Rajal Industries

Rajal Industries Rajal Industries – Manufacturer of Industrial Fasteners & CNC Components
Precision-made bolts, nuts, washers, studs & custom parts.

Supplying India & global buyers with consistent quality since 1995. At Rajal Industries, we're your trusted source for high-quality industrial fasteners. We specialize in the production of a wide range of industrial products, including threaded and non-threaded fasteners, metal machine auto parts, automotive components, turned and machined engineering components, and customized parts tailored to y

our specific needs. Established in 2016, we've quickly risen as a leading name in the industry. Our commitment to customer satisfaction is unwavering, backed by our dedication to top-tier products and exceptional service. Our expert team stays ahead of market trends and technology, ensuring we deliver the best to our customers. We take pride in providing fasteners that meet the highest standards of quality and performance. For all your fastener needs, whether standard or customized, contact us today. Let's build a stronger future together!

The wrong drywall screw can slow down an entire projectA drywall screw is not selected by diameter and length alone.Cons...
18/08/2026

The wrong drywall screw can slow down an entire project

A drywall screw is not selected by diameter and length alone.

Consider a gypsum board installation on light-gauge metal framing. The buyer needs to check:

Board thickness
Number of layers
Metal thickness
Thread type
Screw diameter
Screw length
Point design
Required pe*******on
Drive type
Installation method

Fine-thread screws are commonly associated with suitable light-gauge metal framing, while coarse-thread screws are commonly associated with suitable wood framing. But the approved construction-system specification should always control the final selection.

Head depth matters too. Over-driving can damage the gypsum board facing, while insufficient depth can leave the head above the surface and create finishing problems.

For high-volume projects, test the screw with the actual board, framing and installation equipment before bulk approval.

Fine thread or coarse thread? The framing decides.For drywall installation, don't select the screw simply because it is ...
18/08/2026

Fine thread or coarse thread? The framing decides.

For drywall installation, don't select the screw simply because it is called a gypsum screw.

If gypsum board is fixed to light-gauge metal, buyers commonly evaluate fine-thread designs.

For suitable wood framing, coarse-thread drywall screws are commonly associated with the application.

But there is more to check:

🔩 Board thickness
🔩 Number of layers
🔩 Frame thickness
🔩 Screw diameter
🔩 Screw length
🔩 Point design
🔩 Head geometry
🔩 Drive recess
🔩 Required pe*******on
🔩 Surface finish

For metal studs, thicker framing may require a different point or self-drilling screw design.

And don't ignore installation depth. A screw driven too deeply can damage the paper facing and reduce support around the head.

Engineering CTA: Validate the screw against the actual gypsum board, framing thickness and production installation tool before placing a high-volume order.

The correct furniture screw starts with the board.MDF, particle board and plywood are not interchangeable substrates.For...
17/08/2026

The correct furniture screw starts with the board.

MDF, particle board and plywood are not interchangeable substrates.

For an MDF furniture joint, check:

🔩 Board density
🔩 Board thickness
🔩 Face or edge fastening
🔩 Screw diameter
🔩 Screw length
🔩 Thread geometry
🔩 Pilot-hole size
🔩 Edge distance
🔩 Installation torque

A 4 × 40 mm chipboard screw is only a starting description. Two screws with the same diameter and length can perform differently because their thread geometry, core diameter and head/drive design can differ.

A pilot hole that is too small can increase driving torque and board stress. Too large can reduce thread engagement and pull-out resistance.

For high-volume furniture manufacturing, don't test the screw alone.

Test:

Board + Screw + Joint + Pilot Hole + Driver Bit + Production Tool.

One screw size. Four industries. Four different engineering requirements.Self-drilling screws are used across:🔩 Metal Ro...
17/08/2026

One screw size. Four industries. Four different engineering requirements.

Self-drilling screws are used across:

🔩 Metal Roofing
🔩 PEB Buildings
🔩 Solar Equipment
🔩 Steel Fabrication
🔩 HVAC
🔩 Industrial Enclosures
🔩 Telecom Equipment
🔩 BESS

But don't specify them only by diameter and length.

ROOFING:
Check drill point, EPDM washer, sealing and corrosion protection.

PEB:
Check supporting steel thickness, total drilling thickness and drill-point capacity.

SOLAR:
Check outdoor exposure, corrosion and material compatibility.

STEEL FABRICATION:
Check exactly how much steel the screw must drill through.

Example: 0.8 mm sheet + 3.0 mm supporting steel = 3.8 mm total material thickness.

The drill point must pe*****te the complete stack before proper thread engagement can occur.

And a roofing or cladding screw should not automatically replace a structural bolt in a primary structural connection.

A chipboard screw can have the correct size and still be wrong for the joint.For example:4 × 40 mmThat tells you the nom...
14/08/2026

A chipboard screw can have the correct size and still be wrong for the joint.

For example:

4 × 40 mm

That tells you the nominal diameter and length. It does not define the complete screw.

For furniture production, also check:

🔩 Thread pitch
🔩 Thread depth
🔩 Core diameter
🔩 Point geometry
🔩 Head angle & diameter
🔩 Drive type
🔩 Material
🔩 Heat treatment
🔩 Surface finish
🔩 Board thickness

For an 18 mm MDF assembly, also check edge distance, pilot-hole requirement and installation torque.

A pilot hole that is too small can increase driving torque and board stress. Too large can reduce thread engagement and pull-out performance.

And if your factory installs 500,000 screws/month, poor drive-recess consistency can quickly become a production problem.

Validate the complete screw-and-board combination before bulk approval.

Your furniture screw can be the correct size and still be the wrong screw.For a chipboard or MDF joint, check:🔩 Board ma...
14/08/2026

Your furniture screw can be the correct size and still be the wrong screw.

For a chipboard or MDF joint, check:

🔩 Board material
🔩 Board thickness
🔩 Screw diameter
🔩 Screw length
🔩 Thread geometry
🔩 Head style
🔩 Drive type
🔩 Pilot hole
🔩 Installation torque
🔩 Surface finish

For example, an 18 mm MDF assembly should not be specified simply as “4 × 40 mm screw.” The joint design, required engagement, edge distance and pilot-hole requirement also need to be considered.

A pilot hole that is too small can increase driving torque and splitting risk. Too large can reduce thread engagement and holding performance.

And if your factory installs hundreds of thousands of screws, drive recess consistency matters. Bit slipping, cam-out and damaged heads can quickly become production problems.

Validate the screw in the actual board and with the actual production tool before bulk approval.

“1,000 hours salt spray” sounds precise. But is it enough?Not for a proper roofing fastener specification.Before approvi...
13/08/2026

“1,000 hours salt spray” sounds precise. But is it enough?

Not for a proper roofing fastener specification.

Before approving a self-drilling screw, define:

🔩 Test standard
🔩 Test duration
🔩 Coating system
🔩 White-corrosion criteria
🔩 Red-rust criteria
🔩 Inspection method

The corrosion requirement should also match the real environment:

• Indoor
• Outdoor
• High humidity
• Coastal
• Industrial pollution
• Rain exposure
• Long project life

Zinc Plated, Zinc-Nickel and Zinc Flake coatings can have different intended applications and corrosion-performance requirements.

And one important point:

1,000 laboratory salt-spray hours should not automatically be treated as a fixed number of years of outdoor service.

For a large roofing or PEB project, this detail belongs in the RFQ before the first bulk order.

Same diameter does not mean same drilling performance.Two self-drilling screws can both be 5.5 mm but have different dri...
12/08/2026

Same diameter does not mean same drilling performance.

Two self-drilling screws can both be 5.5 mm but have different drilling capabilities because their point geometry, material and heat treatment may differ.

Before selecting the screw, check:

✔ Drill point type
✔ Drilling capacity
✔ Steel grade
✔ Total drilling thickness
✔ Screw material
✔ Heat treatment
✔ Installation RPM
✔ Installation pressure

Point designs such as #1, #2, #3, #4 and #5 are used for different drilling requirements. However, point numbers are not universal performance ratings, so always verify the manufacturer's technical data.

For roofing and PEB applications, also check the head, washer, coating and corrosion requirement.

The right self-drilling screw is selected from the complete joint, not from diameter alone.

The drill point is not a small detail. It determines whether a self-drilling screw can actually pe*****te the joint.Befo...
12/08/2026

The drill point is not a small detail. It determines whether a self-drilling screw can actually pe*****te the joint.

Before selecting a screw for roofing, PEB or steel fabrication, check:

✔ Steel grade
✔ First-layer thickness
✔ Supporting steel thickness
✔ Total drilling thickness
✔ Drill-point type
✔ Screw diameter & length
✔ Material & heat treatment
✔ Coating
✔ Washer requirement

Common sizes include 3.5, 4.2, 4.8, 5.5 and 6.3 mm, but the same diameter does not mean the same drilling capacity.

For roofing screws with EPDM washers, installation torque matters too. Too much compression can damage the sealing washer; too little can affect clamping and weather sealing.

And remember: a PEB or roofing screw should not automatically replace a structural bolt in a primary structural connection.

Address

R. S. No. 2912/P, B/h. Meldi Maa Temple, Old Dedadra, Road, Wadhavan
Wadhwan City
363030

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm

Telephone

+918460362030

Website

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