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Leading Scaffolding Coupler Supplier in China

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.

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*60.3

-

48.3*60

48.3*60

60*60

60*76

48.3*76

48.3*76

76*76

86*89
48.3*60.3

48.3*89

89*89

-
60.3*60.3 60.3*60.3 - -
 
Sleeve/Joint Coupler Girder Coupler Putlog/Single Coupler Board Retaining Coupler Distance Coupler SK - Bjelke Klips Dobbelt Oppheng Klips Gravelock Ring Coupler
48.3*48.3 48.3*45 48.3*48.3 48.3*38 48.3*74 48.3 48.3*48.3 48.3 48.3
40*40 48.3*50 - 48.3*45 48.3*98 - - - -
- 48.3*55 - 38*38 - - - - -

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

 

Special-shaped Coupler

Drop Forged Double Coupler

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

 

1mm≤△2≤2mm, Fs,5% ≥15.0kN

 1mm≤△2≤2mm, Fs,5%=15.91kN

7.2.2

Failure force

Ff,5%/γR2 ≥30.0kN

 Ff,5%/γR2=50.63kN

Pass

Scaffolding Double Coupler Inspection Images

Drop Forged Swivel Coupler  Class “B”

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

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

 

1mm≤△2≤2mm, Fs,5% ≥15.0kN

Fs=30kN, △2˂1mm

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.
 

Swivel Coupler Inspection Image

Pressed Sleeve Coupler

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

Sleeve Coupler Inspection Image

Putlog / Wrapover Coupler

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

Putlog Coupler Inspection Image

Girder / Gravlock Coupler

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

Girder Coupler Inspection Image

Board Retaining Clamp

Summary of Results:

No.

Test Item

Test Method
1

Failure Force

With Reference to EN 74-1:2005

Test Results:
Test Item Test Result
1# 2# 3# 4# 5# 6#
Failure Force(kN) 42.84 38.89 43.60 42.91 40.79 29.8

Board Retaining Coupler Inspection Image

The following are the standard parts used in the scaffolding coupler: 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.

 
85-92

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

5

13-26
 
 
 
 
You can find different types of scaffolding coupler rivets as follows:

UK Drop Forged Scaffolding Coupler Rivet

American Scaffolding Coupler Rivet

UK Pressed Scaffolding Coupler Rivet

German Scaffolding Coupler Rivet

In This Page：

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 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.
 
Holland type：
 
Mainly used for scaffolding systems in Holland.
 
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&#176;-1050&#176;C, and undergo a one-time forging of 300-600KN to improve its structure and mechanical properties, improve product toughness and protect its strength.
 
 
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.
 

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.

Scaffolding 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.

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.

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.

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