ARP 1x Connecting Rod Fastener Bolt, 7/16″ x 1.600″, Custom Age 625+

This is a single ARP connecting rod fastener/rod bolt manufactured to Custom Age 625+ standard. It measures 7/16″ x 1.600″.

ARP uprated connecting rods are used in a variety of applications from rebuilt stock motors to modified powerplants used in track, marine and drag racing engines. These bolts provide a reliability and performance standard that exceeds OEM and most aftermarket products.

This item is sold as a single bolt only – each con-rod requires 2 bolts. Please specify total quantity required when ordering. This does not fit with OEM con-rods.

Overview

• Description: Connecting Rod Fastener Bolt
• Material Grade: Custom Age 625+
• Size: 7/16″ x 1.600″
• Quantity: x1 / SINGLE BOLT ONLY
• Part Number: AR8918
• Supplier: ARP

At A Glance

• Thread Size: 7/16″
• Under Head Length (UHL): 1.600″
• Thread Length: 0.600″
• Grip Length: 0.200″
• Head Height: 0.388″
• Socket Size: 7/16 / 12pt
• Collar Diameter: 0.644″
• Stretch: 0.0055″-0.0060″
• Torque: 90 ft lbs / 122 Nm

ARP Connecting Rod Bolt Material Overview

8740 CHROME MOLY: 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, only if the threads are rolled after heat-treatment, as is ARP’s standard procedure. Chrome moly can be heat-treated to deliver tensile strengths be tween 180,000 and 200,000 psi.

ARP2000: ARP2000 is an steel alloy that can be safely heat treated to a higher level than 8740. While 8740 and ARP2000 share similar characteristics – ARP2000 is capable of achieving a tensile strength of 220,000 psi. Stress corrosion and hydrogen embrittlement are typically not a problem.

L19: L19 is a very high strength material capable of delivering a tensile strength at 260,000 psi. L19 requires special care to avoid hydrogen embrittlement. This material is easily contaminated and subject to stress corrosion. It must be kept well-oiled and not exposed to moisture.

ARP3.5 (AMS5844): The high cobalt content of this alloy, while expensive, delivers a material with superior fatigue characteristics and typical tensile strength in the 260,000 280,000 psi range. The immunity to hydrogen embrittlement and corrosion is a significant design consideration. This material is primarily used in connecting rods where extremely high loads, high RPM and endurance are important factors.

CUSTOM AGE 625+: This super-alloy demonstrates superior fatigue 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+. Typical tensile strength is 260,000-280,000 psi.

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