33 characteristics and typically tensile strength in the 260,000-280,000 psi range. The immunity to hydrogen embrittlement and corrosion of these materials is a significant design consideration. These materials are primarily used in connecting rods where extremely high loads, high RPM and endurance are important factors – Formula 1, NASCAR and IRL applications. CUSTOM AGE 625 PLUS®: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace MP-35 as the material of choice in the high strength, super-alloy field. Typical tensile strength is 260,000-280,000 psi. TITANIUM: ARP now offers special order fasteners made of an alloy (Ti6Al-4V) that is specially heat-treated (a process developed by ARP’s own Russ Sherman) and provides superior strength to other titanium alloys employed in racing and aerospace. The material has a nominal tensile strength of 180,000 psi, and is very corrosion resistant. The main advantage of titanium, of course, is its weight – which is about 40% lighter than a comparable fastener made of steel. Head studs and accessory bolts are ideal applications for this lightweight material. QUICK REFERENCE GUIDE TO MATERIALS USED IN FASTENERS MATERIAL USE? YIELD STRENGTH TENSILE STRENGTH USED FOR Grade 5 No 90,000 psi 120,000 psi Accessory bolts & studs Grade 8 No 120,000 psi 150,000 psi Accessory bolts & studs “Stainless 300” Yes 140,000 psi 170-190,000 psi Accessory bolts & studs Custom 450® Yes 150,000 psi 170-190,000 psi Accessory bolts & studs, head bolts 8740 chrome moly Yes 170,000 psi 190,000 psi Rod bolts, head & main studs & bolts A286 Yes 170,000 psi 200,000 psi Head bolts, accessory bolts ARP2000® Yes 200,000 psi 220,000 psi Rod bolts, head & main studs L19® Yes 220,000 psi 260,000 psi Connecting rod bolts Inconel 718 Yes 190-210,000 psi 210-230,000 psi head bolts, case studs & bolts Custom Age 625+ Yes 235-255,000 psi 260-280,000 psi Head studs, connecting rod bolts ARP 3.5® Yes 220-250,000 psi 260-280,000 psi Connecting rod bolts AerMet® Yes 260,000 psi 290-310,000 psi Special products Titanium Yes 160,000 psi 180,000 psi Head studs, accessory bolts Material Specifications FASTENER TECH
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