Coach Screws
Coach Screws, also known as lag screws or lag bolts, are heavy-duty fasteners designed for strong and secure fastening in wood, masonry, and structural applications. These screws feature a hexagonal head and deep coarse threads, ensuring high grip strength, resistance to pull-out, and enhanced load-bearing capacity.
At Rajal Industries, we manufacture high-performance coach screws that conform to DIN and ASME standards, offering superior strength, long-term durability, and ease of installation in construction, carpentry, and heavy engineering applications.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: M6 to M20 (Metric) | DIN 571 – Standard for hexagonal head coach screws |
| Diameters: 1/4" to 1" (Imperial) | ASME B18.2.1 – American standard for lag screws |
| Lengths: 50mm to 300mm | General screw standards for timber & masonry fastening |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Carbon Steel & Mild Steel | 4.6, 5.6, 8.8 | DIN 571, ASME B18.2.1 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506 |
| Hardened Steel (Heat Treated) | Class 8.8, 10.9 | DIN 571, ASME B18.2.1 |
- Heat-Treated for Maximum Strength –Coach screws undergo quenching and tempering for enhanced impact resistance and high pull-out strength.
- Load Ratings Based on Material & Application:
- Carbon Steel Class 8.8 Coach Screw: 800-900 MPa tensile strength
- Stainless Steel A4-80 Coach Screw: 700-800 MPa corrosion-resistant strength
Head & Thread Design Specifications
Hexagonal Head for Secure Torque Application
- Designed for high-torque tightening using wrenches and power tools.
- Ensures maximum clamping force and uniform load distribution.
Deep, Coarse Thread Profile for Strong Grip
- Threads are engineered for superior penetration into timber and masonry.
- Provides enhanced resistance against loosening due to vibration.
Self-Tapping & Pre-Drilled Hole Compatibility
- Can be driven directly into softwood and plastic plugs in masonry.
- For hardwood and structural applications, pre-drilled pilot holes improve efficiency.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (Wood Threading) | Provides fast penetration and high retention strength | Timber, beams, furniture |
| Self-Tapping Thread | Ensures quick and secure grip in masonry plugs | Brick, concrete, stone |
| Fully Threaded Coach Screws | Maximizes holding power and prevents loosening | Heavy-duty load-bearing applications |
| Partially Threaded Coach Screws | Offers better clamping force and higher shear resistance | Structural joints, framework fastening |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring secure engagement with timber and masonry materials.
- Imperial coach screws comply with ASME B18.2.1 for general construction and engineering applications.
Common Applications of Coach Screws
- Timber Construction & Carpentry – Ensures secure fastening of wooden beams, frames, and furniture.
- Masonry & Concrete Fixings – Used with wall plugs for strong anchoring in bricks, concrete, and stone.
- Heavy Machinery & Industrial Equipment – Provides stable mounting in wooden platforms and bases.Provides high-strength fastening in moving parts and high-vibration environments.
- Outdoor Structures & Landscaping – Ideal for pergolas, decking, fencing, and timber frames.
- Railway, Marine & Infrastructure Projects – Used in heavy-duty load-bearing applications.
Why Choose Rajal Industries for Coach Screws?
Manufactured to International Standards
Ensuring precision engineering, durability, and compliance.
Customizable Designs
Available in different thread types, coatings, and head styles.
Bulk & Custom Orders
Ideal for construction firms, furniture manufacturers, and infrastructure projects.
High Retention Strength & Quick Installation
Engineered for secure, high-load fastening in wood and masonry.
Stringent Quality Control
Each screw undergoes torque testing, thread fitment verification, and shear strength assessment.
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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