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Key clamp fittings, also known as tube clamp fittings, act as vital parts in flexible building systems used in many fields. These sturdy links help create strong frames with regular steel tubes, skipping the hassle of welding or special making.
In places from factory storage areas and transport centers to community play zones, key clamp fittings offer steady backing for safety walls, handrails, and show setups.
Key clamp fittings include carefully made soft iron pieces built to join sections of tubing or piping at set angles and layouts.
Created from top-quality soft cast iron that follows rules like BS EN 1562:2019 and ASTM A197, these fittings have a design with many sockets that allow tube entry from various sides.
Every kind—such as a direct linker, 90-degree bend, T-link, or movable turn—is shaped to precise limits. This ensures smooth fitting without harming the tube's strength.
The main way works with a group of strong small screws placed inside the fitting's sockets. These screws, often M8 or M10, get tightened by a common hex Allen key.
When force is added—suggested at 40–50 Nm for most types—the screw’s pointed end digs into the tube’s outside layer. It forms a grip based on friction that spreads weight equally over the join.
This setup reaches a pull strength over 350 MPa and stretch of at least 10%, based on ASTM rules. It makes the link as tough as welded ones but much easier to change.
Manufacturers like FLUIDO focus on these fittings. They make more than 60 types with hot-dip galvanization per ASTM A153 to boost lasting time.
Used for safety rails, barriers, and dock protection. Keeping steady under moving forces, like truck hits or people walking.
Often used in parks, schools, and parking lots for handrails. Resistant to rust in wet or salty conditions.
Also used in flexible shelves and clothes stands for better space use.
Key clamp fittings remove the want for welding or custom making. Putting together uses only machine fixing. It cuts setup time by up to 50%.
The flexible build eases taking apart and moving. Builds made with key clamps can get reshaped many times without hurting join strength. This fits short-term setups or changing site plans.
Fittings get built to hold straight loads more than similar welded links.
Match with BS EN 1563:2018 for bendy iron types ensures toughness against shakes, hits, and heat growth.
Hot-dip galvanization gives a zinc cover that fights rust and decay in tough settings—from beach wetness to factory dirt.
Fittings need to match exactly with the outer width of the planned tubing. It usually goes from 21.3 mm (3/4") to 60.3 mm (2-3/8").
Right measuring, including wall depth, stops sliding under weight.
The link kind guides fitting pick:
Straight connectors for straight parts
90-degree elbows for bends
T-joints for splits
Cross fittings for many-way centers
Swivel variants for angles up to 180°
Weight needs shape choices more—normal soft iron works for light handrails.
While bendy iron types manage heavy factory walls.
Setting factors affect material pick:
Galvanized for outside use
Stainless steel for clean or sea spots
Marks like CE or ISO 9001 ensure rule following.
The worker pushes the fitting over tube ends, puts in an Allen key, and adds force.
The small screw’s cone tip enters the surface (0.5–1 mm deep) to make a toothed machine lock without hurting the tube side.
This lock forms a friction link where the tube’s bend fights change.
And the socket spreads cut forces equally.
Finite element analysis (FEA) proves firmness under twist, curve, and straight pull—break often happens in the tube, not the clamp.
Taking apart is easy: opposite turn frees the hold for new spots.
Better types include two screws per socket for shake fight.
And FLUIDO’s hot-dip galvanization (50–100 µm zinc layer) boosts rust fight.
Join with pipe hangers or U-bolt clamps grows their part in hanging systems.
Q1: What materials are used to make key clamp fittings?
A1: Malleable cast iron (ASTM A197, BS EN 1562) with optional stainless steel or galvanized finishes per ASTM A153.
Q2: What projects use key clamp fittings most?
A2: Applications include handrails, guardrails, shelving, barriers, and frameworks in industrial, retail, and marine sectors.
Q3: What tools are required for installation?
A3: Only a standard hex Allen key—no welding or special tools needed.
Q4: How do they compare to welded systems?
A4: Key clamps offer adjustability, faster installation, and reusability, with strength equivalent to welding.
For manufacturers, suppliers, and factories seeking high-volume, customizable key clamp fittings, FLUIDO delivers factory-direct excellence.
As a trusted OEM partner, FLUIDO produces precision malleable iron components tailored to exact specifications.
