A double end bolt features threading on both ends with an unthreaded shank between them. This design accommodates nuts on either side for fastening components from both ends in flanges, valves, and structural assemblies. Both ends are chamfered to facilitate installation and alignment.
The unthreaded center section maintains proper alignment, reduces bending stress, and ensures consistent performance under axial loads. Double end bolts provide uniform load distribution and enhance sealing integrity in pressurized systems, making them suitable for environments with constant vibration, pressure, or heavy loads. Several types exist: equal threaded studs have identical thread lengths on both ends; unequal threaded variants feature longer threads on one end; tap end studs include a short thread for tapped holes and a longer thread for nuts; full threaded studs have threading along the entire length; reduced shank types have a smaller center diameter for weight reduction.
Common materials include carbon steel for high strength and cost-effectiveness, stainless steel grades 304 and 316 for corrosion resistance, and alloy steels such as American Society for Testing and Materials (ASTM) A193 B7 for high-temperature and high-pressure applications. Manufacturing standards include ASTM A193, A194, and A320, Society of Automotive Engineers (SAE) J1102, International Organization for Standardization (ISO) 898-1, Deutsches Institut für Normung (DIN) specifications, and American Society of Mechanical Engineers (ASME) guidelines.
Applications span construction, automotive assemblies, oil and gas flange connections, power generation plants, marine environments, and wind turbines. Specifications range from M12 to M64 diameter with Unified National Coarse (UNC), Unified National Fine (UNF), or metric threads, and finishes including zinc plating, hot-dip galvanizing, or polytetrafluoroethylene (PTFE) coating for enhanced durability.
Certified Double End Bolt Solutions by RaxPower Wholesaler
At RaxPower, we build custom double-end bolts for projects that demand strength, precision, and durability.
These threaded rods feature threading on both ends with an unthreaded center section that maintains alignment and distributes load evenly, making them ideal for high strength bolting in demanding applications such as oil and gas, valves, water pipeline, wind turbine, and structural joints.
Engineered with precision, our double-end bolts are crafted from premium-grade materials and undergo meticulous manufacturing processes including advanced hot forging, which results in parts with greater strength and more accurate sizing compared to alternatives.
With over 21 years of manufacturing expertise, RaxPower employs strict in-house quality control, from raw material selection to multi-stage testing, ensuring 100% quality through automatic machines for uniform sizing and hot-dip galvanizing per ISO 1461 for enhanced corrosion resistance.
Our commitment to precision and customer-centric manufacturing is backed by load tests and SGS certifications, providing reliable performance for critical connections. Contact RaxPower today to discuss your custom fastener needs and experience our unparalleled service.
| Parameter | Specification |
|---|---|
| Standard | ASTM A193, ASTM A194, ASTM A320, DIN 975, DIN 976, ASME B18.31.2, ISO 898-1 |
| Size | M12 to M64, 1/2″ to 3″ |
| Thread Type | UNC, UNF, metric |
| Material | Carbon Steel, Stainless Steel (304, 316), Alloy Steel (e.g., ASTM A193 B7) |
| Grade | 8.8, 10.9, ASTM A193 B7, A2-70, A4-70 |
| Finish | Zinc plating, Hot-dip galvanizing, Dacromet, PTFE |
| Length Range | 3 mm to 1000 mm |
| Application | Flanges, valves, structural assemblies, automotive, oil & gas, power plants, marine environments, wind turbines |
Frequently Asked Questions (FAQS)
What is a double end bolt?
A double end bolt is a fastener with threading on both ends and an unthreaded center section, designed for applications where tightening from both sides is necessary, providing secure connections and uniform load distribution.
What are the benefits of using double end bolts?
Benefits include stronger connections, easier assembly, improved torque, durability, uniform load distribution, enhanced sealing integrity, and minimized risk of leakage.
What types of double end bolts are available?
Available types include equal threaded double end studs, unequal threaded double end studs, tap end studs, full threaded studs, and double end studs with reduced shank, each suited for specific applications.
What materials are double end bolts made from?
Double end bolts are made from materials such as carbon steel, stainless steel (e.g., 304, 316), alloy steel, Inconel, Monel, Hastelloy, and Titanium, selected based on strength, corrosion resistance, and environmental factors.
What standards do double end bolts comply with?
They are manufactured to meet standards like ASTM A193, A320, DIN, ISO, and ASME, ensuring quality, compatibility, and performance across industrial applications.
What industries commonly use double end bolts?
Double end bolts are used in material handling, trucking, construction, automotive, power generation, oil & gas, petrochemical, heavy machinery, and telecommunication infrastructure including ADSS/OPGW fiber optic cable installations for reliable fastening in demanding applications.
How are double end bolts installed?
Installation typically involves threading one end into a tapped hole or structure and securing the other end with a nut, allowing for easy assembly and reliable clamping.
How do you ensure quality and reliability for critical infrastructure applications?
Our double end bolts comply with international standards such as ASTM A193 and undergo strict quality control including load testing and certification by authoritative bodies like SGS. We utilize advanced techniques like hot forging to achieve high strength and precise dimensions, ensuring reliability for demanding applications in power transmission, distribution, and telecommunication infrastructure.
How does your manufacturing approach deliver consistent quality and cost savings for OEM clients?
We employ precision manufacturing methods, including in-house forging and automated machinery, to produce double end bolts with uniform quality and dimensional accuracy. Rigorous multi-stage testing and quality assurance protocols ensure every batch meets specified standards, while efficient operations and economies of scale allow us to offer competitive pricing without compromising durability or performance.
Can you handle large-volume orders and guarantee on-time delivery?
Yes, we manage bulk orders efficiently with substantial inventory and automated production processes. Our extensive warehousing and logistics capabilities enable us to meet project schedules and ensure complete, on-time delivery for large-scale initiatives.
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