SUCOSO 10-Spline Lug Nut Key for Bimecc – Chrome Alloy 3.5" Socket, 19/21mm Hex Drive

The SUCOSO 10 spline lug nut key is a single-piece, chrome-coated alloy socket designed to remove and install Bimecc 10-spline lug nuts and compatible spline bolts safely and accurately.

This heavy-duty socket key replaces part TA20-19/21 and fits a wide range of 10-spline Bimecc hardware. Built from alloy steel and finished with chrome plating, the key measures 3.5" (90 mm) long with a hex drive available in 3/4" (19 mm) and 13/16" (21 mm). It is engineered for hand-wrench use on specific thread sizes and spline patterns so you can service wheels and fasteners without damaging the nut heads.

Which Bimecc lug nuts and bolts will this key fit?

This key is intended for 10-spline Bimecc lug nuts and selected 10-spline lug bolts. Confirm both spline and thread dimensions before use to ensure a secure fit and correct engagement with the fastener.

• Compatible lug nut threads: M12x1.5, M12x1.25, 1/2UNF, 7/16UNF
• Compatible lug bolt threads: M12x1.5, M12x1.25, M14x1.5, M14x1.25
• Direct replacement part numbers: TN20A22OP, TN20A43, TB20A24, TB20A26, TB20A28, TB20D26, TB20D28, TB20D30

How is this key built and how durable is it?

The socket key is forged from high-strength alloy steel and finished in a chrome coating to resist wear and corrosion. Cold-forging increases material toughness, while a prolonged salt-spray test validates improved corrosion resistance compared with untreated parts.

• Material: high-strength alloy steel
• Finish: chrome coating for corrosion resistance and easy cleaning
• Manufacturing: cold-forged for enhanced hardness and longevity

What are the exact dimensions and how should I use it?

Dimensions are critical for proper engagement and safe operation. This SUCOSO key is 90 mm (3.5") long and offers two hex drive sizes to match common hand tools. For safety and to avoid damage, operate with a hand wrench and never use an impact wrench.

• Overall length: 3.5" (90 mm)
• Hex drive options: 3/4" (19 mm) and 13/16" (21 mm)
• Quantity: sold as a single piece, color: silver/chrome
• Use only with a hand wrench; avoid power impact tools

What should I check before buying and during installation?

Confirm spline count, thread pitch and outer diameter of your lug nuts/bolts to ensure compatibility. Inspect the tool and fastener surfaces for damage, and follow proper torque specifications from your vehicle or wheel manufacturer when reinstalling hardware.

• Verify 10-spline pattern and correct thread pitch before purchase
• Check nut/bolt condition—replace if rounded or damaged
• Follow vehicle wheel torque specs when tightening

Who is this for: This SUCOSO lug nut key is aimed at mechanics, wheel shops, and vehicle owners who service Bimecc wheels or who need a reliable replacement for TA20-19/21 style 10-spline fasteners. It is ideal for anyone seeking a durable, hand-wrench-compatible tool to remove or install 10-spline lug nuts and bolts while minimizing the risk of tool or fastener damage. For questions or concerns after purchase, SUCOSO provides customer support to help with fitment and troubleshooting.