Head Bolts

Cylinder head bolts are the connecting elements between the cylinder head and the cylinder block of the engine. They hold the cylinder head with high loads to the engine block and the head gasket, and help the gasket to seal properly. When being torqued up, the bolts force is being distributed across the sealing surface and generates surface pressure to create mutual sealing of combustion chamber, lubricant & coolant channels, and the ambient air.

Head bolts are generally categorised into conventional and torque to yield head bolts. Conventional head bolts, commonly known as either unstretched bolts or roll-shaft bolts, feature straight-on-line threads. Torque to yield head bolts, namely stretched bolts or reduced-shaft bolts, are with threads that are not straight-on-line. Both types of bolts are tensioned until they deform, but torque to yield bolts can be tightened beyond their elastic limit into the plastic phase, delivering high and uniform clamping forces.


  • One of the most comprehensive ranges in Australian market
  • Designed and engineered for Australian vehicle applications
  • Includes all necessary components
  • Materials meeting or exceeding OE quality and specifications for durability and reliability



  • 3 Years or 60,000km whichever comes first


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