ARP Flexplate Bolt Kit 7/16-20 x 0.680 in — Pro Series Chromoly, 12-Point Head, Black Oxide (Set of 6)

ARP 200-2902 is a six-bolt flexplate fastener kit engineered from chromoly with a 12-point head and black oxide finish for durable, high-clamp mounting of flexplates to crank flanges.

When you need reliable, high-strength hardware to secure a flexplate to the crankshaft, ARP’s Pro Series bolts are a common OEM-quality upgrade for performance and rebuild applications. This kit contains six 7/16-20 threaded bolts, each 0.680 inches long, made in the USA from chromoly material and finished in black oxide to resist corrosion while delivering consistent clamp load and fatigue life.

How do these bolts improve flexplate attachment reliability?

These bolts are manufactured to tighter tolerances and higher tensile strength than typical factory fasteners, reducing the risk of stretch and loosening under torque and vibration. The 12-point head allows for secure torque application in confined spaces and helps maintain correct preload.

• Chromoly construction for increased tensile strength and fatigue resistance
• Black oxide finish for basic corrosion protection and controlled friction
• 12-point head design for better socket engagement in tight engine bays
• Set of six bolts matched to common flexplate configurations

What are the exact size and fitment details I should check?

Each bolt in this ARP kit features a 7/16-20 UNF thread with a length of 0.680 inches, so verify your flexplate and crank flange thread depth and diameter before installing. These dimensions are typical for many domestic V8 flexplate applications but always cross-reference part numbers and service manuals for compatibility.

• Thread size: 7/16-20 UNF
• Thread engagement length: 0.680 inches
• Head type: 12-point for compact wrenching
• Quantity: Set of six bolts (ARP PN 200-2902)

How should I install and torque these ARP bolts safely?

Use a calibrated torque wrench and follow ARP’s recommended torque and lubricants for chromoly fasteners to achieve correct clamp load. Clean threads, apply the specified lubricant to the bolt shank/threads if required, and tighten in a star or crisscross pattern to prevent pull distortion of the flexplate.

• Clean and inspect threads before assembly
• Use ARP-recommended torque values and lubricant for chromoly bolts
• Tighten bolts in an even sequence to specified torque
• Replace bolts if any show signs of thread damage or stretching

Who is this kit intended for? ARP’s 200-2902 Pro Series flexplate bolt set is aimed at mechanics, engine builders, restorers, and performance enthusiasts who require a higher-strength replacement for stock flexplate hardware. It’s suitable for rebuilds, engine swaps, and high-use or high-vibration applications where reliable clamp and engineered fastener performance matter. Because these bolts are made in the USA and produced from chromoly with a black oxide finish, they offer a balance of durability and corrosion resistance for long-term service. Before purchase, confirm thread size and length match your crank and flexplate specifications; if uncertain, consult the vehicle service manual or ARP’s technical resources to prevent misfit or improper torque application.