Fasteners hold the engine together and matter far more than their cost suggests, with critical joints depending on a specified grade, torque figure and tightening sequence. This group covers bolts, screws, studs and nuts, washers, clamps and clips, dowels and pins, plugs and threaded adaptors. CAT specifies torque-to-yield fasteners for critical joints including cylinder heads, connecting rods and main bearing caps; these are stretched past their elastic limit on assembly and are single-use items that must be replaced whenever the joint is opened. CAT publishes both a torque figure and a tightening sequence for these joints, and following the sequence matters as much as the figure.
AMS Parts supplies a wide range of fasteners & hardware components for CAT engines used in power generation, marine, and industrial applications. Browse the full range below, or contact us for specific requirements.
Browse our range of Fasteners & Hardware parts below. Use the search bar above to find a specific part number, or request a quote.
Torque-to-yield head bolts are single-use and must be replaced whenever the head is removed. Reusing a stretched bolt risks under-clamping the joint and gasket failure.
No. Engine fasteners are specified to a grade and often a defined stretch behaviour. A visually similar bolt of a lower grade may hold on assembly and fail later under load.
Sequence distributes clamp load evenly and prevents distortion of the component. Tightening out of order is a common cause of repeat gasket failure.
