Wagner Tuning Nickeled Head Stud Set for Exx BMW 320i / 520i

The Wagner Tuning Nickeled Head Stud Set for Exx BMW 320i / 520i is a premium engine hardware upgrade designed to provide maximum strength and reliability for BMW M20-powered models. Manufactured in Germany from specially developed high-strength steel and finished with a durable nickel coating for superior corrosion protection, these Pro-Series 18.8 stud bolts deliver significantly improved clamping force over factory head bolts to help prevent head lift under increased power and stress. Precision-engineered with rolled threads for enhanced durability and long-term performance, this complete stud kit is ideal for high-performance street builds, turbo conversions, and motorsport applications requiring uncompromising engine stability.

High-Quality Materials and Production

• Wagner Tuning manufactures its Pro-Series 18.8 stud bolt sets in Germany using a specially developed high-strength steel that achieves a tensile strength of over 1,850 N/mm² after tempering. Rather than using conventional cut threads, all threads are precision-rolled, increasing thread flank strength by approximately 30% for superior durability. Each Pro-Series product is finished with a corrosion-resistant nickel coating or, optionally, a burnished treatment, ensuring long-term protection and reliable performance even under the most demanding operating conditions.

Easy Installation and Durability

• Wagner Tuning engineers its Pro-Series stud bolts with an integrated hex socket drive on the head side for precise and easy installation. A conical section on the engine block side ensures that, when tightened, the nuts seat correctly in the threaded bore rather than on the thread flanks, protecting the threads during frequent assembly and disassembly in racing applications. One of the key advantages of Wagner Tuning’s Pro-Series over other manufacturers is the inclusion of matching high-strength nuts and, where required, washers in each kit, all rated to the same 1,850 N/mm² tensile strength standard.

Features

• High-strength studs designed for performance and racing applications
• Specially developed for superior tensile strength
• Provides long-term corrosion resistance
• Helps prevent cylinder head lift under increased power or boost
• Stronger and more durable than conventional cut threads
• Allows easy and precise installation
• Prevents thread damage during repeated engine assembly
• Fits BMW M20 engines without modifications
• Ideal for street, track, and motorsport builds

Specifications

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

What’s Included

• M10 Studs (14)
• M10 Nuts (14)
• Washers (14)
• Assembly lubricant
• Assembly instructions

Applications

• BMW 320i: E21, E30 | 1977-1992 |  2.0L M20 I6
• BMW 520i: E12, E28, E28, E34 | 1977-1990 | 2.0L M20 I6

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.