UNC, 1.1/4" x 2.1/2", Socket Screw, Cap Head, High Tensile/ 12.9, Self Colour, ISO 4762, DIN 912, BS 2470 – Fixaball Ltd. Fixings and Fasteners UK
UN imperial screw thread calculator
Unified Thread Standard
Thread Chart (UNF-UNC) | Major and Minor Diameters
Everything you wanted to know about taps but were afraid to ask, styles of taps, class of thread , gh numbers , basic point in thread measurement , constants for finding pitch
Fastenerdata - UNC Unified America Threads - Fastener Specifications
UNF 1/4" 28G thread | Determination – Thread Types | Screw Joints | Technical information | BOLA - Tubing, Stirrer Shafts, Magnetic Stirring Bars - Labware made of PTFE