Margo wrote:
Ann, here is Dr. Bob's description of a topstitch needle's atributes:
http://www.superiorthreads.com/shop/category/home-machines/description/
The difference between a sharp needle and a universal needle is that a sharp one has a more pointed tip to pierce through the woven threads of the fabric. A universal needle is not quite as sharp and will sometimes pierce the threads, and sometimes not. A ball point needle is almost rounded and designed to slip between the woven threads and was developed to sew on knit fabrics and not split the threads. A line of stitching can sometimes look almost like a slightly zig-zag line.
For quilting, I always use a sharp (usually topstitch) needle in order to get as straight a stitching line as possible.
You're right, Margo. The other thing is that a sharp is a type of needle, not just a description. It's almost the same as microtex and jeans needles. I think the differences between the three have to do with the proportion of each needle as it slopes to form the tip. (Don't quote me.)
Ann, a topstitch needle also has a sharp point, just like the sharp, the microtex, and the jeans needles. But it has a deeper groove for the thread to lay in, and a larger eye, so it handles persnickety threads such as metallics and rayons better. Because they undergo less friction in this type of needle, they're less likely to fray.
Not all topstitch needles are titanium. The ones Dr. Bob is talking about are.