You're right, of course. What was I thinking! Obviously not the rigth answer, which I knew. My needle must have jumped a groove.
The remainder is new to me, however. For both parts of that, the correction and the addition to my knowledge, many thanks! Jim On Wednesday 2004 January 28 18:29, Chimpsarecute wrote: > > I wonder if the "C5" refers to a set or class of tolerances, then. The > > "4.8" > > > would refer to the diameter and thread spacing as normal for metric > > fasteners. > > > > Jim > > No, the 4.8 refers to a fastener's property class, which in FFU screws > would be the grade. Each metric Class symbol consists of two numbers > separated by a period. The first number is 1/100 of the nominal tensile > strength in N/mm2 (newtons per square millimeter. The second number is 10 > times the ratio of nominal yield stress to nominal tensile strength. For > example, a Class 4.8 bolt has a nominal tensile strength of 400 N/mm2 and a > nominal yield stress of 320 N/mm2 (8 times 400 divided by 10). .... -- James R. Frysinger Lifetime Certified Advanced Metrication Specialist Senior Member, IEEE http://www.cofc.edu/~frysingj [EMAIL PROTECTED] [EMAIL PROTECTED] Office: Physics Lab Manager, Lecturer Dept. of Physics and Astronomy University/College of Charleston 66 George Street Charleston, SC 29424 843.953.7644 (phone) 843.953.4824 (FAX) Home: 10 Captiva Row Charleston, SC 29407 843.225.0805
