Wrench & Socket Size Finder

Enter a bolt size to get the exact wrench or socket it needs, or enter a wrench size to see every bolt it fits — covers metric M3–M24 and SAE 1/4"–1". The interactive finder below does the lookup instantly; the reference table, minimum socket set, and FAQ underneath cover drive sizes, Allen/Torx call-outs, and the brand-specific exceptions (Toyota, Honda, GM, Ford) that trip up a generic size chart.

What size socket do I need for a 3/8" bolt?

A 3/8"-16 SAE bolt uses a 9/16" socket (14.29mm). The head size is 9/16" across flats. In metric, a 16mm socket is the next closest but is slightly too large — use 9/16" SAE for the best fit.

What wrench fits an M10 bolt?

An M10 metric bolt uses a 17mm wrench or socket (standard). Some Honda and Toyota M10 specialty bolts (banjo bolts, oil line fittings) use a 14mm hex head. Always verify the head size visually before applying force.

Can I use a 19mm socket instead of 3/4 inch?

19mm (0.748") and 3/4" (0.750") differ by only 0.002", making them practically interchangeable. A 19mm socket will fit most 3/4" bolt heads and vice versa. This is one of the closest metric-SAE socket pairs.

What socket size fits M8 bolts on Toyota vehicles?

Toyota M8 bolts typically use a 12mm hex head, not the standard 13mm. Using a 13mm socket on a Toyota M8 bolt will be loose and risk rounding the head. Always use 12mm for Toyota M8 fasteners.

What is the most common socket size for lug nuts?

The three most common lug nut socket sizes are: 21mm (Honda, Toyota, Subaru — M12x1.5), 19mm (Honda Civic, Accord, CR-V — M12x1.5 with 19mm hex), and 22mm (GM trucks, Ford trucks, European vehicles — M14x1.5 or M14x2.0). Always check your vehicle manual for the correct size.

What is the minimum socket set for automotive work?

A practical minimum set for 90% of automotive jobs includes: 10mm, 12mm, 13mm, 14mm, 17mm, 19mm (metric) and 9/16", 3/4" (SAE). Add 21mm and 22mm for lug nuts. These sizes cover oil changes, brake jobs, suspension work, and most engine accessory work on Japanese, American, and European vehicles.

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