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From The Anvil
From The Anvil - Black 3" 5 Lever Heavy Duty BS Sash Lock
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York British Standard 5 Lever Sashlock 2 1/2" - Matt Black
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Antique Brass
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Matt Bronze
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Polished Brass
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Polished Chrome / Polished Nickel
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Satin Brass
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York Security - British Standard 5 Lever Sashlock 2 1/2" - Satin Chrome / Nickel Finish
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York Security - British Standard 5 Lever Sashlock 3" - Antique Brass
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York Security - British Standard 5 Lever Sashlock 3" - Matt Bronze
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York Security - British Standard 5 Lever Sashlock 3" - Polished Brass
Sale price £28.70 (Inc. VAT) Normal Price: £35.88 £23.92 (Ex. VAT)Unit price /Unavailable
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York Security - British Standard 5 Lever Sashlock 3" - Polished Chrome / Polished Nickel
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Why a 5 Lever Mortice Sash Lock is the UK Standard for External Doors
Trusted security for UK homes and businesses
The Standard Mortice Key 5 Lever Sash Lock is the preferred choice for securing external wooden doors across the UK. With a hardened deadbolt, anti-pick plates, and a robust five-lever mechanism, it delivers exceptional resistance against forced entry. British Standard BS3621 models meet the requirements of many insurance providers, ensuring your home or business remains protected to an approved security level.
Whether you’re upgrading an old 3 lever lock or installing a new door, choosing a BS3621 5 Lever Mortice Lock ensures compliance with UK security standards and provides peace of mind for years to come. For the best fit and security, these locks pair perfectly with lock door handles on a backplate, combining style with strength.
Choosing the Right Size for Your Door
Understanding mortice sash lock sizing for the perfect fit
These locks are available in two main case sizes: 64mm (2.5 inch) and 76mm (3 inch). The 2.5" size is by far the most popular for standard UK internal and external wooden doors. However, if you have deeper door casings, thicker panels, or fire door casings, the 3" size is recommended to ensure correct backset alignment and handle positioning.
Both sizes are fully compatible with lock door handles on a backplate, creating a secure and stylish installation. Popular finishes include polished brass, polished chrome, and satin stainless steel, making it easy to match your sash lock to both modern and traditional properties.
Frequently Asked Questions
Are all 5 lever mortice locks BS3621 approved?
Are all 5 lever mortice locks BS3621 approved?
No. Only models tested to BS3621 carry the kite mark and meet insurance requirements.
Can I replace my 3 lever lock with a 5 lever lock?
Can I replace my 3 lever lock with a 5 lever lock?
Yes and no. The backset, depth, spindle, and keyhole positions are generally the same, so fitting is often straightforward. However, a 5 lever lock is thicker than a 2 or 3 lever model due to the extra levers inside the mechanism. You’ll also often find that the deadbolt throws deeper into the casing, making it more secure.
What handles should I use with a 5 lever sash lock?
What handles should I use with a 5 lever sash lock?
They work best with lock door handles on a backplate.
Do you offer UK-wide delivery?
Do you offer UK-wide delivery?
Yes – we deliver across the UK including London, Manchester, Birmingham, Leeds, Bristol, and Glasgow.
3 Lever vs 5 Lever Mortice Locks – Which Should You Choose?
Choosing the right mortice lock for your security needs
While 3 lever mortice locks are cost-effective and suitable for low-security internal doors, a 5 lever mortice sash lock is the correct choice for external wooden doors requiring enhanced protection. The five-lever mechanism offers more key combinations, stronger resistance to picking, and, in BS3621 models, additional anti-saw and anti-drill security features.
If you’re securing a front door, back door, or high-value storage area, a 5 lever lock provides the strength and reliability you need. They also pair perfectly with lock door handles on a backplate to ensure a professional fit and a consistent look across your door furniture.
When comparing the two, remember that while both can fit similar case sizes, the 5 lever lock is slightly thicker internally and throws the deadbolt deeper into the keep, giving greater resistance against forced entry.