A-IS401858-AI Idler Sprocket

One New Aftermarket Replacement #40 Roller Chain Idler Sprocket – 18 Tooth, 5/8″ Bore

This aftermarket replacement idler sprocket is designed for use with #40 ANSI roller chain. Idler sprockets remove slack and maintain proper tension in chain drive systems commonly found on agricultural equipment such as balers, combines, planters, hay equipment, and other farm machinery. The sprocket features hardened teeth and a precision ball bearing insert for smooth, reliable operation in demanding field conditions.

Specifications

• Chain Size: #40 ANSI Roller Chain
• Number of Teeth: 18
• Bore: 5/8″ (Bearing Bore)
• Bearing: Precision ball bearing insert, pre-installed

Compatible Applications

This is a universal-fit idler sprocket suitable for various makes and models of agricultural equipment, hay equipment, planters, combines, balers, and other machinery using #40 roller chain drive systems. Verify chain size, tooth count, and bore diameter match your application before ordering.

Replaces Part Number(s):

IS4018-58, IS401858, A-IS401858-AI

New aftermarket replacement part – not remanufactured, not used.