Grade 8.8 Carriage Bolt
The strength grade of carriage bolts is selected according to the working pressure. The performance grades of carbon steel carriage bolts are 3.6, 4.6 and 4.8. The standard can refer to GB3098.1, while the material of stainless steel carriage bolts is mainly austenitic stainless steel, which owns good heat resistance, good corrosion resistance and good weldability.
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Product Introduction
Grade 8.8 carriage bolts are high-strength bolts that are engineered to provide durability and reliability in various applications. They are often used to secure heavy-duty equipment and structures, such as construction platforms, bridges, and machinery. As a manufacturer of Grade 8.8 carriage bolts, I take pride in producing bolts that meet the highest quality standards and exceed customer expectations.
One of the key features of Grade 8.8 carriage bolts is their unmatched strength. These bolts are made from premium materials and undergo rigorous testing to ensure they can withstand high levels of stress and pressure. The designation "8.8" refers to the bolt's minimum tensile strength in megapascals (MPa) - a measure of the bolt's maximum resistance to breaking under tension. In the case of Grade 8.8, this means a minimum tensile strength of 800 MPa, making these bolts one of the strongest bolts available.
Another important aspect of Grade 8.8 carriage bolts is their versatility. They are compatible with a wide range of materials, such as wood, metal, and concrete, which makes them ideal for use in various industries. They come in different lengths and diameters, allowing them to be customized to suit different applications. Additionally, their zinc-plated finish provides corrosion resistance, making them suitable for outdoor use.
Grade 8.8 carriage bolts are also designed for ease of use. They feature a square or hexagonal head that can be tightened with a wrench or pliers, and their threads are designed to facilitate easy installation. This reduces the time and effort required to retrofit or install bolts, which can save merchants both money and time.
The durability of Grade 8.8 carriage bolts also makes them a cost-effective choice. These bolts can withstand the elements, repeated use, and high levels of stress, which means they need less frequent replacements compared to low-grade bolts. This reduces maintenance costs and downtime, making Grade 8.8 carriage bolts a more economical choice in the long run.
When it comes to safety, Grade 8.8 carriage bolts are a trusted choice. They meet international safety standards, such as the ISO 898-1:2013 specifications for bolts, screws, and studs, ensuring they can withstand high loads without compromising safety. This makes them a popular choice in the automotive, aerospace, and oil and gas industries, where safety is paramount.
In summary, Grade 8.8 carriage bolts are a versatile, durable, and cost-effective choice for merchants looking for a high-strength bolt to secure their structures or equipment. As a manufacturer in China, I take pride in producing Grade 8.8 carriage bolts that meet the highest quality standards and exceed customer expectations. Contact us today to learn more about our Grade 8.8 carriage bolts and how they can benefit your business.
The strength grade of carriage bolts is selected according to the working pressure. The performance grades of carbon steel carriage bolts are 3.6, 4.6 and 4.8. The standard can refer to GB3098.1, while the material of stainless steel carriage bolts is mainly austenitic stainless steel, which owns good heat resistance, good corrosion resistance and good weldability. Austenitic stainless steels include A1, A2. A4 and A2 and A4 stainless steels are commonly used in the market, namely SUS304 and SUS316. Both SUS304 and SUS316 have good ductility and are easy to be cold formed. They are non-magnetic under normal conditions. 304 is slightly magnetic after cold processing, 316 is slightly less magnetic than 304 after cold processing.
Production Process of Carriage Bolts

Specification of Grade 8.8 Carriage Bolt

d | M5 | M6 | M8 | M10 | M12 | M16 | M20 | |
P | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | |
b | L≤125 | 16 | 18 | 22 | 26 | 30 | 38 | 46 |
125<L≤200 | 22 | 24 | 28 | 32 | 36 | 44 | 52 | |
L>200 | - | - | 41 | 45 | 49 | 57 | 65 | |
dk | max | 13.55 | 16.55 | 20.65 | 24.65 | 30.65 | 38.8 | 46.8 |
min | 12.45 | 15.45 | 19.35 | 23.35 | 29.35 | 37.2 | 45.2 | |
ds | max | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
min | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | |
k1 | max | 4.1 | 4.6 | 5.6 | 6.6 | 8.75 | 12.9 | 15.9 |
min | 2.9 | 3.4 | 4.4 | 5.4 | 7.25 | 11.1 | 14.1 | |
k | max | 3.3 | 3.88 | 4.88 | 5.38 | 6.95 | 8.95 | 11.05 |
min | 2.7 | 3.12 | 4.12 | 4.62 | 6.05 | 8.05 | 9.95 | |
r1 | ≈ | 10.7 | 12.6 | 16 | 19.2 | 24.1 | 29.3 | 33.9 |
r2 | max | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 |
r3 | max | 0.75 | 0.9 | 1.2 | 1.5 | 1.8 | 2.4 | 3 |
s | max | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
min | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | |
Common Grade and Coating
Standard | Material | Grade | Finish | Thread |
DIN933 | carbon steel | 4.6 | Plain | UNC |
Zinc plated | ||||
Alloy steel | Yellow zinc plated | |||
PTFE | ||||
Stainless steel | Black Oxide | UNF | ||
Dacromet | ||||
Other | HDG | |||
Other |
Application Area of Grade 8.8 Carriage Bolt
The applications of square neck carriage bolts is not very large. For example, GB12 carriage bolts are similar to DIN603 carriage bolts. They are generally used in grooves. When tightening, the bolt rod will not rotate due to function of the square neck, which is convenient for fixing and installation. The carriage bolt can move in parallel in the slot. Since head of the carriage bolt is round, there is no design of available power tools such as cross grooves or hexagon sockets, and it can also play a role in preventing theft in the actual connection process.
The carriage bolt is used in some special occasions because of its particularity, such as shelves, cabinets and other fields.

Why choose us?
- We work closely with our customers to ensure our Carriage Bolt products meet their exact specifications.
- We focus on making substantial progress in strengthening the support of our main business and cultivating new growth points.
- Our factory has the expertise to provide top-quality Carriage Bolt products that meet your needs.
- We pay more attention to internal quality, and design for customers according to their different needs to meet the needs of customers.
- We offer a range of packaging options for all our Carriage Bolt products to ensure safe and secure shipping.
- We have successfully entered, adapted, mastered, and occupied the market, and then obtained a long, healthy, and rapid development.
- Our Carriage Bolt products are designed to last and withstand heavy use and wear.
- While constantly improving itself, our company has integrated a set of effective market diversification development strategies, and sincerely hopes to expand the market together with our customers, and move towards the direction of specialization, scale and internationalization.
- Our company provides customized Carriage Bolt products to meet unique customer requirements.
- We are committed to making better Grade 8.8 Carriage Bolt to serve consumers since we have standard modern factory buildings, high-quality employees, high-tech talents, and excellent management team with the belief of 'ability, precision, and speed'.
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