539mm17mm59.5mmOAPT33M1733 Tooth Spline
OAP04638.1mm17mm48.8mmOAPT33M1633 Tooth Spline
OAP04739.7mm17mm60mmOAPT33M1633 Tooth Spline
OAP04833.9mm17mm49.2mmOAPT33M1633 Tooth Spline
OAP04933.7mm17mm49mmOAPT33M1633 Tooth Spline
OAP05038.2mm17mm55.67mmOAPT33M1633 Tooth Spline
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