SKU: 301-8400 | UPC: 672036045357
ARP M12x1.25 8740 Black Oxide 12-pt Nut Kit (25 Pack)
Secure your high-performance engine builds with the ARP M12x1.25 12-point nut kit featuring 8740 chrome moly steel construction and black oxide finish. These nuts fit ARP head studs and main studs on popular engines like Subaru EJ-series in WRX STI Impreza and Honda K20 K24 in Civic Si RSX. Rated at 180,000 PSI tensile strength they handle extreme torque and heat in racing or street applications.
Key Features
- 8740 Chrome Moly Steel: Forged for 180,000 PSI tensile strength to withstand high cylinder pressures and boost levels
- 12-Point Design: Delivers 12 contact points for positive wrench grip and prevents fastener rounding during high-torque assembly
- Black Oxide Finish: Provides corrosion resistance and reduced friction for smoother installation and long-term durability
- Thick Wall Construction: Ensures maximum rigidity and strength in space-available applications like cylinder heads and mains
- 25-Piece Kit: Bulk quantity covers full engine sets or spares for Subaru EJ Honda K-series and other M12x1.25 setups
Product Notes
- Confirm M12x1.25 thread match on your ARP studs before ordering
- Store in dry conditions to maintain black oxide protection
- Kit arrives sealed for protection during transit
Installation Notes
- Professional installation recommended.
- Apply ARP Ultra-Torque assembly lube to threads and under nuts for precise torque values
- Directly compatible with ARP head studs mains and rod bolts in M12x1.25 applications
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Honda | Civic | Si (EP3 K20A3) |
| 2002-2006 | Acura | RSX | Type-S (K20A2) |
| 2006-2011 | Honda | Civic | Si (K20Z3) |
| 2004-2021 | Subaru | Impreza | WRX STI (EJ25) |
| 2002-2007 | Subaru | WRX | (EJ20 EJ25) |
| 1999-2005 | Mitsubishi | Lancer | Evolution (4G63) |
Why Choose ARP?
- Trusted by NHRA Top Fuel and Formula 1 teams for mission-critical fastening
- Every nut forged heat-treated and machined to exacting tolerances
- Made in USA with rigorous quality control for reliability in every build
Frequently Asked Questions
- Q: What thread specification do these nuts fit?
A: Precisely threaded M12 x 1.25 to match ARP metric studs in head main and accessory applications - Q: How many nuts come in this kit and what is the material?
A: Kit includes 25 nuts made from premium 8740 chrome moly steel with 180,000 PSI rating and black oxide coating - Q: What warranty does ARP provide?
A: ARP warrants against manufacturing defects with replacement coverage when installed and torqued correctly
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Compact protective box 6 x 4 x 1 inches
- Weight: 0.31 lbs
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