Threads and bolted joints
Thread geometry, clearance holes, preload, torque, stress, and proof load.
Choose the thread and hole, establish preload and torque, then verify stress and proof load.
Calculators in this category
Metric Thread
Calculate ISO metric thread dimensions and limits.
Open calculator →Thread Tensile Stress Area
Calculate the nominal tensile stress area of an ISO metric thread.
Open calculator →Clearance Hole
Look up ISO 273 clearance-hole diameters.
Open calculator →Tightening Torque
Relate preload, friction, and tightening torque.
Open calculator →Bolt Preload
Calculate preload from torque and friction.
Open calculator →Bolt Stress
Assess combined tensile and torsional bolt stress.
Open calculator →Proof Load
Determine proof load from property class and stress area.
Open calculator →Single-bolt Joint Assessment (VDI 2230)
Split external load between bolt and clamped parts and check separation, slip, proof and fatigue.
Open calculator →Power Screw Torque, Efficiency and Self-Locking
Calculate the torque a lead screw needs to raise and lower its load, its efficiency and whether it is self-locking, with the lead angle, a reference friction angle by nut material, the thrust-face share and the drive power.
Open calculator →Hex Bolt Dimensions (ISO 4014)
Look up head, key and thread-length dimensions of a partial-thread hex bolt to ISO 4014 for a nominal size and length.
Open calculator →Full-Thread Hex Bolt Dimensions (ISO 4017)
Look up head, key and incomplete-thread run-out dimensions of a full-thread hex bolt to ISO 4017 for a nominal size and length.
Open calculator →Socket Head Cap Screw Dimensions (ISO 4762)
Look up head diameter, head height and hexagon socket size of a socket head cap screw to ISO 4762 for a nominal size.
Open calculator →Friction Coefficient from Torque Test (ISO 16047)
Determine the total, thread, and bearing friction coefficient of a bolted joint from measured torque-tension test data to ISO 16047.
Open calculator →Required Thread Engagement Length (VDI 2230)
Determine whether a tapped joint's internal or bolt thread would strip first and the minimum engagement length to make the bolt fracture first, per VDI 2230-1 clause 5.5.5.
Open calculator →Plain Washer Dimensions (ISO 7089)
Look up hole diameter, outer diameter and thickness of a plain washer to ISO 7089, normal series, product class A.
Open calculator →Nut Proof Load (ISO 898-2)
Look up the tensile proof load a coarse-thread nut of a given size and strength class must withstand to ISO 898-2.
Open calculator →Bolt Circle Hole Spacing Calculator
Calculate the straight-line distance between two adjacent, evenly spaced holes on a bolt circle.
Open calculator →Power Screw Nut Length Calculator
Calculate the required nut length of a power screw from screw load, pitch, pitch diameter, bearing depth and allowable flank pressure.
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