What is the delivery time?

It depends on order quantity. Generally, the delivery time will be within 5 to 10 days.

How can we ensure the quality ?

1) Only qualified raw material with certification is acceptable. 2) Quality check is operated by hand. 3) Free scaffolding samples are always available. 4) Once quality problems occur, just sent us pics for confirmation, once confirmed, money or goods will be given as compensation.

What kind of international Certificate do you have?

SGS Test Report. TUV Test Report

Really competitive ! EK Scaffolding are near the origin of steel and we have big order amount, so we get relatively cheaper price of steel raw material. Low labor cost and near Shanghai sea port are also our advantages. And the most of all, "less profit but big turnover " is our perpetual business principle to be best China scaffolding coupler supplier.

Can your company supply products fully according to customers’ requirements?

EK has a full set of coupler mold design and scaffolding production equipment. As leading scaffolding supplier we have a strong technician team to support. Upon receiving the drawings provided by customers, we will discuss with our technicians to study of new moulds feasibilities of production facilities. If the quantity is considerable, we can fully meet customers’ specifications.

What is the quality of your products?

1.EK strictly follows the stipulations set by EN74/BS1139/EN1065/AS1576 standard. 2.EK Scaffolding has one whole set of quality inspection system starting from the entrance of raw materials and dispatch of finished materials.

What's your MOQ(minimum order quantity)?

No minimum order quantity, multiple production lines are produced at intervals, available at any time.

Leading Supplier of Scaffolding Coupler

Scaffold couplers, which are used to connect steel pipes when building scaffolds, and connectors between steel pipes and other structures, are widely used in various types of scaffolding projects. There are usually European standards and Japanese standards. EK as China leading scaffolding coupler supplier, focus on introducing European standard scaffold fasteners to meet the use of the following countries, Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

In This Page：

Scaffolding Coupler Types
Aluminum Scaffold Couplers Video
Why Choose EK Scaffolding Couplers
FAQ Of Scaffolding Coupler Products

Scaffolding Couplers Types

Right Angle Coupler (Double Coupler, Fixed Coupler). Most used in scaffolding. Swivel Coupler, which is the most flexible of the three common scaffolding couplers. Sleeve Coupler used for the butt joint connection of two scaffolding steel pipes, mainly vertical pipes, horizontal pipes, and diagonal braces.

According to British Standard, EN74-1:2005, Scaffold couplers can be divided into the following four types on the basis of usage scenarios:

Right Angle Coupler

Right Angle Coupler: also known as Double Coupler or Fixed Coupler, is usually used to fix pipe vertically and firmly, eliminating the possibility of the steel pipes slipping off. It relies on the friction between the coupler and the steel pipe to transfer the load. Such as the connection of the vertical rod and the large crossbar, the large crossbar and the small crossbar of scaffolding.

Swivel Coupler

Swivel Coupler: Used for cross-connection and fastening of two scaffolding steel pipes at any angle. Connects and fixes two components and can rotate flexibly to facilitate construction.

Parallel Coupler

Parallel Coupler: Used for fixing two parallel scaffolding steel pipes, mainly used for fastening fence.

Sleeve Coupler Sketch

Sleeve Coupler Sketch is usually used to connect two steel pipes firmly to make them one. Sleeve coupler sketch can make up for the shortcomings of a steel pipe too short.

According to the requirements and usage scenarios of different countries, scaffold couplers can be divided the following types:

Mainly used for scaffolding systems used in the UK and Commonwealth countries.

British type:

American type:

Mainly used in Scaffolding system of the United States.

German type：

Mainly used in German scaffolding system.

Italian type：

Mainly used for scaffolding systems in Italy.

Japanese, Korean type：

Mainly used for scaffolding systems in Japan & Korea.

According to different production processes, there are mainly the following three types:

Forged scaffolding couplers：This production process can lead to a result that the toughness of the scaffold coupler will be guaranteed while ensuring the strength. This is where forged scaffold coupler is superior to the pressed coupler and casting coupler. Use a high frequency electric furnace to heat the carbon structural steel of the corresponding specification to austenite state at 950°-1050°C, and undergo a one-time forging of 300-600KN to improve its structure and mechanical properties, improve product toughness and protect its strength.

Forged scaffolding couplers：

Pressed couplers：

Pressed couplers：Compared to forged coupler, pressed coupler has a price advantage and especially make up for some products vacancies that cannot be produced by forging process,Use Q235, Q355, SPHC and other grades of steel plates, processed into couplers that meet the requirements of BS EN74-1:2005 through cutting, mold forming, galvanizing, assembly and other processes. Compared with forged couplers, it has a certain price advantage, and it also makes up for the production gap that cannot be realized by some couplers forging technology.

Casting couplers：

Casting couplers：Even casting scaffold coupler has high hardness its shortcomings of poor toughness that cannot be overcome finally leads to a decline in market share year by year. Heat the copper and iron to a liquid state, pour it into a casting mold, cool it naturally, and then assembleIt has the characteristics of high production efficiency, fast production cycle and low cost. Due to the insurmountable characteristics of castings: high hardness but poor toughness, the market share is declining year by year.

According to the different surface treatments, it is divided into the following three categories:

1.Hot-dip galvanized couplers: After degreasing, pickling, dipping, and drying, the scaffold couplers are immersed in the molten zinc solution for a certain period of time and then taken out.

2.Electro-galvanized couplers: Electro-galvanized couplers are scaffold couplers that need to be processed by degreasing and pickling with electrolysis equipment, then put them into a solution of zinc salt, and then connect the negative electrode of the electrolysis equipment; Place a zinc plate on the opposite side of the piece and connect it to the positive electrode of the electrolysis device, turn on the power, and use the directional movement of the current from the positive electrode to the negative electrode to gradually deposit a layer of zinc on the surface of the coupler.
3.Hight Protected paint couplers: Spray paint is a coating method that is sprayed through a spray gun or a disc atomizer, dispersed into uniform and fine droplets by means of pressure or centrifugal force, and applied to the surface of the coupler.

The following are the standard parts used in the deduction: screw, nut, gasket and other information:

Common Type: T-Bolt, Eye Bolt, Spliting End Bolt. The diameters of the six common coupler bolts, the effective length of the bolts and the applicable countries are as follows:

CommonType：Hexagon nuts,wing nuts, flange nut.
According to the size of wrenches in different countries, the common coupler nut sizes are 19mm, 21mm, 22mm, and 23mm. Among them, 19mm nuts are generally used in scaffolding couplers in Japan, South Korea and some Southeast Asian countries, 21mm nuts are generally used in related couplers in the United Kingdom and Commonwealth countries, and 22mm nuts are suitable for scaffolding systems in the United States, Germany and some European countries. , And 23mm nuts are mainly used in Australia.

The bolt diameter and unit width and height of common hexagon nuts are shown in the following table:

Width across flats for hexagon nut, And Using Countries
Width	21	United Kingdom and the Commonwealth of Nations
Width	22	USA, Germany and some Eurupean countries
Width	23	Australia
Width	19	Japan, South Korea and some Southeast Asian countries

	Bolt Dia.	Width across flats	Height	Width across flats	Height	Width across flats	Height
Hexagon Nut	1/2"	S21	H11	S22	H11	S23	H11
Hexagon Nut		SF21	H14	SF22	H14	SF23	H14
Hexagon Nut		SF21	H19	SF22	H19	SF23	H119
Hexagon Nut		S21	H15
Hexagon Nut	M14	S22	H11	S23	H11
Hexagon Nut		SF22	H14	SF23	H14
Hexagon Nut		SF22	H19	SF23	H119
Hexagon Nut	M12	SF19	H9
Wing Nut	1/2

	Dia.	Effective length / Bolt length	Use
T-Bolt	1/2	75-88	United Kingdom and the Commonwealth of Nations
	M14	75-87	USA, Germany and some Eurupean countries
	M14	98-110	USA, Germany and some Eurupean countries
Eye Bolt	1/2	67-86	United Kingdom and the Commonwealth of Nations
	M12	57-73	United Kingdom and the Commonwealth of Nations
	M14	70-90	USA, Germany and some Eurupean countries
Spliting End Bolt	1/2	45-82	For Putlog coupler, BRC, etc.
Carriage Bolt	1/2	116-125	For tube external clamp, universal clamp, etc.
Carriage Bolt	1/2	85-92	For tube external clamp, universal clamp, etc.
Hexagon Bolt	M16	72-80	For Girder Coupler, DF Joint Pin
Flat T-Bolt	1/2	66-76	For Italian couplers

The thickness and inner/outer diameter of the washer are as follows:

Thickness

Inner / Outer Dia.

Washer

3.5

13-26

According to different usage scenarios and different sizes of copper pipes, the most commonly used coupler specifications are: 48.3*48.3. There are also some special specifications as shown in the following table:

According to different sizes

Double	Swivel Coupler
48.3*34	48.3*34	34*34	34*38
48.3*38	48.3*38	38*38	38*42
48.3*42	48.3*42	42*42	42*60
48.3*48.3	48.3*48.3	-	-
48.3*60	48.3*60	60*60	60*76
48.3*76	48.3*76	76*76	86*89
-	48.3*89	89*89	-

Our scaffolding coupler has obtained many international certificates, such as EN 74-1:2005 and EN 74-1:2005 Clause 7.4.3, etc.

Drop Forged Double Coupler

In test (Slipping Force)
In test (Failure Force)

Slipping Force: The first time the pressure is applied, when the pressure is greater than 10kN, the sliding distance of the scaffold steel pipe should be less than 7mm. The test result is: when the pressure is 10.6kN, the sliding distance of the steel pipe on the coupler is less than 7mm, which meets the standard requirements.
The second pressure is applied, when the pressure is greater than 15kN, the sliding distance of the steel pipe on the coupler should be between 1mm-2mm. The test result is: under a pressure of 30kN, the sliding distance of the second test is less than 1mm, which is consistent with Claim.

Failure Force：The bearing weight of the scaffolding coupler must reach 20KN. The test result: It can bear a weight of 24KN, and the destructive resistance of the coupler reaches the standard.

Summary of Results:

No.	Test Item	Test Method
1	Slipping Force	EN 74-1:2005
2	Failure Force	EN 74-1:2005

Test Results:

Test Clause	Test Item	Test Requirement	Test Result	Conclusion
7.2.1	Slipping force	△1≤7mm, Fs,5%≥10.0kN	△1=7mm, Fs,5%=15.88kN	Pass
7.2.1	Slipping force	1mm≤△2≤2mm, Fs,5% ≥15.0kN	1mm≤△2≤2mm, Fs,5%=15.91kN	Pass
7.2.2	Failure force	Ff,5%/γR2 ≥30.0kN	Ff,5%/γR2=50.63kN	Pass

Drop Forged Swivel Coupler Class “B”

Under normal circumstances, it is difficult to reach B grade, but we reached

In test (Slipping Force)
In test (Failure Force)

Summary of Results:

No.	Test Item	Test Method
1	Slipping Force	EN 74-1:2005
2	Failure Force	EN 74-1:2005

Test Results:

Test Clause	Test Item	Test Requirement (Swivel coupler, Class B)	Test Result	Conclusion
7.2.1	Slipping force	△1≤7mm, Fs,5%≥10.0kN	△1≤7mm, Fs,5%=10.6kN	Pass
7.2.1	Slipping force	1mm≤△2≤2mm, Fs,5% ≥15.0kN	Fs=30kN, △2˂1mm	Pass
7.2.2	Failure force	Ff,5%/γR2 ≥20.0kN	Ff,5%/γR2=24.4kN	Pass

Under normal circumstances, it is difficult to reach B grade, but we reached.

Pressed Sleeve Coupler

In test
After test

Summary of Results:

No.	Test Item	Test Method
1	Bending Moment Resistance	EN 74-1:2005 Clause 7.4.3
2	Slipping Force	EN 74-1:2005 Clause 7.2.1

Test Results:

Test Item

Test Result

Test Requirement

(Sleeve coupler, Class B)

Conclusion

Bending Moment Resistance

△4=5mm, Mb,5% =1.43kNm

△4=5mm, Mb,5% ≥1.4kNm

Pass

Putlog / Wrapover Coupler

In test
After test

Summary of Results:

No.	Test Item	Test Method
1	Slipping Resistance	BS 1139-2.2:2009+A1:2015 Clause 7 & Annex A.2

Test Results:

Test Item	Test Result	Test Requirement	Conclusion
Slipping Resistance	1mm≤△2≤2mm, Fs,5% =1.83kN	1mm≤△2≤2mm, Fs,5% ≥1.04kN	Pass

Girder / Gravlock Coupler

In test (Strength test)
In test (Slip test along tube)
In test (Slip test along tube a flange)

Summary of Results:

No.	Test Item	Test Method
1	Strength test	AS/NZS 1576.2:2016 Appendix L
2	Slip test along tube	AS/NZS 1576.2:2016 Appendix M
3	Slip test along tube a flange	AS/NZS 1576.2:2016 Appendix N

Test Results:

Test Clause	Test Item	Test Requirement	Test Result	Conclusion
Appendix L	Strength test	P=30.0kN, neither flange clamp shall show any permanent set	P=30.0kN, neither flange clamp showed any permanent set	Pass
Appendix M	Slip test along tube	P=12.5kN, Slippage ≤ 6mm	P=12.5kN, Slippage<6mm	Pass
Appendix N	Slip test along tube a flange	P=12.5kN, Slippage ≤ 6mm	P=12.5kN, Slippage<6mm	Pass

Board Retaining Clamp

In test
After test

Summary of Results:

No.	Test Item	Test Method
1	Failure Force	With Reference to EN 74-1:2005

Test Results:

Test Item	Test Result
Test Item	1#	3#	3#	4#	5#	Fp,5%/γR2
Failure Force(kN)	42.84	38.89	43.60	42.91	40.79	29.8

Aluminum Couplers manufacture

As scaffold coupler manufacturer in China, EK Scaffolding has advanced production equipment for forged couplers and pressed couplers，
All forged scaffolding coulpers use high-frequency electric furnace to heat different specifications of structural steel to 950-1050 austenite state, after 4000KN one-time forging can improver its organizational structure and mechanical properties, thereby improving the plasticity and mechanical properties of the product.

Aluminum Scaffolding Coupler Brochure

Here is brochure of EK scaffolding coupler products. You can see casting and special shaped coupler, pressed coupler, sleeve scaffold coupler and other realeted scaffold products from this brochure.

Name	Download
Scaffolding Coupler Brochure.pdf	Download

Why choose EK Scaffolding Couplers

EK Scaffolding company is a China scaffolding manufacturer that started with couplers. We have 14 years experience in this scaffold industry. Values of EK Scaffolding are professional service, quality assurance and fast delivery.

world's top coupler brand

World's top OEM coupler factory brand, forge and press scaffold coupler all international types

Large delivery

Over 60 containers per month, port of destination customs clearane, home delivery.

Efficient and convenient

L/C, T/T, D/P, forward payment, By Sea, by rail, road transport, Efficient and convenient.

high-grade accessories

All EK scaffold coupler use high-grade accessories, 8.8-grade high-strength screw.

FAQ Of Scaffolding Coupler Products

What is the delivery time?

It depends on order quantity. Generally, the delivery time will be within 5 to 10 days.
How can we ensure the quality ?

1) Only qualified raw material with certification is acceptable.
2) Quality check is operated by hand.
3) Free scaffolding samples are always available.
4) Once quality problems occur, just sent us pics for confirmation, once confirmed, money or goods will be given as compensation.
What kind of international Certificate do you have?

SGS Test Report.
TUV Test Report
How about the price?

Really competitive ! EK Scaffolding are near the origin of steel and we have big order amount, so we get relatively cheaper price of steel raw material. Low labor cost and near Shanghai sea port are also our advantages. And the most of all, "less profit but big turnover " is our perpetual business principle to be best China scaffolding coupler supplier.
Can your company supply products fully according to customers’ requirements?

EK has a full set of coupler mold design and scaffolding production equipment. As leading scaffolding supplier we have a strong technician team to support. Upon receiving the drawings provided by customers, we will discuss with our technicians to study of new moulds feasibilities of production facilities. If the quantity is considerable, we can fully meet customers’ specifications.
What is the quality of your products?

1.EK strictly follows the stipulations set by EN74/BS1139/EN1065/AS1576 standard.

2.EK Scaffolding has one whole set of quality inspection system starting from the entrance of raw materials and dispatch of finished materials.
What's your MOQ(minimum order quantity)?

No minimum order quantity, multiple production lines are produced at intervals, available at any time.