300-8363 | ARP M10 x 1.25 12pt Nut Kit (10 pack) replaces AMN12-1

Upgrade or replace your engine hardware nuts with the ARP 300-8363 M10 x 1.25 12-point nut kit. This 10-piece kit is made from premium 8740 chromoly and is designed for high-performance engine builds, stud kits, and custom hardware applications that require M10 x 1.25 12-point nuts.

ARP 12-point nuts are commonly used in performance engine assembly where stronger, more consistent hardware is preferred over standard OE-style fasteners. The compact 12-point design works well in tighter engine bay and cylinder head areas where standard hex hardware may have less tool clearance.

Replaces

This ARP part replaces the older ARP part number AMN12-1.

Features

• Genuine ARP 12-point nut kit

• ARP part number: 300-8363

• Replaces old ARP part number: AMN12-1

• Thread size: M10 x 1.25

• Socket size: 12mm 12-point

• Material: 8740 chromoly

• Quantity: 10 nuts

• Designed for performance engine hardware applications

• Useful for engine builds, stud kits, and custom fastener setups

• Stronger upgrade over many standard OE-style nuts

Fitment / Use

Universal hardware application for compatible M10 x 1.25 threaded studs or bolts.

Common uses include:

Engine stud hardware
Cylinder head hardware
Exhaust or manifold hardware
Performance engine assembly
Custom racing hardware setups
Replacement nuts for compatible ARP kits

Important Fitment Note

This is a universal fastener kit. Confirm thread pitch, stud diameter, nut seat style, socket clearance, torque specification, and application requirements before ordering. This is not a vehicle-specific kit.

What’s Included

• 10 ARP M10 x 1.25 12-point nuts

• Part number: 300-8363