Knurled Thumb Screws
Knurled Thumb Screws are manually adjustable fasteners designed for quick and tool-free installation or removal. Featuring a knurled head for enhanced grip, these screws allow hand-tightening, making them ideal for electronics, industrial equipment, fixtures, and precision instruments where frequent adjustments or secure hand-tightening is required.
At Rajal Industries, we manufacture precision-engineered Knurled Thumb Screws that conform to DIN and general fastening standards, ensuring high durability, grip efficiency, and long-term performance.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: M3 to M10 (Metric) | DIN 464 – Standard for knurled thumb screws |
| Gauge Sizes: 4 to 12 (Imperial) | General screw standards for tool-free fastening |
| Lengths: 6mm to 50mm | Custom head and grip designs available |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | 4.6, 5.6 | DIN 464, General Thumb Screw Standards |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Brass & Aluminum Alloy | Custom Hardness Ratings | DIN 464, Specialty Fastening Standards |
- Heat-Treated for Maximum Durability –Knurled Thumb Screws undergo precision hardening for enhanced wear resistance and longevity.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 4.6 Knurled Thumb Screw: 800-900 MPa tensile strength
- Stainless Steel A4-80 Knurled Thumb Screw: 700-800 MPa corrosion-resistant strength
Head & Knurling Design Specifications
Knurled Head for Enhanced Manual Grip
- Designed for easy, tool-free adjustment using only fingers.
- The deep knurled pattern ensures a slip-resistant grip, even in high-friction environments.
Available in Various Head Styles for Versatile Applications
- Straight Knurled Head (DIN 464) – Provides maximum grip and high torque for firm tightening.
- Diamond Knurled Head – Offers better finger traction for precision applications.
Winged & Slotted Variants – Allow additional torque control with hand or screwdriver use.
Threaded & Smooth Shank Variants for Different Requirements
- Fully Threaded Thumb Screws – Provide maximum adjustability and load-bearing capacity.
Partially Threaded Thumb Screws – Enhance shear strength and impact resistance in panel fastening.
Precision Machined for High Tolerance Fitment
- Designed to fit precisely with mating components for high retention strength.
- Available with custom shank lengths and grip diameters for specialized uses.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/Metric) | Ensures quick engagement and strong grip | General machinery, enclosures, fixtures |
| Fine Thread (UNF/Metric Fine) | Provides higher torque control and anti-loosening properties | Electronics, instrumentation |
| Fully Threaded Knurled Thumb Screws | Allows maximum engagement and precise adjustments | Industrial tools, calibration equipment |
| Partially Threaded Knurled Thumb Screws | Offers better clamping force and structural strength | Panel fastenings, equipment housing |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring secure engagement in precision applications.
- Imperial Knurled Thumb Screws comply with DIN 464 for industrial and manual adjustment needs.
Common Applications of Knurled Thumb Screws
- Electronic Devices & Enclosures – Ensures quick access to control panels and instrument covers.
- Industrial & Machinery Adjustments – Used in machine guards, fixtures, and adjustable parts.
- Automotive & Aerospace Engineering – Provides manual fastening solutions in lightweight assemblies.
- Medical Devices & Laboratory Equipment – Fastens diagnostic instruments, test equipment, and lab enclosures.
- Photography & Mounting Equipment – Secures camera rigs, tripods, and lighting setups.
Why Choose Rajal Industries for Knurled Thumb Screws?
Manufactured to International Standards
Ensuring precision engineering, durability, and compliance.
Knurled Head for Secure & Tool-Free Fastening
Eliminates the need for wrenches or screwdrivers.
Customizable Designs
Available in different knurling patterns, thread profiles, and grip diameters.
Bulk & Custom Orders
Ideal for electronics, industrial, and specialized applications.
High Strength & Long-Term Durability
Engineered for smooth operation and maintenance-free performance.
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Our Offices
C-204, Vaibhav Platina, Nr. Kaveri Trishra, S P Ring road, Shilaj, Ahmedabad, Gujarat-380054
Call us
+91-846 036 2030
Email Us
rajalfast@gmail.com sales@rajalindustries.com