Quick answer: Scaffolding Couplers & Clamps from Sino East Steel — category: Scaffolding, supplied factory-direct from our mill in Tianjin. Standard: EN 12811, EN 39, BS 1139. Every shipment arrives with an EN 10204 3.1 mill test certificate. MOQ: 10-20 tons, lead time to Polish ports (Gdańsk, Gdynia, Szczecin): 15-25 days. Send sizes, grade and quantity for a quotation within 24 hours.
Scaffolding Couplers & Clamps
Scaffolding Couplers & Clamps — factory-direct products from Sino East Steel, one of China’s certified steel manufacturers serving Polish importers, distributors and contractors since 2005. We supply the full range of tube-and-fitting couplers for 48.3 mm scaffolding tube — swivel couplers, right-angle couplers, sleeve (joint) couplers and putlog couplers — manufactured to EN 74, hot-dip galvanized or electro-galvanized, and supplied with EN 10204 3.1 mill test certificates. Products are packed for sea freight to Gdansk, Gdynia, Szczecin and other Baltic and Northern European ports.
This page provides the full technical picture of our coupler range — types, sizes, load data, manufacturing background, quality assurance, packaging and ordering process — so your procurement team can evaluate the product without chasing data across multiple suppliers. For an exact quotation matching your required coupler mix and quantities, contact our export office; a confirmed price and delivery schedule are normally provided within 24 hours.
Key Specifications at a Glance
| Parameter | Value |
|---|---|
| Product Types | Swivel / Right-angle / Sleeve / Putlog couplers |
| Tube Diameter | 48.3 mm (42.4 mm available) |
| Material | Ductile iron (GGG) or pressed steel |
| Surface | Hot-dip galvanized (HDG) |
| Standards | EN 74-1 / EN 74-2 |
| Certification | EN 10204 3.1 MTC |
| Minimum Order Quantity (MOQ) | 10-20 tons |
| Lead Time | 15-25 days |
| Payment Terms | T/T, L/C |
Available Types & Load Ratings
| Type | Connection | Typical Slip Load |
|---|---|---|
| Swivel coupler | two tubes at any angle | ≥ 6.3 kN |
| Right-angle coupler | tubes at 90° | ≥ 9.0 kN |
| Sleeve coupler (muft) | in-line tube joint | ≥ 9.0 kN |
| Putlog coupler | putlog to ledger | ≥ 6.3 kN |
Standards & Compliance
All couplers are manufactured and tested to EN 74-1 (couplers for working scaffolds) and EN 74-2 (special couplers), with bolt torques and slip-load requirements verified on a calibrated test rig. Galvanizing is performed to EN ISO 1461 (hot-dip) or EN ISO 4042 (electro), ensuring corrosion resistance for outdoor and rental use.
Typical Applications
- Tube-and-fitting scaffolds for complex geometry and repairs
- Connecting ledgers, transoms and braces on 48.3 mm tube
- Extending tube runs with sleeve couplers
- Retrofit and repair of existing scaffold structures
- Rental fleets and maintenance stock for contractors
Quality Assurance & Testing
Manufacturing runs under an ISO 9001:2015 certified quality system. Couplers are tested for slip and deformation resistance per EN 74 requirements; each batch includes chemical and hardness verification of castings. Every shipment includes an EN 10204 3.1 Mill Test Certificate, and third-party inspection by SGS, TUV, BV or Intertek can be arranged at the buyer’s request.
Packing & Delivery
Couplers are packed in poly-woven bags on pallets (standard export packing) or in steel crates for large volumes. Production takes 15-25 days, followed by sea freight to Gdańsk, Gdynia or Szczecin, with door-to-door (DDP) options available for container shipments.
How to Order
- Send your inquiry: coupler types, quantities, surface finish and destination port.
- Receive a quotation within 24 hours with current factory pricing and delivery schedule.
- Confirm the order: 30% T/T deposit, 70% before shipment, or L/C at sight.
- Production and optional third-party inspection (15-25 days).
- Shipment with full documentation: invoice, packing list, B/L, MTC, certificate of origin.
Frequently Asked Questions
What coupler types do you supply? Swivel, right-angle, sleeve (joint) and putlog couplers for 48.3 mm tube, in ductile iron or pressed steel, galvanized hot-dip or electro.
Are the couplers EN 74 certified? Yes. All couplers are manufactured and tested to EN 74-1 / EN 74-2 with slip-load verification on calibrated test rigs.
Can we order mixed coupler types in one container? Yes. Mixed-type container loading is welcome for distributor orders, and we can optimize the packing mix to your fleet requirements.
Scaffolding Couplers — Types and Specifications
| Coupler Type | Application | Standard / Material |
|---|---|---|
| Fixed (right-angle) coupler | Connects tubes at 90° — standard / ledger to transom joints | EN 74 class B, drop-forged steel |
| Swivel coupler | Connects tubes at any angle — diagonals and braces | EN 74 class B, drop-forged steel |
| Sleeve / joint pin coupler | Extends tube in-line — standards and long runs | EN 74, steel tube sleeve |
| Putlog coupler | Fixes putlog/transom to ledger without damaging the tube | EN 74, drop-forged |
| Tube size | 48.3 mm OD standard; 42.4 mm available on request | — |
Couplers are the connection hardware that holds traditional tube-and-fitting scaffolding together. Ours are drop-forged from low-alloy steel, heat-treated, and fitted with high-tensile bolts and nuts that meet EN 74 class B slip and strength requirements. Every coupler is checked for torque performance and load capacity before packing, because a coupler failure is a safety event, not a supply event.
Technical Features of Our Couplers
- Drop-forged body — grain flow follows the load path, giving fatigue resistance far beyond cast equivalents.
- EN 74 class B performance — verified slip resistance and tensile capacity; test certificates available on request.
- High-tensile fasteners — grade 8.8 bolts and nuts with captive washers that do not drop out during erection.
- Hot-dip galvanized — EN ISO 1461 finish for outdoor service; a lighter electro-galvanized option is available for indoor and event use.
Applications
Couplers are used in traditional tube-and-fitting scaffolding, independent ties, guard rail extensions, temporary barriers, storage racks, exhibition structures and maintenance access on steelwork. Polish scaffolding companies use them alongside modular systems for ties, bracing and non-standard geometry where prefabricated nodes cannot reach. Bulk orders for rental fleets and distributors are supplied with mixed-type packing per your pick-list.
Quality Assurance and Certification
Couplers are batch-tested for slip load, ultimate load and bolt torque in accordance with EN 74-1. Shipments include EN 10204 3.1 mill certificates and test documentation; sample couplers can be sent for your own verification before mass production.
Packing, Delivery and Ordering
Couplers are packed in bulk bags, cartons or pallets by type, shipped to Polish and Baltic ports in 15–25 days. MOQ from 500 pieces; T/T or L/C. We also supply couplers matched to 42.4 mm, 48.3 mm and 60.3 mm tube on request.
Frequently Asked Questions
What bolt torque is required for your couplers?
Standard tightening torque for EN 74 class B couplers is 50 N·m (37 lbf·ft); a torque wrench is recommended for critical connections.
Do you provide test certificates for couplers?
Yes — batch test certificates covering slip load and ultimate load per EN 74 are included with shipments, and EN 10204 3.1 certificates on request.
Can you supply mixed coupler types in one shipment?
Yes — we pack per your pick-list (fixed / swivel / sleeve ratios) so your fleet stock arrives balanced.
Component Maintenance and Service Life
Hot-dip galvanized scaffolding components are designed for decades of service with minimal upkeep. After each project, clean components of mortar and concrete residue, stack them by type on timber battens, and store them off bare ground so the zinc layer is not damaged. Where the coating is scratched through to the steel, touch up with zinc-rich paint before the next erection cycle. Rotating stock evenly and keeping one spare set of wedges or blades per 1,000 components keeps a rental fleet productive for 15–20 years — the same discipline that Polish rental companies apply to their own fleets.
Load Classes and Configuration Notes
Scaffolding configurations are classified by load class according to EN 12811-1. Load class 3 (2.0 kN/m² distributed load) covers most facade renovation and finishing work; load class 4 (3.0 kN/m²) is used where materials are stacked on platforms; load classes 5–6 apply to heavy industrial and shoring duty. When you order a system, we confirm the load class with the bay layout, lift height and tie-in pattern, and provide the corresponding load tables. All systems can be configured as independent towers, facade scaffolds, birdcage supports or shoring structures simply by changing ledgers, transoms and ties — the same component pool covers all of them.
Why Buy Direct from Sino East Steel
Sino East Steel is a steel producer, not a trader: tubes for scaffolding components are rolled in our own mills, which gives us direct control over chemistry, wall thickness and surface quality, and keeps pricing at mill level. Since 2005 we have supplied Polish importers, distributors and contractors, and we maintain a bilingual (English / Polish) export team that prepares customs, certificates and shipping documentation from one source. Every order includes EN 10204 3.1 mill certificates, and for EU buyers we provide the technical file support needed for CE marking and EN 12811 compliance reviews.
Request a Quotation
To receive a factory-direct quotation, send your required component list (or facade area and working height), target port and quantity via the contact form, WhatsApp +86-186-2208-8833 or email [email protected]. Our export office responds within 24 hours with prices, load tables and a delivery schedule.
Component Lists for Complete Sets
When you order a complete system set, the quantity list is calculated from three inputs: the facade area to be covered, the working height, and the load class. For a typical 1.2 x 2.0 m bay at 2.0 m lift height, a rough rule of thumb is 2.0–2.5 m of standard per square metre of facade, 0.5 ledgers per square metre per lift, plus transoms, boards, base jacks and ties proportionally. We prepare the exact list from your drawings or measurements, so the set arrives balanced — enough standards to reach the top, enough ledgers for every lift, and the right number of boards, guard rails and toe boards for every platform level. Spare wedges, blades and pins are added at 1–2% of the component count, which is the practical allowance rental fleets use to cover loss and damage.
Erection and Dismantling Practices
Whichever system you choose, safe erection follows the same sequence: level the base with jacks, erect the first bay and fit ledgers and diagonals immediately, check plumb and level, then build lift by lift with guard rails and toe boards fitted before anyone works at the new level. Ties are installed at the spacing given in the load tables — typically every 4–6 m of horizontal length and every 2–3 lifts vertically, or closer where wind exposure is high. During dismantling, components should be lowered rather than thrown, and the scaffold should be inspected after any storm, impact or load change. Our documentation package includes an erection checklist that site teams can use directly.
Transport and Storage
Galvanized scaffolding components transport and store efficiently because they are stackable and do not require weather protection beyond basic precautions. For container loading, standards and ledgers are bundled by length with steel strapping and timber dunnage; boards and frames are palletized; small items (couplers, wedges, bolts) travel in bulk bags or cartons. On site, keep components on timber battens off the ground, sorted by type, and cover bundles if they will sit through winter weather. With this routine, a set retains full load capacity and appearance for 15–20 years of rental service — which is why galvanized systems remain the standard for professional fleets in Poland and across the EU.
Compliance and Documentation for EU Buyers
For buyers in Poland and the EU, we provide the technical documentation needed to satisfy CE marking requirements and EN 12811-1 conformity reviews: design basis and load tables for each system, material certificates (EN 10204 3.1) covering tube chemistry and mechanical properties, galvanizing certificates to EN ISO 1461, and weld inspection documentation. Where the scaffold is supplied as a complete system for sale to end users, the declaration of performance and technical file can be prepared from the same documentation set. Our export team is familiar with Polish customs procedures for steel products, including the documentation required for EU safeguard measures and import controls, and will prepare the shipping documents accordingly.
Working with Sino East Steel on Your First Order
Starting a relationship with a new supplier should be low-risk. On your first order we can agree a pre-production sample batch (for couplers, jacks or small components), arrange third-party inspection (SGS or similar) before shipment at your cost, and split a container shipment if you want to test the market with a smaller volume first. Payment by T/T with deposit and balance against shipping documents, or by irrevocable L/C, both work. After the first order, repeat orders benefit from fixed price windows of 30–90 days and reserved production slots, so your rental or construction schedule is not exposed to price swings.
Selection Support and After-Sales
Choosing between systems and sizing the set is easier with an engineer on the other end of the line. Our export team includes engineers who work daily with Polish and EU contractors, so we can recommend the system, calculate quantities, confirm load classes and review your tie-in pattern before production. After delivery, we support the first erection with remote guidance, provide spare parts and additional components from the same production batch codes, and can adjust a repeat order to match what your site actually consumed. You are not buying components from a catalogue — you are getting a configured system with engineering backup behind it.
