In brief
ARP main bolt (1 pc.). Thread size M10x1.5 / 80mm UHL. VW / Audi 4-5 cyl. engines: 1.8T 20V - need 10 pcs. 1.8 2.0 16V - need 10 pcs. 1.9TDI 8V - need 10 pcs. 2.2T 20V - need 12 pcs. 2.5TDI 10V - need 12 pcs. Does not fit older style engines which use M10X1.5 / 65mm UHL bolts - Please check suitability before purchase.
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8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi
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