{"product_id":"pro-series-n55-e82-e90-f10-f30-oem-cylinder-head-stud-set-inc-m135i-335i-535ix-740i","title":"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","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch3\u003ePro Series PS 18.8 Head Fastening Kit for BMW N55\u003c\/h3\u003e\n\n  \u003cp\u003e\n    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.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    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.\n  \u003c\/p\u003e\n\n  \u003ch4\u003eWhy switch from factory bolts\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eHelps prevent head lift when increasing boost and power\u003c\/li\u003e\n    \u003cli\u003eStable clamping through repeated heat cycles and heavy load\u003c\/li\u003e\n    \u003cli\u003eReusable hardware, unlike torque to yield bolts\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eHighlights\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003ePS 18.8 steel with 1850+ N\/mm² tensile strength, 270,000+ PSI\u003c\/li\u003e\n    \u003cli\u003eRolled threads for increased flank strength and durability\u003c\/li\u003e\n    \u003cli\u003eNickel plated finish for corrosion resistance\u003c\/li\u003e\n    \u003cli\u003eInternal hex drive for easy installation and removal\u003c\/li\u003e\n    \u003cli\u003eCone seat on the block side supports in the bore to protect block threads over multiple builds\u003c\/li\u003e\n    \u003cli\u003eMatching high strength nuts and washers included\u003c\/li\u003e\n    \u003cli\u003eManufactured in Germany for precision and reliability\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eWhat you get in the box\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e4 x M9 studs\u003c\/li\u003e\n    \u003cli\u003e10 x M11 studs\u003c\/li\u003e\n    \u003cli\u003e4 x M9 nuts\u003c\/li\u003e\n    \u003cli\u003e10 x M11 nuts\u003c\/li\u003e\n    \u003cli\u003e14 x washers\u003c\/li\u003e\n    \u003cli\u003eAssembly paste\u003c\/li\u003e\n    \u003cli\u003eAssembly instructions\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eVehicle applications\u003c\/h4\u003e\n  \u003cp\u003eDirect fit for BMW models equipped with the N55 engine:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 Series, E82 E88 135i, F20 F21 M135i M135ix, F20 LCI F21 LCI M135i M135ix\u003c\/li\u003e\n    \u003cli\u003e2 Series, F22 F23 M235i M235ix\u003c\/li\u003e\n    \u003cli\u003e3 Series, E90 LCI E91 LCI E92 LCI E93 LCI 335i 335xi, F30 335i 335ix Hybrid 3, F31 335i 335ix, F34 GT 335i 335ix\u003c\/li\u003e\n    \u003cli\u003e4 Series, F32 F33 F36 435i 435ix\u003c\/li\u003e\n    \u003cli\u003e5 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\u003c\/li\u003e\n    \u003cli\u003e6 Series, F06 Gran Coupé 640i 640ix, F06 LCI 640i 640ix, F12 640i 640ix, F12 LCI 640i 640ix, F13 640i 640ix, F13 LCI 640i 640ix\u003c\/li\u003e\n    \u003cli\u003e7 Series, F01 LCI 740i Hybrid 7, F02 LCI 740Li 740Lix Hybrid 7L\u003c\/li\u003e\n    \u003cli\u003eX 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\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eSpecifications\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eTensile strength: PS 18.8 steel, 1850+ N\/mm², 270,000+ PSI\u003c\/li\u003e\n    \u003cli\u003eFinish: Nickel plated\u003c\/li\u003e\n    \u003cli\u003eThreads: Rolled\u003c\/li\u003e\n    \u003cli\u003eReusability: Yes\u003c\/li\u003e\n    \u003cli\u003ePart number: P102061410\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eFitting and support\u003c\/h4\u003e\n  \u003cp\u003e\n    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.\n  \u003c\/p\u003e\n\n  \u003ch4\u003eSearch friendly terms\u003c\/h4\u003e\n  \u003cp\u003e\n    BMW N55 head fasteners, N55 top end hardware, head clamp kit for N55, bolt to stud conversion, performance engine fasteners, turbo six cylinder fastening kit, rolled thread studs for N55, nickel plated studs and nuts set, PS 18.8 stud kit, 1850 N\/mm² head fixings, 270000 PSI engine hardware, reusable head hardware, German engineered fastener upgrade, high boost head clamping solution, track day engine build parts, gasket sealing hardware, E82 E90 F10 F30 N55 fastener kit, M135i 335i 435i 535i 640i 740i engine build components.\n  \u003c\/p\u003e\n\n  \u003ch4\u003eBrand\u003c\/h4\u003e\n  \u003cp\u003ePro Series\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Pro Series","offers":[{"title":"Default Title","offer_id":56006641746306,"sku":null,"price":733.28,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/ProSeriesN55E82E90F10F30OEMCylinderHeadStudSet_Inc.M135i_335i_535iX_740i_-1_1946x_8aa0d326-cb20-44fc-8ed1-0181fe719f08.jpg?v=1764059533","url":"https:\/\/mjmodifications.co.uk\/products\/pro-series-n55-e82-e90-f10-f30-oem-cylinder-head-stud-set-inc-m135i-335i-535ix-740i","provider":"MJ Modifications","version":"1.0","type":"link"}