The numbers you need at the bench.
Bolt torque and tap drill sizes for metric and inch threads, calculated from the published standards, with the working shown on every page.
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26 bolt sizesMetric M4–M36 and inch 1/4"–1", each in three strength grades
80 threadsTap drill, decimal, metric equivalent and thread percentage
4 standardsEvery value calculated from ISO and SAE inputs, never copied
Bolt torque
Pick a size for dry and lubricated torque, clamp load, wrench and tap drill.
Tap drills
Hole sizes drawn to scale, like a drill index. Each page shows the thread the drill leaves.
Calculated, not copied
Most torque charts online are copies of copies. Every number here is computed from the standard's own inputs, and each page shows the sum.
ISO 898-1Proof stress for metric property classes 8.8, 10.9 and 12.9
SAE J429Proof strength for inch grades 2, 5 and 8
ASME B1.1Unified thread series and tensile stress area for inch bolts
ISO 273Clearance hole sizes, close, normal and loose fit