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 640-2500 Chromoly 12-Point Bolts 1/4-20 x 2.500 Black Oxide 5-Pack

Manufacturer

Picture for manufacturer ARP

Part Number

640-2500
15 reviews
Sale Price

$13.36

Estimated ship date Thursday, November 19

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 640-2500 is a premium 5-piece bolt kit featuring heat-treated 8740 chromoly fasteners with a durable black oxide finish. These universal bolts are designed for high-performance automotive, marine, and trailer applications where superior strength and reliability are essential.

Key Specifications:

  • Thread Size: 1/4 inch-20 RH (right-hand thread)
  • Length: 2.500 inches UHL (under head length)
  • Head Style: Flanged 12-point for positive engagement
  • Wrenching Size: 5/16 inch
  • Material: Heat-treated 8740 chromoly steel
  • Finish: Black oxide for corrosion resistance
  • Tensile Strength: 180,000 psi nominal rating

Features and Benefits:

  • Substantially stronger than Grade 8 hardware with extra margin of safety
  • 12-point head design allows for better tool engagement in tight spaces
  • Precision-manufactured to ARP's exacting tolerances
  • Black oxide coating provides rust and corrosion protection
  • Includes washers for complete installation
  • Perfect for custom fabrication, brackets, and general high-stress applications

Each kit contains 5 bolts with matching washers. ARP fasteners are trusted by professional engine builders and racers worldwide for their exceptional quality and consistent performance. Whether you're building a race car, hot rod, or heavy-duty trailer, these chromoly bolts deliver the strength and durability you need.

Products specifications

Fastener Finish

Black oxide

Fastener Head Style

12-Point

Fastener Material

Chromemoly

Fastener Yield Strength (psi)

170,000 psi

Material

Black Oxide

Quantity

Sold as a set of 5.

Size

1/4-20 x 2.5

Thread Size

1/4-20 in.

Underhead Length (in)

2.500 in.

Washers Included

Yes

Wrench Diameter

5/16 in.

Wrenching

5/16

Easy ordering

Everything went perfectly. The item received was as advertised and arrived when it should have.

Quick and easy. Cheapest price on the net with shipping!

All was good with order

Pretty good prices

Pleased

Great service

Good stock

Lowest price found. Everyone else 25 to 50 dollars more. Great price!!!!!!!

Found Autoplicity through price searching. Best price, easy to navigate site, quick service. Bookedmarked for future use!

An easy to navigate website, great prices and efficient company. I will definitely check Autoplicity first for all of my automotive needs. From purchase to arrival I was well informed as to the status of my order.

Fast and easy

I ordered CV axles from Autoplicity and had them in less than a week! Definitely the best prices for quality product on this item. Will be a return customer for sure!

I was apprehensiveness at first to make a major purchase with Autoplicity due to their extremely low price and lack of reviews. I decided to take the chance and I am very glad I did. I made my order on a Monday morning at 0900 eastern time and my product arrived on Wednesday at 3pm. The item was exactly as described and the most astonishing part is that my purchase was released from the factory less than 45 days ago. I was expecting a model that had been sitting on a shelf for the last year and needed to be updated. That was not the case. I will definitely order from Autoplicity again in the future.

great prices,fast shipping,cheaper than discount warehouse

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