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Hexagon socket bolt China Manufacturer
QS Fastener: Hexagon socket bolt China Manufacturer
Name: Hexagon socket bolt China Manufacturer
Standard: ASTM
Material: A193
Size: M6 to M100
Length: 30 to 1000 mm
Grade: A
Price: USD 2.99 - 9.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASTM
Material: A193
Size: M6 to M100
Length: 30 to 1000 mm
Grade: A
Price: USD 2.99 - 9.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
As a senior fastener engineer, I can confirm that the ASTM A193 Hexagon Socket Bolt is a critical component for demanding bolted connections. Sourced from a reputable China Manufacturer, this fastener combines rigorous material science with precision manufacturing. It is produced in compliance with ASTM standards, using premium A193 material grades, and is available in diameters from M6 to M100 and lengths from 30 mm to 1000 mm. The hexagonal socket drive design ensures reliable torque transfer, simplifies installation in confined spaces, and reduces cam-out risks—making it a field-proven solution for oil pipelines, heavy machinery, chemical plants, and structural building projects.
When you specify a Hexagon socket bolt from a qualified China Manufacturer, you gain access to multiple ASTM A193 grades tailored to your service conditions:
- Grade B7 (Cr-Mo alloy steel): Through quench-and-tempered heat treatment, it delivers tensile strength ≥860 MPa and yield strength ≥725 MPa, with a maximum service temperature of 450°C. Ideal for high-pressure vessels and petrochemical flanges.
- Grade B16 (Cr-Mo-V alloy steel): With vanadium addition, it offers enhanced creep resistance and maintains strength up to 540°C, making it the preferred choice for power generation turbines and boiler applications.
- Grade B8 (austenitic stainless steel, e.g., 304/304L): Excellent general corrosion resistance, tensile strength ≥515 MPa, and high elongation (≥40%) for cryogenic and chemical services.
- Grade B8M (Mo-bearing austenitic, e.g., 316/316L): The molybdenum content (2.0–3.0%) significantly improves pitting and crevice corrosion resistance in chloride-rich marine and pharmaceutical environments.
- Grade B16 (Cr-Mo-V alloy steel): With vanadium addition, it offers enhanced creep resistance and maintains strength up to 540°C, making it the preferred choice for power generation turbines and boiler applications.
- Grade B8 (austenitic stainless steel, e.g., 304/304L): Excellent general corrosion resistance, tensile strength ≥515 MPa, and high elongation (≥40%) for cryogenic and chemical services.
- Grade B8M (Mo-bearing austenitic, e.g., 316/316L): The molybdenum content (2.0–3.0%) significantly improves pitting and crevice corrosion resistance in chloride-rich marine and pharmaceutical environments.
Pricing ranges from USD 2.99 to 9.99 per kg, with a low MOQ of 10 kg, customization available, and delivery within 7–30 days. Selecting the correct grade is not just about strength—it’s about balancing temperature, corrosion, and fatigue life. For high-temperature, high-pressure systems, B7 or B16 are workhorses; for aggressive media, B8M outperforms standard stainless. This Hexagon socket bolt range, manufactured under strict quality control by a leading China Manufacturer, ensures reliable, long-term service across industries. Always match the material grade to your specific operating environment to maximize joint integrity and safety.
FAQ：
1. What is the difference between ASTM A193 Grade B7 and B16 for hexagon socket bolts?
Both are chromium-molybdenum alloy steels, but B16 contains vanadium (0.03–0.08%) and higher molybdenum (0.50–0.65%). This gives B16 superior creep resistance and allows continuous operation up to 540°C, versus 450°C for B7. For steam lines and turbine casings, B16 is preferred; for general refinery flanges, B7 is more cost-effective.
1. What is the difference between ASTM A193 Grade B7 and B16 for hexagon socket bolts?
Both are chromium-molybdenum alloy steels, but B16 contains vanadium (0.03–0.08%) and higher molybdenum (0.50–0.65%). This gives B16 superior creep resistance and allows continuous operation up to 540°C, versus 450°C for B7. For steam lines and turbine casings, B16 is preferred; for general refinery flanges, B7 is more cost-effective.
2. Can I use a B8 stainless steel hexagon socket bolt in high-temperature applications?
B8 (304/304L) retains good toughness but its tensile strength drops above 500°C. It is not recommended for load-bearing high-temperature services above 550°F (288°C) per ASME codes. For corrosive + high-temperature combined environments, consider B8M with better pitting resistance, but always check the derating factors for elevated temperatures.
B8 (304/304L) retains good toughness but its tensile strength drops above 500°C. It is not recommended for load-bearing high-temperature services above 550°F (288°C) per ASME codes. For corrosive + high-temperature combined environments, consider B8M with better pitting resistance, but always check the derating factors for elevated temperatures.
3. What is the standard threading and hardness requirement for these ASTM A193 bolts?
Unified coarse (UNC) or fine (UNF) threads are typical, and all grades must meet the hardness range specified in ASTM A193 (e.g., B7: 235–341 HBW). The hexagonal socket drive is manufactured to ASME B18.3 dimensional tolerances. Always confirm that the China Manufacturer provides mill test reports (MTR) with actual hardness and chemistry values.
Unified coarse (UNC) or fine (UNF) threads are typical, and all grades must meet the hardness range specified in ASTM A193 (e.g., B7: 235–341 HBW). The hexagonal socket drive is manufactured to ASME B18.3 dimensional tolerances. Always confirm that the China Manufacturer provides mill test reports (MTR) with actual hardness and chemistry values.
4. How do I select the right grade among B7, B16, B8, and B8M for chemical plant piping?
Start with operating temperature and fluid corrosivity. For non-corrosive hydrocarbons at ≤450°C, B7 is standard. For sour service or chloride-containing fluids, use B8M (316L) to avoid stress corrosion cracking. For high-temperature steam with minor corrosives, B16 gives extra safety margin. Always consult the NACE MR0175 requirement if hydrogen sulfide is present.
Start with operating temperature and fluid corrosivity. For non-corrosive hydrocarbons at ≤450°C, B7 is standard. For sour service or chloride-containing fluids, use B8M (316L) to avoid stress corrosion cracking. For high-temperature steam with minor corrosives, B16 gives extra safety margin. Always consult the NACE MR0175 requirement if hydrogen sulfide is present.
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