SKU: 300-8343
ARP 10mm x 1.25 16mm OD 12pt Nut (1 piece) for Honda B-Series Subaru EJ Nissan SR20
This ARP 12-point nut features 10mm x 1.25 threads and 16mm OD for secure fastening in performance engine builds. It fits ARP head stud kits on Honda B-series D-series Subaru EJ20 EJ25 Nissan SR20DET Mitsubishi 4G63 engines. Provides consistent clamp load to maintain head gasket seal under high boost and RPM.
Key Features
- 12-Point Head Design: Ensures positive wrench grip to apply torque accurately without slipping or rounding
- Precise Metric Sizing: 10mm x 1.25 threads match OEM replacements and ARP studs for flawless fit
- 16mm Outer Diameter: Clears cylinder head spaces while accepting standard 12pt sockets
- 8740 Chromoly Construction: Heat-treated to 200,000 PSI tensile strength for extreme pressure resistance
- 0.669 Inch Height: Optimized profile distributes load evenly across washers and studs
Product Notes
- Inspect stud condition and thread pitch prior to installation
- Store in dry area to prevent corrosion on unused hardware
- Lightweight design ships economically with minimal packaging
Installation Notes
- Professional installation recommended.
- Clean all threads and apply ARP Ultra-Torque lubricant
- Use 16mm 12-point socket and follow ARP torque specs sequence
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1988-2001 | Honda | Civic | Si EX |
| 1989-2001 | Honda | Integra | GSR Type R |
| 1991-2002 | Nissan | 240SX | SE S14 |
| 1999-2014 | Subaru | Impreza | WRX STI |
| 1989-1999 | Mitsubishi | Eclipse | GSX |
| 1989-1999 | Mitsubishi | Talon | TSi |
Why Choose ARP?
- Proven hardware used in NHRA IHRA and Formula Drift racing
- Manufactured from premium alloys with exact heat treatment
- Precision machined in USA for repeatable performance
Frequently Asked Questions
- Q: Which ARP head stud kits use this nut?
A: Fits kits like 200-4705 Honda B-series 206-3605 K-series 204-4301 Subaru EJ20 208-4301 Nissan SR20 for 10mm x 1.25 studs - Q: What material and socket size?
A: 8740 chromoly steel requires 16mm 12-point socket tall 0.669 inches for full engagement - Q: What torque specs apply?
A: Consult ARP instructions for application use Ultra-Torque lube re-torque after 500 miles or heat cycles
Shipping & Handling
- Method: USPS First Class or UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Protective poly bag in 4 x 3 x 1 inch box
- Weight: 0.05 lbs
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