My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

ARP 300-6721 Custom Age 625+ Connecting Rod Bolts 2-Piece Kit

Manufacturer

Picture for manufacturer ARP

Part Number

300-6721
5 reviews
Sale Price

$114.01

Estimated ship date Tuesday, February 02

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The ARP 300-6721 connecting rod bolt kit is designed as a direct replacement for Carrillo, Lentz, and Ferrea connecting rods. This 2-piece kit features ARP's premium Custom Age 625+ super-alloy material, delivering exceptional strength and fatigue resistance for high-performance racing applications.

Custom Age 625+ Material Benefits:

  • Superior fatigue cycle life and tensile strength of 260,000-280,000 psi
  • Complete resistance to atmospheric corrosion and oxidation
  • Excellent toughness for extreme load conditions
  • Cost-effective alternative to MP-35 super-alloys

ARP Manufacturing Excellence:

  • Forged in-house using premium quality materials
  • Heat-treated with vertical racks for complete 360-degree penetration
  • Threads rolled after heat-treat for up to 10 times longer fatigue life
  • Precision CNC-machined to exacting specifications
  • ARP name stamped on each bolt for quality assurance

Important Installation Notes: Monitor bolt stretch regularly and replace when permanent elongation reaches 0.0005 inches. Washers are not included with this kit. Always follow proper torque specifications and lubrication procedures for optimal performance and reliability.

ARP rod bolts are the preferred choice of leading connecting rod manufacturers and professional race teams worldwide. The Custom Age 625+ material represents the latest advancement in super-alloy fastener technology, providing the strength and durability demanded by top-tier racing applications.

Products specifications

Socket

1/2

Thread

7/16

UHL

1.75in

super easy checkout with amazon link! Let's you know if in stock or not, which is critical when ordering racing components.

I just finished a transaction with this company and decided to write my very first post, based upon my experience with them. To be honest, a few short hours ago I was wary of how this would turn out. There had been a miscommunication with shipping and it started to go down hill. Lo and behold, something happened that is rare today. The company, from top to bottom put all of their efforts together, communicated with me even during a Holiday and rectified the situation. Not only would I recommend Autoplicity to others but implore potential customers to use them confidently. Their work ethics and customer service is top notch and I am very grateful for my renewed trust that there is more than just big box, fast food companies out there. Thank you again!!

Awesome website for car parts. I found mine at the best possible price even after shipping costs. Could anyone ask for more? I dont think so...

Love them!!! They send E-Mail conformation when order is placed and tracking number when shiped.

amazing company fast and easy shipping. part came in as advertised, cheap too

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy