Why do the stock BMW eccentric bolts slip, and how does the SPL lockout kit fix it?

The stock eccentric bolts on F2X and F3X rear suspension use friction to hold position once torqued to spec. Under sustained high cornering loads, that friction can be overcome and the bolt rotates slightly, shifting toe or camber away from the set position. The SPL lockout kit replaces the eccentric with CNC-machined aluminum lockout plates and grade 10.9 bolts with lock nuts, which mechanically prevent the arm position from changing regardless of the cornering load applied.

Do I need adjustable control arms to use the SPL eccentric lockout kit?

Yes, and this is a hard requirement. Removing the eccentric bolts eliminates the factory rear toe and camber adjustment mechanism entirely. Without adjustable control arms, there is no way to set or change rear toe and camber after installation. SPL Parts specifies the SPL RTA F3X for rear toe adjustment and the SPL RUA F3X for rear camber adjustment; both are sold separately and should be installed alongside or before this lockout kit.

Does this kit cover both rear toe and camber arm positions?

Yes. The SPL EL F3X eccentric lockout kit includes lockout plates, bolts, lock nuts, and washers for both the rear toe arms and the rear camber arms, making it a complete rear eccentric lockout solution for one car in a single purchase.

Can this kit be used on a street car or is it track-only?

The kit is compatible with street cars that run a performance alignment using adjustable rear control arms. It is particularly well-suited for cars that divide time between road and track, where alignment consistency across sessions matters. On a completely stock street car with no adjustable arms and no intention of tracking the car, the factory eccentric bolts are typically sufficient and this kit would remove the ability to align the car through the standard method.

What vehicles does the SPL EL F3X fit?

This kit fits 2010-2019 F20 and F21 (1 Series), 2010-2019 F22 and F23 (2 Series), and 2011-2019 F30, F31, F32, F33, F34, F35, and F36 (3 and 4 Series).

Description

Additional Info

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BP PRICING DIFFERENCE

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Description

SPL Parts Rear Camber and Toe Eccentric Lockout Kit for F2x BMW 2 Series and F3x 3 / 4 Series

Setting a track alignment on an F2x or F3x BMW is straightforward enough. Keeping it there under cornering loads is a different problem. The factory eccentric bolts BMW uses for rear toe and camber adjustment are designed to rotate to a set position and stay put; the issue is that under sustained high cornering force, they slip. When that happens, the rear toe or camber moves away from the aligned position mid-session, and the car’s balance changes in ways the driver can feel but can’t easily identify without putting it back on an alignment rack.

Features

Eliminates stock BMW rear eccentric bolts at both rear toe arms and rear camber arms; replaces them with a mechanically locked zero-slip solution
CNC-machined 6061-T6 aluminum lockout plates; manufactured to tight tolerance specifications
Zinc-plated grade 10.9 bolts and lock nuts; significantly stronger than standard hardware and resistant to loosening under sustained load
Covers both rear toe arm and rear camber arm attachment points; complete rear eccentric lockout for one car in a single kit
Prevents rear toe and camber from shifting under high cornering loads; keeps the alignment set at the track where it was set on the rack
Made in the USA

Specifications

Material: 6061-T6 aluminum
Hardware: Class 10.9 metric
Replaces: OEM rear eccentric bolts

Applications

BMW 220d: F22, F23 | 2014-2021
BMW 225d: F22, F23 | 2014-2021
BMW 220i: F22, F23 | 2014-2021
BMW 228i: F22, F23 | 2014-2016
BMW 230i: F22, F23 | 2016-2021
BMW 240i: F22, F23 | 2016-2021
BMW 316d: F30, F31 | 2012-2019
BMW 318d: F30, F31 | 2012-2019
BMW 320d: F30, F31 | 2012-2019
BMW 325d: F30, F31 | 2012-2019
BMW 330d: F30, F31 | 2012-2019
BMW 335d: F30, F31 | 2012-2019
BMW 330e: F30, F31 | 2015-2019
BMW 316i: F30, F31 | 2012-2019
BMW 318i: F30, F31 | 2012-2019
BMW 320i: F30, F31 | 2012-2019
BMW 328i: F30, F31 | 2012-2016
BMW 330i: F30, F31 | 2016-2019
BMW 335i: F30, F31 | 2012-2015
BMW 340i: F30, F31 | 2015-2019
BMW 420d: F32, F33, F36 | 2014-2020
BMW 425d: F32, F33, F36 | 2014-2020
BMW 430d: F32, F33, F36 | 2014-2020
BMW 435d: F32, F33, F36 | 2014-2020
BMW 420i: F32, F33, F36 | 2014-2020
BMW 428i: F32, F33, F36 | 2014-2016
BMW 430i: F32, F33, F36 | 2016-2020
BMW 435i: F32, F33, F36 | 2014-2016
BMW 440i: F32, F33, F36 | 2016-2020
BMW M235i: F22, F23 | 2014-2016
BMW M240i: F22, F23 | 2016-2021
BMW M340i: F30, F31 | 2019-2019

Complete the Kit

Notes

SPL components are made-to-order in the USA; build time will be confirmed at the time of order
A full rear alignment is required after installation
Adjustable rear control arms are required after installation; SPL Parts specifies the SPL RTA F3X (rear toe arm) and SPL RUA F3X (rear upper arm) for this purpose

Frequently Asked Questions

Why do the stock BMW eccentric bolts slip, and how does the SPL lockout kit fix it? The stock eccentric bolts on F2X and F3X rear suspension use friction to hold position once torqued to spec. Under sustained high cornering loads, that friction can be overcome and the bolt rotates slightly, shifting toe or camber away from the set position. The SPL lockout kit replaces the eccentric with CNC-machined aluminum lockout plates and grade 10.9 bolts with lock nuts, which mechanically prevent the arm position from changing regardless of the cornering load applied.
Do I need adjustable control arms to use the SPL eccentric lockout kit? Yes, and this is a hard requirement. Removing the eccentric bolts eliminates the factory rear toe and camber adjustment mechanism entirely. Without adjustable control arms, there is no way to set or change rear toe and camber after installation. SPL Parts specifies the SPL RTA F3X for rear toe adjustment and the SPL RUA F3X for rear camber adjustment; both are sold separately and should be installed alongside or before this lockout kit.
Does this kit cover both rear toe and camber arm positions? Yes. The SPL EL F3X eccentric lockout kit includes lockout plates, bolts, lock nuts, and washers for both the rear toe arms and the rear camber arms, making it a complete rear eccentric lockout solution for one car in a single purchase.
Can this kit be used on a street car or is it track-only? The kit is compatible with street cars that run a performance alignment using adjustable rear control arms. It is particularly well-suited for cars that divide time between road and track, where alignment consistency across sessions matters. On a completely stock street car with no adjustable arms and no intention of tracking the car, the factory eccentric bolts are typically sufficient and this kit would remove the ability to align the car through the standard method.
What vehicles does the SPL EL F3X fit? This kit fits 2010-2019 F22 and F23 (2 Series), and 2011-2019 F30, F31, F32, F33, F34, F35, and F36 (3 and 4 Series).

About SPL Parts

SPL Parts is a USA-based manufacturer of high-performance suspension components engineered for both professional racing and demanding street applications. Built on the core principles of strength, lightweight construction, low friction, and precision, SPL Parts products deliver the adjustability and alignment performance required by top race teams and discerning enthusiasts alike. Every component is produced using USA-sourced, certified materials and machined by experienced local shops to exacting tolerances. Professional TIG welders ensure maximum weld integrity, while each part is hand-fitted and treated with anti-seize and 3M internal panel coating for lasting protection. SPL Parts conducts all research and development in-house, allowing the team to leverage firsthand product knowledge and deliver unmatched customer support. Their suspension components feature innovative adjuster designs for quicker, more precise alignments, and utilize spherical bearings with Teflon liners that are self-cleaning, self-lubricating, and built for long service life. From concept to assembly, SPL Parts is made with pride in the USA by skilled machinists and welders who are committed to quality, innovation, and performance.

Additional Information

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Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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