50 Pcs Carriage Bolts, Coach Bolts,Neck Carriage Bolt, Round Head, Square Neck, Zinc Plated （M4-0.7x20mm）

Product: Carriage Bolts; Material: Carbon steel galvanized; Dimension: M4 x 20mm; For more detailed dimensions, please see the size chart Designed with a round head, square neck and Carbon steel galvanized material. Not easy to slip when installed. Due to the head there is no groove type that can be used with a power assisting tool. It can also be hidden during actual use to prevent disassembly. Precision forged, acid and alkali resistant, corrosion resistant and resistant to oxidation.The thread is smooth and flat, the squat is evenly stressed, and the screw teeth are stronger. Used widely in the home and office appliances, communication equipment, ship assembly, and other machinery industry.