GB834 Knurled Thumb Screws
GB 834 Knurled Thumb Screws feature a high knurled head designed for convenient hand tightening and adjustment without the need for a separate tool. The knurled surface provides a firm grip, while the threaded shank secures components in mechanical assemblies and equipment.
Manufactured according to GB/T 834-1988, these screws are available in metric sizes from M1.6 to M10. The standard defines the key dimensions of the knurled head, threaded shank, and screw length to ensure consistent fit and assembly. GB 834 Knurled Thumb Screws are suitable for manual adjustment, component fastening, fixtures, instruments, machinery, and equipment where frequent installation or adjustment is required. Different materials and surface finishes can be supplied according to the application and customer requirements.
Specification:
GB 834 Knurled Thumb Screws are manufactured according to GB/T 834-1988, which specifies the dimensions and technical requirements for high-type knurled thumb screws. The standard defines the main dimensions of the knurled head, shank, thread, and screw length to ensure consistent fit and assembly.
The screws use metric threads with the applicable thread dimensions and tolerances specified by the relevant Chinese standards. GB 834 covers sizes from M1.6 to M10, with dimensions selected according to the applicable standard requirements. Carbon steel and stainless steel versions can be supplied according to the required application, material specification, and customer drawings.
| Item | Specification |
|---|---|
| Standard | GB834 |
| Product Typle | Knurled Thumb Screw |
| Head Type | High Knurled Head |
| Drive Type | Knurled Head,Hand Tightening |
| Size Rangle | M1.6-M10 |
| Thread Standard | ISO261,ISO965 |
| Thread Tolerance | 6g |
| Class | 4.8,A2-70 |
| Mechanical Proeprty | ISO898-1,ISO3506-1 |
| Material | Carbon Steel,Stainless Steel |
| Surface Treatment | Zinc Plated, Black Oxidation,Bright Finish |
| Packaging: | Boxes/cartons into wooden pallets |
Dimension Chart of GB834 Knurled Thumb Screws:
GB 834 Knurled Thumb Screws are available in metric sizes from M1.6 to M10. The dimension chart includes the key measurements of the screw, such as knurled head diameter, head height, thread diameter, thread length, and overall length. The knurled head provides a firm gripping surface for manual tightening and adjustment, while the threaded shank provides the required engagement with the mating component. Head and thread dimensions should be selected according to GB/T 834-1988 and the requirements of the specific assembly.
| Mon | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
| P | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| dk max | 7.22 | 8.22 | 9.22 | 11.27 | 12.27 | 16.27 | 20.33 | 24.33 | 30.33 |
| dk min | 6.78 | 7.78 | 8.78 | 10.73 | 11.73 | 15.73 | 19.67 | 23.67 | 29.67 |
| k max | 4.7 | 5 | 5.5 | 7 | 8 | 10 | 12 | 16 | 20 |
| k min | 4.52 | 4.82 | 5.32 | 6.78 | 7.78 | 9.78 | 11.57 | 15.57 | 19.84 |
| k1 | 2 | 2 | 2.2 | 2.8 | 3 | 4 | 5 | 6 | 8 |
| h | 0.8 | 1 | 1 | 1.2 | 1.5 | 2 | 2.5 | 3 | 3.8 |
| r min | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 |
| d1 | 4 | 4.5 | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| d2 | 3.6 | 3.8 | 4.4 | 5.2 | 6.4 | 9 | 11 | 13 | 17.5 |
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Application of GB834 Knurled Thumb Screws:
Manual Adjustment
GB 834 Knurled Thumb Screws are designed for applications requiring frequent manual tightening, loosening, or adjustment. The high knurled head provides a firm grip, allowing the screw to be operated by hand without a separate tool.
Mechanical Equipment
These screws are suitable for mechanical equipment, machinery, and assemblies where components need to be secured while still allowing convenient access for manual adjustment or removal.
Fixtures and Jigs
The compact design makes GB 834 screws suitable for fixtures, jigs, tooling, and positioning mechanisms, particularly where an operator needs to adjust or secure a component during setup.
Instruments and Equipment
Knurled thumb screws can be used in instruments, control equipment, laboratory equipment, and compact assemblies where tool-free adjustment is preferred.