[iPhone God App] It was found using the Mech Tool actually

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.

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