目次
キーの強度計算
トルクからの算出
キーにかかるせん断応力

入力 | キーの幅 [mm] | $$b$$ | |
キーの長さ [mm] | $$l$$ | ||
抜きタップの呼び [mm] | $$m$$ | ||
せん断面のボルト穴径(※1) [mm] | $$d_h$$ | ||
せん断面のボルト穴数 [-] | $$n_h$$ | ||
軸径 [mm] | $$d$$ | ||
トルク [N・m] | $$T$$ | ||
許容せん断応力 [N/mm2] | $$\tau_s$$ | ||
結果 | せん断力を受ける面の面積 [mm2] | $$A=bl-\frac{\pi m^2}{4}-n_h\frac{\pi d_h^2}{4}$$ | |
せん断応力 [N/mm2] | $$\tau=\frac{2T\cdot10^3}{dA}$$ | ||
安全率 [-] | $$S=\frac{\tau_s}{\tau}$$ |
- 1:せん断力を受ける面がザグリ穴部の場合は、ザグリ穴の径を入力してください。
キーにかかる圧縮力

入力 | キーの高さ [mm] | $$h$$ | |
キー長さ [mm] | $$l$$ | ||
抜きタップの呼び [mm] | $$m$$ | ||
せん断面のボルト穴径(※1) [mm] | $$d_h$$ | ||
せん断面のボルト穴数 [-] | $$n_h$$ | ||
トルク [N・m] | $$T$$ | ||
軸径 [mm] | $$d$$ | ||
許容圧縮応力 [N/mm2] | $$\sigma_s$$ | ||
結果 | 圧縮力を受ける面の面積 [mm2] | $$A=\frac{h}{2}(l-m-n_hd_h)$$ | |
圧縮応力 [N/mm2] | $$\sigma=\frac{2T\cdot10^3}{dA}$$ | ||
安全率 [-] | $$S=\frac{\sigma_s}{\sigma}$$ |
- 1:せん断力を受ける面がザグリ穴部の場合は、ザグリ穴の径を入力してください。
接線力からの算出
キーにかかるせん断応力

入力 | キーの幅 [mm] | $$b$$ | |
キーの長さ [mm] | $$l$$ | ||
抜きタップの呼び [mm] | $$m$$ | ||
せん断面のボルト穴径(※1) [mm] | $$d_h$$ | ||
せん断面のボルト穴数 [-] | $$n_h$$ | ||
接線力 [N] | $$F$$ | ||
許容せん断応力 [N/mm2] | $$\tau_s$$ | ||
結果 | せん断力を受ける面の面積 [mm2] | $$A=bl-\frac{\pi m^2}{4}-n_h\frac{\pi d_h^2}{4}$$ | |
せん断応力 [N/mm2] | $$\tau=\frac{F}{A}$$ | ||
安全率 [-] | $$S=\frac{\tau_s}{\tau}$$ |
- 1:せん断力を受ける面がザグリ穴部の場合は、ザグリ穴の径を入力してください。
キーにかかる圧縮力

入力 | キーの高さ [mm] | $$h$$ | |
キー長さ [mm] | $$l$$ | ||
抜きタップの呼び [mm] | $$m$$ | ||
せん断面のボルト穴径(※1) [mm] | $$d_h$$ | ||
せん断面のボルト穴数 [-] | $$n_h$$ | ||
接線力 [N] | $$F$$ | ||
許容圧縮応力 [N/mm2] | $$\sigma_s$$ | ||
結果 | 圧縮力を受ける面の面積 [mm2] | $$A=\frac{h}{2}(l-m-n_hd_h)$$ | |
圧縮応力 [N/mm2] | $$\sigma=\frac{F}{A}$$ | ||
安全率 [-] | $$S=\frac{\sigma_s}{\sigma}$$ |
- 1:せん断力を受ける面がザグリ穴部の場合は、ザグリ穴の径を入力してください。
キーの寸法

b×h | Δb | Δh | c | l |
---|---|---|---|---|
2×2 | 0 ~-0.025 | 0 ~-0.025 | 0.16~0.25 | 6~20 |
3×3 | 0 ~-0.025 | 0 ~-0.025 | 0.16~0.25 | 6~36 |
4×4 | 0 ~-0.030 | 0 ~-0.030 | 0.16~0.25 | 8~45 |
5×5 | 0 ~-0.030 | 0 ~-0.030 | 0.25~0.40 | 10~56 |
6×6 | 0 ~-0.030 | 0 ~-0.030 | 0.25~0.40 | 14~70 |
8×7 | 0 ~-0.036 | 0 ~-0.090 | 0.25~0.40 | 18~90 |
10×8 | 0 ~-0.036 | 0 ~-0.090 | 0.40~0.60 | 22~110 |
12×8 | 0 ~-0.043 | 0 ~-0.090 | 0.40~0.60 | 28~140 |
14×9 | 0 ~-0.043 | 0 ~-0.090 | 0.40~0.60 | 36~160 |
16×10 | 0 ~-0.043 | 0 ~-0.090 | 0.40~0.60 | 45~180 |
18×11 | 0 ~-0.043 | 0 ~-0.110 | 0.40~0.60 | 50~200 |
20×12 | 0 ~-0.052 | 0 ~-0.110 | 0.60~0.80 | 56~220 |
22×14 | 0 ~-0.052 | 0 ~-0.110 | 0.60~0.80 | 63~250 |
25×14 | 0 ~-0.052 | 0 ~-0.110 | 0.60~0.80 | 70~280 |
28×16 | 0 ~-0.052 | 0 ~-0.110 | 0.60~0.80 | 80~320 |
32×18 | 0 ~-0.062 | 0 ~-0.110 | 0.60~0.80 | 90~360 |
36×20 | 0 ~-0.062 | 0 ~-0.130 | 1.00~1.20 | – |
40×22 | 0 ~-0.062 | 0 ~-0.130 | 1.00~1.20 | – |
45×25 | 0 ~-0.062 | 0 ~-0.130 | 1.00~1.20 | – |
50×28 | 0 ~-0.062 | 0 ~-0.130 | 1.00~1.20 | – |
56×32 | 0 ~-0.074 | 0 ~-0.160 | 1.60~2.00 | – |
63×32 | 0 ~-0.074 | 0 ~-0.160 | 1.60~2.00 | – |
70×36 | 0 ~-0.074 | 0 ~-0.160 | 1.60~2.00 | – |
80×40 | 0 ~-0.074 | 0 ~-0.160 | 2.50~3.00 | – |
90×45 | 0 ~-0.087 | 0 ~-0.160 | 2.50~3.00 | – |
100×50 | 0 ~-0.087 | 0 ~-0.160 | 2.50~3.00 | – |
b×h | Δb | Δh | c | l |
- lは表の範囲内でかつ、以下の寸法から選択する。なお、寸法許容差は原則h12とする
6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 32, 36, 40, 45, 50, 56, 63, 70, 80, 90, 100, 110, 125, 140, 160, 180, 200, 220, 250, 280, 320, 360, 400
キー溝の寸法

b×h | 滑動形 | 普通形 | 締込み形 | r1,r2 | t1 | t2 | Δt | d | ||
---|---|---|---|---|---|---|---|---|---|---|
Δb1 | Δb2 | Δb1 | Δb2 | Δb1,Δb2 | ||||||
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 | +0.025 ~0 | +0.060 ~+0.020 | −0.004 ~−0.029 | ±0.0125 | −0.006 ~−0.031 | 0.08 ~0.16 | 1.8 | 1.4 | +0.1 0 | 8 ~10 |
4×4 | +0.030 ~0 | +0.078 ~+0.030 | 0.000 ~−0.030 | ±0.0150 | −0.012 ~−0.042 | 0.08 ~0.16 | 2.5 | 1.8 | +0.1 0 | 10 ~12 |
5×5 | +0.030 ~0 | +0.078 ~+0.030 | 0.000 ~−0.030 | ±0.0150 | −0.012 ~−0.042 | 0.16 ~0.25 | 3.0 | 2.3 | +0.1 0 | 12 ~17 |
6×6 | +0.030 ~0 | +0.078 ~+0.030 | 0.000 ~−0.030 | ±0.0150 | −0.012 ~−0.042 | 0.16 ~0.25 | 3.5 | 2.8 | +0.1 0 | 17 ~22 |
8×7 | +0.036 ~0 | +0.098 ~+0.040 | 0.000 ~−0.036 | ±0.0180 | −0.015 ~−0.051 | 0.16 ~0.25 | 4.0 | 3.3 | +0.2 0 | 22 ~30 |
10×8 | +0.036 ~0 | +0.098 ~+0.040 | 0.000 ~−0.036 | ±0.0180 | −0.015 ~−0.051 | 0.25 ~0.40 | 5.0 | 3.3 | +0.2 0 | 30 ~38 |
12×8 | +0.043 ~0 | +0.120 ~+0.050 | 0.000 ~−0.043 | ±0.0215 | −0.018 ~−0.061 | 0.25 ~0.40 | 5.0 | 3.3 | +0.2 0 | 38 ~44 |
14×9 | +0.043 ~0 | +0.120 ~+0.050 | 0.000 ~−0.043 | ±0.0215 | −0.018 ~−0.061 | 0.25 ~0.40 | 5.5 | 3.8 | +0.2 0 | 44 ~50 |
16×10 | +0.043 ~0 | +0.120 ~+0.050 | 0.000 ~−0.043 | ±0.0215 | −0.018 ~−0.061 | 0.25 ~0.40 | 6.0 | 4.3 | +0.2 0 | 50 ~58 |
18×11 | +0.043 ~0 | +0.120 ~+0.050 | 0.000 ~−0.043 | ±0.0215 | −0.018 ~−0.061 | 0.25 ~0.40 | 7.0 | 4.4 | +0.2 0 | 58 ~65 |
20×12 | +0.052 ~0 | +0.149 ~+0.065 | 0.000 ~−0.052 | ±0.0260 | −0.022 ~−0.074 | 0.40 ~0.60 | 7.5 | 4.9 | +0.2 0 | 65 ~75 |
22×14 | +0.052 ~0 | +0.149 ~+0.065 | 0.000 ~−0.052 | ±0.0260 | −0.022 ~−0.074 | 0.40 ~0.60 | 9.0 | 5.4 | +0.2 0 | 75 ~85 |
25×14 | +0.052 ~0 | +0.149 ~+0.065 | 0.000 ~−0.052 | ±0.0260 | −0.022 ~−0.074 | 0.40 ~0.60 | 9.0 | 5.4 | +0.2 0 | 85 ~95 |
28×16 | +0.052 ~0 | +0.149 ~+0.065 | 0.000 ~−0.052 | ±0.0260 | −0.022 ~−0.074 | 0.40 ~0.60 | 10.0 | 6.4 | +0.2 0 | 95 ~110 |
32×18 | +0.062 ~0 | +0.180 ~+0.080 | 0.000 ~−0.062 | ±0.0310 | −0.026 ~−0.088 | 0.40 ~0.60 | 11.0 | 7.4 | +0.2 0 | 110 ~130 |
36×20 | +0.062 ~0 | +0.180 ~+0.080 | 0.000 ~−0.062 | ±0.0310 | −0.026 ~−0.088 | 0.70 ~1.00 | 12.0 | 8.4 | +0.3 0 | 130 ~150 |
40×22 | +0.062 ~0 | +0.180 ~+0.080 | 0.000 ~−0.062 | ±0.0310 | −0.026 ~−0.088 | 0.70 ~1.00 | 13.0 | 9.4 | +0.3 0 | 150 ~170 |
45×25 | +0.062 ~0 | +0.180 ~+0.080 | 0.000 ~−0.062 | ±0.0310 | −0.026 ~−0.088 | 0.70 ~1.00 | 15.0 | 10.4 | +0.3 0 | 170 ~200 |
50×28 | +0.062 ~0 | +0.180 ~+0.080 | 0.000 ~−0.062 | ±0.0310 | −0.026 ~−0.088 | 0.70 ~1.00 | 17.0 | 11.4 | +0.3 0 | 200 ~230 |
56×32 | +0.074 ~0 | +0.220 ~+0.100 | 0.000 ~−0.074 | ±0.0370 | −0.032 ~−0.106 | 1.20 ~1.60 | 20.0 | 12.4 | +0.3 0 | 230 ~260 |
63×32 | +0.074 ~0 | +0.220 ~+0.100 | 0.000 ~−0.074 | ±0.0370 | −0.032 ~−0.106 | 1.20 ~1.60 | 20.0 | 12.4 | +0.3 0 | 260 ~290 |
70×36 | +0.074 ~0 | +0.220 ~+0.100 | 0.000 ~−0.074 | ±0.0370 | −0.032 ~−0.106 | 1.20 ~1.60 | 22.0 | 14.4 | +0.3 0 | 290 ~330 |
80×40 | +0.074 ~0 | +0.220 ~+0.100 | 0.000 ~−0.074 | ±0.0370 | −0.032 ~−0.106 | 2.00 ~2.50 | 25.0 | 15.4 | +0.3 0 | 330 ~380 |
90×45 | +0.087 ~0 | +0.260 ~+0.120 | 0.000 ~−0.087 | ±0.0435 | −0.037 ~−0.124 | 2.00 ~2.50 | 28.0 | 17.4 | +0.3 0 | 380 ~440 |
100×50 | +0.087 ~0 | +0.260 ~+0.120 | 0.000 ~−0.087 | ±0.0435 | −0.037 ~−0.124 | 2.00 ~2.50 | 31.0 | 19.5 | +0.3 0 | 440 ~500 |
b×h | Δb1 | Δb2 | Δb1 | Δb2 | Δb1,Δb2 | r1,r2 | t1 | t2 | Δt | d |
滑動形 | 普通形 | 締込み形 |