"Square Heads" CNS Standards List| Method Test | Ease operation | Glossary terms | Methods Test | Oil Tempered | Electric resistance | Mushroom ventilators | Safety Standards | |
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CNS 66
2017 Edition Square Heads and Holes (for Shaft, Hand Wheel and Handles) 方頭及方孔（用於軸，手輪及手柄） |
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CNS 66
1972 Edition Square Heads and Holes (for Shaft, Hand Wheel and Handles) 方頭及方孔（用於軸，手輪及手柄） |
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