Our Key Clamp Explainer Guide: Everything You Need To Know
Key clamp fittings are one of the most versatile and widely used components in construction, safety, and access applications. Whether you're a professional tradesperson specifying handrails for a commercial project, or a facilities manager looking to improve warehouse safety, understanding key clamps is essential for making the right choice.
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What Is a Key Clamp?
A key clamp is a cast iron or malleable iron fitting with a hot-dip galvanised finish, used to join galvanised steel tubes together without welding. Grub screws lock the fitting securely onto the tube, creating strong, rigid connections that can be assembled and disassembled without specialist tools or training.
First devised in the early 1900s, key clamps have become the go-to solution for constructing handrails, guardrails, barriers, racking, shelving, and a wide variety of other structures — both temporary and permanent.
You may encounter key clamps under a range of brand names including Kee Klamp and Interclamp — but regardless of the brand, they all perform the same function. At Lockinex, our key clamps are designed to deliver the same performance as premium brands at a significantly more competitive price.
Why Use Key Clamps?
- No welding required — connections are made with a simple Allen key, making installation fast and accessible to anyone on site
- Modular and reconfigurable — structures can be built, dismantled, transported, and rebuilt easily, reducing material costs and storage requirements
- Durable — hot-dip galvanised finish provides strong corrosion resistance and a long service life
- Versatile — suitable for indoor and outdoor use across a wide range of industries and applications
- Cost-effective — lower installation costs than welded alternatives, with minimal maintenance required over the lifetime of the structure
- Weather-resistant — suitable for the unpredictable UK climate, both galvanised steel and GRP options available
Types of Key Clamp
Key clamps are available in two primary material types:
Galvanised Steel Key Clamps The standard choice for most industrial, commercial, and construction applications. Hot-dip galvanised for corrosion resistance and long service life. Can be powder coated to any colour for aesthetic or high-visibility requirements — popular in restaurants, retail stores, theatres, and high-end environments.
GRP Key Clamps Glass Reinforced Plastic (GRP) key clamps with a yellow finish. Ideal for environments where corrosion resistance is critical — marine, chemical processing, rail, and outdoor coastal applications. Non-conductive, making them suitable where electrical safety is a concern.
Common Fitting Shapes
Key clamps are available in a wide range of shapes to suit any structural requirement:
- 90° Elbows — for right-angle corners
- Long Tees & Short Tees — for branching connections
- Crosses — for four-way junctions
- Base Plates — for floor-mounted post fixings
- Swivel Sockets — for angled connections on ramps and stairs
- End Caps — for safe termination of tube runs
- Handrail Brackets — for wall-mounted rail systems
Fittings are available in sizes to suit standard tube diameters — most commonly 33.7mm (1"), 42.4mm (1¼"), and 48.3mm (1½").
What Are Key Clamps Used For?
Industrial & Warehouse Safety
Factories and warehouses rely on key clamp systems to create safe pedestrian walkways, vehicle segregation barriers, and machine guarding. Their durability and ease of installation make them ideal for busy working environments where layouts may change over time.
Construction
On construction sites, key clamps are used to construct temporary and permanent handrails for access platforms, staircases, and safety barriers. Their modular nature means they can be reconfigured as the project evolves.
Handrails & Guardrails
Key clamps are the most common method for constructing
Public Spaces & Accessibility
Key clamps play a critical role in making public spaces inclusive and accessible. Ramp handrails, stepped access rails, and pedestrian barriers built with key clamps help facilities comply with the Equality Act 2010 and Building Regulations Part M, which mandate accessibility standards for public infrastructure.
Events & Temporary Structures
For crowd barriers, temporary stages, and event infrastructure, key clamps offer fast assembly and disassembly without specialist equipment — making them a cost-effective choice for temporary applications.
Commercial & Retail
In retail and commercial environments, key clamps are used to create stylish racking systems, clothing displays, and furniture. The option to powder coat to any RAL colour allows seamless integration with interior design schemes.
Rail Industry
GRP key clamps are increasingly specified in the rail industry due to their non-conductive properties, corrosion resistance, and compliance with rail infrastructure standards.
Key Factors to Consider When Choosing Key Clamps
Material Standard hot-dip galvanised steel is suitable for most applications. Some suppliers offer double-hot-dip galvanised fittings — shinier but not necessarily more durable for most uses. GRP is the right choice for corrosive or electrically sensitive environments.
Finish Standard galvanised finish suits most industrial applications. Powder coating is available in any RAL colour — ideal where aesthetics matter or high-visibility yellow is required for safety.
Tube Size Ensure your fittings match your tube diameter. Mixing sizes will result in insecure connections. Our team can advise on the correct specification for your project.
Application & Load Requirements Consider the loads your structure will need to bear. Handrails for public use must meet specific load requirements under UK Building Regulations. Heavy-duty applications may require closer post spacing or larger tube diameters.
Compliance & Standards Ensure your key clamp system complies with the relevant standards for your application:
| Standard | Application |
|---|---|
| BS EN ISO 14122 | Industrial walkways and access platforms |
| BS 4592 | Open steel flooring and handrails |
| Building Regulations Part K | Stairs, ramps, and guarding in buildings |
| Building Regulations Part M | Accessibility requirements |
| Equality Act 2010 | Accessibility in public spaces |
| HSE HSG76 | Warehousing and storage safety |
Ease of Installation Lockinex key clamps are designed for straightforward installation without specialist training. A standard Allen key is all that's required to tighten the grub screws and secure the fitting.
Cost Key clamps offer significant cost savings over welded alternatives — both in materials and installation labour. At Lockinex, our pricing is highly competitive without compromising on quality.
Our Key Clamp Product Range
At Lockinex, we stock a comprehensive range of key clamp products to suit any project:
Galvanised Steel Key Clamp Fittings — full range of fitting shapes and sizesGRP Key Clamp Fittings — for corrosive and electrically sensitive environmentsReady Made Posts — Galvanised — pre-assembled posts for fast installationReady Made Posts — GRP — GRP pre-assembled posts- Galvanised Steel Tube — cut to length or standard lengths available
- Powder Coating — available on request for any RAL colour
All components can be used individually or combined to create a complete, bespoke key clamp system tailored to your exact requirements.
Need Help Specifying Your Key Clamp System?
Not sure which fittings you need? Our team is here to help. Contact us at