HELICOIL 1191-4CNX.375 INSERT 1/4-28 X 1.5D-PACK OF 100

HeliCoil Inserts or Wire Thread Inserts are made of cold rolled 18-8 grade stainless steel. This wire is cold rolled to a diamond cross section producing an ultimate tensile strength. mirror like surface finish of 2-4 Microns and flank hardness of RC 43-50 which is far in excess of the usual tapped materials and best suited for most of the industrial needs.