8 Ps/set Precision Expanding Mandrel Set, 6978-0918 Not like traditional mandrels with fixed sizes, expanding mandrels are flexible and adjustable. With the tapered shafts and the elastic sleeves, one mandrel with a sleeve can hold a range of sizes. Thus, you don't need a great many of the mandrels with fixed dimensions. This precision and adjustable expanding mandrel set can support inside diameters ranging from 1/2" to 2". Accusize 6987-0918 Precision Expanding Mandrels are made of high-grade tool steel, which gives the toolset relatively much longer tool life.The precision expanding mandrels are much more economically than traditional arbors. Features: Made of high-grade tool steel. Precision ground and heat-treated for maximum concentricity and holding power. Center holes are ground and lapped. The automatic expansion feature can be utilized on any bore (standard or non-standard) within the range of the mandrel. Sizes up to 1" capacity are furnished with 1 sleeve: larger sizes are furnished with 2 sleeves (1 large and 1 small). Arbors are tapered, sleeves are flexible and size is obtained by moving sleeves along the arbor. A range from 1/2" thru 2" by 0.0001" can be covered by a total of 8 mandrels.Packed in a fitted wooden box. Size Range(D) Length of Arbor(L) Length of Sleeve(H) Sleeves Furnished 1/2" - 9/16" 5" 2-1/2" 1 9/16" - 21/32" 6" 2-3/4" 1 21/32" - 3/4" 7" 2-3/4" 1 3/4" - 7/8" 7" 3-1/4" 1 7/8" - 1" 7" 3-1/4" 1 1"- 1-1/4" 9" 4" 2 1-1/4" - 1-1/2" 9" 4" 2 1-1/2" - 2" 11-1/2" 5" 2
