UNION C-Series 3K74E BS 5 Lever Sashlock

The UNION C-Series 3K74E (formerly known as Chubb) is a premium, British Standard 5-lever mortice sashlock designed to offer exceptional security for external timber doors. Manufactured in the UK, this high-security lock is fully certified to BS EN 3621 and approved by Secured by Design, making it a trusted choice for both residential and commercial properties.

A key benefit of the 3K74E is its unique roller latchbolt, which provides incredibly smooth operation and allows the lock to be fitted to either left or right-hand hung doors without any manual modification. For robust physical protection, the lock features a 20mm deadbolt equipped with advanced anti-drill, anti-pick, and anti-saw features. It is also EN1634-1 fire-rated for use on 60-minute timber fire doors and comes backed by a 25-year manufacturer's guarantee.

This sashlock is available in a variety of configurations to suit your installation needs. Please choose from the options below to select your preferred backset (40mm or 53mm, with corresponding 67mm or 80mm case depths), finish (Polished Brass or Satin Chrome), keying option (Keyed Alike or Keyed To Differ), and packaging type (Boxed or Visi).

Technical Specifications

• Brand: Union C-Series (formerly Chubb)
• Mechanism: 5 Lever BS
• Standards: BS EN 3621, Secured by Design
• Fire Rating: EN1634-1 approved for 60-minute timber fire doors
• Case Height: 108mm
• Centres: 57mm
• Forend Dimensions: 153mm (Length) x 25mm (Width)
• Backset Options: 40mm or 53mm (please choose from the options below)
• Case Depth Options: 67mm or 80mm (please choose from the options below)
• Finish Options: Polished Brass or Satin Chrome (please choose from the options below)
• Keying Options: Keyed Alike or Keyed To Differ (please choose from the options below)
• Keys Supplied: 3 keys per lock

Key Features

• High Security Deadbolt: 20mm deadbolt with robust anti-drill, anti-pick, and anti-saw protection.
• Universal Handing: Reversible roller latchbolt allows for easy installation on both left and right-hand hung doors without modification.
• Smooth Operation: Roller bolt mechanism ensures a smooth, reliable latching action.
• UK Manufactured: Proudly made in the UK to the highest engineering standards.
• Long-Term Reliability: Backed by a comprehensive 25-year manufacturer's guarantee.