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Fastener Engineering Calculators
A bench-side suite of 15 calculators for metric fasteners. Inputs validate as you type; every result is computed from the published standards — ISO 261, ISO 273, ISO 4014 / 4017 / 4762, ISO 4032, ISO 7089 / 7093, ISO 898-1, ISO 3506 and ASME B1.1.
Bolt Length Calculator
Given the clamp thickness, washer and nut, returns the next standard bolt length plus thread engagement and projection.
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Thread Engagement Calculator
Minimum thread engagement length when threading a steel screw into a softer (or equal) parent material, based on the simplified ASME B1.1 / FED-STD-H28 approach.
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Tightening Torque Calculator
Indicative tightening torque for a metric bolt using T = K · F · d, with friction coefficient picked from common surface / lubrication conditions.
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Preload from Torque Calculator
Reverse calculation: given an applied torque, returns the resulting clamp force (preload) and its position relative to the bolt proof load.
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Bolt Shear Capacity Calculator
Ultimate shear capacity of a metric bolt in single or double shear, with selectable thread-plane or shank-plane shear and a safety factor.
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Tap Drill & Clearance Hole Calculator
Tap-drill diameter for cutting an internal thread (ISO coarse, 75 % engagement by default) and the matching ISO 273 clearance holes (close / medium / coarse).
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Thread Strip Strength Check
Checks whether the internal threads (in the parent material) will strip before the bolt breaks for a given engagement length. Critical for tapped blind holes in soft metals.
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Counterbore & Countersink Calculator
ISO 4762 counterbore for socket-head cap screws and ISO 7721 / DIN 74 countersink for 90° countersunk-head screws.
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Washer Size Selector
Standard ISO 7089 and ISO 7093 (large) flat washer dimensions for a given bolt size.
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Wrench / Socket Size Reference
Across-flats size of the hex bolt head and matching socket, the Allen key for ISO 4762 socket-head screws, the Torx size for ISO 14579, and the nearest SAE / imperial socket.
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Bolt Pattern (PCD) Calculator
For a given pitch circle diameter and number of bolts, returns the chord length between adjacent bolts and the X/Y coordinates of each hole.
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Helical Compression Spring Calculator
Spring rate, working force, solid length and corrected shear stress (Wahl factor) for a helical compression spring from its geometry and wire material.
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Property Class & Material Lookup
Reference table of proof strength, ultimate tensile and shear strength for every ISO 898-1 carbon-steel and ISO 3506 stainless-steel bolt grade.
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Pitch ↔ TPI Converter
Converts between metric pitch (mm) and imperial threads-per-inch, with a full reference table of the common ISO coarse pitches.
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Metric ↔ Imperial Converter
Bench-side unit converter for length, torque, force, pressure and mass — all the units that show up on a fastener data sheet.
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