Общий каталог Yamawa 2022 - 2023 - страница 1162

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Technical Description of productsInformation d : size designation Length of engagement ■Length of engagement Thread tolerance class is chosen in consideration of "engagement classi cation" and "engagement length". To realize the stable tapping, it is necessary to fully understand the relation between these factors and to choose the suitable tolerance class. On "engagement classi cation: middle", the tolerance class 6H is almost always chosen for standard internal threads. However, in case of "engage- ment length : L", tolerance class 7H can also be chosen. On M12x1.75, the tolerance of 7H is 25% (50μm) larger than that of 6H. And this widens the selection range of the tolerance class for taps to customer's advantage. 【M12x1.75】 6H Pitch diameter : 10.863 ~ 11.063mm (tolerance 0.200 mm) 7H Pitch diameter : 10.863 ~ 11.113mm (tolerance 0.250 mm) 1) Engagement classi cation classi cation application ne precise screw threads with a little allowance middle standard screw threads used for machines, apparatuses and constructions bodies screw threads used for construction and building installation, and screw threads for coarse which threading operation is very di cult such as threading of hot rolled steel bars. 2) Classi cation of engagement length symbol classi cation limit size engagement length S short up to and including 2.24Pd0.2 N normal over 2.24Pd0.2 up to and including 6.7Pd0.2 L long over 6.7Pd0.2 inめteねrじnal thread 3) Selection rule of internal threads and external threads Selection rule of the tolerance class of internal threads externalthおreねaじd tolerance position H engagement length S N L engagement classi cation ne 4H 5H 6H middle 5H 6H 7H coarse - 7H 8H P : pitch  Selection rule of the tolerance class of external threads tolerance position h g engagement length S N L S N L engagement classi cation ne (3h4h) 4h (5h4h) - - - middle (5h6h) 6h (7h6h) (5g6g) 6g (7g6g) coarse - - - - 8g (9g8g) Technical-11