ARP M9in ARP Polished Stainless Steel 12-pt Nut Kit

SKU: 400-8312 | UPC: 672036045388

ARP Polished Stainless Steel 12-pt Nut Kit M9 x 1.25 for 88-05 Honda Civic/Acura Integra B/D-Series

This ARP 400-8312 nut kit includes 10 polished stainless steel 12-point nuts sized M9 x 1.25, designed for ARP head stud kits and engine hardware in Honda B-series and D-series engines. Found in 1988-2005 Civic, Del Sol, CRX, Integra models, these nuts deliver secure fastening under extreme torque and heat in performance applications. Their 180,000 PSI tensile strength ensures dependable clamping force for cylinder heads and other critical components.

Key Features

• ARP Stainless Steel Construction: Resists corrosion and maintains integrity in high-heat engine environments for long-term reliability
• Polished Finish: Provides a brilliant luster that resists tarnishing and enhances visual appeal in show or race engines
• 12-Point Design: Offers precise engagement and higher torque capacity compared to standard hex nuts, reducing rounding risk
• M9 x 1.25 Thread Size: Perfect match for ARP head studs in B/D-series Honda engines, ensuring exact fit without play
• 180,000 PSI Tensile Strength: Handles boosted and high-RPM demands, preventing fastener failure in competitive racing

Product Notes

• Use with ARP bolts or studs rated for similar strength to achieve full performance
• Store in dry conditions to preserve polished finish
• Ships in protective packaging to prevent damage

Installation Notes

• Professional installation recommended.
• Torque to ARP specifications (typically 25-30 ft-lbs dry for head nuts. check kit instructions)
• Compatible with ARP 208-4301/4305 head stud kits. lubricate threads for accurate torque

This Part Fits

Year	Make	Model	Submodel
1988-1991	Acura	Integra	LS/GS/RS
1988-1991	Honda	Civic	DX/LX/Si/CRX HF/Si
1988-1991	Honda	CRX	Si/HF
1990-2001	Acura	Integra	GS-R Type R
1992-2000	Honda	Civic	Si EX
1992-1995	Honda	Del Sol	Si VTEC
1999-2005	Honda	Civic	Si EM2

Why Choose ARP?

• ARP sets the standard for racing fasteners trusted by NHRA and NASCAR teams
• Every nut undergoes rigorous quality testing for consistent performance
• Precision machining ensures perfect thread fit and repeatable torque values

Frequently Asked Questions

• Q: Does this fit Honda B18C head studs?
  A: Yes, the M9 x 1.25 size matches ARP head stud kits like 208-4305 for B16/B18 engines in 1990-2001 Integra GS-R and Civic Si
• Q: What makes the stainless steel different from chrome moly?
  A: Stainless offers superior corrosion resistance and polished aesthetics while matching 180,000 PSI strength for track or street use
• Q: Is a torque wrench required for installation?
  A: Yes, use a calibrated torque wrench and ARP thread lube for heads. follow ARP torque specs to avoid over/under tightening

Shipping & Handling

• Method: UPS Ground or USPS Priority
• Availability: In stock – ships same or next business day
• Packaging: Compact protective box 4in x 4in x 1in
• Weight: 0.2 lbs