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Heavy Duty Concrete Screws

No expansion forces

Small edge distances

Full removability

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Sinsun Flat Head Self Tapping Screws: The Clean, Flush Finish Solution

In C20/25 concrete, Sinsun heavy duty concrete screws can handle 8.8 to 13.1 kN loads. Designs that meet ETA standards for both cracked (C1/C2) and non-cracked applications. Diameters range from 3/8" to 5/8" and lengths range from 3" to 12". Prices arquoted raight from the factory. Ask for samples.

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Sinsun Heavy Duty Concrete Screws: The Professional's
Choice for Critical Anchoring

Heavy Duty Hex Head Concrete
Hex Flange Galvanised Concrete Screw
Stainless Steel Heavy Duty Anchor Concrete Screw
Wedge Anchor Concrete Anchors
Heavy Duty Hex Head Concrete
Hex Flange Galvanised Concrete Screw
Stainless Steel Heavy Duty Anchor Concrete Screw
Wedge Anchor Concrete Anchors

Sinsun Concrete Block Screws are ultra-high-strength, self-tapping fasteners that are specifically designed for grouting and filling concrete masonry units (CMUs) and solid masonry substrates, eliminating the need for expansion anchors. They cut the internal threads precisely within pre-drilled holes, providing stable yet removable fastening strength — a critical feature for commercial and industrial installations that require frequent rework or adjustment.

This screw has been tested for use in cracked and uncracked concrete environments and is rated R30 to R120 for fire resistance. It complies with building codes and requirements for structural load-bearing.

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What Makes Sansun Heavy Duty Concrete Screws Better  Than the Rest?

We test our heavy duty concrete screws in real-world B2B projects and by third parties to ensure they can handle heavy loads. Here is a direct comparison of key performance metrics with those of our competitors and the industry as a whole​
Performance Metric Sinsun Heavy Duty Concrete Screws Industry Average Key Competitor (Example: Simpson Titen HD)
Tensile Load (M10 × 100mm, C25 Concrete) 3.8 kN (per ETA Test Report No. 24/0512) 2.9 kN 3.5 kN
Shear Load (M10 × 100mm, C25 Concrete) 4.2 kN 3.3 kN 3.9 kN
Salt Spray Resistance (HDG Coating) 2,000 hours (no red rust) 1,200 hours 1,800 hours
Installation Torque Range 25–35 N·m (M10); 35–45 N·m (M12) 20–30 N·m (M10) 22–32 N·m (M10)
Edge Distance (Minimum) 2× screw diameter (18mm for M9) 3× screw diameter 2.5× screw diameter

It is our optimised thread geometry that gives us our competitive edge. Compared to standard screws, the deep-tooth thread design increases the contact area with concrete by 35%, ensuring an exceptional load-bearing capacity and preventing cracking in masonry substrates caused by expansion forces.By reducing installation time by 40%, this design can reduce labour costs for large-scale B2B projects.

Technical Specifications &  Size Data

Diameter Length Embedment Depth Drill Bit Fixture Thickness Tensile Load (C20/25 Non-Cracked) Tensile Load (C20/25 Cracked) Max Torque
10mm 60mm 50mm 8mm 10mm 6.5 kN 3.6 kN 85 Nm
10mm 80mm 55mm 8mm 25mm 6.5 kN 3.6 kN 85 Nm
10mm 100mm 55mm 8mm 45mm 6.5 kN 3.6 kN 85 Nm
10mm 120mm 55mm 8mm 65mm 6.5 kN 3.6 kN 85 Nm
10mm 140mm 55mm 8mm 85mm 6.5 kN 3.6 kN 85 Nm
10mm 160mm 85mm 8mm 75mm 13.1 kN 9.0 kN 85 Nm
12mm 80mm 50mm 10mm 30mm 8.8 kN 5.7 kN 100 Nm
12mm 100mm 50mm 10mm 50mm 8.8 kN 5.7 kN 100 Nm
12mm 120mm 65mm 10mm 55mm 13.1 kN 9.0 kN 100 Nm
12mm 140mm 65mm 10mm 75mm 13.1 kN 9.0 kN 100 Nm
12mm 160mm 65mm 10mm 95mm 13.1 kN 9.0 kN 100 Nm
14mm 100mm 65mm 12mm 35mm 7.1 kN 4.0 kN 100 Nm
16mm 80mm 55mm 14mm 25mm Data available on request Data available on request Contact engineering

Applications: Where Heavy Duty Concrete Screws 

Steel supports and connections between structures

1. Steel supports and connections between structures

Attaching steel columns, beams, and support brackets to concrete slabs and foundations. ETA-approved for use in cracked and uncracked concrete structures.

Why Sinsun? It can hold 13.1 kN of tensile strength in C20/25 concrete. No expansion stress keeps concrete strong.

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Curtain Wall Systems and Facade Substructures

2. Curtain Wall Systems and Facade Substructures

Secure facade brackets and curtain wall anchors through insulation layers. Stainless steel options are available for places where things can corrode.

Why Sinsun: It comes in lengths up to 200 mm to fit thick insulation. A 60-year warranty on service life for significant facades.

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Anchoring heavy equipment

3. Anchoring heavy equipment

Installing industrial machines, generators, compressors, and HVAC units. Options are available that are ted for seismic activity in earthquake zones.

Why Sinsun: C1 and C2 seismic standards are met. The equipment is completely removable for moving equipment.

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Railings and Handrails

4. Railings and Handrails

Ensure the safety of public places, stadiums, and transportation hubs by installing railings. Fire-rated egress paths are provided.

Sinsun: Fire resistance R30–R120 is available. Tested for moving loads.

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Coating & Material Options

Coating / Material Corrosion Resistance Best Application Standards
Zinc Flake (CrVI-free) 1,000+ hours salt spray General exterior, industrial CrVI-free, RoHS
ML (Multi Layer) Coating 2,016+ hours salt spray C3 "very high" corrosion class DIN EN ISO 12944-6
Hot-dip Galvanized 1,000+ hours Heavy outdoor, freshwater ASTM A153
304 Stainless (A2) 1,500+ hours Coastal inland, food ISO 3506
316 Stainless (A4) 5,000+ hours Marine, chemical, saltwater ISO 3506

Installation Guide

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    Step 1: Make a Hole

    Use a hammer drill with a carbide-tipped bit of the right size.

    Drill at least 10mm deeper than the required embedment depth (for dust).

    Drilling deep enough for overhead installations means you don't have to clean them.

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    Step 2: Get the hole clean

    A necessity for heavy-duty use-dust greatly reduces holding power.

    Compressed air (most useful).

    At least four times, brush with a wire brush and blow.

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    Step 3: Put the screw in

    Use the right electric or impact wrench，drive at moderate speeds.

    No tightening torque is set; stop when the head touches the fixture.

    For push-through installations, the screw passes through the fixture before touching the concrete.

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    Step 4: Check the installation

    The head must rest fully on the fixture.

    Make sure the seat is the right.

    No need to over-torque.

hardware

Real Customer
Feedback

"We used Sinsun M10 × 120 mm heavy-duty concrete screws to secure pipe racks in a petrochemical plant. In order to meet our safety standards, the 3.8 kN tensile load was very important.Despite the humid, corrosive environment, the HDG coating has not rusted after 10 months.We saved 15% on labor costs for an order of 50,000 pieces, and installation was 30% faster than with wedge anchors. This is the third year in a row that we have renewed our annual contract.

The primary objective of the project is to install the pipe racks at the Petrochemical Plant. — Mohammed A.

"As a maker of industrial storage racks, we needed strong concrete screws that could handle a shear load of 4 kN or more for our heavy-duty racking systems. Sinsun's M10 screws were better than what we needed, and their consistent lead times (7 days for stock) helped us catch up with production. The ETA certification was very critical for our EU building code submissions. The fact that we could change the lengths (140 mm) made it possible for us to fit our unique rack designs. Sinsun now gets 100,000 pieces every three months.

— Thomas B., Engineering Director | Project: Industrial Storage Rack OEM | Quantity: 100,000 pcs/quarter | Date: 2025

"We sell fasteners to commercial construction companies all over the Southeast, and Sinsun's heavy-duty concrete screws are our best-selling item. Contractors love how easy it is to install and how much weight it can hold. We haven't had any returns due to performance problems. With Sinsun's volume pricing (15% off for orders of more than 10,000 pieces), we are able to keep our prices competitive.They even provided free load calculations for a hospital expansion project, which helped us secure a $200,000 order.

— Jennifer L., Sales Manager | Business: Building Material Distribution | Quantity: 200,000 KGS/year |

FAQ

FAQ: Heavy Duty Concrete Screws

Q: What makes a concrete screw "heavy duty?"

A: Heavy duty concrete screws are larger diameters (10mm–16mm), have ETA/ICC approvals for cracked and non-cracked concrete, carry seismic and fire ratings, and deliver tensile loads exceeding 8 kN in C20/25 concrete.

Q: Are Sinsun heavy duty screws approved for cracked concrete?

A: Yes. Our designs comply with the ETA Option 1 requirements for use in damaged and non-cracked concrete. Performance data for fractured conditions are provided in our technical tables.

Q: What is the difference between C1 and C2 categories?

A: C2 is a higher performance category for more demanding seismic applications. Sindun screws are available with C2 seismic performance depending on embedment depth.

Q: Do I need to clean the hole?

A: Yes, thorough hole cleaning with compressed air is mandatory. For overhead installations, drilling deep enough can sometimes eliminate the need for cleaning.

Q: Can heavy-duty concrete screws be removed?

A: Yes. You can remove and reuse them for temporary projects. For permanent installations, single use is recommended.

Q: How much torque should I apply?

A: Drive until the head touches the fixture; too much torque can strip threads. Our tables provide safety limits, not installation targets.

Q: Do I need a torque wrench?

A: No. Electric or impact wrenches are better. You don't need to control torque because the screw stops when the head seats.

Q: What drill bit for 12mm screw?

A: Use a 10mm carbide-tipped bit. The hole for a heavy-duty concrete screw must be smaller than the screw itself.

Q: Use in brick or masonry?

A: Mainly designed for concrete. They may work in solid brick, but ETA approvals are specific to concrete.

Q: Salt spray resistance?

A: Zinc flake coatings withstand salt spray for 1,000+ hours. For marine environments, 316 stainless steel is best.

Why should you get your B2B
heavy-duty concrete screws from Sinsun?

  • - Factory-Direct Pricing: Get rid of the middlemen and save 20–25% on bulk orders compared to branded competitors.

  • - Global Compliance: ETA, CE, and ISO 898-1 certifications make it easy to submit code in the EU, US, Middle East, and Asia.

  • - Customization Options: You can change the sizes, coatings, and head styles to fit your OEM or project needs.

  • - Dependable Lead Times: 98% of stock orders ship within three days, which is very critical for B2B projects that need to be done quickly.

  • - Technical Support: Free load calculations, training on how to install things, and engineering advice specific to your project.

  • - Bulk Logistics: Working with top carriers like Maersk and MSC to get the most competitive shipping rates and deliver on time to ports around the world.

Keep In Touch

TO KNOW MORE ABOUT Sinsun, PLEASE CONTACT US!

We are committed to providing you with the best quality service and look forward to communicating with you to solve problems together and bring you a better experience.

our experts will solve them in no time.