Wheel bearing won't have any threads. If your talking about the post they mount on, then you can use a pitch gage to get the number of threads per inch and then compare that to a thread chart to determine if they are coarse or fine.
300 to 400 depending on the type of cotton and whether or not the pillows were fabricated in Malaysia or Portugal. The thread count may be higher if the pillow is more expensive.
The first technician is correct, it is a coarse thread. I'm not sure there is a bolt called 12-13 so I am assuming you meant 1/2 - 13. Wich would be a bolt 1/2 inches long. The diameter of a #13 unc bolt would be ( 13 x .013in ) + .06 = .229 inches in diameter.
normal thread is used, the thread used in Tailor work. It is just the way they use it, it seems magic.
Take the knob with you to a hardware store, and find a metric bolt that will screw into the knob. This would be the easiest way.
You thread a needle with the thread you want to pull through, pass the needle into the material slightly within the margins of the pattern and pull the thread through. You don't really have to pull the top thread through to tie off because the stitch density is high enough to lock the thread, you can clip close. If you feel the need, unpick a few stitches (don't rip them, unravel the top and bobbin threads) until you have enough length to work with, pull the top thread through the fabric with the bobbin thread ad tie them together. When you change top thread, lay a short tail of the previous color and the new thread across the next pattern section and the thread will be locked. Same idea when you change the bobbin thread
wheel bearings are not threaded, the beaing races are smooth as is the axle and hub where the bearings fit
Coarse tacking thread.
It's thread which is thicker or heavier than others, or which has a rougher or more fibrous surface.
Is made of coarse tacking thread.
To determine the size of a thread, you can use a thread gauge tool or a caliper to measure the diameter of the thread. The size is typically expressed in terms of the thread's pitch and diameter, which can help you identify the thread size.
Pocket holes typically require 1 1/4-inch coarse-thread screws for softwoods and 2 1/2-inch coarse-thread screws for hardwoods.
UNC stands for "UNIFIED BOLT THREAD COARSE" UNF stands for " UNIFIED BOLT THREAD FINE"
No. The coarse thread UNC screws will not thread into the fine thread UNF holes. UNC must be used with UNC and UNF with UNF.
University of North Carolina Unified National Coarse (Thread forming)
Coarse thread drywall screws have deeper and more widely spaced threads, providing better grip and holding power in softer materials like wood. Fine thread drywall screws have shallower and closer together threads, making them better suited for harder materials like metal studs.
It's used to make burlap cloth, which is a coarse sacking material.
He is right. A fine thread would be 1/2-20.