Heavy hex bolts can be made with a few different materials including low and medium carbon steel, alloy, and stainless steel. They are available plain, hot dipped galvanized, phosphate, zinc or cadmium plated for additional corrosion-resistance. Additional finishes are available - please contact us for a quote.
Heavy Hex Bolt Specifications
General heavy hex bolts include ASTM A307 specifications, which covers carbon steel bolts and studs ranging from 1/4” through 4” in diameter. This is the most common heavy hex bolt and includes Grades A, B, and C which denote tensile strength, configuration, and its intended use.
The ASTM A193 specification covers alloy steel and stainless steel bolt materials for high temperature and high pressure applications.
Heavy hex structural bolts are designed for steel-to-steel connections and include ASTM A325 and A490 specifications, which covers bolts from 1/2” up to 1-1/2” in diameter. Since these heavy hex bolts are intended for structural connections, they have shorter thread lengths than standard hex bolts.
Commonly used heavy-duty bolts, nuts and washers | |||
Heavy Structural Bolt | A325 plain | A325 (not plain) | A490 (All surface) |
Heavy Hex Nut | A563 Gr.C,DH or A194 Gr.2H | A563 Gr.DH or A194 Gr.2H | A563 Gr.DH or A194 Gr.2H |
Flat Washer | F436 |
Size: Tension control structural bolts typically range in diameter from 1/2 inch to 1 1/4 inch. The most common diameter is 3/4 inch.
Length: The length of tension control structural bolts varies depending on the application. They can range from a few inches to several feet.
Strength grade: Tension control structural bolts are typically made from high-strength steel with a strength grade of either A325 or A490. A325 bolts have a minimum tensile strength of 120 ksi, while A490 bolts have a minimum tensile strength of 150 ksi.
Coating: Tension control structural bolts are often coated with a protective coating to prevent corrosion. Common coatings include hot-dip galvanizing, mechanical galvanizing, and black oxide coating.
Tension control system: Tension control structural bolts use a unique tension control system that ensures that the correct tension is applied to the bolt during installation. The tension control system consists of a special washer and a hexagonal head that is designed to shear off when the correct tension is reached.
Standards: Tension control structural bolts are manufactured in accordance with standards established by organizations such as ASTM International, the American Institute of Steel Construction, and the Research Council on Structural Connections. These standards ensure that the bolts meet certain specifications for strength, durability, and safety.
JM Hardware® provides free samples of the above products during the Black Friday event. If you have any demand for these products, please contact our email: xarella.huang@jm-industry.com
Brand Story
The inception of the JM Hardware® brand was a profound moment born out of a fateful business trip. During a trip abroad, I was flipping through a newspaper when I came across a heartbreaking story about a steel building that had collapsed due to a batch of substandard fasteners. The tragic images and casualties left an indelible mark on me.
From that moment on, our commitment to putting product quality first became a cornerstone of JM Hardware®, engraved in the DNA of our brand. With this unwavering commitment, JM Hardware® set out to set a new standard for quality. We spend countless hours researching, developing, and testing each product to ensure that they not only meet industry standards, but that they also meet the company's own higher standards. This journey is driven not by profit, but by a deep sense of responsibility - the responsibility to protect a person, a family, a community.
JM Hardware® stands as a testament to that enduring commitment. Every product that bears the JM Hardware® name will be synonymous with excellence, durability and safety.
JM Hardware®: the combination of quality and integrity.
-------- Mrs. Xarella Huang
General President
-
Export 85+countriesUSA Trade Mark
-
18 years R&D 850+ Custom partsEU Trade Mark
-
Help 1000+ oversea customersUK Trade Mark
-
2006Established
-
34000TProduction Quantity Each Year
-
85+Export Country
-
850 +R&D New Products
-
Supply one-stop service & DDP termHelp clients purchase other products,realize door-to-door service to make international procurement more convenient
-
Strong R&D CapabilitySuccessfully developed 850+ new products in past 18 years
-
Mature & professional service teamsProvides 24/7 online and offline services for you,70%stuff have 5+ working experience in JM
-
Rich Industry ExperienceJM has the rich experience to supply the high quality fasteners to Project contractor
-
Registered trademarksRegister JM Hardware ® in USA,EU ,UK,Quality Assurance
-
Rich export experience18 years exported to 85+ countries
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:
Step 1: 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.
Step 2: 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.
Step 3: 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.
Step 4: 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.
Step 5: 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.
Step 6: 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.
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.
Our vision is to make JM Hardware® a well-known Chinese brand of high-end hardware parts in the world,and your cooperation will be an important part of it
If you do not see the product you need, or you have special customization requirements, you can send an email to xarella.huang@jm-industry.com. JM Hardware® will do our best to help you solve the problem
Nominal
Size or Basic Major Dia of Thread |
E | F | G | H | R | LT | Y | Total Runout of Bearing Surface FIM | |||||||
Body Diameter | Width Across Flats | Width Across Corners | Head Height | Radius of Fillet | Thread Length | Transition Thread Length | |||||||||
Max | Min | Nominal | Max | Min | Max | Min | Nominal | Max | Min | Max | Min | ||||
1/2 0.5000 | 0.515 | 0.482 | 7/8 | 0.875 | 0.850 | 1.010 | 0.969 | 5/16 | 0.323 | 0.302 | 0.031 | 0.009 | 1.000 | 0.190 | 0.016 |
5/8 0.6250 | 0.642 | 0.605 | 1-1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 25/64 | 0.403 | 0.378 | 0.062 | 0.021 | 1.250 | 0.220 | 0.019 |
3/4 0.7500 | 0.768 | 0.729 | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.383 | 15/32 | 0.483 | 0.455 | 0.062 | 0.021 | 1.380 | 0.250 | 0.022 |
7/8 0.8750 | 0.895 | 0.852 | 1-7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 35/64 | 0.563 | 0.531 | 0.062 | 0.031 | 1.500 | 0.280 | 0.025 |
1 1.0000 | 1.022 | 0.976 | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 39/64 | 0.627 | 0.591 | 0.930 | 0.062 | 1.750 | 0.310 | 0.028 |
1-1/8 1.1250 | 1.149 | 1.098 | 1-13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 11/16 | 0.718 | 0.658 | 0.930 | 0.062 | 2.000 | 0.340 | 0.032 |
1-1/4 1.2500 | 1.277 | 1.223 | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 25/32 | 0.813 | 0.749 | 0.930 | 0.062 | 2.000 | 0.380 | 0.035 |
1-3/8 1.3750 | 1.404 | 1.345 | 2-3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 27/32 | 0.878 | 0.810 | 0.930 | 0.062 | 2.250 | 0.440 | 0.038 |
1-1/2 1.5000 | 1.531 | 1.407 | 2-3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 15/16 | 0.974 | 0.902 | 0.930 | 0.062 | 2.250 | 0.440 | 0.041 |
-
Bolt
- JM Hardware® Foundation Anchor Bolt / Headed Anchor Bolt / J Bolt Anchor
- JM Hardware® A325 • A490 • Heavy Hex Structural Bolt/ Industrial Bolt(Hex Head/ Tension Control Head)/Thread Rod/Anchor Bolt(Xylan & Zinc/ Aluminum Coating available)
- JM Hardware® Plow Bolt for Heavy Equipment in Farm
- JM Hardware® Timber Bolt/ Economy bolt
- JM Hardware® Clamp U Bolt/Square Bent U Bolt
- JM Hardware® Guardrail Splice Bolt&Nuts/ Guardrail Clamp Attachment Bolt
- JM Hardware® Concrete Bolt/ Screw Anchor/ Confast Screw/ Masonry Screw/ Consert Screw/ Wedge Bolt
- Tension Control Structural Bolt
- Eye bolt
- Hexagon Socket Head Cap Screw
- Carriage Bolt
- Hex Flange Bolt
- Step Bolt
- Tower Bolt
- T Bolt
- Square Head Bolt
- Shoulder Bolt
- JM Hardware® Hex bolt/ Heavy Hex bolt
- Rod / Stud
- Nut
- Washer
- Pin
- Screw
- Rivet
- Photovoltaic accessories