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A pocket reference for machinists, mechanics, and mechanical engineers, Mech Tool is a collection of convenient utilities for reference on the job or on the go.+ Screw threads reference for UNC, UNF, UNEF, UNM, Acme and Metric fasteners. Includes major diameters, thread pitch, tap drills, and hex head widths.+ Bolt grades shows codes on bolt heads with proof loads, tensile strengths, bolt hardness and material description for ASTM and ISO bolts.+ Roller chain for ANSI, BS/DIN, and Conveyor chains features chain pitch, width, working load, and tensile strengths of various chains.+ Drill sizes lists all number, letter, fractional, and metric drills from 0.00 to 1.00".+ Fractions list quickly converts fractions to decimal values in a scrolling list. Includes 64ths, 32nds, 16ths, 8ths etc.+ Sheet metal thickness and weight reference for aluminum, brass, steel, and steel wire in thicknesses from 8 gauge to 40 gauge.Please share your ideas for additional functions at our website.If you like Mech Tool please leave us good feedback on the iTunes store!