
High-Quality Best-Selling Butterfly Screws and Bolts. High Strength Material: Made of high-quality stainless steel with heat treatment for superior hardness. Anti-Loose Design: Vibration-proof and anti-loose features ensure firm connection and safety. Wide Application: Suitable for steel buildings, bridges, heavy machinery, and wind power equipment. Cost Effective: High cost performance with long service life and easy installation. DIN Standard: Complies with DIN standards, available in A2-70 and A4-70 grades. Fast Delivery: Efficient delivery time of 7-15 working days for bulk orders. Low MOQ: Minimum order quantity is only 1000 pieces, suitable for various scales. Free Samples: Free samples available for customers who confirm the order (freight paid by buyer).