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High Strength Steel Structure Heavy Hex Bolt GB/T 1228 Alloy Steel. High Strength Grade: Available in Grade 8.8 to 10.9 for heavy-duty applications. Customizable Dimensions: Standard or custom size and thread length options available. Diverse Surface Coatings: Options include HDG, Black, Zinc, and Plated PTFE. Flexible Delivery: In stock availability or approximately 35 days production time. Pre-Shipment Testing: All products undergo rigorous detection before shipment. Sample Availability: Samples are available for testing purposes. Wide Material Range: Materials include 20mntib and 35vb alloy steels. Standard Compliance: Meets GB and GB/T 1228 standards.