What is a BS 3621 lock?

A lock tested and kitemarked to British Standard 3621 for security and durability, often required by home insurers on exit doors.

Many insurance policies require a BS 3621 lock on final exit doors. Check your policy wording.

What finishes are available?

Forends and fittings are offered in stainless steel and plated finishes.

ZBS - British Standard Locks and Accessories

BS 3621 British Standard Locks for Insurance-Rated Doors

The Zoo ZBS range offers British Standard locks and accessories, tested to BS 3621 for doors that need an insurance-rated lock. Part of the Zoo locks and latches range.

Why a British Standard Lock

Many home insurers require a BS 3621 lock on final exit doors; the kitemark shows the lock has passed security and durability testing. Available as sash locks and deadlocks, with matching cylinders where needed.

Sizes and Finishes

British Standard locks come in common case sizes with forends in stainless steel and plated finishes. See the wider Zoo locks and latches range.

Trusted UK Ironmongery Supplier Since 1976

Zoo Hardware is supplied by Trade Door Handles, part of T.H. Wiggans Ironmongery, a trusted UK supplier of architectural ironmongery since 1976 with large showrooms in Kendal and Carlisle. Browse the full Zoo Hardware collection for matching contract door hardware, locks, hinges and accessories, with quick nationwide delivery across the UK.