Black Knurled Neck Hex Bolt Overview

Black Knurled Neck Hex Bolt is a special bolt with a hexagonal head and knurled pattern near the head area of the shank. Its surface is blackened and has good rust and wear resistance. This bolt provides additional anti-rotation performance in some mechanical connections due to its knurled design and is widely used in mechanical manufacturing and high-precision connection requirements.

Black Knurled Neck Hex Bolt is a hexagonal head fastener with a knurled pattern (usually straight or cross) on the shank below the head. The main function of the knurled part is to enhance friction and prevent the bolt from loosening or rotating during installation or use.

• Hexagonal head: It is easy to tighten and remove with tools such as wrenches.
• Knurled neck: The shank under the hexagonal head is knurled to provide better anti-slip and positioning effects.
• Blackening treatment: Through chemical oxidation or heat treatment, the surface appears black or dark gray, improving corrosion resistance and wear resistance.

Application of Black Knurled Neck Hexagon Bolts

Black knurled neck hexagonal bolts are mainly used in the following fields:

• Mechanical equipment: especially the fastening of parts that need to prevent rotation, such as mechanical sliders and transmission devices.
• Automobile manufacturing: used for non-rotating connections in automobile chassis parts or interiors.
• Construction: suitable for fixing in steel structures to avoid bolt sliding under large loads.
• Household appliances: used for assembly parts that require high-precision positioning or anti-slip of the connecting parts.
• Railway and rail transportation: used for the connection of sleepers or rail equipment.

Features of Black Knurled Neck Hexagon Bolts

Advantages

• High anti-rotation performance: The knurled neck provides reliable anti-slip and anti-rotation capabilities.
• Easy installation: no additional auxiliary measures are required to achieve a stable effect.
• Economical efficiency: Compared with other anti-loosening solutions (such as adding washers or using anti-loosening glue), it is cheaper.
• Wear resistance: The wear resistance of the bolt surface is improved after blackening treatment.

Disadvantages

• Limited corrosion resistance: Compared with hot-dip galvanizing or stainless steel treatment, the blackened surface has a weaker anti-rust effect in a humid or acidic environment.
• Complex processing of the knurled part: The knurling process increases production costs and processing time.