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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
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