Общий каталог Yamawa 2022 - 2023 - страница 1200

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Technical Description of productsInformation 16. Bored hole size before tapping ( for thread forming ) ■ for Unified Threads Unit：mm Expected minor Expected minor Size Class Bored Hole Size Diameter of Internal Size Class Bored Hole Size Diameter of Internal Thread Size Thread Size No.0-80UNF G5 1.43 1.26 G6 3.85 No.1-72UNF G5 1.75 1.56 No.8-32UNC G7 3.86 3.44 G4 2.01 G8 3.88 G5 2.03 G5 3.88 No.2-56UNC 1.81 No.8-36UNF 3.53 G6 2.04 G6 3.89 G7 2.05 G6 4.39 No.10-24UNC 3.86 No.2-64UNF G4 2.03 1.85 G7 4.40 G4 2.31 G6 4.50 No.3-48UNC 2.07 No.10-32UNF 4.09 G5 2.33 G7 4.51 No.3-56UNF G4 2.34 2.13 No.12-24UNC G6 5.04 4.50 G5 2.61 No.12-28UNF G6 5.10 4.64 No.4-40UNC G6 2.62 2.30 G6 5.80 G7 2.64 1/4-20UNC G7 5.82 5.15 G5 2.65 G8 5.83 No.4-48UNF 2.39 G6 2.66 G6 5.96 1/4-28UNF 5.50 No.5-40UNC G5 2.94 2.62 G7 5.97 G5 2.96 5/16-18UNC G7 7.33 6.61 No.5-44UNF 2.67 G6 2.97 3/8-24UNF G7 9.07 8.54 G5 3.19 7/16-14UNC G8 10.32 9.40 No.6-32UNC G6 3.20 2.80 7/16-20UNF G8 10.57 9.92 G7 3.21 1/2-13UNC G8 11.84 10.86 No.6-40UNF G5 3.25 2.95 1/2-20UNF G8 12.15 11.50 ■ for Helical Coil Wire Screw Thread Inserts Unit：mm ■ SURZ SURZ adopts special design on the thread root of tap, and is applicable tothe control of minor diameter of internal threads and seams of thread crests. Unit：mm Size Class Bored Hole Size Expected minor Diameterof Internal Thread SizeSize Class Recommendedbored hole sizes Size Class Recommendedbored hole sizes STI M3 × 0.5 G3 3.41 3.18 M1 × 0.25 G4 0.90 M2.3 × 0.4 G4 2.12 STI M4 × 0.7 G4 4.57 4.24 M1.2 × 0.25 G4 1.10 M2.5 × 0.45 G4 2.30 STI M5 × 0.8 G4 5.65 5.27 M1.4 × 0.3 G4 1.28 M2.6 × 0.45 G5 2.40 STI M6 × 1 G4 6.80 6.33 M1.6 × 0.35 G4 1.46 M3 × 0.5 G5 2.77 STI M8 × 1.25 G4 9.01 8.40 M1.6 × 0.2 G3 1.52 No. 2 - 56UNC G4 1.98 STI M10 × 1.5 G5 11.21 10.47 M1.7 × 0.35 G4 1.56 No. 4 - 40UNC G5 2.55 STI M10 × 1.25 G5 11.02 10.40 M2 × 0.4 G4 1.82 No. 6 - 32UNC G5 3.14 STI M12 × 1.75 G6 13.42 12.54 *Recommended bored hole sizes shown above aim at 90% percentage of STI M12 × 1.5 G6 13.21 12.47 thread engagement, and are decided by paying attention to tap breakage possibility based on our test results. STI M12 × 1.25 G6 13.01 12.40 *Material deformation can slightly change depending on material, hardness and shape of workpiece and cutting condition, and hole sizes should be changed accordingly. Please choose the suitable bored hole size. ■ for Miniature Screw Threads Unit：mm Size Class Bored Hole Size S0.6 × 0.15 GS2 0.55 S0.7 × 0.175 GS3 0.63 S0.8 × 0.2 GS3 0.72 S0.9 × 0.225 GS4 0.81 Concerning bored hole sizes for metric extra fine screw series, please contact Yamawa or The Japan Research Institute for Screw Thread and Fastener. Technical-49