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High-Strength Socket (Allen) & Square Head Bolts M6–M30
High-strength socket (Allen) and square head bolts M6–M30 are heavy-duty fasteners made from high-grade steel or stainless steel. Socket (Allen) bolts have a recessed hex drive for high torque in tight spaces; square head bolts give a large bearing face and easy wrenching for rough use. They are built for strong, lasting joints in machines, structures, and vehicles.
Usage scenarios:
- Join steel frames, beams, and structural parts in construction and civil works where load-bearing strength is needed.
- Fit machines, engines, and tight assemblies with Allen bolts for a low-profile, high-torque fix; use square head bolts on heavy equipment, rail, and farm gear for easy hand fitting and anti-rotation.
- Ideal for repair, maintenance, and fabrication in automotive, industrial plants, wind power, and oil & gas applications where safety and long life matter.
Usage scenarios:
- Join steel frames, beams, and structural parts in construction and civil works where load-bearing strength is needed.
- Fit machines, engines, and tight assemblies with Allen bolts for a low-profile, high-torque fix; use square head bolts on heavy equipment, rail, and farm gear for easy hand fitting and anti-rotation.
- Ideal for repair, maintenance, and fabrication in automotive, industrial plants, wind power, and oil & gas applications where safety and long life matter.
Product advantages
Engineered by a team with decades of fastening expertise, these high-strength Allen socket and square head bolts (M6–M30) are cold-headed, precision-machined and heat-treated to tight tolerances for reliable, repeatable performance. Offered in high tensile grades (up to 12.9) with plated or stainless finishes, they deliver superior torque capacity, fatigue resistance and corrosion protection for heavy machinery, structural and automotive applications. Key features and advantages include a wide size range (M6–M30), optimized socket and square head geometry for anti-slip installation and high torque transfer, ISO-standard threads for interchangeability, and strict quality testing that minimizes downtime and maintenance.
We serve
We serve manufacturers and distributors with high-strength socket (Allen) and square-head bolts in sizes M6–M30. Core attributes include precision threading, hardened alloy steel or stainless construction, and compliance with Grade 8.8, 10.9 and 12.9 specifications, ensuring reliable clamping force and fatigue resistance. Value attributes cover fast lead times, scalable volume production, bespoke lengths and finish options, rigorous inspection and certification, and responsive technical support for torque and application guidance. We offer competitive pricing, flexible MOQ for OEM orders, secure packaging and global logistics coordination. Our commitment: consistent performance, traceable quality and service that keeps your projects on schedule every day.
Why choose us
We serve precision-driven customers with high-strength socket (Allen) and square head bolts in sizes M6–M30. Our service emphasizes certified materials (alloy steel, heat-treated), strict quality control (traceable batch testing, hardness and tensile verification), and compliance with ISO/ASTM standards. Benefits include fast, customizable production runs, competitive bulk pricing, and tailored surface treatments (zinc, black oxide, galvanizing). We provide technical support, free samples for validation, flexible packaging, and reliable lead times with global shipping options. After-sales inspection reports, warranty, and responsive customer service ensure your assemblies meet performance and safety requirements—delivering durability, consistency, and supply-chain confidence and cost-effective inventory management solutions today.
Product Introduction
Allen Head Bolts are bolt fasteners with hexagon hole or hex socket punched into the head of the bolt along with externally threaded body
Product Parameters
Allen 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.