1. Standard:GB/T 702-2004
2. Shape of section: Round
3.Specification and allowable tolerance:
Diameter mm | Theoretical weight kg/m | Allowable Tolerance mm | Diameter mm | Theoretical weight kg/m | Allowable Tolerance mm | Diameter mm | Theoretical weight kg/m | Allowable Tolerance mm |
5.5 | 0.186 | ±0.30 | 29 | 5.18 | ±0.40 | 80 | 39.4 | ±0.70 |
6 | 0.222 | 30 | 5.55 | 85 | 44.5 | ±1.00 | ||
6.5 | 0.260 | 31 | 5.92 | ±0.50 | 90 | 49.9 | ||
7 | 0.302 | 32 | 6.31 | 95 | 55.6 | |||
8 | 0.395 | ±0.35 | 33 | 6.71 | 100 | 61.6 | ||
9 | 0.499 | 34 | 7.12 | 105 | 67.9 | |||
10 | 0.616 | 35 | 7.55 | 110 | 74.6 | |||
11 | 0.746 | 36 | 7.99 | 115 | 81.5 | ±1.30 | ||
12 | 0.888 | 37 | 8.44 | 120 | 88.7 | |||
13 | 1.04 | 38 | 8.90 | 125 | 96.3 | |||
14 | 1.21 | 40 | 9.86 | 130 | 104 | |||
15 | 1.39 | 42 | 10.9 | 135 | 112 | |||
16 | 1.58 | 45 | 12.5 | 140 | 121 | |||
17 | 1.78 | 48 | 14.2 | 150 | 139 | |||
18 | 2.00 | 50 | 15.4 | 160 | 158 | ±1.80 | ||
19 | 2.22 | 53 | 17.3 | ±0.70 | 170 | 178 | ||
20 | 2.46 | 55 | 18.6 | 180 | 200 | |||
21 | 2.72 | ±0.40 | 56 | 19.3 | 190 | 222 | ||
22 | 2.98 | 58 | 20.7 | 200 | 246 | |||
23 | 3.26 | 60 | 22.2 | 210 | 272 | Dimension ±1.2% | ||
24 | 3.55 | 63 | 24.5 | 220 | 298 | |||
25 | 3.85 | 65 | 26.0 | 230 | 326 | |||
26 | 4.17 | 68 | 28.5 | 240 | 355 | |||
27 | 4.49 | 70 | 30.2 | 250 | 385 | |||
28 | 4.83 | 75 | 34.7 |