This silo bolt is designed for connecting metal sheet structures in bulk material storage facilities such as grain silos, cement tanks, and feed bins. The bolt body is made of carbon steel with a zinc-plated finish to resist corrosion in industrial environments. It features a colorful plastic cap on the head, which prevents dust, moisture, and contaminants from entering the threaded area, reducing the risk of rust and product contamination.
Some models include a rubber washer to enhance sealing performance, making them suitable for applications requiring leak prevention. The caps are available in multiple colors (red, yellow, blue, black), allowing for visual identification and classification during installation or maintenance. The bolt can be used with hex nuts for secure fastening and is reusable after disassembly. Commonly used in prefabricated steel silos, storage hoppers, conveyor systems, and industrial buildings where sheet metal joints require reliable sealing.
|
Material: |
Carbon Steel |
|
Standard: |
drawing or samples |
|
Neck type: |
4 fins |
|
Grade: |
8.8/10.9 |
|
Thread size: |
M12,M16 |
|
Length: |
( 30mm~300mm) |
|
Coating: |
mechanical galvanization, Dacromet |
Hot Products
FAQ
We will respond to your inquiry within 12 hours on weekdays.
We specialize in screws, bolts, and nuts for wooden furniture and home applications.
They are widely used in construction, woodworking, metalworking, and interior installation.
Yes, we can. We develop and produce products based on drawings or samples provided by our customers. Custom Carbon Steel Silo Bolts With Colorful Plastic Cap and Sealing Washer.
More than 80,000 tonnes of fasteners and hardware-related products are exported each year. We are Carbon Steel Grade 8.8/10.9 Silo Bolts Manufacturers in China
We conduct inspections after each process. For finished products, we conduct a comprehensive inspection based on customer requirements and international standards.
About Us
Established in 2004, Jiaxing Sini Fastener Co., Ltd. has over 20 years of experience in the fastener field. We are a well-known leading exporter of bolts and screws. Carbon Steel M12/M16 Silo Bolts Factory in China. Our specialization lies in supplying both standard and custom-engineered bolts and screws.
In addition to manufacturing products that meet DIN and IFI standards, SINI FASTENER also has the capability to produce according to customer-specific designs and drawings. Most items are available in steel and stainless steel, and can be provided in both inch and metric sizes.
• Bolts: Manufactured in diameters from 3/16” to 1 1/2” (5mm–52mm) and lengths from 1/2” to 60” (10mm–1500mm). Our most competitive products include carriage bolts and round head bolts.
• Screws: Produced in diameters from #4 to 1/2” (3.5mm–12mm) and lengths from 1/2” to 60” (10mm–1500mm). Our key advantage lies in corrosion-resistant construction screws.
With production facilities located in Haiyan, Zhejiang and Lianyungang, Jiangsu, we serve customers across North America, South America, and Europe. Our diverse client base spans industries such as construction hardware, machinery, machine tools, electrical appliances, and furniture..
SINI FASTENER is ISO 9001 certified, ensuring consistent quality and reliability.
Certificate
Latest Updates
Industry Knowledge
Jiaxing Sini Fastener Co., Ltd. manufactures the Silo Bolt with Colorful Plastic Cap and Sealing Washer for metal sheet connections in grain silos, cement tanks, feed bins, hoppers and conveyor systems. The bolt body is carbon steel with a zinc-plated finish, and the colorful plastic cap protects the threaded area from dust, moisture and contaminants. Some models include a rubber washer for enhanced sealing. We produce these bolts in Grade 8.8 and 10.9, sizes M12 and M16, with lengths from 30 mm to 300 mm.
As a Silo Bolt with Colorful Plastic Cap and Sealing Washer manufacturer, we supply both standard and custom-engineered fasteners. Our production facilities in Haiyan, Zhejiang and Lianyungang, Jiangsu support annual export volumes exceeding 80,000 tonnes. We are ISO 9001 certified and serve construction hardware, machinery and agricultural equipment customers across North America, South America and Europe.
Our silo bolt range covers the common sheet-metal joint requirements in bulk material storage and handling equipment. The table below summarizes the standard configurations we produce. Custom dimensions, thread lengths and cap colors are available on request.
| Parameter | Standard Options | Notes |
|---|---|---|
| Material | Carbon steel | Stainless steel available on request |
| Grade | 8.8 / 10.9 | Higher grades for higher tensile requirements |
| Thread Size | M12, M16 | Other metric sizes available |
| Length | 30 mm – 300 mm | Custom lengths on request |
| Coating | Mechanical galvanization, Dacromet | Zinc plating standard |
| Neck Type | 4 fins | Provides anti-rotation during tightening |
| Cap Colors | Red, yellow, blue, black | For visual identification and classification |
| Sealing Washer | Rubber washer (some models) | Enhances leak prevention |
Carbon Steel Grade 8.8/10.9 M12/M16 Silo Bolts are used where metal sheets are joined and the joint must resist dust ingress, moisture and product contamination. Typical applications include:
The carbon steel body with zinc plating provides corrosion resistance in industrial environments. The plastic cap covers the head and threaded area, reducing the risk of rust and contamination. When a rubber washer is included, the assembly offers improved sealing for applications requiring leak prevention. The 4-fin neck design helps prevent rotation during installation, which is useful when tightening from one side.
Grade 8.8 and 10.9 bolts are heat-treated to meet tensile and yield requirements. The mechanical galvanization and Dacromet coatings offer different levels of corrosion protection; the choice depends on the service environment and expected exposure. For standard silo construction, M12 and M16 bolts with lengths from 30 mm to 300 mm cover most sheet thickness combinations. We can produce custom lengths and thread sizes to match specific joint designs.
The plastic cap is available in red, yellow, blue and black. Color coding allows installation teams to identify bolt types or inspection status during assembly and maintenance. The caps are designed to remain in place after installation and can be removed for reuse of the bolt after disassembly.
We conduct inspections after each production process. For finished Carbon Steel Silo Bolts, we perform comprehensive inspection based on customer requirements and international standards. Our quality control equipment includes salt spray test chambers, universal testing machines, hardness testers, video measuring systems, metallographic microscopes, tensile testing machines and optical emission spectrometers. These allow us to verify coating thickness, mechanical properties, dimensions and material composition.
SINI FASTENER is ISO 9001 certified. We can provide inspection certificates and test reports as agreed in the order. For project orders, we work with customers to define acceptance criteria and sampling plans before production begins.
Grade 8.8/10.9 Silo Bolts are installed with hex nuts. The 4-fin neck engages the sheet metal to resist rotation, allowing tightening from the nut side. The plastic cap is pressed onto the bolt head after installation. When a rubber washer is used, it sits under the head or under the nut to seal the joint. We recommend using a torque wrench and following the project's specified torque values to avoid over-tightening or under-tightening.
For maintenance, the bolts can be reused after disassembly if the threads and coating are not damaged. Replacement caps and washers are available. Visual inspection of cap condition and coating integrity helps identify joints that may need attention.
Our product range includes other bolts and fasteners used in silo and sheet metal construction:
We also manufacture Nuts and Washers to complete the assembly.
To prepare a proposal for silo bolts, we need the following project details:
Drawings or samples are welcome for custom configurations. We develop and produce products based on customer-specific designs.
Q: What sizes of silo bolts do you manufacture?
A: We produce M12 and M16 silo bolts with lengths from 30 mm to 300 mm. Custom sizes are available based on drawings or samples.
Q: What materials and grades are available?
A: The standard material is carbon steel in Grade 8.8 or 10.9. Stainless steel is available on request. Coatings include mechanical galvanization, Dacromet and zinc plating.
Q: Can the plastic caps be supplied in specific colors?
A: Yes. We offer red, yellow, blue and black caps as standard. Other colors can be discussed for volume orders.
Q: Do you provide sealing washers with the bolts?
A: Some models include a rubber washer for enhanced sealing. We can supply bolts with or without washers according to your requirements.
Q: What is the lead time for a typical order?
A: Lead time depends on quantity, configuration and current production schedule. We confirm lead time when preparing the quotation.
Q: Can you produce silo bolts to our drawings?
A: Yes. We develop and produce custom fasteners based on customer drawings or samples. Please provide detailed specifications for evaluation.
Copyright © Jiaxing Sini Fastener Co., Ltd.
All Rights Reserved.
Custom Carbon Steel Grade 8.8/10.9 M12/M16 Silo Bolts Factory
English
Español
