Engineering Tools
Free online calculators for machinists, designers and buyers. Works on phone, installs as an app, runs offline.
Material Weight Calculator
Weight or length of round, hex, square and flat bar, sheet, pipe, tube, angle, channel, T bar and beam in MS, SS, brass, copper, aluminium, PTFE or any material.
Thread Finder
Pitch, TPI, tap drill and diameters for 3,100+ thread sizes across 73 standards: metric, UNC/UNF, BSP, NPT, trapezoidal and more.
Steel Pipe Schedule Chart
OD and wall thickness for NPS 1/8" to 48" in every schedule, 5S to XXS, in mm or inch. Tap a size for bore and weight per metre.
Install as an app
Add Micro Components Tools to your home screen for one-tap access, even offline.
Reference Charts
Tolerances and fits, hardness, surface finish and fasteners. Reference values only; verify against the current standard.
ISO Fits (Hole/Shaft) Reference
Common ISO hole-basis fit designations and their typical engineering use.
General Tolerance Chart (ISO 2768-1)
Permissible deviations for linear dimensions by tolerance class and size range.
Hardness Conversion Chart
Approximate equivalents between Rockwell C, Brinell, and Vickers hardness scales.
Surface Roughness (Ra) Chart
ISO roughness grade numbers with Ra values and typical machining processes.
Metric Clearance Hole Chart
Close-fit and free-fit clearance hole diameters for common metric bolt sizes.
Metric Bolt Head & Socket Sizes
Hex head across-flats and socket head hex key sizes for common metric bolts.
Metric Flat Washer Dimensions
Inside diameter, outside diameter, and thickness for standard metric flat washers.