EK Scaffolding is a leading Chinese manufacturer and global exporter of high-quality scaffolding couplers and fittings. Built with premium Q235 and Q355 steel, our product range includes drop forged coupler, pressed coupler, and cast iron couplers engineered to meet strict international standards, including BS1139, EN74 (Class A & B), and JIS.
With thousands of containers shipped worldwide to over 30 countries—including the UK, Germany, France, Norway, Australia, and across Europe—we supply high-durability right angle coupler, swivel coupler, putlog coupler, beam coupler, board retaining coupler, and sleeve couplers.
| 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 | - | - | - | - | - |
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 |
| Item | Drop Forged Right Angle Coupler | Cold Pressed Right Angle Coupler |
| Manufactur Process | Drop Forged | Cold Pressed |
| Material | High-quality Q235 / Q355 carbon structural steel | High-quality Q235 steel plate |
| Pipe (OD) | Ø48.3 mm (standard 1.9" scaffolding steel tube) | Ø48.3 mm (standard 1.9" scaffolding steel tube) |
| Standard | BS1139 / EN74 Class B / JIS | BS1139 / EN74 Class A / JIS |
| Bolt Specification | T-bolt M12 / M14 × 88 mm | Eye Bolt M12 × 85 mm |
| Nut Specification | 21mm Flange Nut (1/2" BSW) / 22mm / 23mm | 21mm / 22mm hex nut |
| Bolt Grade | Available in Grade 4.8 or Grade 8.8 high-strength options. | Grade 4.8 / Grade 8.8 available |
| Weight | 1.00 – 1.15 kg/piece | 0.85 - 0.95 kg / piece |
| Slip Resistance | ≥ 15.0 kN (Complies with EN74 Class B standard) | ≥ 10.0 kN (Complies with EN74 Class A standard) |
| Ultimate Load | ≥ 30.0kN | ≥ 20.0kN |
| Surface Treatment | Electro-Galvanized) / HDG | Electro-Galvanized / HDG |
| MOQ | 1,000 pcs | 2,000 pcs |
| Packaging | 25 pieces/woven bag, 1,000 pieces/steel pallet | 30 pieces/woven bag, 1,200 pieces/wooden pallet |
| Application | Heavy-duty steel pipe scaffolding, high-rise buildings, petrochemical industry, large-scale bridges | Standard civil buildings, masonry scaffolding, light-duty construction |
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
|
| 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 |
| Item | Drop Forged Swivel Coupler | Pressed Swivel Coupler |
| Manufacturing Process | 360° Drop-Forged + Central Swivel Pin | Cold Stamping + Rotary Riveting |
| Material | High-quality Q235B / Q355B structural steel | High-quality Q235 steel plate |
| Pipe OD | Ø48.3 mm (standard 1.9" scaffolding steel tube) | Ø48.3 mm (standard 1.9" scaffolding steel tube) |
| Swivel Angle | 360-degree free rotation with no blind spots | 360-degree free rotation with no blind spots |
| Thickness | ≥4.0 – 4.5 mm (High-rigidity cover plate) | ≥3.0 - 3.5 mm |
| Standard | EN74-1 Class B / Class A / BS1139 / AS/NZS 1576.2 | BS1139 / EN74 Class A |
| Center Pin | Ø16 mm – Ø18 mm High-strength solid forged rivets | Ø14 mm – Ø16 mm High-strength carbon steel rivets |
| Bolt Spec | T-Bolt M12 / M14 × 88 mm | Eye Bolt M12 × 85 mm |
| Nut Spec | 21mm (1/2" BSW) / 22mm / 23mm (Australian Standard) | 21mm / 22mm Hex Nut |
| Unit Weight | 1.10 kg – 1.25 kg/piece (standard weight 1.15 kg) | 0.90 kg – 1.00 kg/piece |
| Slip Resistance | ≥15.0 kN (Complies with Class B standards) | ≥10.0 kN (Complies with Class A standards) |
| Failure Load | ≥28.0 - 30.0kN | ≥20.0kN |
| Surface treatment | Electro-Galvanized) / HDG | Electro-Galvanized / HDG |
| MOQ | 1000 pcs | 2000 pcs |
| Packaging | 25 pieces/woven bag, 1,000 pieces/steel pallet | 30 pieces/woven bag, 1,200 pieces/wooden pallet |
| Application | Diagonal braces, curved or irregularly shaped scaffolding, shipbuilding, and petrochemical industries. | Temporary edge protection railings, diagonal bracing, and event stage setup. |
Difference Between Right-Angle Coupler and Swivel Couplers:
Right-Angle Coupler (Right Angle / Double): Secures a fixed 90° intersection; primarily used to connect main load-bearing members (standards and ledgers).
Swivel Coupler: Allows for 360° rotation; specifically designed to connect diagonal bracing tubes, ensuring the lateral stability of the overall scaffolding structure.
Safety Note Regarding the Center Pin:
The performance of a swivel coupler hinges on its central rotating rivet. Forged swivel couplers utilize large-diameter (Ø16mm/Ø18mm) hot-forged rivets that resist loosening or breakage under high tensile loads, ensuring compliance with EN74-1 Class B safety standards.
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 |
| Item | Pressed Steel Sleeve Coupler / Joint Clamp | Cast / Forged Sleeve Coupler |
| Manufacturing Process | High-quality Cold Pressed | Cast or Drop-Forged |
| Material | High-quality Q235 carbon steel plate (thickness ≥ 3.5–4.0 mm) | Malleable iron or Q235B forged steel |
| Pipe OD | Ø48.3 mm (standard 1.9" scaffolding steel tube) | Ø48.3 mm (standard 1.9" scaffolding steel tube) |
| Connection Method | External End-to-End Joint | External End-to-End Joint |
| Overall Length | 200 mm – 210 mm | 200 mm - 210 mm |
| Standard | EN74-1 Class A / BS1139 / AS/NZS 1576.2 | EN74-1 / BS1139 Standard |
| Bolt Spec | Central long bolt M12/M14 × 75 mm or M12 × 80 mm | Center Hex Bolt M12 / M14 × 75 mm |
| Nut Spec | 21mm (1/2" BSW) / 22mm / 23mm (Australian Standard) | 21mm/22mm hex nut |
| Unit Weight | 0.95 kg – 1.05 kg/piece (standard weight 1.00 kg) | 1.10 kg – 1.25 kg/piece |
| Tensile Load | ≥6.0 kN (Complies with EN 74-1 tensile strength requirements for couplers) | ≥6.0 - 9.0 kN |
| Ultimate Load | ≥15.0kN | ≥18.0kN |
| Surface treatment | Electro-Galvanized / HDG | Electro-Galvanized / HDG |
| MOQ | 1000 pcs | 1000 pcs |
| Packaging | 20 pieces/woven bag, 1,000 pieces/steel pallet | 20 pieces/woven bag, 1,000 pieces/steel pallet |
| Top Markets | The UK, Ireland, New Zealand, Australia, Malaysia | Parts of Europe, Oil and gas projects in the Middle East |
Differences between Sleeve Couplers and Joint Pins:
Sleeve Coupler (External Connection): Wraps around the exterior of the steel tube and is secured with bolts; offers superior resistance to bending and tension, serving as the standard external connecting component compliant with EN74 / BS1139 specifications.
Joint Pin (Internal Connection): Inserts into the interior of the steel tube and expands to secure the connection; primarily used for internal joining, though its resistance to bending moments is lower than that of the sleeve coupler.
Nut and Tool Compatibility:
UK & Ireland: Standardized with 21mm (1/2" BSW) nuts.
Australia & New Zealand: 23mm nuts are recommended; hot-dip galvanizing (HDG) is mandatory to ensure durability for outdoor use in coastal environments.
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 |
| Name | Pressed Steel Putlog / Wrapover Coupler | Drop Forged Putlog Coupler |
| Manufacturing Process | High-quality cold stamping (Cold Pressed) | Hot Die-Forged Cover Plate/Base |
| Material | High-quality Q235 carbon structural steel plate | High-quality Q235B / Q355B forged steel |
| Pipe OD | Ø48.3 mm (standard 1.9" scaffolding steel tube) | Ø48.3 mm (standard 1.9" scaffolding steel tube) |
| Type | Wrapover Single Clamp | Forged Single Clamp |
| Thickness | ≥3.0 - 3.5mm | ≥4.0mm |
| Standard | BS1139 Standard / EN74 | BS1139 / EN74 Standard |
| Bolt Spec | T-bolt M12×85 mm or M12×88 mm | T-bolt M12 × 88 mm |
| Nut Spec | 21mm (1/2" BSW) / 22mm / 23mm (Australian Standard) | 21mm/22mm/23mm |
| Unit Weight | 0.60 kg – 0.70 kg/piece (standard weight 0.63 kg) | 0.68 kg - 0.75 kg/ piece |
| Slip Resistance | ≥0.63 kN (Complies with BS1139 standard for non-load-bearing single couplers) | ≥1.0kN |
| Surface Treatment | Electro-Galvanized / HDG | Electro-Galvanized / HDG |
| MOQ | 2000 pcs | 1000 pcs |
| Packaging | 35 pieces/woven bag, 1,400 pieces/steel pallet | 30 pieces/woven bag, 1,200 pieces/steel pallet |
| Top Markets | The UK, Australia, South America, Vietnam, South Africa | UK, Middle East oil and gas engineering, Europe |
Core Applications and Limitations of Putlog Couplers:
Primary Use: Specifically designed to secure putlogs (transoms) to ledgers to support scaffold boards, or to secure guardrails.
Safety Warning (Non-load-bearing coupler): Putlog couplers feature a single-clamp design; they are strictly prohibited for use in the primary load-bearing connections between standards (verticals) and ledgers (horizontals). Right-angle (double) couplers must be used for primary load-bearing joints.
Market Preferences and Nut Specifications:
UK & Ireland: High demand (putlog transoms are widely used in standard scaffolding erection); universally equipped with 21mm (1/2" BSW) flange nuts.
Australia & New Zealand: Compatible with 23mm nuts; hot-dip galvanized (HDG) finish is commonly required.
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 |
| Name | Drop Forged Gravlock / Girder Coupler | Cast / Pressed Steel Beam Clamp |
| Manufacturing Process | Heavy-Duty Drop Forging (One-Piece) | Casting (Malleable Iron / Cast Steel) or Composite Stamping |
| Material | High-quality Q235B / Q355B / 45# high-strength carbon steel | High-toughness malleable iron or Q235 steel |
| Pipe OD | Ø48.3 mm (standard 1.9" scaffolding steel tube) | Ø48.3 mm (standard 1.9" scaffolding steel tube) |
| Clampable Flange Thickness | Maximum clamping capacity: 45 mm | Maximum clamping capacity: 35 mm – 40 mm |
| Design Structural Configuration | Must be used in pairs | Must be used in pairs |
| Standard | EN74 Standard / BS1139 / AS/NZS 1576.2 | BS1139 Standard / AS 1576 |
| Bolt Spec | Grade 8.8 High-Strength Bolt M16×90 mm (High Clamping Force) | Grade 8.8/4.8 Bolts M14 / M16 × 85 mm |
| Nut Spec | 23mm/24mm Heavy-duty Hex Nut (7/8" / 22.2mm ANSI Standard Optional) | 21mm/22mm/23mm Hex Nut |
| Unit Weight | 1.40 kg – 1.50 kg/piece (standard weight 1.45 kg) | 1.20 kg – 1.35 kg / piece |
| Safe Working Load (SWL) | Slip Load: 10.0 kN/pair; Pull-out Load: 30.0 kN/pair | Sliding load: 6.5 - 8.0 kN/pair; Pull-out load: 20.0 kN/pair |
| Surface Treatment | Electro-Galvanized / HDG | Electro-Galvanized / HDG |
| MOQ | 500 pieces (or 250 pairs) | 1,000 pcs |
| Packaging | 15 pieces/carton, 600 pieces/steel pallet | 20 pieces/woven bag, 800 pieces/wooden pallet |
| Top Markets | The United States, Canada, the United Kingdom, Singapore, the United Arab Emirates, and Brazil | Conventional construction projects in Southeast Asia and the Middle East |
Critical Safety Warning — Must Be Used in Pairs:
During installation, girder couplers (Gravlock) must be fitted symmetrically in pairs on the opposing flanges of the I-beam to ensure balanced load distribution. Single-sided use is strictly prohibited.
Bolt and Nut Specifications by Market:
North American Market (US & Canada): High demand (due to the prevalence of high-rise steel structures); typically specified with 7/8" (22.2 mm) heavy-duty nuts to allow workers to use electric impact wrenches directly during installation.
UK, Middle East, and Singapore: Standard configuration involves M16 high-strength bolts with 23 mm or 24 mm nuts; large-scale oil and gas platform projects mandate a hot-dip galvanized (HDG) finish.
In test
After test
Summary of Results:
| No. | Test Item | Test Method |
| 1 | Failure Force | With Reference to EN 74-1:2005 |
| 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 |
| Specifications | Pressed Board Retaining Clamp (BRC) | Forged Heavy-Duty Board Retaining Clamp |
| Product Name (English) | Pressed Steel Board Retaining Clamp / BRC Clamp | Drop Forged Board Retaining Clamp |
| Manufacturing Process | Precision Cold Pressing / Stamping | Hot Die-Forged Head + Stamped Plate Assembly |
| Material | High-quality Q235 Carbon Steel (Thickness ≥3.5–4.0 mm) | High-quality Q235B/Q355B Forged Steel + Steel Plate |
| Applicable Pipe OD | Ø48.3 mm (Standard 1.9" Scaffolding Pipe) | Ø48.3 mm (Standard 1.9" Scaffolding Pipe) |
| Applicable Board Thickness | Fits 38 mm – 50 mm Wooden & Standard Metal Boards | Fits 38 mm – 50 mm Wooden & Heavy-Duty Metal Boards |
| Standards & Certification | BS1139 / EN74 | BS1139 / EN74 |
| Clamping Bolt Spec | Square Head Bolt (M10 / M12 × 70 mm) | Square Head / T-Bolt (M12 × 75 mm) |
| Nut Spec | 19 mm / 21 mm (1/2" BSW) Flange Nut | 21 mm / 22 mm Hex Nut |
| Unit Weight Range | 0.55 kg – 0.65 kg/pc (Standard: 0.60 kg) | 0.68 kg – 0.75 kg/pc |
| Holding Force | ≥1.5 – 2.0 kN (Prevents board uplift and sliding) | ≥2.5 kN |
| Surface Treatment | Electro-Galvanized / Hot-Dip Galvanized (HDG) | Electro-Galvanized / Hot-Dip Galvanized (HDG) |
| Minimum Order Quantity (MOQ) | 2,000 pcs | 1,000 pcs |
| Packaging | 40 pcs/woven bag, 1,500 pcs/steel pallet | 30 pcs/woven bag, 1,200 pcs/steel pallet |
| Top Markets | UK, Sweden, Finland, Norway, Ireland, Australia | UK, Nordic offshore engineering sector, Middle East |
| Market/Region | SEA & Middle East | UK & Europe | AU / NZ | USA / Canada |
| Standard | EN74 / BS1139 / JIS | EN74-1 / BS1139 | AS/NZS 1576.2 | OSHA / ANSI A10.8 |
| Bolt & Nut Specs | Eye Bolt / T-Bolt + 22mm (M14) Hex Nut | T-Bolt M12/M14 + 21mm (1/2" BSW) Flange Nut | T-Bolt M12/M14 + 23mm Flange Nut | M12/M14 Bolt + 7/8" (22.2mm) Heavy-Duty Hex Nut |
| Spanner/Tool | 22mm Metric Spanner | 21mm (7/16" Whitworth) Scaffolding Spanner | 23mm Spanner | 7/8" Imperial Spanner |
| Class | Class A / Class B available | Class B (High load-bearing, slip resistance ≥15kN) | Class B equivalent | Heavy-Duty |
| Common Surface Finish | Electro-Galvanized | Electro-Galvanized (EG) / Hot-Dip Galvanized (HDG) | Hot-Dip Galvanized (HDG) strongly preferred | Electro-Galvanized / Painted |
| Market Preferences / Pain Points | High emphasis on cost-performance and delivery times; large oil & gas projects in the Middle East mandate EN74 Class B, while standard civil construction favors 22mm nuts. | Class B certification is mandatory for the vast majority; requires EN74 markings and factory traceability codes. | Coastal climate necessitates high corrosion resistance (HDG); 23mm nut size specified (incompatible with the 21mm standard used in the UK/Europe). | Workers are accustomed to using 7/8-inch nuts (US standard) and electric impact wrenches; some projects prefer the use of heavy washers. |
Nut Dimensions & Spanner Size
Middle East and Southeast Asia: 22mm (M14) metric hex nuts are widely accepted.
UK and European markets: 21mm (1/2" BSW) flange nuts are strictly used. Scaffolding ratchet spanners carried by workers in Europe are exclusively 21mm.
Australian market: 23mm nuts are the standard. Shipping 21mm or 22mm nuts to Australia by mistake means workers cannot tighten them with their on-site tools, leading to bulk returns.
North American market: Imperial 7/8" (22.2mm) nuts are used.
| 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 |
|
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| Hexagon Nut | M14 | S22 | H11 | S23 | H11 |
|
|
| Hexagon Nut |
| SF22 | H14 | SF23 | H14 |
|
|
| Hexagon Nut |
| SF22 | H19 | SF23 | H119 |
|
|
| Hexagon Nut | M12 | SF19 | H9 |
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| Wing Nut | 1/2 |
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| 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 |
|
| Thickness | Inner / Outer Dia. |
|
Washer | 3.5 | 13-26 |
| 5 | 13-26 |
| Comparison Dimension | British Style Coupler Rivets | American Style Coupler Rivets | German Style Coupler Rivets |
| Main Standards | BS1139/EN74-1 Class B | OSHA/ANSI A10.8 | DIN4480/EN74-1 Class B |
| Hinge Pin Diameter | Ø8.0mm (Cold-headed carbon steel) | Ø9.5mm (3/8” design) | Ø8.0mm/Ø8.5mm (Precision hardened steel) |
| Swivel Pin | Ø16.0mm (Solid hot-forged/cold-headed) | Ø16.0mm/Ø19.0mm (3/4") | Ø16.0mm (Precision ground/with anti-wear washer) |
| Rivet Head Structure | Flat round flanged head | Large round/heavy thick flange | Precision countersunk/flush rivet head |
| Material & Treatment | Q235/45# Quenched & Tempered Steel | 45# High-strength carbon steel (High impact resistance) | Premium medium-carbon steel (Quenched & tempered; extremely high surface hardness) |
| Riveting Assembly Process | Hydraulic cold riveting; edge fully filled, no cracks | Pneumatic/mechanical heavy-duty press riveting (High-frequency vibration resistant) | High-precision automated hydraulic press riveting (Tight tolerances) |
| Galvanizing/Fit Clearance | Standard clearance for electro/hot-dip galvanizing | Larger clearance; suited for rough environments/painted finishes | Precision fit clearance (Typically smooth electro-galvanized finish) |
In-depth Breakdown of Key Differences
1. American-Style Rivets — Thick Shafts, Large Flanged Heads, Impact Resistance
Thick Shaft Design: North American construction sites frequently use electric impact wrenches to tighten bolts, generating immense instantaneous torque. Consequently, hinge pins on American-style couplers are often enlarged to 3/8" (approx. 9.5mm), while central swivel pins typically measure 3/4" (approx. 19mm).
Heavy Flanged Head: The riveted head is large and thick, preventing "pull-out" failure caused by the high-frequency vibration and intense tensile forces associated with electric impact tools.
2. German-Style Rivets — Precision Engineering, Flush/Countersunk Heads, Smooth Rotation
High-Precision Tolerances: German standards (DIN 4480 / EN74) demand exceptional flatness and fit. Rivet heads are typically flush or semi-countersunk, offering a sleek profile that minimizes the risk of snagging workers' clothing.
Swivel Pins with Anti-Friction Washers: German swivel couplers feature a hardened anti-friction metal washer at the central pivot point connecting the two halves; this ensures structural stability when tightened while providing consistent resistance (damping) during rotation.
3. British-Style Rivets — Universal Standards, Corrosion Resistance, Solid & Tough
Classic Ø8mm / Ø16mm Combination: British-style couplers (BS1139) represent the most widely used system globally. They utilize solid rivets with fixed diameters: Ø8.0mm for the cover plate pin and Ø16.0mm for the swivel pin.
Optimized Galvanizing Clearance: Hot-dip galvanizing (HDG) is standard practice in the UK and Commonwealth nations (e.g., Australia, New Zealand). British-style rivets are designed with precise clearance between the rivet and the coupler body hole to accommodate the galvanizing layer, ensuring smooth rotation without binding or excessive play (wobble).
Customized Rivet & Pin Solutions for Global Markets:
British / EU Style (BS1139/EN74): Standard Ø8mm hinge pins and Ø16mm solid swivel pins with smooth hydraulic flanged heads.
American Heavy-Duty Style: Upgraded 3/8" (9.5mm) hinge pins and 3/4" (19mm) swivel pins with heavy flange heads to withstand high-torque impact wrenches.
German Precision Style (DIN 4480): High-precision machined pins with flush/countersunk riveting and anti-friction washers for seamless 360° rotation.
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