ARP M10 x 1.25 Locking Flange Nut Kit (10 pack)

SKU: 200-8683 | UPC: 672036033521

ARP M10 x 1.25 Locking Flange Nut Kit (10 Pack) for Honda Civic/Acura RSX/Integra B/K-Series, Subaru WRX/STI Exhaust

This ARP M10 x 1.25 locking flange nut kit contains 10 high-performance 12-point nuts designed to secure exhaust manifolds and headers on popular import performance engines. It fits Honda Civic models from 1988-2011 with B-series and K-series engines, Acura Integra/RSX, and Subaru Impreza WRX/STI for reliable fastening in street and track use. The nuts deliver consistent clamp load to prevent leaks and loosening during repeated heat cycles.

Key Features

• 12-Point Flange Design: Ensures positive engagement with sockets and even load distribution across flange surfaces for secure header mounting
• Integrated Locking Mechanism: Prevailing torque feature resists back-off from engine vibration and thermal expansion/contraction
• Precision M10 x 1.25 Threads: Direct replacement for OEM studs on Honda B/D/K-series, Acura, and Subaru EJ applications with exact fit
• High-Strength Alloy Steel: ARP proprietary material withstands 200,000+ psi tensile strength for long-term durability in racing conditions
• Black Oxide Finish: Provides corrosion protection in harsh underhood environments exposed to moisture and road salt

Product Notes

• Kit contains exactly 10 nuts suitable for one typical 4-2-1 or log-style manifold
• Matches ARP header stud kits like 208-4301 for Honda B-series or 208-4305 for K-series
• Store in dry location to maintain thread integrity before installation

Installation Notes

• Professional installation recommended.
• Clean studs and nuts with brake cleaner. apply ARP Ultra-Torque lubricant to threads and under flange
• Use 15mm/16mm 12-point socket. torque in cross-pattern sequence to ARP specs (typically 25-35 ft-lbs depending on studs)

This Part Fits

Year	Make	Model	Submodel
1988-1991	Honda	Civic	D-Series
1992-2000	Honda	Civic	B-Series
1990-2001	Acura	Integra	B18
2002-2006	Acura	RSX	K20
2006-2011	Honda	Civic	Si K20
2002-2007	Subaru	Impreza	WRX EJ20/EJ25
2004-2021	Subaru	Impreza	WRX STI EJ25
1994-2005	Mazda	MX-5 Miata	NA/NB

Why Choose ARP?

• Proven in NHRA, SCCA, and Formula Drift racing teams for mission-critical bolting
• Every batch undergoes rigorous tensile and fatigue testing beyond SAE standards
• Thread rolling process delivers smoother engagement and higher preload accuracy

Frequently Asked Questions

• Q: Do these fit aftermarket headers on a 2000 Civic B16?
  A: Yes, M10 x 1.25 matches most Skunk2, DC Sports, and ARP stud kits for B-series swaps and OEM replacements.
• Q: What is the material and finish?
  A: Forged from ARP 2000 alloy steel rated over 200,000 psi with black oxide plating for rust resistance and reduced galling.
• Q: What torque specs and tools are needed?
  A: Torque 25-35 ft-lbs with ARP lube using a 12-point socket. recheck after 100 miles or first heat cycle.

Shipping & Handling

• Method: UPS Ground or USPS First Class
• Availability: In stock – ships same or next business day
• Packaging: Sealed poly bag in 4 x 3 x 1 inch corrugated box
• Weight: 0.25 lbs