BMW N55 Cylinder Head Stud Kit - Pro Series 18.8, OEM Replacement Upgrade, German Made - E82 E90 F10 F30 - M135i 135i 235i 335i 435i 535i 640i 740i

Pro Series PS 18.8 Head Fastening Kit for BMW N55

Lock in dependable sealing on your turbocharged N55 with this German engineered head fastening upgrade. Designed as a direct swap for the factory stretch bolts, this stud and nut set provides consistent clamping force for tuned road cars and track builds that see sustained heat and boost. Perfect for popular N55 models across E and F chassis including M135i, 135i, M235i, 335i, 435i, 535i, 640i and 740i.

We run these fasteners on our own in-house builds and the feedback from MJ Modifications customers has been excellent. Fit and finish are top tier, installation is straightforward, and the long term reliability under higher cylinder pressures inspires confidence on hard driven cars.

Why switch from factory bolts

• Helps prevent head lift when increasing boost and power
• Stable clamping through repeated heat cycles and heavy load
• Reusable hardware, unlike torque to yield bolts

Highlights

• PS 18.8 steel with 1850+ N/mm² tensile strength, 270,000+ PSI
• Rolled threads for increased flank strength and durability
• Nickel plated finish for corrosion resistance
• Internal hex drive for easy installation and removal
• Cone seat on the block side supports in the bore to protect block threads over multiple builds
• Matching high strength nuts and washers included
• Manufactured in Germany for precision and reliability

What you get in the box

• 4 x M9 studs
• 10 x M11 studs
• 4 x M9 nuts
• 10 x M11 nuts
• 14 x washers
• Assembly paste
• Assembly instructions

Vehicle applications

Direct fit for BMW models equipped with the N55 engine:

• 1 Series, E82 E88 135i, F20 F21 M135i M135ix, F20 LCI F21 LCI M135i M135ix
• 2 Series, F22 F23 M235i M235ix
• 3 Series, E90 LCI E91 LCI E92 LCI E93 LCI 335i 335xi, F30 335i 335ix Hybrid 3, F31 335i 335ix, F34 GT 335i 335ix
• 4 Series, F32 F33 F36 435i 435ix
• 5 Series, F07 GT 535i 535ix, F07 LCI 535i 535ix, F10 535i 535ix Hybrid 5, F10 LCI 535i 535ix Hybrid 5, F11 535i 535ix, F11 LCI 535i 535ix
• 6 Series, F06 Gran Coupé 640i 640ix, F06 LCI 640i 640ix, F12 640i 640ix, F12 LCI 640i 640ix, F13 640i 640ix, F13 LCI 640i 640ix
• 7 Series, F01 LCI 740i Hybrid 7, F02 LCI 740Li 740Lix Hybrid 7L
• X Models, X1 E84 35ix, X3 F25 35ix, X4 F26 35ix, X5 E70 LCI 35ix 40ix, X5 F15 35i 35ix, X6 E71 35ix 40ix, X6 F16 35i 35ix

Specifications

• Tensile strength: PS 18.8 steel, 1850+ N/mm², 270,000+ PSI
• Finish: Nickel plated
• Threads: Rolled
• Reusability: Yes
• Part number: P102061410

Fitting and support

Professional installation is recommended. MJ Modifications offers fitting at our Warwickshire workshop, request a quote via info@mjmodifications.co.uk. If you would like us to confirm fitment, enter your UK registration or the last 7 of your VIN at checkout and we will run a compatibility check before dispatch.

Search friendly terms

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Brand

Pro Series