Drivetrain› Belt and Chain Drive

Circle D Specialties

6-Bolt Crankshaft Bolt Kit for GM LS

$40.00

SKU: BOLTS-GM-ARP-FLEX-6

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
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Easy — 1–2 hours

Overview

These bolts are forged from aerospace alloy, heat-treated, and feature a flat 12-point head design with a larger-than-stock shank diameter.

This kit specifically includes 6 bolts for use with GM LS 6-bolt crankshafts. An 8-bolt LT option is also available. The bolts have an M10 x 1.50 thread size and require a 13mm hex socket.
Show original supplier description
The Circle D Specialties GM LS ARP Flexplate Bolt Kit provides a superior alternative to standard OEM hardware for securing your flexplate. These bolts are engineered with premium-grade ARP Pro Series construction, utilizing aerospace alloy that is forged and heat-treated before being precision machined and thread-rolled. This ensures exceptional strength and durability for high-performance applications. A key feature of these bolts is their exclusive flat 12-point head design, which, combined with a larger-than-stock shank diameter, enhances overall strength and improves the registration between the flexplate and crankshaft. This offers increased reliability and a more secure connection. This specific kit is designed for GM LS engines featuring a 6-bolt crankshaft, providing a direct-fit replacement. Circle D Specialties also offers an 8-bolt LT option for compatible applications. The bolts feature an M10 x 1.50 thread size and are secured with a 13mm hex head, making installation straightforward with common tools.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCircle D Specialties
Part NumberBOLTS-GM-ARP-FLEX-6
CategoryDrivetrain

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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