Bearings 8
- Bearing Defect Frequency CalculatorCalculatorBPFO, BPFI, BSF and FTF derived from the bearing's own rolling kinematics, in hertz and in…
- Bearing Duty Cycle and Cubic Mean Load CalculatorCalculatorThe cubic mean load for a varying duty cycle, with each segment's share of the DAMAGE…
- Bearing Equivalent Load CalculatorCalculatorP = X·F_r + Y·F_a, with the limit e that X and Y switch at —…
- Bearing Fits and Shaft Tolerance CalculatorCalculatorThe ring with the rotating load gets the interference fit — then the actual interference range…
- Bearing Life L10 CalculatorCalculatorL10 = (C/P)^p in millions of revolutions and in hours, with p = 3 for ball…
- Bearing Preload and Axial Play CalculatorCalculatorResidual radial clearance after mounting: the clearance class, less what the interference fit eats, less what…
- Bearing Relubrication Interval and Grease Quantity CalculatorCalculatorThe grease interval from the published closed form, halved for every 15 °C above 70, with…
- Plain Bearing PV Limit CalculatorCalculatorPV = p·v on the PROJECTED area for a dry or boundary-lubricated bush, with sourced PV,…
Bolted Joints & Torque 7
- Bolt Fatigue Under Alternating Load CalculatorCalculatorThe alternating stress a preloaded bolt actually sees — Φ times the external load range, not…
- Bolt Group Shear CalculatorCalculatorA rectangular bolt group carrying an in-plane load with an eccentricity, by the elastic method —…
- Bolt Proof Load and Tensile Stress Area CalculatorCalculatorThe tensile stress area computed from ISO 898-1's own definition — the circle on the mean…
- Bolt Torque CalculatorCalculatorT = K·F·d, with the nut factor computed from friction rather than looked up, the torque…
- Bolted Joint Stiffness and Separation CalculatorCalculatorBolt stiffness with the shank and thread in series, member stiffness from the Rotscher cone at…
- Preload Accuracy by Tightening Method CalculatorCalculatorWhat each tightening method actually guarantees from the same bolt. VDI 2230's tightening factors turned into…
- Thread Engagement Length CalculatorCalculatorHow deep the tapped hole has to be so that the bolt breaks before the thread…
Chain, Belt & Sprocket Drives 6
- Belt Tension and Shaft Load CalculatorCalculatorHow tight, measured the way you can actually measure it — deflect the span by a…
- Chain Length and Center Distance CalculatorCalculatorChain length from a centre distance and centre distance from a chain length, with the even…
- Chain Wear and Elongation CalculatorCalculatorMeasure a length across a known number of pitches and this returns the elongation, the remaining…
- Drive Service Factor CalculatorCalculatorThe service factor and the design power, from three published families at once — the chain…
- Roller Chain Selection CalculatorCalculatorWhich chain size, from the power and the speed — by the route that can be…
- Sprocket Geometry CalculatorCalculatorEvery diameter a sprocket drawing needs, from the tooth count, the pitch and the roller —…
Fastener Dimensions 11
- Counterbore and Countersink CalculatorCalculatorCounterbore diameter and depth for a socket head, countersink top diameter and depth for a flat…
- Dowel Pin and Hole CalculatorCalculatorThe actual interference or clearance range from the pin's band and the hole's, with the contact…
- Hex Head Bolt Dimensions CalculatorCalculatorAcross flats, across corners, head height, washer face, thread length and the plain shank left under…
- Hex Nut Dimensions CalculatorCalculatorAcross flats, across corners, thickness and bearing-face diameter for ISO 4032 style 1, ISO 4033 style…
- Metric to Imperial Fastener Cross-Reference CalculatorCalculatorThe closest thread in the other system, with the diameter and the pitch differences both printed…
- Retaining Ring Groove CalculatorCalculatorGroove diameter, width, depth and the ring's radial cling for DIN 471 external and DIN 472…
- Set Screw Dimensions CalculatorCalculatorPoint dimensions for all four ISO socket set screws — cup (4029), cone (4027), flat (4026)…
- Shoulder Screw CalculatorCalculatorEvery ASME B18.3 dimension for all fourteen hex socket head shoulder screw sizes, in inches and…
- Socket Head Cap Screw Dimensions CalculatorCalculatorEvery ISO 4762 / DIN 912 dimension, with the head height made the headline because it…
- Torx and Drive Size CalculatorCalculatorTorx, Phillips, Pozidriv, slotted and square side by side — with the ISO socket dimension and…
- Washer Dimensions CalculatorCalculatorBore, rim, thickness and — the number that actually decides the choice — the bearing area…
Fits, Tolerances & GD&T 7
- GO / NO-GO Gauge Tolerance CalculatorCalculatorPlug and ring gauge sizes from the feature's own tolerance — GO at the maximum material…
- ISO 2768 General Tolerance CalculatorCalculatorEvery general tolerance ISO 2768 gives for the letters in your title block — linear, angular,…
- ISO 286 Fit CalculatorCalculatorHole limits, shaft limits and the real clearance or interference range for any ISO 286 pair…
- IT Grade Tolerance CalculatorCalculatorThe ISO 286 standard tolerance for any grade from IT01 to IT18 at any size from…
- Thermal Effect on Fit CalculatorCalculatorWhat an ISO 286 fit specified at 20 °C actually becomes at operating temperature, from the…
- Tolerance Stack-Up CalculatorCalculatorWorst-case and RSS assembly tolerance for a chain of up to six contributors, with the mean-shift…
- True Position and MMC Bonus CalculatorCalculatorTrue position from an X and Y deviation — doubled, because a position tolerance is a…
Gears & Gear Trains 11
- Bevel Gear Geometry CalculatorCalculatorPitch cone angles for any shaft angle, outer and mean cone distances, the face width limit…
- Gear Contact Ratio and Backlash CalculatorCalculatorTransverse contact ratio from the tip and base circles and the line of action, banded against…
- Gear Module and Diametral Pitch CalculatorCalculatorModule, diametral pitch and circular pitch converted exactly in any direction, with the ISO 54 module…
- Gear Profile Shift CalculatorCalculatorThe operating pressure angle, the centre distance modification coefficient and the tip shortening coefficient computed side…
- Gear Ratio, Speed and Torque CalculatorCalculatorTwo to four gears, in a line or in pairs — with the idler shown to…
- Gear Tooth Bending Stress CalculatorCalculatorThe Lewis bending estimate with the Barth velocity factor, both published readings of the form factor,…
- Helical Gear Geometry and Thrust CalculatorCalculatorNormal against transverse module and pressure angle, centre distance, the axial thrust F_t·tan β that goes into…
- Planetary Gear Train CalculatorCalculatorAll six configurations of a planetary set, solved from the Willis equation — with every ratio…
- Rack and Pinion CalculatorCalculatorTravel per revolution, steps per millimetre, thrust and backlash for a rack and pinion drive —…
- Spur Gear Geometry CalculatorCalculatorEvery dimension a spur gear drawing needs — pitch, tip, root and base diameters, centre distance,…
- Worm Gear Ratio and Efficiency CalculatorCalculatorRatio, lead angle, sliding velocity and efficiency for a worm pair — with the heat that…
Shafts, Keys & Couplings 8
- Coupling Torque and Selection CalculatorCalculatorSelection torque for a flexible coupling from power, speed and a published service factor — then…
- Interference Fit and Shrink Fit CalculatorCalculatorA hollow hub on a solid or hollow shaft in two different materials, by the Lamé…
- Parallel Key and Keyway Dimensions CalculatorCalculatorKey width, height and both keyway depths to DIN 6885-1 and ISO 773 from the shaft…
- Shaft Critical Speed CalculatorCalculatorFirst bending critical speed of a shaft, bracketed between Dunkerley's lower bound and Rayleigh's upper one,…
- Shaft Deflection and Slope CalculatorCalculatorDeflection AND the slope at the bearing, for the standard shaft load cases, checked against the…
- Shaft Fillet and Stress Concentration CalculatorCalculatorKt for the three stress raisers that matter on a shaft — a shoulder fillet, a…
- Shaft Power, Torque and Speed CalculatorCalculatorP = T·ω in both unit systems through the exact constants — and then the shaft…
- Spline Torque Capacity CalculatorCalculatorTorque capacity of an involute or straight-sided spline against all three published limits — tooth shear,…
Springs 7
- Belleville Washer Load Deflection CalculatorCalculatorThe Almen–László load–deflection curve, with h₀/t naming the regime — linear, degressive, flat at √2, or…
- Compression Spring Buckling CalculatorCalculatorThe deflection at which a compression spring goes unstable, from the published stability criterion, with all…
- Compression Spring Rate and Solid Height CalculatorCalculatork = Gd⁴/(8D³n_a) with D the MEAN coil diameter, the four end types driving the active…
- Extension Spring Rate and Initial Tension CalculatorCalculatorF = P_i + k·x, with the initial tension checked against the band that can actually…
- Spring Index and Wahl Factor CalculatorCalculatorBoth published stress correction factors — Wahl and Bergsträsser — with the correction split into the…
- Spring Wire Material and Allowable Stress CalculatorCalculatorS_ut = A/d^m computed for seven spring wires, with the allowable stress for the material, the…
- Torsion Spring Rate and Deflection CalculatorCalculatork = Ed⁴/(10.8·D·n) — E, because the wire is in bending — printed per turn, per…
Strength, Fatigue & Materials 6
- Fatigue Endurance Limit and S-N Curve CalculatorCalculatorS_e′ = 0.5·S_ut capped at 700 for steel, all five Marin factors, the S-N line read…
- Hertzian Contact Stress CalculatorCalculatorContact pressure, patch size and approach for spheres, cylinders and crossed cylinders — with a concave…
- Impact and Shock Load Factor CalculatorCalculatorThe impact factor from energy — exactly 2 for a suddenly applied load, 1 + √(1…
- Mohr’s Circle and Principal Stress CalculatorCalculatorPrincipal stresses, the principal angle and BOTH maximum shears — in-plane and absolute — from a…
- Thermal Stress CalculatorCalculatorσ = E·α·ΔT derived rather than quoted — and the fact that it does not depend…
- von Mises and Failure Criteria CalculatorInterpretervon Mises and Tresca side by side for a ductile material, maximum normal stress and Coulomb–Mohr…
Stress in Machine Parts 5
- Beam Stress and Deflection CalculatorCalculatorEight load cases with the section property computed rather than tabulated, the deflection checked against a…
- Combined Bending and Axial Stress CalculatorCalculatorσ = P/A ± M·c/I with both extreme fibres reported, so you can see whether the…
- Curved Beam Stress CalculatorCalculatorWinkler's theory for hooks, C-frames and chain links: the neutral axis shifted off the centroid, the…
- Section Properties CalculatorCalculatorArea, both second moments, both section moduli, the centroid and the radii of gyration for eight…
- Torsion of Non-Circular Sections CalculatorCalculatorα and β for a solid rectangle, Bredt–Batho for a closed thin wall, ⅓Σbt³ for an…
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