Heavy-Duty Stainless Steel Knurled Thumb Screws
Youjia Metals manufactures stainless steel knurled thumb screws for tool-free adjustment in industrial, marine, machinery, lighting, and equipment assemblies. The large knurled head provides a secure hand grip, while precision-machined threads support smooth installation and repeated use.
Material Options
- AISI 304 stainless steel: suitable for general industrial, indoor, and outdoor applications.
- AISI 316 stainless steel: recommended for marine, coastal, high-humidity, and chloride-exposed environments.
- Custom materials: available according to drawings and application requirements.
Available Sizes and Features
- Metric sizes from M3 to M20; inch threads available on request
- Coarse, fine, UNC, and UNF thread options
- Large circular knurled, flat hand-tighten, slotted, and custom head designs
- Polished, mirror-polished, electropolished, or application-specific finishes
- Custom thread pitch, head diameter, shank length, and knurling pattern
Reference Dimensions
| Thread Size | Pitch (mm) | Head Diameter | Head Thickness |
|---|---|---|---|
| M3 | 0.5 | 0.398–0.406 in | 0.197 in |
| M4 | 0.7 | 0.476–0.484 in | 0.209 in |
| M5 | 0.8 | 0.634–0.642 in | 0.205 in |
| M6 | 1.0 | 0.787–0.795 in | 0.201 in |
| M8 | 1.25 | 0.988–0.996 in | 0.197 in |
| M10 | 1.5 | 0.984–0.988 in | 0.205 in |
Reference dimensions only. Final dimensions and tolerances are confirmed against the approved drawing.
Typical Applications
- Marine and rigging hardware
- Industrial machinery and inspection equipment
- Camera rigs, lighting stands, and quick-release assemblies
- Solar mounting and renewable-energy equipment
- Fixtures requiring frequent tool-free adjustment
Custom Manufacturing Support
Send your STP, STEP, PDF, or DWG drawing for engineering review. We support non-standard dimensions, prototypes, and production quantities. Material grade, tolerances, surface finish, packaging, and inspection requirements can be confirmed before production.
Request a Quote
For an accurate quotation, please provide the thread size, material grade, quantity, drawing or key dimensions, finish, and required delivery destination.
Contact Youjia Metals or message us on WhatsApp: +86 159 5269 3580.
