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DIN931
HINA
HINA2024112803
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.
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.
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.
Haina is committed to providing customers with high-quality stainless steel standard fasteners and professional services to meet various engineering needs. We have a large amount of spot inventory to ensure fast delivery and save you waiting time. In addition, we provide the following value-added services to help your purchasing experience:
1. Free samples: provide samples for customer testing.
2. 3.1 Test report: quality test report that meets international standards.
3. Video factory inspection: support video factory inspection to demonstrate production process and quality management.
Advantages
- Sufficient inventory: quick response to order requirements.
- Quality assurance: strict quality control to ensure product reliability.
Haina is committed to providing efficient and high-quality fastener services.
1.How are blackened hexagonal bolts made?
There are mainly the following manufacturing processes for blackened hexagonal bolts. Low-temperature blackening process, the blackened film of the treated workpiece is firm and has good bonding force. It is dark after oil sealing and has certain wear resistance, which meets the national standard GB/T15519; high-temperature blackening has a very good effect, has good corrosion resistance and wear resistance, and the blackened film has very strong bonding force. The surface of the treated workpiece has wear resistance, friction reduction, anti-scratch, anti-seizure, anti-fatigue, corrosion resistance and self-lubricating properties; the optical matte blackening process is treated by a special method to make the workpiece obtain a matte, non-reflective black oxide film. The blackened film has strong bonding force, firmness, no dust, and good wear resistance
2.When to use galvanized bolts?
Use galvanized bolts in outdoor, humid, or corrosive environments where strong rust and weather protection are needed, such as in construction, bridges, or marine applications.
3.What are the advantages and disadvantages of blackened hexagonal bolts compared with galvanized bolts?
The advantage is that the cost is relatively low, the blackening process is relatively simple, and the cost is lower than that of galvanizing. Moreover, the surface hardness of the bolts after blackening is relatively high, and they have certain wear resistance. The disadvantage is that the rust resistance is not as good as that of galvanized bolts, especially in some harsh outdoor environments or high humidity environments, galvanized bolts have better rust resistance and longer service life
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.
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.
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.
Haina is committed to providing customers with high-quality stainless steel standard fasteners and professional services to meet various engineering needs. We have a large amount of spot inventory to ensure fast delivery and save you waiting time. In addition, we provide the following value-added services to help your purchasing experience:
1. Free samples: provide samples for customer testing.
2. 3.1 Test report: quality test report that meets international standards.
3. Video factory inspection: support video factory inspection to demonstrate production process and quality management.
Advantages
- Sufficient inventory: quick response to order requirements.
- Quality assurance: strict quality control to ensure product reliability.
Haina is committed to providing efficient and high-quality fastener services.
1.How are blackened hexagonal bolts made?
There are mainly the following manufacturing processes for blackened hexagonal bolts. Low-temperature blackening process, the blackened film of the treated workpiece is firm and has good bonding force. It is dark after oil sealing and has certain wear resistance, which meets the national standard GB/T15519; high-temperature blackening has a very good effect, has good corrosion resistance and wear resistance, and the blackened film has very strong bonding force. The surface of the treated workpiece has wear resistance, friction reduction, anti-scratch, anti-seizure, anti-fatigue, corrosion resistance and self-lubricating properties; the optical matte blackening process is treated by a special method to make the workpiece obtain a matte, non-reflective black oxide film. The blackened film has strong bonding force, firmness, no dust, and good wear resistance
2.When to use galvanized bolts?
Use galvanized bolts in outdoor, humid, or corrosive environments where strong rust and weather protection are needed, such as in construction, bridges, or marine applications.
3.What are the advantages and disadvantages of blackened hexagonal bolts compared with galvanized bolts?
The advantage is that the cost is relatively low, the blackening process is relatively simple, and the cost is lower than that of galvanizing. Moreover, the surface hardness of the bolts after blackening is relatively high, and they have certain wear resistance. The disadvantage is that the rust resistance is not as good as that of galvanized bolts, especially in some harsh outdoor environments or high humidity environments, galvanized bolts have better rust resistance and longer service life
