ARP Flexplate Bolt Kit for Dodge 5.9L Cummins — 12mm x 1.25, 0.700" Chromoly with 12-Point Heads

ARP 147-2901 is a vehicle-specific flexplate bolt kit made from chromoly with a black oxide finish, sized 12mm x 1.25 and 0.700" long with 12-point heads for Dodge 5.9L Cummins diesel engines.

This kit supplies the high-strength fasteners needed to secure the flexplate to the engine crank on Dodge 5.9L Cummins diesel applications. ARP engineered these bolts to resist stretch and fatigue under heavy loads, offering a durable replacement or upgrade over OE hardware. The part is tailored to specific vehicle fitments, making installation straightforward when matching your model year and crank configuration.

How do these bolts improve reliability compared with stock hardware?

ARP bolts are forged from chromoly steel and heat-treated for consistent tensile strength, reducing risk of bolt elongation or breakage under torque. The 12-point head design also helps achieve accurate torque with compatible tools, lowering the chance of improper tightening.

• Chromoly construction for superior strength and fatigue resistance
• Precision heat treatment for consistent clamping force
• 12-point head allows secure wrench engagement and cleaner torque application
• Black oxide finish offers mild corrosion protection and smoother seating

What are the exact dimensions and specifications I should expect?

Each bolt in the ARP 147-2901 kit measures 12 mm in diameter with a 1.25 mm thread pitch and a 0.700 inch shank length. The 12-point head geometry is compatible with standard 12-point sockets and distributes wrench loads across more faces than a hex head.

• Thread size: 12 mm x 1.25
• Shank length: 0.700 inch
• Head type: 12-point for precise torque delivery
• Finish: black oxide for reduced galling and improved corrosion resistance

Will this kit fit my Dodge 5.9L Cummins and what’s included?

The ARP 147-2901 is labeled as vehicle-specific for Dodge Cummins 5.9L applications; confirm compatibility with your engine year and flexplate by cross-referencing your OE part numbers or consulting fitment notes. The package is compact and designed for direct replacement of the original flexplate bolts.

• ARP part number 147-2901 for Dodge Cummins diesel
• Vehicle-specific fit — verify against your model year
• Packaged weight approximately 0.55 pounds
• Designed as direct OE-style replacement or upgrade

How should I install and torque these bolts for best results?

Install bolts into a clean, properly aligned flexplate and crank flange, following ARP or vehicle manufacturer torque sequence. Use a calibrated torque wrench and follow incremental torque steps to reach the recommended specification for your application to ensure even clamp load and long service life.

• Clean mating surfaces and threads before assembly
• Apply recommended lubricant or thread treatment per ARP instructions
• Tighten in the specified sequence using a calibrated torque wrench
• Retorque if required after initial engine run-in, per guidance

Who is this for? The ARP 147-2901 Flexplate Bolt Kit is ideal for owners and technicians working on Dodge 5.9L Cummins diesel trucks who want a stronger, more durable fastener than typical OE bolts. It suits professional shops, enthusiasts upgrading driveline durability, and anyone replacing worn or damaged flexplate bolts and seeking a vehicle-specific, high-quality chromoly solution.