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CE EN1090 & ISO 3834 Certified Manufacturer
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Scaffolding Couplers & Clamps

Scaffolding Couplers Manufacturer & Supplier in China

Sino East Steel Group manufactures a complete range of forged and pressed scaffolding couplers for tube & clamp systems. EN74, BS1139 & AS1576 compliant. Drop-forged and stamped steel fittings for construction, shoring, and formwork applications worldwide.

25+Coupler Types
EN74 / BS1139Certified Standards
65,000 m²Factory Facility
50+Export Countries
Half Coupler for Scaffolding - Sino East Manufacturer
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Half Coupler / Single Coupler

Half Coupler for Scaffolding

EN74 Class B · Forged Steel · 48.3mm Tube

The half coupler (also called single coupler) is designed to connect a transom or ledger tube to a standard at a right angle using a single jaw. Manufactured from drop-forged steel with a high-tensile T-bolt, our half couplers deliver reliable load transfer for board-bearing transoms in tube & clamp scaffolding systems.

  • Drop-forged body for maximum strength and toughness
  • Fits standard 48.3mm outer diameter scaffolding tubes
  • High-tensile T-bolt with hex nut for secure tightening
  • Electro-galvanized or hot-dip galvanized finish available
  • Slip resistance and crack load tested to EN74 Class B
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Scaffold Clamp - Drop Forged Right Angle Coupler
Scaffold Clamp / Right Angle Coupler

Drop-Forged Scaffold Clamp

90° Connection · Double Coupler · Heavy Duty

Our scaffold clamp is a right-angle (double) coupler that joins two tubes at 90 degrees, forming the primary load-bearing connection in tube & clamp scaffolding. The drop-forged construction provides superior resistance to slip and distortion under load, making it ideal for structural scaffolding, shoring towers, and heavy-duty access platforms.

  • Drop-forged steel body — higher strength than pressed variants
  • Connects tubes at fixed 90° right angle
  • Meets EN74 Class B and BS1139 performance requirements
  • Reinforced hinge bolt and T-bolt for repeated assembly cycles
  • Corrosion-resistant galvanized finish for outdoor durability
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Scaffolding Clamp - Pressed Steel Coupler Fitting
Pressed Scaffolding Clamp

Pressed Steel Scaffolding Clamp

Cost-Effective · Lightweight · Class A Loading

Pressed scaffolding clamps offer an economical solution for standard-loading scaffold connections. Formed from high-quality steel plate through precision stamping, these couplers are lighter in weight while still meeting EN74 Class A slip and crack load requirements. An excellent choice for general access scaffolding and rental fleets where cost efficiency matters.

  • Stamped steel plate construction — economical and lightweight
  • Available as right-angle, swivel, and sleeve configurations
  • EN74 Class A compliant for standard scaffold loading
  • Smooth electro-galvanized surface for rust protection
  • Batch-tested for slip resistance and crack load performance
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Scaffolding Coupler Collection - Forged Fittings
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Complete Coupler Range

Full Range of Scaffolding Couplers

Right Angle · Swivel · Sleeve · Putlog · Beam Clamp

Beyond half couplers and clamps, Sino East manufactures the full spectrum of scaffolding fittings to cover every connection requirement on your project. From swivel couplers for angled braces to sleeve couplers for end-to-end tube joints, each fitting is engineered to international standards and quality-tested before dispatch.

  • Right Angle Coupler (Double): 90° load-bearing connection
  • Swivel Coupler: 360° rotation for diagonal braces
  • Sleeve Coupler: End-to-end tube joint for longer runs
  • Putlog Coupler (Single): Attaches putlog to ledger
  • Beam Clamp / Gravlock: Secures scaffold to structural steel beams
  • Joint Pin Coupler: Internal expanding connection for tube joints
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Technical Specifications

Scaffolding Coupler Specifications

Standard specifications for our most-requested coupler types. Custom sizes, finishes, and configurations are available on request — contact our engineering team with your requirements.

Coupler Type Tube Size (OD) Standard Material Finish Class Weight (approx)
Right Angle Coupler (Double) 48.3 mm EN74 / BS1139 Q235 Forged Steel Electro-Galvanized Class B 1.05 kg
Swivel Coupler 48.3 mm EN74 / BS1139 Q235 Forged Steel Electro-Galvanized Class B 1.15 kg
Sleeve Coupler 48.3 mm EN74 / BS1139 Q235 Pressed Steel Electro-Galvanized Class A 0.65 kg
Putlog Coupler (Single) 48.3 mm EN74 / BS1139 Q235 Forged Steel Electro-Galvanized Class B 0.62 kg
Half Coupler 48.3 mm EN74 / BS1139 Q235 Forged Steel Hot-Dip Galvanized Class B 0.55 kg
Beam Clamp (Gravlock) 48.3 mm EN74 / BS1139 Q345 Forged Steel Hot-Dip Galvanized Class B 1.35 kg
Joint Pin Coupler 48.3 mm EN74 Q235 Steel Zinc Plated — 0.48 kg
Pressed Right Angle Coupler 48.3 mm EN74 Q235 Pressed Steel Electro-Galvanized Class A 0.78 kg

* Specifications are indicative. Custom dimensions, materials, and finishes available. Contact us for a detailed datasheet.

Why Choose Sino East Couplers

Advantages of Our Scaffolding Couplers

Every coupler leaving our factory is built to perform under real job-site conditions. Here is what sets Sino East couplers apart from the rest.

⚔

Forged Steel Strength

Drop-forged bodies deliver higher tensile strength and impact resistance than pressed alternatives, ensuring reliable performance under heavy loads and repeated use cycles.

🛡

Standards Compliant

Manufactured and tested to EN74, BS1139, and AS1576. Each batch undergoes slip resistance, crack load, and distortion testing in our in-house laboratory.

🌀

Anti-Corrosion Finish

Electro-galvanized and hot-dip galvanized options protect against rust in marine, industrial, and outdoor environments, extending service life and rental ROI.

🔧

Precision Fit

Tight manufacturing tolerances ensure a snug fit on 48.3mm tubes. Consistent jaw alignment means faster assembly and fewer rejected fittings on site.

🏭

Factory-Direct Value

Buying direct from our 65,000 m² Tianjin factory eliminates middleman markups. Competitive unit pricing on bulk and container orders.

🌍

Global Delivery

Experience exporting to 50+ countries across Europe, North America, the Middle East, and Southeast Asia. Full export documentation and door-to-door logistics.

Applications

Where Scaffolding Couplers Are Used

Tube & clamp scaffolding built with our couplers serves diverse construction and industrial applications worldwide.

🏗

Building Construction

Access scaffolding for facades, masonry, and painting on residential and commercial buildings.

🌁

Industrial Plants

Maintenance and turnaround scaffolding for refineries, power plants, and chemical facilities.

🚨

Bridge & Infrastructure

Shoring and formwork support for bridges, viaducts, and civil engineering works.

🏠

Event & Stage

Temporary structures, stages, and grandstands for concerts, exhibitions, and events.

Manufacturing Process

How We Manufacture Scaffolding Couplers

From raw steel to certified finished product — a controlled four-stage process ensures consistent quality on every batch.

Forging & Stamping

Steel billets are heated and drop-forged, or plates are precision-stamped, to form coupler bodies with the required structural integrity.

Machining & Assembly

Hinge bolts, T-bolts, and nuts are machined to spec. Components are assembled with calibrated torque to ensure proper jaw alignment.

Surface Treatment

Couplers are electro-galvanized or hot-dip galvanized for corrosion protection, then inspected for coating uniformity and adhesion.

Testing & Packing

Each batch undergoes slip resistance and crack load testing to EN74. Approved couplers are packed and palletized for export shipment.

FAQ

Scaffolding Coupler Frequently Asked Questions

Answers to the most common questions about our scaffolding couplers, standards, and ordering process.

What standards do Sino East Steel Group couplers comply with? +

Our scaffolding couplers are manufactured and tested in compliance with EN74 (European scaffolding coupler standard), BS1139 (British standard for metal scaffolding), and AS1576 (Australian scaffold standard). Each batch undergoes slip resistance and crack load testing in our in-house laboratory.

What is the difference between forged and pressed couplers? +

Forged couplers are made from a single billet of steel heated and shaped under pressure, offering superior strength and toughness for heavy-duty applications. Pressed couplers are formed from steel plate through stamping, providing a cost-effective solution for standard loading. Both types meet EN74 Class A or Class B requirements.

What sizes of scaffolding tubes do your couplers fit? +

Our standard couplers fit 48.3mm outer diameter tubes (the most common scaffolding tube size worldwide). We also supply couplers for 48mm, 60mm, and custom diameters upon request. Tube wall thickness typically ranges from 3.2mm to 4.0mm.

Can I get scaffolding couplers with my own brand or logo? +

Yes. We offer custom branding including embossed logos, trademark stamping, and color-coded marking on coupler bodies. Minimum order quantities apply for custom branding. Contact our sales team with your branding requirements.

What surface finishes are available for scaffolding couplers? +

We offer electro-galvanized (zinc plating), hot-dip galvanized, painted, and plain (oiled) finishes. Hot-dip galvanizing provides the best corrosion resistance for outdoor and marine environments. Electro-galvanized is economical for indoor or temporary use.

What is the minimum order quantity and lead time? +

Minimum order quantity is typically 1,000 pieces per coupler type. Lead time is 15-25 days depending on order volume and finish requirements. For stock items, shipment can be arranged within 7 days. Contact us for a precise quote and delivery schedule.

Get a Quote on Scaffolding Couplers Today

Tell us your coupler types, quantities, and finish requirements — our team provides a detailed quote with factory-direct pricing within 24 hours.

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Scaffolding Coupler Specifications

TypeSpecification
Double (Right-Angle) CouplerEN74 Class B, drop forged, 48.3 mm tube, approx. 1.0–1.2 kg
Swivel CouplerEN74 Class B, drop forged, 48.3 mm, adjustable angle, approx. 1.4 kg
Putlog (Single) Coupler48.3 mm tube + 30–75 mm blade range
Sleeve CouplerInternal joint for end-to-end tube connection, approx. 0.6 kg
Beam ClampAdjustable jaw 5–50 mm flange, drop forged
Pipe Clamp / U-Bolt48.3 mm tube to I-beam/pipe attachment
Bolt & NutM12 high-tensile (class 8.8), cast iron or forged nut
CoatingHot-dip galvanized or electro-galvanized (zinc plated)
ComplianceEN74-1 Class A/B, BS 1139, ISO 9001:2015; permanent marking on every piece

Scaffolding Couplers FAQ

What is the difference between EN74 and BS1139 couplers?

EN74-1 is the current European standard defining Classes A (heavy structural), B (general purpose) and C (light duty) with specific load test requirements. BS1139 is the UK/Commonwealth specification for metal scaffolding components. Both fit 48.3 mm tube; buy to the standard your project or local authority specifies — and never mix unmarked components.

Should I choose drop forged or pressed couplers?

Drop forged couplers are formed from a solid steel billet with grain flow following the jaw shape, giving the highest strength and fatigue resistance — this is what EN74/BS1139 certification assumes. Pressed couplers are stamped and welded, cheaper but weaker. For working scaffolds, always specify drop forged EN74 Class B.

How many couplers do I need for a typical scaffold?

A standard 100 m² facade bay consumes roughly 150–200 couplers (about 60% double, 20% swivel, 10% putlog, 5% sleeve plus beam clamps as required), depending on bracing density. Our engineers can draft a per-bay bill of materials from your drawings free of charge.

How do I verify coupler quality on delivery?

Check permanent marking (logo, EN74/BS1139, size) on every piece, thread cleanliness and high-tensile bolts, jaw forging quality with no cracks or cold shuts, uniform zinc coating, and a firm hammer fit on a 48.3 mm tube. Request third-party load test reports and mill test certificates with the batch.

What finish and packaging do you supply?

Couplers ship in poly bags of 50 with cartons and pallets to protect threads in transit, in hot-dip galvanized or zinc-plated finish. A 20-foot container holds roughly 2,000–2,500 couplers depending on type and packing.

Why Choose Sino East Steel Group

Sino East Steel Group (Tianjin, China) is a CE EN1090 & ISO 3834-2 certified scaffolding fittings manufacturer supplying drop forged EN74/BS1139 couplers to 50+ countries. Every shipment includes mill test certificates, third-party load test reports and batch traceability, with packaging that protects threads in transit. For a quotation with your type mix and quantity, email [email protected] or WhatsApp +86 186 2208 8833.