discount 70% in 2018-09-16 to 2018-09-18
price: USD$ 101.78
freight :USD$7.00,(Postal parcel)
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Brand: OSGSpiral sheath screw
Material: HSS-E (cobalt high speed steel)
Standard: metric / us
Eat: 2.5 teeth
Surface treatment: no
Precision grade: JIS
Groove type: straight groove
Chip: the lower chip (with hole)
Application materials: low carbon steel, high carbon steel, alloy steel, bronze, copper, aluminum, magnesium alloy and so on.
Characteristic：Use screw machine (sheathST-SFTUsed for processing internal threads) plus a wire sheath. The sheath is also called screw braces screw female threads sometimes need, while tapping into the coil set, to increase the strength of the female thread, and enhance its durability.ST-SFTWhich is used for cutting the female thread screw, the diameter is increased and the size of the ordinary of the same coil. Suitable for processing blind hole thread processing chip discharged backwards. In the processing of ferrous metal, less smaller spiral angle about choice, generally around 30 degrees, can guarantee the spiral tooth strength. In the processing of nonferrous metal, spiral angle selection a little less about, generally around 45 degrees, so can some sharp cutting.