The BoSS Rung Span Frame is an aluminium end frame available in single-width (0.85m) and double-width (1.45m) options. It is designed to provide structural support, bracing, and stability for BoSS Ladderspan towers. Unlike traditional ladder frames with integrated climbing rungs, span frames feature horizontal rungs that ensure tower rigidity without serving as climbing rungs.
You can purchase these in 2-rung (1.0m), 3-rung (1.5m), and 4-rung (2.0m) configurations, offering flexible height adjustment. Paired with ladder frames, they create a secure, compliant end structure ideal for maintenance, construction, and painting work. Designed for reliability, stability and efficiency, the BoSS Rung Span Frame meets EN1004 standards, ensuring safe elevated access for professionals.
Key features
- Durable aluminium construction: Lightweight yet robust, the 0.85m frames weigh 2.7kg – 4.1kg, and the 1.45m frames weigh 4.0kg – 7.1kg (rung size dependent), ensuring easy transportation and long-lasting performance.
- Strong tube-to-tube design: Provides superior rigidity and stability to withstand heavy-duty loads.
- Height flexibility: Standard 500mm rung spacing for easy height adjustments.
- BoSS compatibility: Designed to integrate seamlessly with BoSS Ladderspan components for secure, professional tower builds.
- Portable & easy to store: Compact and lightweight for convenient transport and storage.
- Increased stability: The 1.45m frame offers extra stability for taller builds, while the 0.85m frame excels in tight spaces.
Product FAQs
What is the difference between a span frame and a ladder frame?
The span frame is a plain end frame without an integrated ladder. It is installed opposite the ladder frame, which includes built-in climbing rungs, to complete the tower structure.
What is the difference between the frame widths?
- 0.85m (Single-Width): Ideal for confined spaces, narrow work areas, and light-duty applications.
- 1.45m (Double-Width): Offers a wider working area and a higher load capacity, making it suitable for larger tasks that require extra stability.
How is this frame used in tower assembly?
It pairs with a corresponding ladder frame to form the base or extension levels of the tower. Castors and adjustable legs are typically fitted to the lower frames, with braces and platforms added for stability.
What are the exact dimensions of this product?
0.85m width
2-rung span (60251300)
- Open height: 1.09m.
- Width: 0.06m.
- Open length: 1.0m.
- Open depth: 0.92m.
3-rung span (60151300)
- Open height: 1.59m.
- Width: 0.06m.
- Open length: 1.5m.
- Open depth: 0.92m.
4-rung span (60051300)
- Open height: 2.09m.
- Width: 0.06m.
- Open length: 2.0m.
- Open depth: 0.92m.
1.45m width
2-rung ladder (60551300)
- Open height: 1.09m.
- Width: 0.06m.
- Open length: 1.0m.
- Open depth: 1.52m.
3-rung ladder (60451300)
- Open height: 1.59m.
- Width: 0.06m.
- Open length: 1.5m.
- Open depth: 1.52m.
4-rung ladder (60351300)
- Open height: 2.09m.
- Width: 0.06m.
- Open length: 2.0m.
- Open depth: 1.52m.
Do I need special tools to assemble it?
No special tools are required for the BoSS aluminium span frame; BoSS tower components use claw-and-pin connections for quick, tool-free assembly by competent persons.
What height options are available for both frames?
Both width frames are available in 2-rung (1.0m height), 3-rung (1.5m height), and 4-rung (2.0m height) configurations, providing flexibility for towers of different heights.
Why choose a span frame over a ladder frame for certain positions?
Span frames feature only horizontal rungs for optimal brace and platform support, with no climbing access. Positioning them opposite ladder frames (which have 250 mm-spaced vertical rungs) creates a safe internal climbing path while maximising structural integrity throughout the tower.
What assembly method should I use with this frame?
Follow the 3T (Through the Trapdoor) method: Climb internally through the trapdoor to install guardrails from the protected platform below before accessing the new level. This eliminates external climbing risks and aligns with PASMA best practices.
Do towers using BoSS span frames comply with industry standards?
Yes – when assembled correctly with genuine BoSS parts, the complete tower meets the requirements of EN 1004-1:2020, including updated platform spacing limits and enhanced stability testing for indoor/outdoor use.
What materials are they made of?
Both the 0.85m and 1.45m BoSS Rung Span Frames are constructed from high-quality aluminium, ensuring a lightweight yet durable design for professional use.
How do toe boards and guardrails integrate with this frame?
The toe boards clip directly to platform edges, while guardrails attach to the frame rungs at the required heights. The 500mm rung pitch ensures guardrails are correctly positioned to meet EN 1004-1:2020 side protection requirements at every working level.
Can this frame be used in bridged or linked tower configurations?
Yes, the span frame can be used for these configurations in approved advanced setups with compatible bridging beams, step-through frames, and additional bracing.
How much does each Rung Span weigh?
0.85m width Rung Span
- 2 Rung (60251300): Approximately 2.7kg.
- 3 Rung (60151300): Approximately 3.4kg.
- 4 Rung (60051300): Approximately 4.1kg.
1.45m width Rung Span
- 2 Rung (60551300): Approximately 4.0kg.
- 3 Rung (60451300): Approximately 5.6kg.
- 4 Rung (60351300): Approximately 7.1kg.
Q & A
BoSS Rung Span Frame Components
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