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Your Professional Steel Structures Bolts Manufacturer

Wuxi Lemar Metal Products Co., Ltd. is a professional fastener system service group integrating scientific research, manufacturing, sales and logistics. It follows the business philosophy of "striving for excellence and adhering to integrity" and has established a good image in the field of fastener manufacturing and sales. It has established long-term cooperative relationships with major well-known logistics brands at home and abroad to ensure that products are delivered to customers at the fastest speed and are well received by users.

High Strength Torsion Shear Bolt
Product name: High strength Torsion Shear Bolt. Grade:10.9/12.9. Material:Carbon steel. Size:5/8”~1-1/2”.
Steel Structure Hex Bolts
Product name: Steel structure hex bolts. Material:Carbon steel. Grade：8.8/10.9/12.9 grade. Set:Hexagonal head and flange and screw.
High Strength T.C. Bolts
Product name: High strength T.C. bolts. Acceptance: OEM/ODM, Trade, Wholesale, Regional Agency. Payment: T/T, L/C, PayPal. Grade:10.9 grade/ASTM A325.
Steel Structure Torsion Shear Bolt
Name:Steel Structure Torsion Shear Bolt. Bolt type:Large Size Hex bolt. Other name:Torsion shear bolt. Strength Grade:8.8S,10.9S,12.9S.
High Strength Tension Control Bolts
Product name: High strength Tension control bolts. Surface treatment: Oxidation and blackening. Color:Black/Zinc coated. Product features: wear-resistant.

Why Choose Us

Technical team support
Possess full process manufacturing capabilities and experimental research and development capabilities for fasteners. With strong technical strength and 3D marketing network, it has more than 100,000 enterprise-level users and serves 57 industries.

Production Equipment
Our company has cold heading machines, thread rolling machines, wire drawing machines, thread rolling machines, tapping machines, vibration plate automatic assembly and other processing and feeding equipment.

Sales Market
Lemar Assisting scientific research enterprises,exported to Europe,North America, Africa, Central Asia, Middle East.

Steel Structures Bolts - Overview

Steel structure bolts are high-strength fasteners specifically designed to connect steel components in structures like buildings, bridges, and towers. They are crucial for maintaining the structural integrity and stability of these systems, particularly in applications involving heavy loads and dynamic forces.

Product Specification

We provide the following product specifications：

D		M16	M20	M22	M24	M27	M30
P		2	2.5	2.5	3	3	3.5
Da	max	18.83	24.4	26.4	28.4	32.84	35.84
Ds	max	16.43	20.52	22.52	24.52	27.84	30.84
Ds	min	15.57	19.48	21.48	23.48	26.16	29.16
Dw	min	27.9	34.5	38.5	41.5	42.8	46.5
Dk	max	30	37	41	44	50	55
k'	Nominal	10	13	14	15	17	19
	max	10.75	13.9	14.9	15.9	17.9	20.05
	min	9.25	12.1	13.1	14.1	16.1	17.95
k'	min	12	14	15	16	17	18
k''	max	17	19	21	23	24	25
R	min	1.2	1.2	1.2	1.6	2	2
db	max	11.3	14.1	15.6	16.9	19.3	21.4
db	min	11	13.8	15.3	16.6	18.7	20.8
dc ≈		12.8	16.1	17.8	19.3	21.9	24.4
de ≈		13	17	18	20	22	24

Advantages of Steel Structures Bolts

Ease of Assembly

Bolted connections can be quickly and easily assembled and disassembled, making them ideal for structures that may require maintenance or modification.

High Strength

Bolts can provide strong connections that can support significant loads, making them suitable for a variety of applications, including bridges and buildings.

Adjustability

Bolted connections allow for adjustments during assembly, which can be beneficial for alignment and ensuring proper fit.

Reliability

When installed correctly, bolted connections are reliable and can maintain their integrity over time under various loads and environmental conditions.

Versatility

They can be used in a wide range of materials, including steel, wood, and concrete, making them adaptable to different engineering needs.

Application of Steel Structure Bolts

Building Structure

In steel structure buildings, bolts are used to connect beams to columns, nodes and supports. Bolted connections are not only quick to install, but also easy to adjust and maintain, and can effectively ensure structural stability.

Bridges

In bridge engineering, bolts are used to connect main beams, cross beams and bridge decks. They provide high load-bearing capacity and good vibration resistance, ensuring the safety of bridges in long-term use.

Industrial Facilities

In the installation of heavy machinery, equipment supports and pipe supports, bolts can adapt to high strength and dynamic loads to ensure the stable operation of industrial facilities.

Temporary Structures

Bolts are widely used in temporary supports, scaffolding and temporary bridges. Because they are easy to disassemble and reuse, they greatly facilitate the rapid construction and disassembly of construction sites.

Material of Steel Structures Bolts

Bolts are made of different grades of steel. The bolt grade determines the maximum amount of stress the bolt can handle. Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is dependent upon the bolt grade. The grades are indicated on top of the bolts. They show up as raised numbers or dashes. There are three main systems of bolt classification: SAE, Metric and ASTM.

★SAE Bolt Grades: The standards for bolt strength grades in the U.S. They are set according to a system developed by the SAE. SAE stands for Society of Automotive Engineers. The SAE marking system uses raised dashes on the bolt head. The dashes are used to indicate strength.

★Metric Bolt Grades: Set according to rules set by the ISO. ISO stands for International Standards Organization. The grades consist of two numbers separated by a dot. The property class is expressed in raised or depressed numerals. The numerals are on top or on the side of the bolt head.

★ASTM Bolt Grades: Set by the American Society for Testing and Materials. Its strength grades are indicated by the letter A. There are also three numerals stamped on the bolt head.

Installation and Tightening of Steel Structure Bolts

Torque method: Use a torque wrench to control the preload of the bolts, which is suitable for most standard bolts. This method is simple and reliable, and can accurately control the tightening force.

Angle method: Control the preload by the rotation angle, which is usually used in uneven loads or special circumstances to ensure uniform connection tightening.

Tension control method: Use torsion shear bolts (TC bolts) to accurately control the preload by twisting off the tail, which is suitable for connections with high strength requirements.

Preload is the key to ensuring the stability and anti-slip performance of bolt connections: Controlling the appropriate preload can effectively prevent the bolts from loosening and ensure the reliability of the connection. The arrangement of the bolts should also be adapted to the load type to ensure the stability of the connection.

Customization Process

Requirement Discussion

Design Proposal

Our professional team will develop a design proposal and provide a quotation based on your requirements.

Sample Production

We produce samples according to the design proposal and conduct rigorous testing.

Mass Production

Upon your approval, we commence mass production to ensure timely delivery and consistent quality.

After-Sales Service

We offer ongoing technical support and service to ensure the long-term stable operation of our products.

Other Services

Surface treatment: Plain, Galvanized, Hot Dip Galvanized, Black Oxide, Anodized, etc.
Excellent quality control system for fine dimensional accuracy.
Various materials are available as per your request
Conform to international standard.
We had got certificate of ISO9001: 2008, SGS & RoHS.
Prompt delivery.
Various sizes are available.
Material: Stainless Steel 18-8 18-10, Carbon steel Gr4.8 Gr8.8 Gr10.9, Gr12.9, Aluminum, Copper, etc.
Packing Stylet: General export packing
Can be made with different standards such as ISO, DIN, AS/NZS, GB, ANSI, BS and special standard.
Good customer service
OEM is available

Package & Delivery

Package:	Standard export package
Delivery:	By air express, by sea

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FAQ

Q: What are the pros and cons of welding vs bolting in steel structures?

A: Bolted connections are easy to modify or disassemble, making them more suitable for projects that require frequent adjustments. The permanence of welded connections makes modifications more challenging, potentially leading to higher costs if alterations are needed.

Q: What is the main function of bolted connections in steel structures?

A: In steel structure, bolt connections are a component that plays an extremely important role. The use of bolt connections is to connect, assemble and link parts into block systems and truss frames. Bolts clamp the parts together according to the principle of friction between the nut and the threaded rings of the bolt.

Q: What are the grades of structural steel bolts?

A: There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used, the higher number means the stronger the bolt.

Q: Are you manufacturer or trading company?

A: We are manufacturer.

Q: What's your best delivery time?

A: Within 15-30 days.

Q: What is the quality control of your product?

A: Follow strictly quality control measures for implementation,

Q: Will your company provide free sample?

A: It depends on which sort of item you want to get. Some can be provided free of charge, however, the client shall assume the shipping fees himself.

Q: Is OEM open to clients?

A: Yes, we can provide both OEM and ODM service.

Q: How can our company be your distribution partner?

A: We welcome you to be our distributor. For further details, please contact us.

Q: What is the payment of sample?

A: T/T and Alipay both acceptable.

Q: What is your sample policy?

A: If we have stock, we can provide samples, but the customer must pay the sample fee and express fee Question.

Q: Have you tested all your goods before shipment?

A: Yes, we will conduct 100% test before delivery, and we will send detailed photos of parts for your approval Question.

We're well-known as one of the leading steel structures bolts manufacturers and suppliers in China. If you're going to wholesale high quality steel structures bolts made in China, welcome to get pricelist and free sample from our factory. Also, OEM service is available.

Steel Structure Torsion Shear Bolt, High Strength T C Bolts, High Strength Tension Control Bolts

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