Product Details
SS304 Grade A2-70 Corrosion Resistance Self-Clinching Screw
1.Products Details:
Passivated clinch bolts are specialized fasteners designed for
permanent or semi-permanent joining of materials, typically metals,
through a cold-forming process called "clinching." Unlike
traditional threaded bolts that rely on nuts or tapped holes,
clinch bolts create a secure connection by deforming the base
material around the bolt’s shank, forming a tight,
vibration-resistant bond.
The "passivated" feature refers to a surface treatment process
(usually using nitric acid or citric acid) that removes free iron
and other contaminants from the bolt’s surface, forming a
protective oxide layer. This treatment enhances corrosion
resistance, making the bolts suitable for use in harsh environments
where exposure to moisture, chemicals, or atmospheric elements is
common.
2.Key Features:
Superior Corrosion Resistance
The passivation process forms a thin, inert oxide layer on the
bolt’s surface, preventing rust and degradation caused by
environmental factors. This makes them ideal for outdoor
applications, automotive underbodies, or industrial equipment
exposed to humidity.
High-Strength, Permanent Connections
Clinching creates a mechanical interlock between the bolt and the
base material (e.g., sheet metal), eliminating the need for
additional fasteners like nuts or welds. The resulting joint is
resistant to loosening from vibrations, ensuring long-term
stability.
Cost-Effective and Efficient Installation
Installation requires minimal tools (typically a press or clinching
machine) and no pre-drilled or tapped holes, reducing production
time and labor costs. The process is also clean, producing no fumes
or debris compared to welding.
Versatility in Material Compatibility
They work with a wide range of materials, including steel,
aluminum, and other non-ferrous metals, as well as composite
materials. This versatility makes them suitable for industries such
as automotive, aerospace, electronics, and construction.
Aesthetic and Dimensional Consistency
Passivation leaves a uniform, clean surface finish, avoiding the
discoloration or irregularities that may occur with other
treatments like painting or plating. Additionally, the clinching
process ensures consistent joint dimensions, maintaining part
accuracy.
No Damage to Base Materials
The cold-forming clinching process does not generate heat,
preventing material distortion, weakening, or metallurgical changes
in the base material—critical for thin or heat-sensitive
components.
3.Technical Parameters
d | 2# | 4# | 6# | 8# | 10# | 10# | 1/4 | 5/16 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 |
P | / | / | / | / | / | / | / | / | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 |
PP | 56 | 40 | 32 | 32 | 24 | 32 | 20 | 18 | / | / | / | / | / | / | / |
dk | Nominal | 0.144 | 0.176 | 0.206 | 0.237 | 0.256 | 0.256 | 0.337 | 0.376 | 4.1 | 4.6 | 5.3 | 5.9 | 6.5 | 8.2 | 9.6 |
MAX | 0.159 | 0.191 | 0.221 | 0.252 | 0.271 | 0.271 | 0.352 | 0.391 | 4.5 | 5 | 5.7 | 6.3 | 6.9 | 8.6 | 10 |
MIN | 0.129 | 0.161 | 0.191 | 0.222 | 0.241 | 0.241 | 0.322 | 0.361 | 3.7 | 4.2 | 4.9 | 5.5 | 6.1 | 7.8 | 9.2 |
s | MAX | 0.075 | 0.085 | 0.09 | 0.09 | 0.1 | 0.1 | 0.135 | 0.16 | 1.95 | 2.1 | 2.25 | 2.4 | 2.7 | 3 | 3.7 |
Certificate Display
Production Process
Packaging and shipping Details
Company Profile
Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in
Ningbo, the second largest port city in China. The factory is 50
kilometers away from Ningbo Port and can reach the sea freight
warehouse in one hour, with very fast logistics. The company was
founded in 2012 and after years of hard work and development, it
has become a factory covering an area of over 2000 square meters
with a registered capital of 6.8 million yuan. So far, the company
has two holding subsidiaries and has gradually developed into a
medium-sized fastener manufacturing enterprise integrating research
and development, production, and sales. Currently, the factory has
more than 50 employees and complete production and testing
equipment, including more than 50 production equipment and more
than 10 testing equipment. The factory has an annual production
capacity of 4000-5000 tons of fasteners and an annual output value
of 40-50 million RMB. Our products have a normal delivery time of
20-30 days and a stock time of 1-5 days. Our independent brand "YB"
accepts OEM, ODM. Our main products include various fasteners,
standard parts, bolts, screws, wood screws, self tapping screws,
turning screws, combination screws, nuts, accessories, flat
washers, lifting rings, etc. In addition, we also have multiple CNC
lathes and milling machines to provide customized fastener services
for customers. The company's products are mainly used in the fields
of automobiles, machinery, electronic equipment, sheet metal,
security, new energy, etc., and have been widely praised by
domestic and foreign customers. Welcome new and old customers to
inquire.