ARP Fasteners UK

ARP hardware is built around clamp load consistency, repeatability and long-term reliability. Use our filters to find the exact studs, bolts, rod bolts, wheel studs and assembly essentials for your build.

Material options

8740, ARP2000, L19 and super-alloys selected by duty cycle and environment.

Clamp load consistency

Installation method and lubricant choice are key to repeatable preload across torque cycles.

Built for builders

Filters and search help you land on the right thread, length and category fast.

UK stock focus

Performance fastener categories curated for UK buyers, with clear part selection pathways.

Find the exact ARP hardware in seconds

Your build is specific. Thread pitch, under-head length, washer selection, material grade, and the difference between a bolt kit and a stud kit all matter. Use the on-page search and filters to narrow by fastener type, application intent, thread spec and dimensions, without scrolling through near-matches.

How to use the filters

  • Looking for parts for a specific Engine: Just type in LS3 or LT and the items that suit will be shown.
  • Get specific: filter by thread, length and kit style to remove near-matches.

ARP material grades explained

Material choice should follow the duty cycle of the build: load, RPM, temperature, corrosion exposure, and how frequently the assembly will be serviced. The objective is not maximum tensile strength on paper, but predictable clamp load and long-term reliability in the real world.

8740 Chrome Moly

A proven performance alloy used across many motorsport fastener applications. Ideal when you need a strong, durable option backed by consistent manufacturing and correct installation discipline.

Typical use cases

  • Street and track builds
  • General performance upgrades
  • Where robust fatigue resistance is required

ARP2000

A higher strength option often selected where increased clamp load is beneficial. A strong choice for more demanding combinations where load and service requirements justify the upgrade.

Typical use cases

  • Higher cylinder pressure combinations
  • More aggressive track use
  • Builders prioritising additional clamp margin

L19 and Super-Alloys

Used where extreme load and endurance considerations matter. Higher strength options suit higher demand, while correct handling and installation practice remain essential.

Typical use cases

  • High RPM endurance builds
  • Race engines with frequent inspection cycles
  • Where the application justifies specialist materials

Stainless and specialty materials

For environments where corrosion resistance is a priority, material selection becomes an exposure decision as much as a load decision. Use filters to select the relevant material option where available within your required fastener family.

Selection shortcut

Start with the fastener type, then apply material filters. If you are torn between options, choose the grade that matches service interval, exposure, and load.

Installation discipline: the difference between “tight” and “correct”

Torque is a proxy for bolt tension and is influenced by friction, lubrication, thread condition, seating, and component compression. Where practical, measuring stretch is the most direct way to confirm clamp load.

Stretch, torque, and repeatability

For accessible fasteners such as rod bolts, stretch measurement is the most accurate method to confirm preload. If torque is used, consistency in lubricant and technique becomes the controlling factor.

  • Use the same lubricant each time for comparable results.
  • Keep threads clean and free from debris or damage.
  • Follow a consistent sequence and technique, not a rushed guess.

Thread prep and cleanliness

Dirty threads, burrs, damaged seating surfaces, and inconsistent lubrication increase friction variability and preload scatter. This is where fastener quality meets builder discipline.

Practical checklist

  • Clean male and female threads thoroughly.
  • Confirm full engagement and correct seating.
  • Use Ultra-Torque where specified for consistent friction behaviour.
Add a short graphic here if you want: "Torque vs Stretch" explainer or "Preload scatter" visual.

This guidance is not a substitute for ARP instructions supplied with specific fasteners. Always follow the instructions for the exact kit and application.

ARP Ultra-Torque: consistency you can measure

Ultra-Torque is designed to reduce preload scatter and improve repeatability during assembly and reassembly. If your build depends on predictable clamp load, treat lubricant choice as part of the fastener system, not an afterthought.

Where it helps most

  • Head studs and main studs where consistency across multiple fasteners matters.
  • Builds that are assembled more than once and need repeatable results.
  • Reducing friction variability when torque is the chosen method.

ARP wheel studs: fitment, interference, and hub preparation

Wheel studs are safety-critical. Correct press-fit installation depends on selecting the correct knurl diameter for the hub and ensuring the hub is prepared properly. Use filters to match thread spec and dimensions, then confirm hub compatibility before installation.

Fitment and selection

  • Match thread pitch to your lug nuts and wheel design.
  • Choose length based on spacers, wheel thickness, and required engagement.
  • Select the correct knurl diameter for press-fit retention.

Installation discipline

  • Confirm the stud seats correctly and squarely.
  • Ensure holes are clean and correctly sized.
  • Avoid damaging threads during install, then torque consistently.

ARP Fasteners FAQ

Should I torque or measure stretch on rod bolts?
Where practical, measuring stretch is the most accurate method for achieving correct clamp load on rod bolts, especially for high RPM use. If torque is used, keep lubricant type and technique consistent to reduce preload scatter.
How do I choose between 8740, ARP2000 and L19?
Choose based on duty cycle and environment. Higher strength options suit higher demand, while correct handling and installation practice remain essential across all grades. Start with the fastener family, then apply material filters to see the options for your application.
Do I need a specific lubricant for ARP fasteners?
Lubricant selection changes friction behaviour and preload consistency, which affects achieved clamp load. Use the lubricant recommended for the kit you are installing, and keep it consistent if you want repeatable results.
How do I find the correct ARP part quickly?
Start with the fastener type, then filter by thread spec and dimensions. If relevant, select a material grade suited to the duty cycle and add Ultra-Torque for consistent preload practice.
Is this page a substitute for the instructions included with my ARP kit?
No. This page is a selection and buying guide. Always follow the instructions supplied with your exact ARP kit and application.

Shop ARP in the UK with confidence

Use filters to narrow to the exact thread, length and fastener type, then assemble with consistent practice. If you are building for high load or high RPM, start with material selection, then refine to the correct part using the Product Finder.