Hex Bolts & Structural Bolts â Sourcing from Yongnian, China
Overview
Hex bolts are the core product of the Yongnian cluster. Multiple specialized factories inside the district cold-forge hex head bolts across the full range of international standards, sizes, and property classes. HDBolt matches each order to the factory best suited to the grade and volume.
Specifications
| Standards | DIN 931 (partial thread), DIN 933 (full thread), ISO 4014, ISO 4017, ANSI B18.2.1, ASTM A325, ASTM A490 |
|---|---|
| Property Class | 4.8, 5.8, 8.8, 10.9, 12.9 |
| Size Range | M6 â M64 / 1/4" â 2-1/2" |
| Surface Finish | Plain, Zinc Plated (blue, yellow, black), Hot Dip Galvanized, Dacromet, Black Oxide, Geomet |
| Material | Carbon steel (Q235, 45#, ML35, SCM435), Alloy steel |
| Typical Lead Time | Stock items: 7â15 days. Custom production: 25â45 days. |
Frequently Asked Questions
What is the difference between DIN 933 and DIN 931 hex bolts?
DIN 933 hex bolts are fully threaded along their entire shank. DIN 931 hex bolts are partially threaded, with a smooth shank under the head and threading only on the lower portion. DIN 933 is typically used in through-hole applications with nuts; DIN 931 is preferred when the smooth shank needs to absorb shear loads or pass through a bearing surface.
What does Grade 8.8 mean on a bolt?
Grade 8.8 is a property class defined in ISO 898-1. The first number (8) indicates the nominal tensile strength of approximately 800 MPa. The second number (0.8) indicates that the yield strength is 80% of the tensile strength, or approximately 640 MPa. Grade 8.8 bolts are the most common medium-carbon steel high-strength bolts used in general industrial and structural applications.
Can you supply ASTM A325 structural bolts?
Yes. Several factories in the Yongnian cluster specialize in ASTM A325 and A490 heavy hex structural bolts used in steel construction. We can source these together with matching A563 nuts and F436 washers as a complete structural bolt set, and provide Mill Test Certificates with each shipment.
Need a quote?
Send your item list by WhatsApp or email â we reply within one working day.
đŦ Message on WhatsApp