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JM Hardware Heavy Duty Carriage Bolt – Square Shoulder, Anti-Turn Fastener
Imagine building a sturdy wooden deck on a sunny afternoon, and every bolt holds tight like a trusted friend. The JM Hardware Heavy Duty Carriage Bolt, with its square shoulder and anti-turn design, grips firmly to keep your project rock solid—no slipping, no spinning. It’s the silent hero that turns your hard work into a masterpiece, ensuring strength and durability in every connection.
Product advantages
JM Hardware Heavy Duty Carriage Bolts feature a robust square shoulder design that ensures secure fastening and prevents rotation during installation, providing enhanced stability and durability. Crafted with premium materials, these bolts offer exceptional strength and corrosion resistance, making them ideal for demanding construction and industrial applications. Their versatile functionality and precise engineering deliver reliable performance in both wood and metal fastening projects.
We serve
We serve professionals and DIY enthusiasts who demand strength, reliability, and precision in their fasteners. Our JM Hardware Heavy Duty Carriage Bolt features a durable square shoulder design that prevents rotation, ensuring a secure and stable fit in wood and metal applications. Engineered for heavy-duty use, this anti-turn fastener delivers exceptional resistance to loosening under vibration or pressure. Whether for construction, machinery, or outdoor projects, we provide high-quality hardware solutions that maximize safety and performance. Committed to excellence, we serve your projects with products built to last and backed by trusted craftsmanship.
Why choose us
We serve professionals and DIY enthusiasts who demand reliable, high-quality fastening solutions. Our JM Hardware Heavy Duty Carriage Bolt features a robust square shoulder design to prevent turning during installation, ensuring a secure and stable fit every time. Crafted from premium materials, this anti-turn fastener offers exceptional strength and corrosion resistance, making it ideal for heavy-duty applications both indoors and outdoors. We are committed to providing durable, precise hardware that enhances your projects’ safety and longevity. Trust JM Hardware to deliver performance, durability, and ease of use for all your fastening needs. Your project’s success is our priority.
Product Introduction
A carriage bolt is a type of fastener that can be made from a number of different materials (stainless steel being the most popular). A carriage bolt generally has a round head and a flat tip and is threaded along part of its shank. Carriage bolts are often referred to as plow bolts or coach bolts and are most commonly used in wood applications. However, they are much more diverse than people might think.
Product Parameters
Carriage bolt | |
Size: | 1/4”-1”,M6-M30 |
Material: | Carbon Steel |
Grade: | A307 Gr. A; SAE J429 Gr.2, 5,8 Class: 8.8, 10.9, 12.9 A2-70, A2-80, A4-70, A4-80 (Stainless Steel) |
Finish: | Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G. |
Product Details
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
Magnetic particle flaw detectorTest report
SGS testing report --310S bolt nut
Third-party testing report-P1
Third-party testing report-P2
JM Hardware® testing report
Packing
Why Choose Us
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.