Machine Screws
Machine Screws are high-precision threaded fasteners designed for secure assembly in metal, plastic, and composite materials. These screws are commonly used in electronics, automotive, industrial machinery, and appliance manufacturing, offering consistent torque application and high-strength engagement.
At Rajal Industries, we manufacture ISO, ASME, and DIN-compliant machine screws with accurate threading, uniform head styles, and high-strength materials, ensuring long-lasting performance in high-precision applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: M1.6 to M10 (Metric) | ISO 4762 – Standard for socket head machine screws |
| Diameters: 1/4" to 3/4" (Imperial) | ASME B18.6.3 – American standard for machine screws |
| Lengths: Variable | ISO 7045 – Flat head machine screws with cross recess |
| DIN 7985 – Pan head machine screws with cross recess |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Mild Steel & Carbon Steel | 4.6, 5.6, 8.8 | ISO 898-1, ASME B18.6.3 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, DIN 7985 |
| Alloy Steel (Heat Treated) | Class 8.8, 10.9 | ISO 4762, ISO 7045 |
- Heat-Treated for Enhanced Strength –Machine screws undergo quenching and tempering for improved wear resistance and torque capacity.
- Tensile Strength Ratings:
- Carbon Steel Class 8.8 Machine Screw : 800-900 MPa
- Stainless Steel A4-80 Machine Screw : 700-800 MPa
Head & Drive Design Specifications
Multiple Head Styles for Various Applications
- Pan Head (DIN 7985, ISO 7045) – Ensures a low-profile, smooth finish for flush mounting in panels and assemblies.
- Flat Head (Countersunk) Machine Screws – Ideal for surface-flush installations in metal and plastic components.
- Socket Head (ISO 4762) – Allows high torque application in precision machinery.
Threaded & Self-Tapping Variants for Versatile Use
- Fully Threaded Machine Screws – Provide maximum adjustability and load-bearing capability.
- Partially Threaded Machine Screws – Enhance shear strength and impact resistance in structural fastening.
Compatible with Various Drive Styles
- Phillips Drive (Cross Recessed) – Offers easy torque application and prevents cam-out.
- Slotted Drive – Traditional design, used for manual assembly and maintenance-friendly applications.
- Torx& Hex Drive – Provides higher torque resistance, reducing stripping in industrial setups.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/ISO Metric) | Standard for metal-to-metal fastening | Automotive, appliances, machinery |
| Fine Thread (UNF/Metric Fine) | Offers stronger grip & better vibration resistance | Aerospace, electrical enclosures |
| Fully Threaded Machine Screws | Allows maximum adjustability & precise positioning | Electronics, telecom, industrial assembly |
| Partially Threaded Machine Screws | Provides better load absorption & shear resistance | Structural fastening, plastic-to-metal connections |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring smooth and precise engagement.
- Imperial threads comply with ASME B18.6.3 for uniform load distribution
Corrosion Resistance & Environmental Suitability
Machine Screws are used in electronics, machinery, and outdoor equipment, requiring protective coatings for durability.
| Coating Type | Corrosion Protection Level | Ideal Applications |
|---|---|---|
| Plain Steel (No Coating) | Low | Indoor applications |
| Zinc Plated (Yellow/Blue/White/Black) | Moderate (48-96 hours SST) | General industrial, consumer electronics |
| Hot-Dip Galvanized (HDG) | High (600+ hours SST) | Outdoor machinery, structural fasteners |
| Electropolished Stainless Steel | Extreme (1000+ hours SST) | Aerospace, medical, marine applications |
Salt Spray Testing (SST) per ASTM B117 & ISO 9227 ensures long-term corrosion resistance.
Common Applications of Machine Screws
- Electronics & PCB Mounting – Used in computers, appliances, circuit boards, and telecom equipment.
- Automotive & Aerospace Industry – Provides secure fastening in vehicle dashboards, interior panels, and aviation assemblies
- Industrial Machinery & Equipment – Ensures high-precision fastening in pumps, compressors, and motors.
- Renewable Energy & Power Systems – Used in solar panels, battery enclosures, and wind turbine structures.
- Medical & Laboratory Equipment – Fastens diagnostic devices, surgical instruments, and lab equipment.
Why Choose Rajal Industries for Machine Screws?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Customizable Expansion Designs
Available in wedge, sleeve, torque-controlled, and displacement-controlled variants.
Durability & Corrosion Resistance
Engineered with high-quality materials and protective coatings.
Bulk & Custom Orders
Flexible manufacturing capabilities for large-scale and specialized applications.
Stringent Quality Control
Expansion bolts undergo torque testing, pull-out strength verification, and corrosion resistance tests
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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