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Black Bolt Manufacturer In China

Ningbo Teng Qi Fasteners Co., Ltd is a leading black bolt manufacturer in China. A “black bolt” typically refers to a standard steel bolt that has not undergone any specific surface treatment or coating to protect it from corrosion. In other words, it is an untreated or uncoated steel bolt. The term “black” in this context does not refer to the color but rather indicates the absence of any protective finish.

Black bolts are made of plain carbon steel and are susceptible to rust and corrosion when exposed to moisture and other corrosive elements. They are often used in indoor applications or situations where corrosion resistance is not a primary concern. If used outdoors or in environments prone to moisture, they may rust over time.

To enhance corrosion resistance, steel bolts are often coated with various materials, such as zinc plating, hot-dip galvanization, or other protective coatings. These coatings help prevent rust and extend the lifespan of the bolt, making them more suitable for outdoor or corrosive environments.

black bolt manufacturer

Specification of Black Bolt:

The specification of a black bolt typically includes several important parameters and details that define its size, type, and characteristics. Here are some of the key specifications commonly used to describe black bolts:

Product nameBlack Bolts
Size and Length:Metric: M0.8-M100
Imperial:0# to 4"
Thread Type and Pitch:Metric: Up to 800mm
Imperial: Up to 30"
Material:carbon steel, alloy steel
Strength Grade:Metric: 400MPA/800MPA/1000MPA/1200MPA
Imperial: 125ksi/175ksi
Head Type:Hex head/flange head/square head/heavy hex head/round head
Finish and Coating:Plain
Industry Standards:ISO/ASTM/ASME/DIN/UNI/JIS
Packaging:Boxes/cartons into wooden pallets
Application:Construction/Agricultural Machinery/Industrial Structures/Equipment and Machinery/Infrastructure

FAQ about Black Bolt:

1.What is a black bolt?

A black bolt is an untreated or uncoated steel bolt that lacks a specific surface finish or protective coating against corrosion.

2.When are black bolts typically used?

Black bolts are commonly used in indoor applications or situations where corrosion resistance is not a primary concern. They are often utilized in structural or industrial settings.

3.Do black bolts rust?

Yes, black bolts are susceptible to rust when exposed to moisture and corrosive elements over time. They lack the protective coating that prevents rust.

4.Can black bolts be used outdoors?

While black bolts can be used outdoors, they are more prone to corrosion in outdoor environments. If used outdoors, regular maintenance and rust prevention measures may be necessary.