BMW Socket Sets & Wrenches

When I first started working on my E46, I figured my existing 1/2 Craftsman set would cover everything. Within one oil change I'd already encountered my first triple square bolt and had nothing to fit it. Now I maintain a dedicated BMW socket kit that lives on a labeled tray in my shop.

The three non-standard fastener types you'll encounter on virtually every BMW are E-Torx (external Torx), triple square (XZN), and Torx (internal). E-Torx runs from E6 through E24 and appears on driveshaft CV joints, some suspension bolts, and engine components. Triple square covers M5 through M12 typically and handles axle bolts (usually XZN14 or XZN16), engine mount hardware, and subframe bolts. Get a set of each before touching suspension or drivetrain work.

For hex sockets, 13mm, 17mm, and 19mm are the BMW most-used sizes. Wheel lug bolts are 17mm across nearly all models. Oil drain plugs are typically 17mm on the N52, N54, N55, and B58. Caliper slide pin bolts on rear calipers are often 13mm. Brake caliper carrier bolts are usually 17mm or 19mm depending on the platform.

The 22mm deep socket gets used for the oil filter housing on the N52 and N54 - you'll do that job dozens of times. A 36mm socket handles the front axle nut on E46 and E9x platforms. Always use a proper hex socket, not a 12-point, on these large fasteners - they're often rusty and a 12-point will round them.

I run a 3/8 drive set as my primary on BMW work. The 1/2 drive is overkill for most jobs and the larger head size gets in the way in tight engine bays. Reserve 1/2 drive for axle nuts, lug bolts with an impact, and any torque application over 80 Nm.

The 1/4 drive set earns its place specifically for spark plugs on the N52 and N54. The plug gap on the N54's coil-over-plug design means a full 3/8 spark plug socket won't seat properly in some cylinders without a U-joint that introduces alignment problems. A 1/4 drive thin-wall spark plug socket gets in and out cleanly. Also useful for small sensor bolts, interior fasteners, and valve cover hardware.

For specialty applications like VANOS bolt removal or crankshaft holding tools, check the specific tool requirement before buying - these are usually 1/2 drive due to the torque involved. Having a breaker bar for your 1/2 drive is worth more than a ratchet when breaking loose the harmonic balancer bolt (which is 27mm on most models and torqued to 390+ Nm).

Brand-wise, I use Tekton for impact sockets and Gearwrench for hand ratchet sets. The E-Torx and triple square sets from Ares or Astro Tools are solid for the price. Snap-On and Matco are great if budget allows, but the mid-range options hold up fine for a home garage doing 20-40 jobs per year.