Countersunk Hexagon插座头盖螺钉
黑色头部allen钥匙螺栓主要由高质量的材料制成，以确保耐用性和可靠的固定性能。碳钢是一种常用的基本材料，尤其是在4.8、8.8和10.9等级别中。
内六角螺栓
Hebei Fujinrui Metal Products Co.，Ltd。成立于2004年，位于Hebei Province Handan City。该公司覆盖了10,000平方米的面积，并拥有200多名员工。这是一家企业，将紧固件产品生产和金属表面腐蚀保护与成熟的生产技术团队相结合。在紧固件行业拥有20多年的经验。
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