Stainless Steel GB839 Knurled Thumb Screws with Waisted Shank Supplier In China
Ningbo Teng Qi Fasteners Co., Ltd. is a professional and reliable supplier of Stainless Steel GB839 Knurled Thumb Screws with Waisted Shank, offering customized fastening solutions for customers in different industries. With years of experience in stainless steel fastener manufacturing, we have the capability to produce screws with precise dimensions, excellent surface finish, and stable performance according to GB839 standards or customer drawings. The knurled head design allows for easy hand tightening and removal without the need for additional tools, while the waisted shank structure provides improved flexibility and stress relief during assembly.
At our factory, we combine advanced cold forming, machining, thread processing, and strict quality inspection processes to ensure every Stainless Steel GB839 Knurled Thumb Screw with Waisted Shank meets high-quality requirements. Manufactured from premium stainless steel materials such as SUS304 and SUS316, our screws deliver outstanding corrosion resistance, durability, and long service life even in demanding environments. We are committed to providing reliable products, competitive solutions, and professional support to help customers achieve efficient and secure fastening in their applications.
Specification:
The specification of GB839 Knurled Thumb Screws with Waisted Shank defines the requirements for their dimensions, materials, thread types, head design, and manufacturing tolerances. These screws are designed with a knurled head for convenient manual operation, allowing users to tighten or loosen the screws quickly without tools. The waisted shank design provides additional flexibility and helps reduce stress concentration, making them suitable for applications where frequent assembly and disassembly are required. They are available in various sizes, thread diameters, and lengths to meet different fastening needs.
| Product name | Stainless Steel GB839 Knurled Thumb Captive Screws with Waisted Shank |
|---|---|
| Thread Diameter: | M3-M10 |
| Material: | SS304 SS316 |
| Surface Treatment | Bright Pickling/Plain/Nylon Patch |
| Packaging: | Boxes/cartons into wooden pallets |
Dimension Chart of Stainless Steel GB839 Knurled Thumb Screws with Waisted Shank:
| Mon | M3 | M4 | M5 | M6 | M8 | M10 |
| P | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| ds max | 2 | 2.8 | 3.5 | 4.5 | 5.5 | 7 |
| ds min | 1.86 | 2.66 | 3.32 | 4.32 | 5.32 | 6.78 |
| dk max | 5 | 8 | 9 | 11 | 14 | 17 |
| dk min | 4.82 | 7.78 | 8.78 | 10.73 | 13.73 | 16.73 |
| k max | 4.5 | 6.5 | 7 | 10 | 12 | 13.5 |
| k min | 4.32 | 6.32 | 6.78 | 9.64 | 11.57 | 13.07 |
| n min | 0.86 | 1.26 | 1.28 | 1.66 | 2.06 | 2.56 |
| n max | 1 | 1.51 | 1.51 | 1.91 | 2.31 | 2.81 |
| t min | 0.7 | 1 | 1.2 | 1.4 | 1.9 | 2.4 |
| r min | 0.1 | 0.2 | 1.2 | 1.4 | 1.9 | 2.4 |
| k1 | 1 | 1.5 | 1.5 | 2 | 2.5 | 2.5 |
- RELATED SCREWS LISTS:
- Stainless Steel DIN7976 Hexagon Head Tapping Screws
- Stainless Steel DIN7982 Cross Recessed Countersunk Head Tapping Screws
- Stainless Steel DIN7983 Cross Recessed Raised Countersunk Head Tapping Screws
- Stainless Steel DIN7985 Cross Recessed Raised Cheese Head Screws
- DIN7964E Stainless Steel Socket Head Cap Captive Screw
- Stainless Steel DIN964 Slotted Raised Countersunk Head Screws
- Stainless Steel DIN966 Cross Recessed Raised Countersunk Head Screws
- Stainless Steel DIN967 Cross Recessed Pan Head Screws with Collar
- Stainless Steel DIN968 Cross Recessed Pan Head Tapping Screws with Collar
- GB830 Stainless Steel Slotted Cheese Head Screws with Shoulder
- Stainless Steel GB831 Slotted Shoulder Screws
- Stainless Steel GB834 Knurled Thumb Screws
- Stainless Steel GB835 Knurled Screws
- Stainless Steel GB836Knurled Screws with Small Head
- Stainless Steel GB837 Slotted Pan Head Screws with Waisted Shank
- Nickel Plated Smooth Shank Single Shoulder Shelf Support Screw
- Nickel Plated Furniture Shelf Peg with Matching Knurled Nut
Application of Stainless Steel GB839 Knurled Thumb Screws with Waisted Shank:
Stainless Steel GB839 Knurled Thumb Screws with Waisted Shank are designed for applications requiring tool-free operation, repeated installation, and reliable fastening performance. The knurled head provides a comfortable grip for hand tightening, while the waisted shank structure helps improve flexibility and reduce stress during use.
| Application | Details |
|---|---|
| Optical Equipment Industry | Used for fixing lenses, adjustment components, protective covers, and optical accessories where frequent manual adjustment and secure positioning are required. |
| Medical Equipment Industry | Applied in medical devices, laboratory instruments, and inspection equipment due to their easy operation, hygienic surface finish, and corrosion-resistant properties. |
| Electronic Equipment Industry | Suitable for fastening detachable panels, circuit housings, testing equipment, and electronic assemblies that require quick access for maintenance. |
| Automation and Robotics Industry | Used in automated machines, robotic systems, and production equipment where components may require regular adjustment, replacement, or servicing. |
| Communication Equipment Industry | Applied in cabinets, terminals, signal devices, and network equipment where stable fastening and convenient maintenance are needed. |
| Laboratory and Testing Instruments | Ideal for experimental equipment, measuring devices, and inspection tools that require repeated assembly and precise positioning. |