Industrial Stainless Steel & Custom Screws Manufacturer
Ningbo Teng Qi Fasteners Co.,Ltd is a professional industrial screws manufacturer with an ISO9001 certified quality management system, specializing in the production of high-quality screws for global industrial applications. We manufacture a wide range of screws using various materials, including stainless steel 304, stainless steel 316, carbon steel, brass and aluminum. Our products can be produced according to international standards such as ISO, DIN and ASME/ANSI, as well as customized according to customers’ drawings, samples and specific requirements.
With advanced manufacturing equipment and experienced engineers, we are capable of producing standard and precision screws through processes including cold heading, thread rolling, CNC machining, turning, milling and drilling. Our strict quality control system includes thread inspection with go/no-go gauges, dimensional accuracy inspection, material strength testing and surface coating thickness verification. Our screws are widely exported to Europe, North America and other international markets, providing reliable fastening solutions for customers worldwide.
Types of screw
Industrial screws are mechanical fasteners designed to securely join and assemble different components in industrial applications. Unlike bolts that are usually used together with nuts, screws typically create fastening connections by engaging directly with threaded holes or materials. They are widely used in machinery, automotive, construction, electronics, electrical equipment and other industries where reliable and precise fastening is required.
Industrial screws are available in various designs, materials and specifications to meet different application requirements. Common types include machine screws, self-tapping screws, socket screws, drilling screws and customized precision screws. Depending on the working environment, screws can be manufactured from stainless steel 304, stainless steel 316, carbon steel, brass, aluminum and other materials, with different surface treatments available to improve corrosion resistance, durability and performance.
Material option for screws:
We provide a wide range of material options for industrial screws to meet different application requirements. Our manufacturing capabilities include cold heading and precision machining of various metals, such as stainless steel, carbon steel, brass and aluminum. With advanced production equipment and experienced technicians, we are able to manufacture screws with excellent dimensional accuracy, reliable mechanical performance and consistent quality.
Stainless steel screws, including SS304 and SS316, are widely used for applications requiring excellent corrosion resistance and durability. Carbon steel screws are suitable for applications requiring high strength and cost efficiency, while brass and aluminum screws are ideal for applications requiring electrical conductivity, lightweight properties or special performance requirements. We can manufacture standard and custom screws according to customer drawings, samples and technical specifications.
| Material | Main Fertures | Typical Application |
|---|---|---|
| Stainless Steel 304 | Excellent corrosion resistance, good strength, good formability and weldability. Widely available and cost-effective compared with higher grade stainless steel. Suitable for general industrial environments. | Machinery, automotive parts, construction, electrical equipment, general industrial fastening |
| Stainless Steel 316 | Superior corrosion resistance due to molybdenum content. Excellent resistance to salt water, chemicals and harsh environments. Provides long service life in demanding applications. | Marine equipment, chemical industry, food processing equipment, outdoor structures |
| Carbon Steel | High mechanical strength, excellent hardness and wear resistance. Suitable for applications requiring high load capacity. Can be supplied with different surface treatments for improved corrosion protection. | Heavy machinery, automotive components, construction equipment, industrial assemblies |
| Brass | Excellent electrical conductivity, good corrosion resistance and attractive appearance. Non-magnetic material with good machining performance. | Electrical equipment, electronic components, precision instruments, decorative applications |
| Aluminum | Lightweight, corrosion resistant and non-magnetic. Provides good machinability and high strength-to-weight ratio. Suitable for weight-sensitive applications. | Aerospace components, electronics, lightweight structures, automotive applications |
| Alloy Steel | High strength, high hardness and excellent fatigue resistance. Suitable for applications requiring superior mechanical performance under heavy loads. | Automotive, industrial machinery, high-strength fastening applications |
Industrial Screw Manufacturing Process:
1. Raw Material Preparation
We carefully select suitable raw materials according to screw requirements, including stainless steel, carbon steel, brass and aluminum. Material inspection is performed before production to ensure chemical composition and mechanical properties meet customer specifications.
2. Cold Heading Process
Cold heading is one of our main screw manufacturing processes. Using advanced cold heading machines, we can efficiently form screw heads and basic shapes with high production efficiency and consistent quality, especially for high-volume standard screws
3. Thread Rolling
Thread rolling is used to produce strong and precise screw threads without cutting away material. This process improves thread strength, surface finish and production efficiency, ensuring reliable fastening performance.
4. CNC Machining and Precision Processing
For customized screws and precision components, we use CNC machining, turning, milling and drilling processes to achieve complex designs, special dimensions and tight tolerances according to customer drawings.
5. Surface Treatment
We provide various surface treatment options to improve corrosion resistance, durability and appearance, including zinc plating, black oxide, passivation and other customized finishes.
6. Inspection and Quality Control
During and after production, screws are inspected through dimensional measurement, thread gauge testing, material testing and surface coating thickness inspection to ensure compliance with customer requirements.
Quality Control of Screws:
Quality is strictly controlled throughout our entire screw manufacturing process. With an ISO9001 certified quality management system, we perform comprehensive inspections from raw material selection to final shipment. Our quality control procedures include material verification, dimensional inspection, thread inspection with go/no-go gauges, mechanical performance testing and surface treatment inspection to ensure every screw meets customer requirements and international standards.
Equipped with professional inspection equipment and experienced quality control personnel, we are committed to providing reliable and consistent screw products for global customers. We carefully control critical parameters such as thread accuracy, dimensional tolerances, material strength and coating thickness. Whether producing standard screws or customized precision screws, we ensure stable quality and dependable performance for various industrial applications.
| Inspection Item | QUality Control Method |
|---|---|
| Material Inspection | We inspect raw materials before production to ensure the material grade, chemical composition and mechanical properties meet customer requirements. Materials such as stainless steel 304, stainless steel 316, carbon steel, brass and aluminum are carefully controlled to ensure consistent product performance. |
| Dimensional Inspection | We perform dimensional inspections throughout the manufacturing process to ensure screws meet drawing specifications and international standards. Critical dimensions including screw length, diameter, head dimensions and tolerances are carefully checked. |
| Thread Inspection | Thread quality is essential for reliable fastening performance. We use thread plug gauges and ring gauges to inspect screw threads, ensuring accurate pitch, thread profile and proper fitting performance. |
| Mechanical Property Testing | We conduct mechanical testing to verify the strength and durability of screws. Testing methods may include hardness testing, tensile strength testing and other mechanical performance evaluations according to product requirements. |
| Surface Treatment Inspection | Surface treatment quality is inspected to ensure corrosion resistance and appearance requirements. We check coating thickness and surface condition for different finishes, including zinc plating, black oxide, passivation and customized coatings. |
| Final Inspection Before Shipment | Before shipment, finished screws undergo final inspection to verify dimensions, appearance, quantity and packaging requirements. Only products meeting customer specifications are approved for delivery. |
Standard of Screws we produce
ASME/ANSI American Standard:
ASME/ANSI B18.3 Hexagon Socket Head Cap Screws ANSI/ASME B18.3 Hexagon Socket Button Head Cap Screws ANSI/ASME B18.3F Hex Socket Countersunk Head Machine Screw ASME/ANSI B18.3 Countersunk Head Torx Screw ASME/ANSI B18.6.3 Cross Recessed Pan Head Machine Screws DIN32501 Studs for Stud Welding with Tip Ignition
GB Chinese Standard:
GB831 Slotted Shoulder Screws Stainless Steel GB834 Knurled Thumb Screws GB835 Knurled Screws GB836Knurled Screws with Small Head GB837 Slotted Pan Head Screws with Waisted Shank GB830 Slotted Cheese Head Screws with Shoulder Nickel Plated Furniture Shelf Peg with Matching Knurled Nut Nickel Plated Smooth Shank Single Shoulder Shelf Support Screw
DIN Germany Standard:
DIN7500EE Hexagon Cheese Head Thread Rolling Steel Screws DIN7505 Particle Board Countersunk Head Screws with Cross Recess DIN7964E Stainless Steel Socket Head Cap Captive Screws DIN7971 Slotted Pan Head Tapping Screws DIN7972 Slotted Countersunk Head Tapping Screws DIN7973 Slotted Raised Countersunk Head Tapping Screws ISO1207 Slotted Cheese Head Screws DIN7981 Cross Recessed Pan Head Tapping Screws DIN7984 Hexagon Socket Head Cap Screws with Low Head DIN7991 Hex Socket Countersunk Head Cap Screws DIN84 Steel Slotted Cheese Head Screws
DIN913 Hexagon Socket Set Screw DIN914 Hexagon Socket Set Screws With Cone Point DIN915 Dog Point Hexagon Socket Set Screws DIN916 Cup Point Hexagon Socket Set Screws DIN963 90° Slotted Countersunk Head Screws DIN965 Cross Recessed Countersunk Head Screws DIN968 Cross Recessed Pan Head Tapping Screws with Collar ISO14581 Hexalobular Socket Countersunk Flat Head Screws DIN251 Hexagon Socket Head with Serrated Flange Screws DIN316 Wing Screws DIN6912 Thin Head Socket Cap Screws with Pilot Recess DIN6928 Hexagon Washer Head Tapping Screws DIN7500PE Torx Pan Head Thread Rolling Screws DIN7976 Hexagon Head Tapping Screws DIN7982 Cross Recessed Countersunk Head Tapping Screws DIN7983 Cross Recessed Raised Countersunk Head Tapping Screws DIN7985 Cross Recessed Raised Cheese Head Screws DIN964 Slotted Raised Countersunk Head Screws DIN966 Cross Recessed Raised Countersunk Head Screws DIN967 Cross Recessed Pan Head Screws with Collar
ISO Inernational Standard:
ISO1207 Slotted Cheese Head Screws ISO10642 Socket Cap Countersunk Head Screws ISO14579 Hexalobular Socket Head Cap Screws ISO14580 Hexalobular Socket Cheese Head Screws ISO14583 Hexalobular Socket Pan Head Screws ISO14584 Torx Raised Countersunk Head Screws ISO14585 Torx Pan Head Self Tapping Screws ISO7380 Hexagon Socket Button Head Screws