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EN 74 Right Angle Scaffolding Coupler - Forged Steel 48.3mm OD Pipe Fixing Clamp with Hot-dip Galvanized Finish

EN 74 Swivel Coupler - 360° Rotating Scaffold Clamp for Angle Adjustable Pipe Connections

Close-up of forged steel scaffolding coupler - showing grain structure and high-strength material for load resistance

Hot-dip galvanized scaffolding coupler - uniform zinc coating for rust-proof outdoor durability

Scaffolding coupler with internal anti-slip serrations - providing firm grip on 48.3mm steel tubes

Scaffolding Coupler

Keywords: swivel coupler, fixed coupler, right angle coupler, double coupler, girder coupler, gravlock coupler, beam clamp, putlog coupler, sleeve coupler, half coupler, board retaining coupler, ladder coupler
Dimensions: 48.3-48.3mm
Material: Q235 Carbon Steel
Weight: 0.95-1.05kg or as Per Your Request
Standard: EN74, BS1139, CE, and Also Fit For Our Domestic Standard, Through SGS Test
Techs: Drop Forged
Surface treatment: Self-Color, Zinc Plated, Hot Dip Galvanized
Color: Self-Color(Black) , White, Yellow
Packaging: In Bulk, In Bundle, In Pallet, or as requested


Availability:



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Scaffolding Couplers, also known as scaffold clamps or tube fittings, are essential connecting components in tube-and-coupler scaffolding systems. They serve to securely fasten steel scaffolding tubes together, forming stable structural frameworks for construction, maintenance, and industrial projects .

These couplers work by creating a friction-based clamping force around the scaffolding tubes, ensuring rigid connections that can withstand significant loads during use. Available in various configurations to suit different connection requirements, they are manufactured through drop forging or pressing processes using high-strength structural steel .

Main Types of Scaffolding Couplers:

Coupler Type	Function	Typical Use
Double Coupler (Right-Angle/Fixed)	Joins two tubes at a 90° angle	Connecting ledgers to standards; forming right-angle joints in scaffolding structures
Swivel Coupler	Joins two tubes at any angle	Diagonal bracing; connecting tubes at variable angles; adaptable connections
Sleeve Coupler	Joins two tubes end-to-end	Extending scaffolding tubes lengthwise; creating longer continuous runs
Putlog Coupler	Connects a tube to a flat surface or tube	Securing transoms to ledgers; non-load-bearing connections
Girder Coupler	Connects a tube to a steel beam/girder	Attaching scaffolding to structural steel beams; industrial applications
Board Retaining Coupler	Secures scaffold boards to ledgers	Holding platform boards in place; preventing displacement

Key Features:

Secure Friction Connection: Designed to clamp tightly onto 48.3mm OD scaffolding tubes (BS standard), creating a reliable friction grip that prevents slippage under load
High Strength & Durability: Drop forged couplers offer superior strength and toughness compared to pressed or cast versions, suitable for heavy-duty applications
Corrosion Protection: Available with hot-dip galvanized (HDG), electro-galvanized, or painted finishes to resist rust and extend service life in outdoor environments
Ease of Installation: Simple bolt-and-nut or wedge-based fastening mechanisms allow for quick assembly and disassembly on job sites
Interchangeability: Manufactured to international standards (BS EN 74, BS 1139) ensuring compatibility with standard scaffolding tubes and fittings worldwide

Applications:

Building and construction scaffolding systems
Industrial maintenance and repair access
Bridge and infrastructure projects
Shipbuilding and offshore facilities
Event staging and temporary structures
Façade access and restoration work

Scaffolding-Coupler

Parameter	Details
Product Name	Scaffolding Coupler / Scaffold Clamp / Tube Fitting
Applicable Pipe OD	BS Type: 48.3 mm; JIS Type: 48.6 mm; 60.3 mm (custom)
Material	Q235 / Q355 Structural Steel; S235GT Equivalent
Manufacturing Process	Drop Forged (higher strength), Pressed, Casting
Surface Treatment	Hot-Dip Galvanized (HDG), Electro-Galvanized, Spray Painted, Powder Coated
Compliance Standards	BS EN 74-1, BS 1139

Common Types & Weights (BS Type, 48.3mm):

Type	Process	Unit Weight (kg/pc)	Surface Finish
Double Coupler	Drop Forged	0.98 – 1.0 kg	HDG / Electro-Galvanized
Double Coupler	Pressed	0.80 – 0.85 kg	HDG / Electro-Galvanized
Swivel Coupler	Drop Forged	1.12 – 1.15 kg	HDG / Electro-Galvanized
Swivel Coupler	Pressed	0.98 – 1.0 kg	HDG / Electro-Galvanized
Girder Coupler	Drop Forged	1.45 – 1.50 kg	HDG / Electro-Galvanized
Putlog Coupler	Drop Forged	0.60 – 0.63 kg	HDG / Electro-Galvanized
Sleeve Coupler	Pressed	0.92 – 0.98 kg	HDG / Electro-Galvanized
Board Retaining	Drop Forged	0.60 – 0.63 kg	HDG / Electro-Galvanized

Scaffolding-Coupler-Specification

JIS type scaffolding coupler pressed coupler

Scaffolding Coupler is the main part of the tubular scaffolding system; it supplies a fastening and connection function in the system. Simple structure and big loading power make the coupler easier and more widely used by scaffolders on construction projects.

We have different types and sizes of scaffolding couplers, such as fixed couplers, swivel couplers, ladder beam couplers, and sleeve couplers.

Our Scaffolding Couplers are manufactured and tested in strict accordance with international standards to ensure quality, safety, and compatibility with scaffolding systems worldwide.

Primary International Standards:

Standard	Scope	Key Requirements
BS EN 74-1:2022+A1:2025	Couplers, spigot pins and baseplates for use in falsework and scaffolds - Couplers for tubes - Requirements and test procedures	Specifies materials, design requirements, strength classes, test procedures, and assessment methods for right-angle, swivel, sleeve, and parallel couplers working by friction
BS 1139	Specification for scaffolding tubes and couplers	UK standard defining dimensions, performance, and quality requirements for scaffolding tube fittings

Additional Applicable Standards:

Standard	Scope
EN 12811-1	Performance requirements for access and working scaffolds
EN 12812	Falsework - Performance requirements and design
JIS G3444	Carbon steel tubes for general structural purposes (Japan)
ASTM A53 / A53M	Standard specification for steel pipe (US)

Benefits of Tubular Scaffolding:

Easy To Use. These scaffolds are easy to use; only four basic components are required, such as a tube, right-angle coupler, swivel coupler, bases, or casters.
2. Durability. These types of scaffolds are durable, galvanized tubes and couplers that can take on harsh environments.
3. Ease in Assembly and Dismantling. Tubular scaffolds can be assembled easily and dismantled, saving time on site.
4. Light in Weight. The tubular system can be easily moved around the construction site.
5. Adaptability. In comparison to other scaffolds, the tube and fittings system offers the most adaptable and efficient scaffold solutions.
6. Cost Effectiveness. In cases when scaffolds need to be erected for long periods of time (more than four weeks), tube and fitting system scaffolds provide the most cost-effective scaffold solutions.
7. Flexibility. Tubular scaffolds are one of the most flexible types of scaffolds. These scaffolds can be adjusted according to the desired height.
8. Longer Life Span. Tubular system scaffolds have a longer life span in comparison to other scaffolds and offer more sturdy work platforms.

JIS Type Clamp
Description	Specification	Weight	Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.56kg	JIS Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.58kg	JIS Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.60kg	JIS Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.62kg	JIS Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.65kg	JIS Standard
110° Fixed /Swivel Clamp	48.6/60.5mm	0.66KG	JIS Standard

Q: What is the difference between a Double Coupler and a Swivel Coupler?
A: The choice depends on the angle of the scaffolding tubes you need to connect:

Double Coupler (Right Angle Coupler): Designed to connect two tubes at a strict 90-degree angle. It is primarily used to secure horizontal ledgers to vertical standards and bears the main structural load.
Swivel Coupler: Features two independent jaws that can rotate 360 degrees, allowing it to connect tubes at any angle. It is essential for diagonal bracing, cross-bracing, and complex geometric scaffolding structures.

Q: What manufacturing processes do you offer, and which is better?
A: We supply couplers manufactured through three main processes, tailored to different load requirements:

Drop Forged Couplers: Made by forging solid steel (Q235 or Q345). They offer the highest breaking strength and durability, making them the premium choice for heavy-duty and high-rise construction.
Pressed Steel Couplers: Manufactured by pressing steel plates into shape. They are highly cost-effective, lightweight, and perfectly suitable for standard light to medium-duty scaffolding systems.
Cast Iron Couplers: Traditional and economical, though generally heavier and more brittle than forged or pressed alternatives.

Q: Which international standards do your scaffolding couplers comply with?
A: Our couplers are manufactured and tested in strict accordance with global safety standards, including BS 1139 (UK), EN 74 (Europe), AS/NZS 1576.2 (Australia/NZ), and ANSI/OSHA (USA). We can supply specific regional types, such as British Type, German Type, Italian Type, and American Type couplers, ensuring perfect compatibility with your local scaffolding inventory.

Q: What surface treatments are available to prevent rust?
A: To ensure long-term durability in harsh outdoor construction environments, we offer premium surface finishes:

Hot-Dip Galvanized (HDG): Provides the ultimate corrosion resistance and lifespan, highly recommended for scaffolding rental companies and marine environments.
Electro-Galvanized (Cold Galvanized): Offers a smooth, bright finish at a lower cost, suitable for indoor or short-term projects.
Painted / Powder Coated: Available in safety yellow, red, or blue for high visibility and specific aesthetic requirements.

Q: Can you provide OEM services and custom branding?
A: Absolutely. As a direct manufacturer, we offer full OEM/ODM support. We can apply your company logo via casting, forging, or laser marking directly onto the coupler body. We also provide customized packaging (e.g., branded woven bags or pallets) to help you build your brand in the local market.