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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
5/16” - 18 x 1.000” Stainless Steel 12 - Point Bolt x 5 CP121

Stainless Steel 12-Point Bolt Pack

5/16-18 × 1.000 in

PART # CP121

Sold out
$60.73 - $60.73
$60.73
$60.73 - $60.73
$60.73
Availability:
Out of stock
Limited Lifetime Warranty
Free shipping is available on orders over $100 shipping to the USA or Canada.
Premium Stainless Steel Construction

Built from high-strength stainless steel for excellent corrosion resistance and long-term durability in harsh environments.

Precision 12-Point Head Design

Provides superior tool engagement and easier access in confined spaces, while enhancing the overall look of your engine bay.

Exact Fitment & Smooth Installation

5/16”-18 thread with 1.000” under-head length ensures proper engagement and consistent clamping across a wide range of applications. 

Versatile Automotive Use

Ideal for brackets, covers, and general engine bay hardware—universal fitment makes it a must-have for any build.

Your application

Match the hardware to your setup.

Check the thread, length and mounting arrangement against your components before ordering.

Size5/16-18 × 1.000 in

For applications requiring 5/16-18 threaded bolts with a listed length of 1.000 in. The 1.000 in length is measured under the head. Match the mating thread, required engagement, mounting thickness and head clearance before installation.

5/16”-18 x 1.000” Stainless Steel 12-Point Bolt x 5

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
5 5/16-18 × 1.000 in stainless steel 12-point bolts
1.000 in under-head length.
5 Washers
Five separate washers supplied with the bolts.

Engineering details

Match the thread. Check the length.

A bolt pack for applications selected by size. The thread specification, bolt length, head clearance and required engagement determine whether it suits your assembly.

The stainless bolt and washer The stainless bolt and washer. 12-point head, Washer, Threaded shank, Head flange. Representative geometry, not a fitment or bolt-pattern drawing. 12-point headWasherThreaded shankHead flange
Simplified component illustration. Shape and proportions are representative; see your kit specifications.

5/16-18 thread.

A 5/16-inch nominal diameter and 18 threads per inch. Match the mating thread before installation.

12-point drive.

Use a correctly fitting 12-point socket and confirm clearance around the bolt head.

1.000-inch under-head length.

1.000-inch under-head length. Check component thickness, washer thickness and required thread engagement for your assembly.

Before you order

Is this a vehicle-specific kit?

No. Select these bolts by thread, length and application requirements; a vehicle model alone does not establish compatibility.

Are washers included?

Yes. Five separate washers are supplied with the five bolts.

Can these replace any engine fastener of the same size?

No. Match the required material, strength, head style, length and installation specification as well as the thread size.

Which length is this pack?

This is the 1.000-inch under-head length pack. CP121 is the 1.000-inch option and CP122 is the 0.560-inch option.

Where can I find the installation procedure?

Contact XOTIC with your part number and application details for the correct installation procedure.

What warranty is included?

This product carries XOTIC PERFORMANCE’s limited lifetime warranty, subject to the warranty policy.

California Proposition 65 warning

WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov

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