Wagner Tuning Nickel-Plated Head Stud Set for 991 Porsche 911 Turbo

The Wagner Tuning Nickel-Plated Head Stud Set for the 991 Porsche 911 Turbo is engineered to provide the clamping strength required for high-output engine builds where factory head bolts reach their limits. This upgrade replaces the original cylinder head bolts with high-strength Pro-Series 18.8 stud bolts, designed to prevent bolt elongation and cylinder head lift under extreme operating conditions. With an exceptional tensile strength of 1850 N/mm², these nickel-plated studs deliver superior durability and reliability while supporting significant power increases. Unlike factory bolts, the Wagner Tuning head studs are reusable after disassembly, making them a robust, long-term solution for performance-focused 991 Turbo applications.

High-Quality Materials and Production

• Wagner Tuning manufactures its Pro-Series 18.8 sets in Germany using high-strength stud bolts produced from a specially developed steel. After tempering, these fasteners achieve a tensile strength exceeding 1850 N/mm². All threads are formed rather than cut, with the rolling process increasing thread flank strength by approximately 30%. Each Pro-Series component is supplied with a durable nickel coating, providing long-term corrosion protection even under extreme operating conditions.

Easy Installation and Durability

• Wagner Tuning designs the Pro-Series stud bolts with an internal hex drive on the head side to allow precise installation. A conical section on the engine block side ensures the stud supports against the bore rather than the thread flanks when the nuts are tightened, helping to protect the engine block threads during repeated assembly, particularly in racing applications. Each set includes matching high-strength nuts and, where required, washers that also meet the 1850 N/mm² tensile strength rating, offering a key advantage over many alternative solutions.

Features

• Pro-Series 18.8 high-strength head stud design
• Nickel-plated finish
• Manufactured in Germany from specially developed steel
• Rolled threads for approximately 30% greater thread flank strength
• Internal hex socket drive
• Conical seating design
• Designed to prevent cylinder head lift under high load
• Reusable studs that do not require replacement after disassembly
• Includes matching high-strength nuts and washers rated at 1850 N/mm²
• Engineered for high-performance and racing engine applications
• Set of 16 head studs

Specifications

• Construction: Pro-Series 18.8 steel
• Tensile Strength: 1850+ N/mm² (270,000+ PSI)
• Finish: Nickel-plated

What’s Included

• M12 stud bolts (16)
• M12 nuts (16)
• Washers (16)
• Lubricant for assembly
• Assembly instructions

Applications

• Porsche 911 Turbo: 991.1, 991.2 | 2013-2019 | 3.8L H6 twin-turbocharged

Notes

• Also available in a black oxide burnished finish here

About Wagner Tuning

Wagner Tuning is a Germany-based performance engineering brand specializing in high-efficiency charge-air cooling and intake solutions for modern turbocharged vehicles. Known for its competition-proven intercoolers and precision-manufactured components, Wagner Tuning combines advanced R&D, CFD analysis, and rigorous testing to deliver measurable performance gains, improved thermal stability, and long-term reliability. With a strong focus on motorsport-inspired engineering and OEM-level fit and finish, Wagner Tuning products are designed to support both high-performance street driving and demanding track use across a wide range of European and international platforms.