ARP Harmonic Balancer Bolt Kit 12-Point Small Block/Big Block



  • 8740 Chromoly Construction
  • Black Oxide Finish
  • 200,000 PSI Tensile Strength
  • 12-Point Bolts
MSRP $73.20
You save 39%

ARP 12-Point Harmonic Balancer Bolt Kit for Small Block and Big Block Engines.

This ARP 12-Point Harmonic Balancer Bolt Kit from CJ Pony Parts will include a bolt, washer and ultra-torque fastener assembly lubricant which will be needed for a correct and secure installation. The harmonic balancer bolt (150-2503) provides maximum clamping force to the harmonic balancer to keep it securely in place. It is manufactured from 8740 chromoly steel with a black oxide finish and provides a tensile strength of 200,000 psi! This harmonic balancer bolt features a 1/4" thick wide-area washer and an extra tall 12 point head which allows for the use of a deep socket to prevent the head from stripping.

Harmonic Balancer Bolt Specifications:
- Thread Size: 5/8-18”
- Under Head Length: 2.050”
- Head Style: Square drive
- Washer Included: Yes
- Fastener Yield Strength: 200,000 psi
- Fastener Material: 8740 chromoly
- Fastener Finish: Black oxide
- Quantity: Sold Individually

Reducing torsional vibration is pivotal to preventing overwhelming resonance and eventually crankshaft failure. As the crankshaft flexes and twists, the harmonic balancer absorbs incredible amounts of kinetic energy. This high quality and sturdy ARP Harmonic Balancer Bolt Kit helps to maintain the integrity and firmness of the harmonic balancer, or crankshaft damper, in your small block or big block engine.

*Will not fit 351C.

- 1965-1995 Mustangs
- 1966-1977 Broncos
- 1973-1979 F-100s
- Engine Sizes: 221, 255, 260, 289, 302, 351W, 351M, 400M, 360, 390, 427, 428, 429 and 460

The engine in your Ford is held together by a myriad of nuts, bolts and screws, which allow it to work despite the incredible pressures and forces acting upon it. However, what happens if that hardware fails, or you need to upgrade it to handle additional performance? With the hardware from ARP, you're getting the best products on the market, and those trusted by Formula 1, IndyCar, NHRA and NASCAR. So, if you're needing new engine hardware, look no further than ARP!

Order this ARP 150-2503 12-Point Harmonic Balancer Bolt Kit for your Small Block or Big Block Engine from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Videos

Video Transcript

We’re here with an ARP 12 point harmonic balancer bolt kit fitting your small block and big block engine. High quality hardware from ARP is a great way to take your engine build to the next level. This 12 point bolt from ARPs can replace the factor harmonic balancer bolt which is a very important part of your engine assembly. This bolt features 200,000 PSI strength, making it much stronger than the factory bolt and it has been in a black oxide coated 8740 chrome molly.

This will fit all big block and small block board engines with the exception of the 351 Cleveland and is made right here in the U.S.A.

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following F-100 years:

This product will fit the following Mustang years:

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