{"product_id":"esse-werks-differential-ring-gear-bolt-kit","title":"Esse Werks Differential Ring Gear Bolt Kit — BMW\/MINI F","description":"\u003cp\u003e\u003cstrong\u003eEsse Werks differential ring gear bolt kit, manufactured by ARP to ARP2000 spec, for the BMW\/MINI transverse-platform differential.\u003c\/strong\u003e Replaces the OEM torque-to-yield bolts BMW specifies for one-time use only — bolts that are not safe to reuse on reassembly.\u003c\/p\u003e\n\n\u003ch3\u003eWhy TTY bolts fail at diff rebuilds\u003c\/h3\u003e\n\u003cp\u003eThe OEM ring gear bolts are torque-to-yield by design. They're stretched past their elastic limit on initial torque-down, which creates even clamping force across the ring gear face but consumes the bolt's ability to stretch a second time. Reuse them on an LSD install or a service teardown and they either lose clamp force — gear face slips, hammer wear starts on the ring — or they break in the head during the second torque application. BMW's service manual is explicit: replace TTY bolts on every reassembly. ARP2000 is the more durable answer.\u003c\/p\u003e\n\n\u003ch3\u003eWhat ARP2000 brings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile strength ~220,000 psi\u003c\/strong\u003e — well above the OEM TTY bolt's working range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable\u003c\/strong\u003e — proper torque-to-spec with ARP's ULTRA-TORQUE lubricant; no stretch-to-yield needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolds clamp under thermal cycling\u003c\/strong\u003e — track-temperature differential rebuilds stay clamped where OEM bolts have been observed to back off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame thread pitch and head geometry\u003c\/strong\u003e as the OEM bolt — no tooling changes at install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e10 × ARP2000 ring gear \/ diff cover bolts, M10×1.0 thread\u003c\/li\u003e\n\u003cli\u003eARP ULTRA-TORQUE assembly lubricant\u003c\/li\u003e\n\u003cli\u003eTorque sequence and spec sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eBMW and MINI transverse-platform differential — found across the F-series UKL2 chassis lineup:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMINI F-series — F54 Clubman, F55, F56, F57, F60 Countryman\u003c\/li\u003e\n\u003cli\u003eBMW F-series — F39 X2, F45 \/ F46 2-series Active \u0026amp; Gran Tourer (EU), F48 X1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eConfirm OEM bolt part numbers against your specific differential before ordering.\u003c\/strong\u003e BMW issued running revisions to the OEM TTY bolts mid-platform. This ARP2000 kit covers both revisions. If you're on a G-chassis (longitudinal RWD \/ xDrive) BMW with a different differential casting, this kit does not fit — contact sales@essewerks.com and we'll source the right ARP kit for your application.\u003c\/p\u003e\n\n\u003ch3\u003eInstall\u003c\/h3\u003e\n\u003cp\u003e0.5 hrs assuming the differential is already out of the car — LSD install, gear set change, service teardown. Use the included ARP ULTRA-TORQUE lubricant on threads and under the bolt head, follow ARP's torque sequence, torque in three passes per the included spec sheet.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this kit does not include\u003c\/h3\u003e\n\u003cp\u003eBolts only. A complete diff reassembly typically also requires pinion crush sleeve, pinion seal, axle seals, and ring-gear-to-carrier shims — all sourced separately. Esse Werks can quote the full hardware list at intake.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eARP × Esse Werks.\u003c\/strong\u003e Manufactured by ARP (Automotive Racing Products, Ventura, California — Made in the USA). Esse Werks spec, ARP build, ARP manufacturer warranty pass-through.\u003c\/p\u003e","brand":"ARP × Esse Werks","offers":[{"title":"Default Title","offer_id":43280682418237,"sku":"EW-DRV-ARPBOLTS-RING","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/f56_flywheel_bolts_BLK01.png?v=1781742738","url":"https:\/\/essewerks.com\/products\/esse-werks-differential-ring-gear-bolt-kit","provider":"Esse Werks","version":"1.0","type":"link"}