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Demon Tweeks£19.94Visit shop ARP Imperial High Tensile Nuts - 12 Point - 1/4"-28 - 5/16" Socket Size Pack Of 10
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This guide is for automotive enthusiasts and professional mechanics working on high-stress applications. The ARP High Tensile Nuts offer superior clamping force and reliability due to their high-strength materials and robust design. A key consideration is ensuring correct thread pitch and size for your specific application to avoid cross-threading or damage.
| Colour | Black |
|---|---|
| Model Part Number | 300-8331 |
| Brand | ARP |
The term 'high tensile' refers to the material's ability to withstand high pulling force before breaking. These nuts are made from 8740 Chrome Moly steel and are rated to 180,000 psi tensile strength, significantly higher than standard hardware nuts.
The 12-point head provides double the wrenching access points compared to a standard 6-point head. This is especially useful in confined spaces where it may be difficult to seat a socket or wrench, and it offers a more secure grip.
While they may thread onto non-ARP bolts, they are specifically engineered and recommended for use with ARP High Tensile Bolts to ensure optimal performance and safety due to matched material strength and tolerances.
PSI stands for Pounds per Square Inch. The 180,000 psi rating indicates the maximum tensile stress the material can withstand before it begins to deform permanently or break.
You need to know the thread size and pitch of the bolt or stud you are using (e.g., 5/16"-24 means a 5/16 inch diameter with 24 threads per inch). The socket size (e.g., 3/8") is also critical for proper tool fitment.
These nuts are designed for high-stress applications like racing or performance builds. For standard, everyday driving where loads are not extreme, they may be overkill, but they will certainly provide a very secure fastening solution.
Store them in a dry environment. Using a small parts organizer or keeping them in their original packaging can prevent them from scratching against other metal items, preserving the black oxide finish.
Verify the thread size and pitch are identical. Ensure threads on both the nut and fastener are clean and free of debris or damage. Do not force the nut; this can damage threads. Check for cross-threading.
Ensure you are using the correct size socket for the nut's 12-point head. Use a 6-point socket if a 12-point socket is not available and fits snugly, but a 12-point socket is preferred for optimal grip. Make sure the socket is fully engaged.
The black oxide finish is protective but can be scratched. Avoid abrasive cleaners. If rust appears, clean gently with fine steel wool and apply a light coat of oil or a rust preventative. Store in a dry environment.
Setup: Ensure the thread size and pitch of the ARP nut precisely match the threaded stud or bolt. Clean both the threads of the fastener and the inside of the nut before installation. Apply a quality lubricant or thread locker as recommended by the fastener manufacturer or your specific application's service manual.
Compatibility: These nuts are designed to be used with ARP High Tensile Bolts and studs. While they may thread onto other fasteners, using them with non-ARP or lower-grade fasteners can compromise the integrity of the joint and is not recommended. Always verify the thread size (e.g., 5/16"-24) and socket size (e.g., 3/8") match your application requirements.
Care: To maintain the black oxide finish, avoid prolonged exposure to moisture and corrosive environments. Clean with a dry or slightly damp cloth. If rust appears, it can often be removed with a fine steel wool and re-treated with a rust inhibitor or light oil. Inspect nuts for any signs of damage or cross-threading before each use.
