Understanding whether your uPVC door uses a single spindle or split spindle operation is crucial for both security and compatibility when replacing handles or gearboxes. This guide walks you through how to identify your lock type, what each configuration offers, and how to upgrade for improved security without unnecessary parts replacement.
What is a Single Spindle Operation?
A single spindle, also known as a lever‑lever, features a solid steel bar running through both handles.
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Test it: From the outside, with the door unlocked and closed, try lifting or pressing the handle—if it opens without a key, it's a single spindle setup.
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Both handles are typically at the same height, engaging the latch simultaneously.
** Pros:** Convenient and straightforward.
** Cons:** Less secure—anyone can open the door by lifting the handle if it’s left unlocked.
What is a Split (Dual) Spindle Operation?
Also called a split or dual spindle—or sometimes referred to as a night latch function—this setup disables external handle operation unless unlocked with a key.
To identify it:
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With the door closed and unlocked, lift the outside handle—if the door doesn’t open, it’s a split spindle.
** Pros:** Enhanced security—prevents unkeyed entry from outside.
** Cons:** Higher risk of locking yourself out if you accidentally close the door without a key.
How to Identify Your Spindle Type Quickly
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Stand outside with the door closed but not locked
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Attempt to open by lifting or pushing the handle
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Opens → Single spindle
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Doesn’t open → Split spindle
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Perfect for confirming before ordering replacement gearboxes or handles.
Why This Matters for Security & Shopping
Choosing the right spindle setup ensures:
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Proper security alignment—Split spindle locks add boosted protection, especially when leaving the home.
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Correct parts selection—You avoid returns by matching handles, gearboxes, and handles to your spindle type.
Browse our compatible options in the Multipoint Gearboxes collection for gearboxes with both single and split spindle capabilities.
Can You Convert Between Spindle Types?
Yes—in certain cases. If your gearbox supports it, converting might be as simple as changing to a split spindle bar and replacing lever handles with lever/pad handles.
However, if your gearbox doesn’t allow this, you may need a new mechanism or a full lock replacement.
