What board widths can the standard coupler accommodate?

The standard shelf supports 230 mm to 300 mm planks; the adjustable variant extends to 350 mm.

How many couplers per plank are recommended?

Use one coupler per 0.75 m of plank length; increase to one per 0.5 m under heavy loads.

Can I use these clamps on wooden walers?

Yes—ensure the waler flange does not exceed 48.3 mm thickness; use captive-bolt versions for better grip on timber.

Are these clamps compatible with Cuplock ledgers?

Absolutely. They snap onto 48.3 mm round ledgers and lock in place for tool-free assembly.

Where can I find part codes and torque specs?

Refer to pages 10–11 of the Avanza Brochure for full details, including torque recommendations (20 Nm) and CAD drawings.

What ladder stringer sizes do the clamps fit?

Standard clamps fit 40 mm–50 mm stringers; wide-body variants accommodate up to 60 mm.

Can I use these clamps on fiberglass ladders?

No—these MS clamps are designed for steel stringers only. For non-metal ladders, use non-marring strap-on clamps.

How many clamps are needed per ladder section?

Minimum two per section—one near the top and one mid-span—to prevent lateral movement.

Are swivel-base box clamps available?

Yes—our swivel-base variant allows up to 30° rotation, ideal for angled access points.

Where can I find detailed clamp specifications?

Refer to pages 12–13 of the Avanza Brochure for full dimensional drawings and load certificates.

Board Retaining Coupler: Strong and Secure Solutions for Scaffolding Systems

Board retaining couplers—also known as plank clamps or toe-board clamps—are specialized scaffolding fittings that secure working platforms, planks, and toe-boards to horizontal ledgers or walers. At Avanza Steel, our board retaining couplers are precision-drop forged from high-grade mild steel, hot-dip galvanized for corrosion resistance, and rigorously tested to a 15 kN load rating. They ensure platform stability, protect edge-working personnel, and integrate seamlessly with both H-frame and Cuplock systems.

What Is a Board Retaining Coupler?

A board retaining coupler clamps onto a scaffold ledger or waler flange and provides a ledge or lip to hold MS planks, jaali walkways, or timber boards in place. Unlike generic right-angle couplers, these units feature a lower “shelf” bracket that prevents boards from sliding off under load or vibration.

Key Advantages:

Enhanced Platform Safety
Prevents plank displacement under foot traffic and dynamic forces.
Quick, Tool-Free Installation
Snap-on design clips to a 48.3 mm flange and locks via an integrated M12 captive nut.
High Reuse Cycles
Hot-dip galvanized finish and precision threads endure 200+ assembly/disassembly cycles.
Universal Compatibility
Fits standard MS planks (230–300 mm width) and Jaali walkways (300–350 mm).

Technical Specifications

Attribute	Specification
Material	Drop-forged MS (IS 2062 Grade A)
Finish	Hot-dip galvanized per ASTM A153 (≥ 85 µm Zn)
Clamp Capacity	48.3 mm flange thickness
Board Width Supported	230–350 mm
Load Rating	15 kN static load (tested to BS EN 12811)
Bolt/Nut	M12 captive nut, Grade 8.8
Weight	550-600
Compliance	IS 2750, BS EN 12811, ISO 9001:2015

Applications & Use Cases

Temporary Working Platforms
Ensure planks remain in place under foot traffic and tool loads during façade works, painting, and glazing.
Edge Protection Systems

Secure toe-boards to prevent tools or debris from falling off elevated decks, enhancing site safety.
Industrial Maintenance Walkways

Attach mesh or perforated walkway boards in factories and refineries, providing non-slip surfaces.
Event Scaffolds & Grandstands

Rapid-deploy platforms for seating and staging where board stability is critical under dynamic loads.

Installation & Best Practices

Clamp Preparation
Inspect the clamp’s jaw and shelf for deformation; confirm the captive nut spins freely.
Attachment to Ledger
Snap the coupler over the 48.3 mm horizontal ledger or waler flange; ensure full engagement of the upper jaw.
Securing the Board
Position the board on the lower shelf; hand-tighten the M12 nut until the board is firmly clamped but not crushed.
Alignment & Spacing
Space clamps at ≤ 1 m intervals along the plank length; add extra clamps under heavy equipment or materials.
Inspection Before Use
After installation, apply a lateral force of 500 N to the board; no movement should occur.

Maintenance & Lifecycle

Post-Use Cleaning
Brush off cement and debris; rinse with clean water and dry.
Inspection Cycle
Every 50 uses, inspect the shelf for wear and the jaw faces for corrosion undercut.
Thread Care
Apply light machine oil to the captive nut thread to ensure smooth operation.
Storage
Hang clamps on dedicated racks in a covered area to prevent moisture ingress.

Avanza Steel recycles retired clamps in-house, aligning with our zero-waste manufacturing ethos.

Secure your working platforms with Avanza Steel’s reliable board retaining couplers:

👉 Download the full Product Brochure for detailed part codes, dimensional drawings, and load charts.

👉 Contact our team at avanzasteel@gmail.com or +91 33 4000 7575 to request a site-specific quote, arrange a factory tour, or schedule an on-site technical consultation.