Expansion bolt with hole Xinlan Fasteners remains a family run business.A great history brings a great deal of experience, unrivalled in the Fastener and Special Bolting Industry. stud bolt,Expansion bolt,Mining Anchor nuts,U bolt,Threaded rod,Segment Bolt. PRODUCTS DESCRIPTION The size of perforation is based on the diameter of the expansion pipe of the expansion screw, and the size of the hole depends on the diameter of the expansion pipe. Established in our earliest form in 2005, Xinlan Fasteners remains a family run business.A great history brings a great deal of experience, unrivalled in the Fastener and Special Bolting Industry. We are still a privately owned company and are experts in our field. expansion bolt China XinLan has proudly become a major supplier of prototype and full production quantities to numerous industries including: Building, machinery, railway, hoisting，steel, power plants, ports and Metal Fabricating. XinLan continues to lead the way in the precisiornnachined fastener industry because we listen and respond to the needs of our customers by providing Expansion bolt with hole manufacturer:Yongnian Xinlan Fasteners Co., Ltd. Yongnian Xinlan Fastener Co., Ltd. is not only a supplier of drilling screws, but also produces internal expansion bolts, GB bolts, hexagon bolts, special bolts, 35CrMoA nuts, 8 nuts, 10 nuts, 45# nuts, GB nuts. , special-shaped nuts, flange nuts, square nuts, hot-dip galvanized standard parts, rigging, engineering machinery parts and other products.