TS EN 74 Drop-Forged Scaffolding Couplers: Ø48×48 Right-Angle, Swivel, Girder & Sleeve Specs
Heavy-duty drop-forged carbon steel couplers (never thin pressed sheet) equipped with Grade 8.8 T-bolts and 21/22 mm collared hex nuts—covering right-angle, swivel, I-beam girder, sleeve, putlog, and toeboard connections.
Quick Engineering & Export Dispatch Summary
EN 74 Drop-Forged Couplers — Multi-Size Quantity & Live Tonnage Matrix
Enter piece quantities across one or multiple sizes below to calculate instant net kg/tonnage, 40HC/FTL load ratio, and add all selected sizes to your B2B quote list in one click.
| Photo | SKU Code | Component Description | Dimensions | Unit Weight | Qty | Total Weight |
|---|---|---|---|---|---|---|
| SM-A641-048048 | Forged Fixed Right-Angle Coupler | Ø48xØ48 | 1.1 kg |
|
55.0 kg | |
| SM-A642-048048 | Forged Swivel Coupler | Ø48xØ48 | 1.1 kg |
|
— | |
| SM-H643-048000 | Pin Coupler | Ø48 | 0.7 kg |
|
— | |
| SM-H644-048000 | Toeboard Retaining Coupler | Ø48 | 0.9 kg |
|
— | |
| SM-A645-048000 | Steel Girder Beam Coupler | Ø48 | 1.4 kg |
|
— | |
| SM-A646-048048 | External Sleeve Coupler | Ø48xØ48 | 1.0 kg |
|
— | |
| SM-A647-048000 | Single Putlog Coupler | Ø48 | 0.7 kg |
|
— | |
| SM-A653-048150 | Spigot Adapter with Clamp | Ø48 | 1.1 kg |
|
— |
Bundling, Forklift Stillage & Container Top-Up Specs
Bagged 25 per sack inside stackable SM-A661 sheet-steel crates (~1.15 tons gross), couplers ship inside H-Frame or Ringlock 40HC containers with zero incremental ocean freight.
Structural Engineering Details, Fleet Compatibility & Field Performance
Drop-Forged EN 74 Steel vs. Thin Pressed-Sheet Clamps
Cheap pressed-metal clamps deform when torqued with a scaffold spanner and slip under wind anchor tension or truss-beam shear. Weighing a full 1.1 kg, our drop-forged SM-A641 (90° right-angle) and SM-A642 (360° swivel) couplers wrap Ø48.3 mm tubes rigidly at 50 Nm torque without ear distortion.
Specialized Clamps: Girder (SM-A645), Sleeve (SM-A646) & Putlog (SM-A647)
Attach Ø48.3 mm tubes directly to structural I/H-beam flanges without drilling or welding using pairs of SM-A645 Forged Girder Couplers (1.4 kg); splice scaffold tubes end-to-end coaxially with SM-A646 Sleeve Couplers (1.1 kg); and secure secondary transom rails with SM-A647 Putlog Couplers (0.7 kg).
Why Wall Tie Anchors Always Require SM-A641 Right-Angle Couplers
Every SM-A631 wall tie pipe installed every 16–24 m² across a facade scaffold clamps to the inner vertical post via an SM-A641 right-angle coupler. Even a 1,000 m² facade lot consumes 65+ couplers, making bulk crate inventory essential for active contractors.
Need a Complete Scaffolding Package Instead of Standalone Parts?
1,000 m² Facade Project Lot
1,553 pcs · 12.86 Tons (12,856 kg)
1,500 m² Full 40HC / FTL Lot
2,340 pcs · 19.36 Tons (19,357 kg)
1,000 m² Industrial Ringlock
2,374 pcs · 18.69 Tons (18,689 kg)
2,500 m² High-Rise Facade Lot
3,973 pcs · 33.19 Tons (33,192 kg)
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Frequently Asked Engineering & Export Questions
What is the unit weight (kg) of EN 74 Drop-Forged Couplers and how is it palletized for bulk shipping?
When must we use SM-A641 Fixed Couplers vs. SM-A642 Swivel Couplers?
What spanner socket size fits your T-bolt flange nuts?
Why are SM-A645 Girder Couplers always installed in pairs?
Can importers order standalone crates of 1,000–10,000 forged couplers?
What are SM-H643 Pin Couplers and SM-H644 Toeboard Couplers?
Get Your Factory-Direct B2B Scaffolding BOM & Proforma Quote Today
Send your building dimensions or DWG drawings directly to co-founders İdris YAĞMAHAN (Architect), Celalettin YAĞMAHAN (Civil Engineer) & M. Furkan YAĞMAHAN (Interior Architect) for an itemized SM-series quotation.
- Same-day itemized BOM, net kg tonnage & 20DC / 40HC / FTL loading plan
- EN 12810-1 & EN 12811-1 structural calculation and CAD layout support
- Factory-direct bulk dispatch from Gebze – Dilovası OSB manufacturing hub
