Wagner Tuning Burnished Head Stud Set for 991 Porsche 911 Turbo

The Wagner Tuning Burnished Head Stud Set for the 991 Porsche 911 Turbo is engineered to provide the clamping strength required for high-performance and high-boost applications. Featuring a black oxide burnished finish, this kit replaces the factory cylinder head bolts with Pro-Series 18.8 high-strength stud bolts rated at an impressive tensile strength of 1850 N/mm², effectively preventing bolt elongation and cylinder head lift under extreme operating conditions. Designed as a critical upgrade for significant power increases, these reusable stud bolts offer superior durability and reliability while eliminating the need for replacement after disassembly, making them an ideal solution for both performance builds and long-term engine stability.

High-Quality Materials and Production

• Wagner Tuning produces its Pro-Series 18.8 stud sets in Germany using specially developed high-strength steel. Following heat treatment, the studs achieve a tensile strength of more than 1850 N/mm². All threads are rolled rather than cut, a process that increases thread flank strength by approximately 30%. Each Pro-Series fastener is finished with a black oxide burnished coating, providing durable corrosion protection even in extreme operating environments.

Easy Installation and Durability

• Wagner Tuning engineers the Pro-Series stud bolts with an internal hex drive on the cylinder head side to enable accurate and controlled installation. On the engine block side, a conical support section ensures load transfer occurs against the bore instead of the thread flanks when the nuts are tightened, helping to preserve engine block threads during repeated assembly. Each kit is supplied with matching high-strength nuts and, where applicable, washers that meet the same 1850 N/mm² tensile strength specification, offering a significant durability advantage over many alternative fastener solutions.

Features

• Pro-Series 18.8 high-strength head stud design
• Burnished 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: Burnished (black oxide)

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 nickel-plated 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.