discount 70% in 2018-09-17 to 2018-09-19
price: USD$ 98.00
freight :USD$7.00,(Postal parcel)
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Brand: OSG long spiral screw
Material: HSS-E (cobalt high speed steel)
Standard: metric / us
Eat: 2.5 teeth
Surface treatment: no
Precision grade: JIS
Groove type spiral groove.
Chip: on chip (for through hole / blind hole), shank extension processing, suitable for high hole tapping work products.
Application materials: carbon steel, high carbon steel, stainless steel, bronze, copper, aluminum, magnesium alloy and so on.
Features: spiral screw and hand tapping is different, ordinary hand groove silk attack line type, and the spiral screw is a screw type. Spiral screw in tapping, to increase its rotation of the spiral groove, can easily cut iron from the hole, so as to avoid iron residue or blockage in the trench, caused by tapping broken edge crack, so it can increase the life of wire tapping and cutting out the thread of the highest precision. Spiral screw is suitable for cutting materials with high toughness, and is not suitable for cast iron scraps into fine materials.