Fasteners Calculators
Engineer bolted, pinned and welded joints: bolt preload from tightening torque (T = K·d·F), bolt shear and bearing stress, clevis-pin checks, shear-pin diameter, eccentric bolt-pattern shear, bolt-circle coordinates, weld throat, fillet-weld and weld-group sizing, heat input, weld deposition, plus three-wire thread pitch-diameter.
Bolt Preload & Torque
Clamp force (preload) from tightening torque and the nut factor.
Bolt Circle Coordinate
X-Y hole coordinates and spacing on a bolt circle, with a layout render.
Fillet Weld Size
Effective throat and weld capacity from leg size, length and electrode (AWS/AISC).
Weld Throat
Fillet weld throat, throat area, capacity and required equal leg from equal/unequal legs, root opening and ASD/LRFD basis.
Welding Heat Input
Arc welding heat input in kJ/mm and kJ/in from voltage, current, travel speed and efficiency.
Welding Deposition
Fillet weld deposited metal, filler mass and arc time from weld length, leg size, density and deposition rate.
Bolt Shear Strength
Ultimate shear capacity of a bolt from grade, diameter and pitch — thread or shank plane, single or double shear.
Shear Pin Diameter
Required round pin diameter from shear force, allowable stress, safety factor and shear planes.
Bolt Pattern Force
Shear load per bolt in a circular pattern under a torsional moment plus direct shear.
Thread Pitch Diameter
Pitch (effective) diameter of a 60° thread by the three-wire method, plus the best wire size.
Thread Engagement
Check engaged thread length against internal and external thread stripping for metric, UNC and UNF threads.
Torque to Tension
Convert tightening torque to bolt tension, or target preload to required torque, with nut factor K.
Bolt Elongation
Elastic bolt stretch, stress and strain from preload, stressed length, area and modulus.
Bolt Bearing Stress
Average bolt or pin bearing stress from projected area d*t, load per fastener and allowable stress.
Clevis Pin
Clevis pin shear, bending, eye bearing, fork bearing and utilization from load and lug geometry.
Weld Group
Rectangular weld-group stress and required fillet leg under eccentric in-plane loading.
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This cluster sizes the joints that hold machines together: bolted, pinned and welded. Tightening torque is converted to clamp load through the short-form nut-factor relation T = K·d·F, so the bolt preload and torque calculator tells you the actual preload a wrench produces rather than a generic spec — and the bolt torque spec chart backs it up by grade and diameter. For strength checks, the bolt shear strength calculator takes the grade's tensile strength to a shear capacity V = n·A·0.6·Su, picking the tensile-stress area in the threads or the shank area in the body, single or double plane. The bolt bearing stress calculator checks the plate side of the joint with sigma_b = F_bolt/(d·t), while the clevis pin calculator combines pin shear, simplified pin bending, eye bearing and fork bearing.
For groups and welds, an eccentric bolt-pattern tool resolves a torsional moment plus direct shear into the load on the worst bolt. The weld throat calculator handles equal and unequal fillet legs, root-opening allowance and ASD/LRFD throat capacity, while the fillet weld size calculator gives the faster equal-leg 0.707-leg workflow. The weld group calculator extends that to rectangular eccentric weld groups using q = F/L plus M·r/J. The welding heat input calculator keeps procedure variables visible by converting voltage, current, travel speed and efficiency into kJ/mm and kJ/in before a WPS comparison. The welding deposition calculator estimates fillet weld volume, deposited metal, filler required and arc time from weld length, leg size, deposition rate and efficiency. A three-wire thread pitch-diameter tool rounds out inspection.
It is built for machinists, fabricators and design engineers who want the governing formula and standard on screen, in metric or imperial — not a black box behind a parts quote.