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Bulông có lỗ sáu cạnh đầu trụ
- Thép, Inox, đồng thau,...
- 4.6, 6.8, 8.8, 10.9
- Mạ kẽm Cr3+, Cr6+ (màu sáng hoặc bảy màu)
- DIN 912, ASME B 18.3 2002,
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