ARP 247-5402 89-97 Cummins 5.9L 12V Main Stud Kit
ARP 247-5402 89-97 Cummins 5.9L 12V Main Stud Kit
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ARP 89-6/97 Dodge Cummins 5.9L Diesel 12V 2 Bolt Main Stud Kit

ARP
ARP247-5402
672036034603
Main Stud & Bolt Kits
1 Units In Stock - Ships Next Business Day
$ 309.00
$ 309.00

Chromoly Main Studs Built For High-Boost 5.9L Cummins Builds

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.

Key Features

  • 247-5402 uses 14mm chromoly main studs for the 5.9L 12V Cummins block
  • Manufactured from 8740 chrome moly steel, heat-treated to 190,000-200,000 psi tensile strength
  • Centerless-ground and thread-rolled to MIL-S-8879 specification
  • Black oxide finish for corrosion resistance
  • Includes hardened parallel-ground washers and high-strength hex nuts
  • Main studs only, not intended for cylinder head bolt applications

Fitment

Year Range Make Model Trim
1989-1997 Dodge Ram Cummins 5.9L 12V

Specifications

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)

What's Included

  • Set of 14mm chromoly main studs (247-5402)
  • Hardened parallel-ground washers
  • High-strength hex nuts

About ARP

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.

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FAQ

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.

Install Instructions

  1. Remove the engine and disassemble down to the bare block, following the factory service procedure for the 5.9L 12V Cummins.
  2. Clean and inspect the main cap and block threads, and have the block align-honed if required for stud installation.
  3. Install the 247-5402 studs into the block per ARP's included torque specifications.
  4. Set the main caps in place and install the hardened parallel-ground washers and hex nuts.
  5. Torque the 247-5402 nuts in the proper sequence and stages per ARP's instructions.
  6. Complete engine reassembly and verify crankshaft rotation is free before returning the engine to service.

Prop 65 Warning

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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