a3 a4 a4 a4 a4 a4 a4 a4 a4 a4 nominal
refracted beam angle in steel 0° lw 45° sw 45° lw ... 89 32 1.10 28 1.27 32 1.27 29 1.14 30
1.20 28 1.10 27 1.06 28 1.10 45 1.77 45 1.77 ... 16 58 2.28 53 2.08 50 1.97 48 1.89 56
2.20 48 1.89 59 2.32 90 3.54 89 3.50 86 3.38 ... 76 2.99 78 3.07 w n/a n/a n/a n/a 30
1.20 40 1.57 40 1.57 40 1.57 40 1.57 45 1.77 ... a n/a n/a n/a n/a n/a h 11 0.42 25 1.00
20 0.80 21 0.85
20 0.79 17 0.67 24 0.94 16 ... 0.65 21 0.83 27 1.06 42 1.65
20 0.80 38 1.48 34 1.34 43 1.69 40 1.58 35 ... 1.38
20 0.79 30 1.18 49 1.93 32 1.26 40 1.57 26 ... 1.02 33 1.30 31 1.22 28 1.10
20 0.79 51 2.00 85 3.35 45 1.77 68 2.68 32 ...