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.

Box Type Ladder Clamps: Secure and Durable Solutions for Scaffolding Systems

Box-Type Ladder Clamps provide a safe, sturdy connection between ladders or stair units and scaffold frames, ensuring reliable vertical access on construction and maintenance sites. At Avanza Steel our clamps are precision drop-forged from high-grade mild steel, finished with industrial hot-dip galvanization, and load-tested to 15 kN. The ergonomic box-type design wraps completely around ladder stringers, delivering 360° support and vibration-free performance throughout hundreds of reuse cycles.

What Are Box-Type Ladder Clamps

A box-type ladder clamp is a four-sided coupler engineered to encase the side stringers of scaffold ladders or stair frames. Unlike standard single-jaw clamps, this design distributes load evenly around the ladder profile, preventing twist, slippage, and localized wear.

Key Advantages:

Complete Enclosure
Four-sided grip secures ladders without deformation of the stringers.
High Load Rating
Each clamp is tested to 15 kN, accommodating live loads and dynamic forces.
Rapid, Tool-Free Fit
Drop-forged body with captive bolts hand-tightens in under 20 seconds.
Durable Finish
Hot-dip galvanization (≥ 85 µm) resists corrosion in harsh environments.

Technical Specifications

Attribute	Specification
Finish	Hot-dip galvanized (ASTM A153; Zn ≥ 85 µm)
Material	Drop-forged MS per IS 2062 Grade A
Load Rating	15 kN per clamp (BS EN 74 tested)
Stringer Capacity	40 mm – 60 mm ladder stringers
Weight (each)	1.5 kg
Bolt/Nut	M12 captive nut and bolt, Grade 8.8
Compliance	IS 2750, BS EN 74, ISO 9001

Components & Variants

Standard Box-Type Ladder Clamp

Encases stringers up to 50 mm; ideal for most scaffold ladder profiles.
Wide-Body Variant

Fits up to 60 mm stringers; reinforced gussets on corners for extra rigidity.
Swivel-Base Box Clamp

Mounted on a swivel plate for angled ladder connections on complex access systems.
Integrated Spigot Option

Incorporates a spigot pin in the clamp body, allowing direct connection to tube-and-pin scaffold standards.

Applications & Use Cases

Scaffold Ladder Integration

Securely attach prefabricated ladder sections to H-frames or Cuplock standards, ensuring vibration-free climbs.
Staircase Stringer Fixing

Clamp MS stair stringers to scaffolding towers for rapid assembly of safe stair flights.
Temporary Access Platforms

Integrate ladder modules into mobile towers, facilitating multi-level access in warehouses and factories.
Industrial Maintenance Rigs

Use wide-body clamps to mount structural access ladders on piping racks and machinery skid frames.

Installation & Best Practices

Stringer Preparation
Ensure ladder stringers are free of debris and paint drips for full metal-to-metal contact.
Clamp Positioning
Open box clamp, position around the stringer, and align captive bolt holes.
Hand-Tightening
Engage M12 captive bolts by hand until flush; give a final quarter-turn per wing to seat the clamp.
Torque Verification
Optionally use a 12 mm torque driver set to 20 Nm to ensure uniform preload across all clamps.
Periodic Check
After initial use, verify no loosening has occurred; retighten bolts before sustained operations.

Maintenance & Lifecycle

After-Use Cleaning
Rinse off concrete splatter and grease; dry thoroughly to prevent flash rust.
Inspection Cycle
Every 50 climbs or 30 days, inspect for cracks in the drop-forged body and check zinc coating integrity.
Re-galvanization
For high-corrosion sites, a light cold-galv spray touch-up maintains protection between full re-dip cycles.
End-of-Life Recycling
All MS components are recyclable, aligning with Avanza Steel’s sustainability commitment.

Ensure secure, vibration-free ladder access with Avanza Steel’s precision Box-Type Ladder Clamps:

👉 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.