Bolts and nuts with small 12 pt heads are sometimes used in high performance applications where limited clearance prohibits use of the larger 6 pt heads. They aren't splined, but are specifically des
2000cc Fords used internal spline screws to hold the cylinder head and timing belt tensioner on. Air cooled VWs used internal spline screws on the CV joints. There are male spline fasteners, but I'v
Haven't heard that one. Where does it come from? How "true" that is depends upon to which group of semantics you subscribe. In the inch system, machinists often refer to bolts small enough to be call
I'm not sure where it originates from, I looked it up quickly and found a reference in Rothbart's Mechanical Degign Handbook, (highly recommended) 11.2.2 Standards for Mechanical Elements, Bolts and