**Product Name:** Large Hex Head Iron Black Bolt for Building Construction, Iron Black Bolt, Hex Bolt Product, Special Alloy Fastener
**Process Method:** Cold forming / cold forging & hot forging
**Size:** Diameter M8-M52 (5/16"-2"), Length 40mm-500mm (1-1/4"-20")
**Bolt Type:** ASTM A307M/325M/490M, F1852, F2280, DIN931/DIN933/DIN930/DIN961/DIN960/DIN6914, JIS, ISO
**Standard:** ASTM A307M/325M/490M, F1852, F2280, DIN931/DIN933/DIN930/DIN961/DIN960/DIN6914
**Surface Finish:** Black, Phosphating and Saponification, HDG, Hot Dip Galvanized, Dacromet
**Grade:** 4.8, 6.8, 8.8S, 10.9S, 12.9S
**Size Tolerance:** +/- 2.5% to -2.5%
**Weight Tolerance:** +/- 2.5% to +2.5%
**Tensile Strength:** 400~830MPa / 830~1030MPa / 1040~1240MPa
**Head Type:** Round Head, Hex Head, Square Head, Allen Head, Hexagon Socket Head
**Packaging:** Carton Box + Wooden Pallet or Tin Containers + Wooden Pallet or as per customer request
**Material Chemical Composition:** C: 0.28-0.50, Si: 0.13-0.37, Mn: ≥0.57, P: ≤0.045, S: ≤0.045, Cr: ...
*Contact us for more detailed material information.*
**Certifications:** API, ISO, SGS, BV
**Production Capacity:** 600 tons/month
**Delivery Terms:** FOB/CIF/CFR/DAP or discuss other terms with us
**Lead Time:** 15-30 days after deposit received or L/C received in our bank
**Application Range:** Machinery, mechanical equipment, automotive industry, transmission and distribution, roads, bridges, tunnels, urban rail systems, high-speed railways, watercraft, thermal power, wind power, nuclear power, petrochemical, aerospace, steel roof construction, and more.
**Advantages:**
1. We offer factory prices along with trading company services.
2. We strictly control the production quality to ensure no defects.
3. We guarantee a 24-hour response and 48-hour solution delivery.
4. We accept small order quantities before formal cooperation.
**Company:** Jiaxing Kox Import & Export Trading Co., Ltd.
**Products Offered:**
- Power Metallurgy Gears
- Precision Stamping Parts
- CNC Machining Parts
- Titanium Screws
- Bridge Dedicated Fastening Parts
- All Types of Bolts and Nuts
**Website:** [https://kox-fe.en.made-in-china.com/](https://kox-fe.en.made-in-china.com/)
**Free Samples:**
- Free Punching Part samples are available only for regular clients.
- New clients will not receive free samples.
- Shipping costs are borne by the client.
**Type of Company:** Manufacturer
**Pre-Sale Service:**
- MOQ: 20pcs/model
- Sample testing is required before placing an order.
- Bulk orders will follow the sample strictly.
**Certifications:** ROHS, SGS, CE, ISO
**Payment Terms:** T/T, L/C, WU, MoneyGram
**Production Capacity:** 1000-5000 pcs/set per day
**Contact Us:**
- Feel free to contact us; we're here to help you.
- Online service hours: 9:00 am to 6:00 pm (Beijing Time)
**Image 1:** [High Tensile Bolts and Nuts / Hex Bolts and Nuts DIN](http://i.bosscdn.com/uploads/f5/4d/53/e4cd91cdf5de830a86b41e0bce.jpg)
**Image 2:** [High Tensile Bolts and Nuts / Hex Bolts and Nuts DIN](http://i.bosscdn.com/uploads/48/32/ba/35586d6f468f995f0074768e00.jpg)
This product is ideal for heavy-duty applications in construction, industrial machinery, and infrastructure projects. Whether you need standard or custom fasteners, we provide high-quality solutions tailored to your needs. Let’s work together to find the best option for your project.
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WENZHOU ICL INDUSTRIAL CO., LTD. , https://www.cniclsteel.com