Tolerance for Hot Rolled Flat Bars
Size | Tolerance Rank | ||
Group 1 | Group 2 | Group 3 | |
>7 ~ ≤20 | ±0.25 | ±0.35 | ±0.40 |
>20 ~ ≤30 | ±0.30 | ±0.40 | ±0.50 |
>30 ~ ≤50 | ±0.40 | ±0.50 | ±0.60 |
>50 ~ ≤80 | ±0.60 | ±0.70 | ±0.80 |
>80 ~ ≤110 | ±0.90 | ±1.00 | ±1.10 |
>110 ~ ≤150 | ±1.20 | ±1.30 | ±1.40 |
Tolerance for Hot Forging Flat Bars
Size | Tolerance Rank | |
Group 1 | Group 2 | |
>50 ~ ≤60 | +1.5 -1.0 | +2.0 -1.0 |
>60 ~ ≤80 | +2.0 -1.0 | +2.5 -1.0 |
>80 ~ ≤100 | +2.5 -1.0 | +3.0 -1.0 |
>100 ~ ≤120 | +2.5 -1.5 | +3.0 -1.5 |
>120 ~ ≤140 | +3.0 -1.5 | +3.5 -1.5 |
>160 ~ ≤180 | +4.0 -2.0 | +5.0 -2.0 |
>180 ~ ≤200 | +5.0 -2.0 | +6.0 -2.0 |
>200 ~ ≤220 | +5.0 -3.0 | +6.0 -3.0 |
>220 ~ ≤240 | +6.0 -3.0 | +7.0 -3.0 |
>240 ~ ≤250 | +7.0 -3.0 | +8.0 -3.0 |
>250 ~ ≤300 | +8.0 -3.0 | +9.0 -3.0 |
Tolerance for Cold Drawn Flat Bars
Size | Tolerance Rank | |||||
H8 | H9 | H10 | H11 | H12 | H13 | |
3 | 0 ~ -0.014 | 0 ~ -0.025 | 0 ~ -0.040 | 0 ~ -0.060 | 0 ~ -0.100 | 0 ~ -0.140 |
>3 ~ ≤6 | 0 ~ -0.018 | 0 ~ -0.030 | 0 ~ -0.048 | 0 ~ -0.075 | 0 ~ -0.120 | 0 ~ -0.180 |
>6 ~ ≤10 | 0 ~ -0.022 | 0 ~ -0.036 | 0 ~ -0.058 | 0 ~ -0.090 | 0 ~ -0.150 | 0 ~ -0.220 |
>10 ~ ≤18 | 0 ~ -0.027 | 0 ~ -0.043 | 0 ~ -0.070 | 0 ~ -0.110 | 0 ~ -0.180 | 0 ~ -0.270 |
>18 ~ ≤30 | 0 ~ -0.033 | 0 ~ -0.052 | 0 ~ -0.084 | 0 ~ -0.130 | 0 ~ -0.210 | 0 ~ -0.330 |
>30 ~ ≤50 | 0 ~ -0.039 | 0 ~ -0.062 | 0 ~ -0.100 | 0 ~ -0.160 | 0 ~ -0.250 | 0 ~ -0.390 |
>50 ~ ≤80 | 0 ~ -0.046 | 0 ~ -0.074 | 0 ~ -0.120 | 0 ~ -0.190 | 0 ~ -0.300 | 0 ~ -0.460 |
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