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The ARP 247-5402 replaces the factory main cap bolts on the 5.9L 12V Cummins with 14mm chromoly main studs, giving the block additional clamping strength to resist cap walk under high-boost and high-horsepower conditions. Each stud in the 247-5402 kit is machined from 8740 chrome moly steel and heat-treated to a tensile strength of 190,000 to 200,000 psi, then centerless-ground and thread-rolled to MIL-S-8879 specification for consistent, repeatable clamp load. The black oxide finish on the 247-5402 studs resists corrosion during the life of the engine build. This is a main stud kit only and is not designed for cylinder head applications.
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1989-1997 | Dodge | Ram | Cummins 5.9L 12V |
| Detail | Value |
|---|---|
| MPN | 247-5402 |
| UPC | 672036034603 |
| Stud Diameter | 14mm |
| Material | 8740 chrome moly steel |
| Tensile Strength | 190,000-200,000 psi |
| Thread Spec | MIL-S-8879, centerless-ground and thread-rolled |
| Finish | Black oxide |
| Application | Main studs (not cylinder head) |
ARP manufactures premium fasteners for engine building, including the 247-5402 main stud kit, using chrome moly steel and precision thread-rolling to deliver consistent clamp load under repeated high-stress cycles. ARP's manufacturing process is built around tighter tolerances and higher tensile strength than factory OE hardware.
What is the ARP 247-5402?
The ARP 247-5402 is a 14mm chromoly main stud kit for the 1989-1997 Dodge Ram 5.9L 12V Cummins, replacing the factory main cap bolts to resist cap walk under high-boost conditions.
Does the 247-5402 fit cylinder head applications?
No, the 247-5402 is a main stud kit only and is not designed or rated for cylinder head bolt applications.
What is the tensile strength of the 247-5402 studs?
The 247-5402 studs are heat-treated to a tensile strength of 190,000 to 200,000 psi.
What hardware is included with the 247-5402?
The 247-5402 kit includes the main studs, hardened parallel-ground washers, and high-strength hex nuts.
What finish does the 247-5402 use?
The 247-5402 studs use a black oxide finish for corrosion resistance.
Why upgrade to main studs instead of factory main bolts?
Main studs like the 247-5402 provide more even and higher clamp load than factory bolts because studs thread into the block and are torqued with a nut, reducing the risk of cap walk in high-horsepower or high-boost applications.
What years of Cummins does the 247-5402 fit?
The 247-5402 is designed for the 1989 through 1997 5.9L 12V Cummins engine used in Dodge Ram trucks of that era.
Does the 247-5402 require machine work to install?
Main stud kits like the 247-5402 typically require the block to be align-honed or checked for proper stud hole preparation consult ARP's installation instructions and an experienced engine builder before installation.
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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