Fastener tools and charts.
The numbers we use in our own shop: a torque and preload calculator, and dimension charts for hex and heavy hex bolts, nuts and wrench sizes, taken from the ASME and ISO standards. Free, no sign-up.
Bolt torque calculator
Preload and tightening torque from size, grade, nut factor K and target % of yield or proof load, inch and metric.
Bolt size chart
Hex and heavy hex bolt and cap screw head dimensions: across flats, across corners, head height. ASME B18.2.1 and ISO 4014.
Heavy hex nut chart
Heavy hex, hex and jam nut dimensions: width across flats and corners, thickness. ASME B18.2.2 and ISO 4032.
Wrench size chart
The wrench or socket for every hex and heavy hex bolt and nut, 1/4 to 4 in. and M5 to M64, inch and DIN/ISO.
Dimensions from ASME B18.2.1-2012 and ASME B18.2.2-2015 as printed in the IFI Book of Fastener Standards (2018) and cross-checked against the IFI Technology Connection; metric from ISO 4014:2011, ISO 4032:2012, DIN 931 and DIN 934. Strengths come from the grade pages in our materials library.