274 TECHNICAL INFORMATION 1. Parallel Keys and Key Grooves Note(1) The applicable shaft diameter is calculated from the torque corresponding to the strength of the key, for presentation of referential data for general-purpose use. When the key is of an appropriate size relative to the torque to be transmitted, a shaft thicker than the applicable shaft diameter may be used. In some cases, t1 and t2 should be adjusted so that a side of the key will come into uniform contact with the shaft and the hub. A shaft narrower than the applicable shaft diameter should not be used. Reference: The nominal sizes given in ( ) do not conform to the relevant international standard and must not be used in new design. S2 − S1 − b 25 25 ℓ 1.6 1.6 6.3 6.3 h 2 1t t h d c c h b 6.3 1.6 6.3 1.6 b1 2b r1 r2 Unit: mm Section of Key Groove 1 S1=Tolerance of b× 2 1 S2=Tolerance of h× 2 Section of Key Key Nominal Dimension b×h Dimension of Key Groove Reference Reference Dimension of b1, b2 (Sliding Type) Standard Precision Class r1 and r2 Reference Dimension of t1 Reference Dimension of t2 Reference Dimension of t2, t1 Applicable Shaft Dia.(1) d b1 b2 b1 b2 b1 and b2 Tolerance (H9) Tolerance (D10) Tolerance (N9) Tolerance (Js9) Tolerance (P9) 2×2 2 + 0.025 0 +0.060 +0.020 −0.004 −0.029 ±0.0125 −0.006 −0.031 0.08~0.16 1.2 1.0 + 0.1 0 6~8 3×3 3 1.8 1.4 8~10 4×4 4 + 0.030 0 +0.078 +0.030 0 − 0.030 ±0.0150 −0.012 −0.042 2.5 1.8 10~12 5×5 5 0.16~0.25 3.0 2.3 12~17 6×6 6 3.5 2.8 17~22 (7×7) 7 + 0.036 0 +0.098 +0.040 0 − 0.036 ±0.0180 −0.015 −0.051 4.0 3.0 + 0.2 0 20~25 8×7 8 4.0 3.3 22~30 10×8 10 0.25~0.40 5.0 3.3 30~38 12×8 12 + 0.043 0 +0.120 +0.050 0 − 0.043 ±0.0215 −0.018 −0.061 5.0 3.3 38~44 14×9 14 5.5 3.8 44~50 (15×10) 15 5.0 5.0 50~55 16×10 16 6.0 4.3 50~58 18×11 18 7.0 4.4 58~65 20×12 20 + 0.052 0 +0.149 +0.065 0 − 0.052 ±0.0260 −0.022 −0.074 0.40~0.60 7.5 4.9 65~75 22×14 22 9.0 5.4 75~85 (24×16) 24 8.0 8.0 80~90 25×14 25 9.0 5.4 85~95 28×16 28 10.0 6.4 95~110 32×18 32 + 0.062 0 +0.180 +0.080 0 − 0.062 ±0.0310 −0.026 −0.088 11.0 7.4 110~130 (35×22) 35 0.70~1.00 11.0 11.0 + 0.3 0 125~140 36×20 36 12.0 8.4 130~150 (38×24) 38 12.0 12.0 140~160 40×22 40 13.0 9.4 150~170 (42×26) 42 13.0 13.0 160~180 45×25 45 15.0 10.4 170~200 50×28 50 17.0 11.4 200~230 56×32 56 + 0.074 0 +0.220 +0.100 0 − 0.074 ±0.0370 −0.032 −0.106 1.20~1.60 20.0 12.4 230~260 63×32 63 20.0 12.4 260~290 70×36 70 22.0 14.4 290~330 80×40 80 2.00~2.50 25.0 15.4 330~380 90×45 90 + 0.087 0 +0.260 +0.120 0 − 0.087 ±0.0435 −0.037 −0.124 28.0 17.4 380~440 100×50 100 31.0 19.5 440~500 GeneralTechnical Information Machine Keys and Key Grooves
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