JM Hardware® Special double thread bolt
Special High-Strength Double-Thread Bolt, Custom Sizes
Special High-Strength Double-Thread Bolt, Custom Sizes: a compact, rugged fastener made from heat-treated alloy steel with twin-start threads for faster engagement and improved load distribution. Offered in bespoke lengths, diameters and thread pitches, with precision machining and corrosion-resistant finishes for reliable performance in high-torque, vibration-prone environments. Ideal when space, speed of assembly and superior clamp force matter.
Usage scenarios:
- Heavy construction and infrastructure: securing steel beams, bridge components and wind-turbine assemblies where high load capacity and fatigue resistance are required.
- Industrial and transport equipment: fastening gearboxes, heavy machinery, rail and ship structures, and automotive or aerospace subassemblies that demand precise, high-strength joints.
- Oil & gas, pressure systems and custom engineering: flange connections, pressure-vessel fittings, and bespoke fixtures or repairs that need nonstandard sizes and rapid, repeatable installation.
Usage scenarios:
- Heavy construction and infrastructure: securing steel beams, bridge components and wind-turbine assemblies where high load capacity and fatigue resistance are required.
- Industrial and transport equipment: fastening gearboxes, heavy machinery, rail and ship structures, and automotive or aerospace subassemblies that demand precise, high-strength joints.
- Oil & gas, pressure systems and custom engineering: flange connections, pressure-vessel fittings, and bespoke fixtures or repairs that need nonstandard sizes and rapid, repeatable installation.
Product advantages
Crafted by a specialist engineering brand with decades of fastener innovation, the special high-strength double-thread bolt is manufactured to custom sizes using hardened alloy steel and precision cold forming for uniform thread engagement and optimal load distribution. Its dual-thread geometry delivers simultaneous coarse engagement and fine adjustment for rapid assembly and micro-torque control, while advanced heat treatment and corrosion-resistant coatings ensure exceptional fatigue resistance in harsh industrial conditions. Features include customizable lengths and pitches, high tensile-grade material, tighter tolerances, and standard-socket compatibility; advantages are faster assembly, increased joint strength, reduced maintenance downtime, and reliable performance under vibration.
We serve
We serve customers with premium special high-strength double-thread bolts available in fully customizable sizes and finishes. Engineered for superior tensile performance and precise engagement, our bolts deliver consistent fit, faster assembly, and extended service life. We provide material certification, heat-treatment verification, and corrosion-resistant coatings to match application demands. Custom machining, batch traceability, and rigorous QC ensure repeatable quality for industrial, automotive, and construction projects. Our responsive quoting, small-run prototyping, and scalable production shorten lead times. Dedicated technical support and tailored packaging simplify integration. Partner with us for reliable fasteners engineered to your specifications and backed by service and comprehensive warranty.
Enterprise core strength
We provide tailored high-strength double-thread bolts engineered for peak performance and long service life. Manufactured from premium alloys with precision threading and heat treatment, our bolts deliver superior tensile strength, consistent load distribution, and excellent fatigue and corrosion resistance. Custom sizes, pitches, and finishes are available to meet specific design requirements, with strict quality control, material certification, and dimensional inspection. We offer fast prototyping, engineering support, volume production, flexible packaging, and reliable lead times backed by warranty and responsive after-sales service. Partner with us for dependable fastening solutions that reduce downtime and ensure structural safety. Delivering reliability, compliance, and savings.
Product Introduction
At JM Hardware®, we take pride in offering custom bolt solutions tailored to your specific needs. Custom bolts are a versatile fastening solution designed to meet unique project requirements, offering flexibility in material selection, surface finish, and functionality.
Material and Surface Finish:
Custom bolts can be manufactured from a variety of materials, including stainless steel, carbon steel, alloy steel, brass, and aluminum, among others. The choice of material depends on factors such as environmental conditions, load requirements, and corrosion resistance. Additionally, custom bolts can be finished with coatings such as zinc plating, galvanization, black oxide, or powder coating to enhance durability and appearance.
Functionality:
Custom bolts serve a multitude of purposes across various industries and applications. Whether you need structural bolts for heavy-duty construction projects, precision bolts for machinery assembly, or corrosion-resistant bolts for marine environments, we can tailor the design to meet your specific requirements. From standard hex bolts to specialized flange bolts, we offer a wide range of options to suit your needs.
Product Display
JM Hardware® Special double thread bolt
JM Hardware® Special double thread bolt
Quality Control
JM Hardware conducts product quality control in strict accordance with ISO 9001 standards to ensure that our products meet high quality standards. Below are our five quality control steps:
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Incoming material control
We carry out strict incoming material control by conducting dimensional tests on each batch of raw materials and checking the raw material reports from the steel mills. This ensures that the raw materials we use are within specification and provide a reliable basis for production.
We carry out strict incoming material control by conducting dimensional tests on each batch of raw materials and checking the raw material reports from the steel mills. This ensures that the raw materials we use are within specification and provide a reliable basis for production.
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First part control
After the mold assembly is completed, we conduct a thorough inspection of the first production part and make detailed records. Only qualified first parts can be released to start mass production. This step ensures that the quality of the product meets the standard at the beginning.
After the mold assembly is completed, we conduct a thorough inspection of the first production part and make detailed records. Only qualified first parts can be released to start mass production. This step ensures that the quality of the product meets the standard at the beginning.
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Self-inspection by workers during mass production
In the mass production process, we require the workers of each machine to carry out self-inspection every hour. If any substandard product is found, we will immediately pick or scrap the production within this hour until the problem is solved and meets the standard of conformity, and then we can continue the production. This self-inspection mechanism helps to find and solve problems in time during the production process.
In the mass production process, we require the workers of each machine to carry out self-inspection every hour. If any substandard product is found, we will immediately pick or scrap the production within this hour until the problem is solved and meets the standard of conformity, and then we can continue the production. This self-inspection mechanism helps to find and solve problems in time during the production process.
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QC inspection during mass production
In addition, every two hours, the quality inspection personnel will carry out random inspection on the products of each machine. Only qualified products can continue to flow into the next production stage. If non-conforming products are found, we will take the same selection or scrapping measures and ensure that the problem is properly handled. This helps provide additional quality assurance.
In addition, every two hours, the quality inspection personnel will carry out random inspection on the products of each machine. Only qualified products can continue to flow into the next production stage. If non-conforming products are found, we will take the same selection or scrapping measures and ensure that the problem is properly handled. This helps provide additional quality assurance.
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Finished product control
Finally, after each batch of finished product is made, we conduct random inspections in proportion to the order. Qualified products will be packaged and put into storage, while unqualified products will be returned for further analysis and rectification. We insist on ensuring that the quality of our products meets high standards so that we can provide reliable products to our customers.
Finally, after each batch of finished product is made, we conduct random inspections in proportion to the order. Qualified products will be packaged and put into storage, while unqualified products will be returned for further analysis and rectification. We insist on ensuring that the quality of our products meets high standards so that we can provide reliable products to our customers.
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Non-conforming goods management
According to the process of JMhardware's non-conforming products handling, pick or scrap. And the problem of rectification and tracking reasons to ensure that non-conforming products will not flow into the market.
According to the process of JMhardware's non-conforming products handling, pick or scrap. And the problem of rectification and tracking reasons to ensure that non-conforming products will not flow into the market.
These quality control measures constitute JM Hardware's quality management system, and we are constantly striving to improve the quality of our products and are committed to meeting the needs of our customers. We believe that quality control is the key to our success.
Production equipment
Testing Equipment
Test report
JM Hardware® provides each batch of products with a finished product test report issued by our laboratory. If you need a test report issued by a third party, please inform us separately. The following two templates are for reference
SGS testing report
Third-party testing report
Packing
Why Choose Us
Registered trademarks
RegisterJM in USA，EU ，UK，Quality Assuranc
Strong R&D Capability
Successfully developed 680+ new products in past 16 years
Rich Industry Experience
JM has the rich experience to supply the high quality fasteners to Project contractor
Mature & professional service teams
Provides 24/7 online and offline services for you,70%stuff have 5+ working experience in JM
Rich export experience
15+ years exported to 70+ countries
Supply one-stop service & DDP term
Help clients purchase other products,realize door-to-door service to make international procurement more convenient
Certificate
Valued Partners
JM Hardware @ has exported its hardware parts to over 85 countries around the world.
We will make unremitting efforts to provide hardware parts with high quality and reasonable prices for our customers.
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Contact us
we welcome custom designs and ideas and is able to cater to the specific requirements. for more information, please visit the website or contact us directly with questions or inquiries.
xarella.huang@jm-fastener.comOur address
Add: Rm.27202, No.295 South Lingyan Road, Pudong,Shanghai,P.R.C
Contact person: xarella.huang
Whatsapp: +86 13681923533
Wechat:+86 18621005605
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Since our establishment in 2006, JM has been adhering to the mission of creating maximum value for customers by providing differentiated services, and making a positive contribution to the society.