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ARP 400-1201 Header Bolt Kit 12-Point Stainless Steel 12-Piece

Manufacturer

ARP

<h3>The Gold Standard in Performance Fasteners</h3> <p>When racing enthusiast Gary Holzapfel recognized that fastener failure was causing many engine breakdowns in 1968, he founded Automotive Racing Products (ARP) to solve a critical problem in motorsports. Drawing on his aerospace fastener manufacturing experience, Holzapfel created a company that would revolutionize the performance fastener industry. Today, ARP stands as the world's premier manufacturer of high-strength bolts, studs, nuts, and specialized hardware for racing and high-performance applications.</p> <p>ARP controls all aspects of the manufacturing process in-house, with all operations closely monitored, enabling the company to maintain its reputation for zero-defect quality. Every fastener undergoes forging, heat treatment, thread rolling, and precision finishing at ARP's Southern California facilities, which span over 115,000 square feet. This vertically integrated approach ensures that each component meets exacting standards for strength, fatigue resistance, and reliability under extreme conditions.</p> <h3>Engineered for Championship Performance</h3> <p>ARP's customer roster reads like a who's who of professional motorsports. The product line ranges from quality high-performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications. The company's fasteners have secured victories in virtually every major racing championship worldwide, from Top Fuel dragsters to Formula One cars, proving their worth under the most demanding conditions imaginable.</p> <p>The brand's <a href="/48-arp-engine-cylinder-head-bolt-set-10306">engine cylinder head bolt sets</a> represent the cornerstone of ARP's catalog, offering engine builders the clamping force and reliability needed to prevent head gasket failure in high-boost and high-compression applications. These precision-engineered fasteners utilize proprietary materials and heat treatments that deliver up to ten times the fatigue strength of conventional bolts, making them essential for any serious performance build.</p> <p>For engine internals, ARP manufactures <a href="/48-arp-engine-connecting-rod-5276">connecting rods</a> designed to withstand extreme cylinder pressures and high RPM loads. Each rod is manufactured to aerospace standards with tight tolerances and superior material properties. Whether you're building a street performance engine or a full competition powerplant, ARP connecting rods provide the strength and consistency that professional engine builders demand.</p> <h3>Complete Fastener Solutions</h3> <p>Beyond engine components, ARP's product range extends throughout the entire vehicle. The company's <a href="/48-arp-wheel-lug-stud-7680">wheel lug studs</a> offer critical safety and performance benefits for racing and high-performance street applications, providing greater clamping force and durability than factory studs. ARP's product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline.</p> <p>Individual <a href="/48-arp-engine-cylinder-head-bolt-5308">engine cylinder head bolts</a> are also available for custom applications or specific replacement needs, manufactured to the same exacting standards as complete sets. This flexibility allows builders to source exactly what they need for specialized builds or repairs without compromising on quality.</p> <p>What sets ARP apart is not just the breadth of their catalog, but their willingness to develop custom solutions for unique applications. The company maintains complete R&D capabilities, including metallurgical research, product design, prototype machining, and extensive laboratory testing. This engineering expertise ensures that whether you're installing a simple head stud kit or building a record-setting race engine, ARP fasteners deliver the reliability and performance that professionals trust.</p>

Part Number

400-1201
07/13/2036 1:37 AM
Sale Price

$20.23

3 left at this price

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The ARP 400-1201 is a premium 12-piece header bolt kit designed for high-performance exhaust header installation. Each bolt features a 12-point head design that allows easy socket access in tight spaces around exhaust pipes.

Key Features:

  • 12-point head design for superior wrench access and grip
  • Constructed from Stainless 300 material for exceptional corrosion and heat resistance
  • Rated at 170,000 psi tensile strength, exceeding Grade 8 hardware specifications
  • Includes premium-quality washers for proper installation
  • Complete kit with 12 pieces for your application
  • Ideal for extreme heat and corrosive exhaust environments

ARP's Stainless 300 material ensures long-lasting durability even under the most demanding conditions. The compact 12-point head configuration provides multiple wrench positions, making installation and removal easier in confined engine compartments. Each component is precision-engineered to deliver reliable clamping force and resist loosening from vibration and thermal cycling.

Products specifications

Fastener Finish

Polished

Fastener Material

Stainless steel

Fastener Style

Bolt

Head Style

12-point

Notes

3/8 in. wrench head size.

Quantity

Sold as a set of 12.

Size

3/8

Thread Size

3/8-16 in.

UHL

0.75

Underhead Length (in)

0.750 in.

Underhead Length (mm)

19mm

The part was a direct fit, took 15 minutes and worked perfect.

Thank you

fast service but the box was all messed up+ held together with tape

I will buy all my exhaust needs here.

My order was delivered on time without any issues.

Fast and easy

Definitely the best price that I found for the part that I needed! Customer service was helpful and I got the piece FAST! Thank you so much!

First off, I LOVE my new shipments! These guys had everything at super low prices, and the shipping was phenomenally fast. It's all working great, and imm definitely buying from these guys again.

Seller had the best price online for the item I wanted! Responded to emails within 24 hours as stated, and sent me my tracking info as soon as part shipped. Thanks Autoplicity!

Easy checkout process.

Ordered a Trac-Bar from Autoplicity, and didn't have any problems. WILL be back!

Fast Shipping and best price around!Will buy thier again order#7585

Product (Dee-Zee nerf bars) was exactly as advertised. Buying experience was great. I did contact customer service via email to find out the shipping information. They were very helpful and replied within a few hours.

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