AGF standard drill sleeve drill bushing size GB

AGF GB standard drill sleeve drill drill sleeve jacket size high accuracy from the borehole, the position of life 1. consideration must have high hardness; 2 surface finish, dimensional tolerances and high precision 3; 4. concentricity characteristics . Good drill sleeve for customers to save more resources and long life for you to save more costs. You might compare other companies drill sets the price, maybe they will be much cheaper than us, but as long as you understand the quality and durability of our products, we are confident that you will continue to choose us! AGF drill sleeve implementation of national standards, internal and external circular grinding, bore accuracy of up to 0.006mm, the concentricity of 0.008mm, finish of 0.8, hardness about HRC60-64 degrees, tungsten steel hardness up to HRC91 degree. Drill sets of standard size and drill and drill sleeve sets of specifications, see: Fixed bit holder GB JB / T 8045.1-1999 interchangeable drill bushing GB JB / T 8045.2-1999 quick change bit holder GB JB / T 8045.3-1999 drill sleeve bushing GB JB / T 8045.4-1999 (For GB Size table please contact us) drill sets Type: drill sleeve can be divided into 1. Fixed drill bushing (A-type and B-type drill bushing fixed fixed drill sets); 2 interchangeable Drill sets; 3 quick-change bit holder; 4 special drill bushing (depending on user requirements) Design drill bushing tolerances instructions (GB drill bushing direct inquiries: Fixed drill bushing national standard JB / T 8045.1-1999 | interchangeable drill bushing GB JB / T 8045.2-1999 | quick change bit holder GB JB / T 8045.3-1999 | drill sleeve bushing GB JB / T 8045.4-1999) need to know the drill bushing GB Specifications, please contact us. ① drill bit holder housing bore hole (also known as the guide hole) diameter of the basic dimensions of the tools used to be a maximum limit of size and a clearance fit shaft basis. When drilling or reaming tolerances take F7 or F8, when crude hinges take G7, when fine hinge take G6. If the drill guide sleeve guide column is part of the tool, you can press the corresponding mating hole basis of selection, such as H7 / f7, H7 / g6 or H6 / g5 and so on. ② length H drill guide sleeve length H orientation and action-oriented tool for large, H is large, the tool bit holder is not easy to deflect, but will speed up the tool and drill sleeve wear; H is too small, then drill oriented in a bad hole. The length of the guide is usually taken to its aperture ratio of H: H / d = 1 ~ 2.5. When high machining accuracy or machining smaller aperture, due less rigid drill bit used, the H / d value can be larger, such as hole diameter d