Titanium bolts M12×28 30 32 38 43mm Conical Seat Torx Lug Bolt Sets for BMW cars, Pitch 1.5mm, by Tianswer

Hot-forged aerospace Grade 5 Ti-6Al-4V titanium M12 × 1.5mm 60° conical seat wheel lug bolts featuring internal high-torque Torx T70 drive heads, engineered for classic BMW (E-chassis E30, E36, E46, Z3, Z4), Lotus, Renault, and aftermarket performance tuner wheels.

Sold in sets of 5 (1 wheel / spare), 10 (front or rear axle / 2 wheels), and 20 (full car / 4 wheels). Select your color, shank length, and package size.

Package Options & Vehicle Axle Configurations

European vehicles feature standard 4-lug or 5-lug hub patterns. To match your maintenance or tuning setup, choose from three tailored package quantities:

• Set of 5 (1 Wheel / Spare): Complete hardware set for one wheel. Perfect for single wheel replacement, spare tire mounting, or test-fitting custom spacer offsets.
• Set of 10 (Front or Rear Axle / 2 Wheels): Contains 10 lug bolts to outfit one complete axle. Ideal when upgrading front or rear brake kits, or when running staggered wheel spacer widths.
• Set of 20 (Full Car / 4 Wheels): Complete 20-piece vehicle set to replace all factory wheel bolts across all four corners for maximum rotating unsprung mass reduction.

60° Conical Seat Geometry & Vehicle Fitment

Engineered with a precision 60-degree conical (tapered) seat to match OEM BMW and aftermarket forged wheels:

• M12×1.5mm Thread Fitment: BMW E-Chassis 3-Series (E30 M3, E36, E46), Z3, Z4 (E85), Lotus Elise/Exige, Renault Sport, and European tuner applications.
• Aftermarket Wheel Compatibility: BBS, APEX, Volk Racing, Enkei, HRE, OZ Racing, and Vorsteiner wheels utilizing 60° conical seats (Note: not for factory radius/ball-seat wheels).

Significant Unsprung & Rotating Mass Reduction

Weighing only 32g to 42g per bolt compared to 75g to 90g for factory steel lug bolts, a 20-piece vehicle set sheds approximately 1.0 kg (~2.2 lbs) of purely rotating unsprung mass directly at the wheel hubs. Removing mass at the rotating perimeter lowers wheel gyro inertia, delivering sharper steering feedback, snappier throttle acceleration, and superior suspension compliance over track curbing and rough road surfaces.

Torx T70 Internal Drive & Rim Protection

Unlike bulky 17mm or 19mm external hex sockets that frequently scratch narrow lug pocket walls on forged wheels, the sleek internal Torx T70 design keeps tool engagement entirely within the bolt head. The deep 6-lobe star pattern provides maximum contact surface area to eliminate cam-out, handles high track-day clamping loads without rounding, and acts as an effective built-in theft deterrent.

Specifications & Dimensions

Material: Hot-Forged Aerospace Ti-6Al-4V (TC4) Titanium Alloy, Grade 5
Tensile Strength: ≥ 950–1050 MPa (Surpasses Class 10.9 steel specs)
Thread Size & Pitch: M12 × 1.5mm Metric Coarse
Seat Type: Standard 60° Conical (Cone / Tapered) Seat
Head Diameter: 23.0mm
Head Height: 21.0mm
Drive Type: Internal Torx T70 Star Drive
Weight: Approx. 32g – 42g per bolt
Available Shank Lengths: 28mm, 30mm, 32mm, 38mm, 43mm (accommodates 3mm to 15mm wheel spacers)
Available Finishes: Natural Titanium, PVD Vacuum-Coated Gold, Rainbow, Burn Blue, PVD Deep Black

Installation & Torque Guidelines

Install with clean hub threads. Apply a very light film of high-temperature anti-seize paste on threads to prevent friction galling. Never use impact guns for final torque. Always start threads by hand, then torque in a star pattern across multiple progressive stages to 110–120 N·m (80–88 lb-ft) using a calibrated manual torque wrench. Re-check torque after the first 100 km (60 miles). For complete engineering data on rotational inertia, read our Titanium Wheel Bolts & Unsprung Weight Guide.