1, the screw straightness error shall be selected according to the D-class tolerance in GB 1 184, but it shall not exceed 0.6mm per1000 mm; When the length is less than 5m, the overall straightness error is less than 65438±0.5mm；; ; When the length is not more than 8m, the overall straightness error is not more than 2mm. Thread tolerance is generally manufactured according to Grade 9c accuracy in GB5796.4.
2. The primary pitch error (including periodic error) is not greater than 0.025mm, and the maximum cumulative pitch error: not greater than 0.05mm within 25mm, not greater than 0.05mm within 100mm and not greater than 0.07mm；; Within 300mm; When the length is increased by 300mm, it can increase O.02mm, but the maximum cumulative error of the whole length of the screw is less than 0.5 mm
3, thread working surface must be smooth, no burr, its roughness Ra value is not more than 6.3 microns. ..
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