discount 70% in 2018-09-25 to 2018-09-27
price: USD$ 40.60
freight :USD$7.00,(Postal parcel)
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Two, spiral groove tap (EX-SFT)
1:EX-SFT standard conventional blind hole can also be used through holes.
2: standard goods standing stock, screw wire attack and general straight groove wire attack is different, ordinary straight groove wire attack groove into linear type, and spiral wire attack is spiral type. When the screw thread is used to attack the tooth, the iron filings can be easily discharged from the hole by the spiral rotation of the spiral groove, so as to avoid the residual iron or the blockage in the groove, and cause the broken edge of the wire tapping and breaking, so that the life of the wire tapping can be increased and the thread with the highest precision can be cut out. Spiral wire tapping is suitable for cutting high toughness materials, but not suitable for fine chips such as cast iron. Three. Explanation of oxidation: Oxidation (Homo) is the tool to deal with 500 ~ 550oC in 30 heating steam to 60 minutes, the tool to generate Fe3O4 layer on the surface, this is a kind of oxidation, the oxide film thickness in the range of 1 to 3 mu. This is a porous membrane because of the reason, to maintain cutting oil to reduce friction heat, prevent wire into the attack surface effect. It is very effective for high tensile steel, stainless steel, cast steel and other materials.