Free Fastener Calculators

A collection of free online calculators for fastener engineers, QC teams and buyers. No registration required — just open and use.

Thread Limit Dimensions

Calculate the maximum and minimum permissible thread dimensions (major, pitch, minor diameter) per ISO 965-1 and ASME B1.1.

Convert between Rockwell, Brinell, Vickers, Knoop and tensile strength — 8 material types, ISO 18265-2004 / ASTM E140.

Look up clearance hole diameters for metric (ISO 273) and imperial (ASME B18.2.8) bolts — close, normal and loose fit.

Calculate the required tightening torque for bolts and screws to achieve the correct clamping force.

Calculate the weight of 1000 fastener pieces based on type, size and material. Essential for purchasing and shipping estimation.

Calculate the minimum breaking torque for metric bolts per ISO 898-7 — used for incoming QC inspection and fastener qualification.

Calculate the tensile stress area (As) for metric and unified inch threads per ISO 898 / ASME B1.1.

Calculate theoretical steel weight by shape (bar, sheet, pipe, angle, etc.) and material density — 12 materials, 7 shapes.

Calculate the wire blank diameter for cold-headed fasteners based on volume conservation. Essential for manufacturing planning.

Cross-reference and convert between metric (ISO), unified inch (UNC/UNF), and British (BSW/BSF) thread standards.

Look up countersink and counterbore dimensions for metric (ISO) and imperial (ASME) fasteners — through-hole, CSK and CBore sizes.