Hettich HBS 31 FSL Sash Lock – DIN Left/Right, 45 mm Backset, Stainless Steel

Overview

The Hettich HBS 31 FSL is a mortise lock body designed for wooden, single-leaf doors requiring a sash lock with a handle/knob execution. It is built as a left/right-handed (DIN reversible) unit, meaning one product model works on either door swing direction, simplifying stocking and installation.

What It Does

This lock body fits inside the door for discreet, flush installation and provides the core locking mechanism for residential and commercial doors. It is rated for high-frequency use, making it suitable for doors that are opened and closed often, such as entry doors in homes, offices, or common areas.

Key Capabilities

• Lock type: PZ-85 (W = handle/knob execution)
• Backset: 45 mm
• Centre to centre (CTC): 85 mm
• Face plate: Stainless steel, 23 mm width
• Hub size: 8 mm
• Lock case: Galvanized steel, closed case design
• Handing: Left/right-handed version available in the same model (DIN reversible)
• Latch bolt: Shiftable without opening the lock case, allowing on-site adjustment
• Rated for: High-frequency doors
• Door type: Wooden, single-leaf doors
• Fire rated: No
• Warranty: 5 years

Who It Helps

• Homeowners and contractors installing or replacing mortise locks on wooden doors
• Architects and builders specifying door hardware for residential or light commercial projects
• Hardware retailers and distributors sourcing DIN-reversible sash locks with standard 85 mm CTC and 45 mm backset dimensions

Buyer Questions This Page Should Answer

What is the backset and centre-to-centre measurement?

Backset is 45 mm and centre to centre (CTC) is 85 mm — standard dimensions for compatibility with common handle and cylinder hardware.

Can this lock be used on both left- and right-hand doors?

Yes. It is a DIN Left/Right lock, meaning the same model can be installed on either handing without needing a separate SKU.

What materials is it made from?

The face plate is stainless steel and the lock case is galvanized steel, giving it a durable, corrosion-resistant build.

Is it suitable for high-traffic doors?

Yes, it is rated for doors with high frequency of use.

Can the latch bolt direction be adjusted after installation?

Yes. The latch bolt is shiftable and can be adjusted without opening the lock case.

Is this lock fire-rated?

No, this product is not fire rated.

What type of door is it designed for?

It is designed for wooden, single-leaf doors.

What warranty is included?

The product carries a 5-year warranty.

Product Facts

Resources or Next Steps

• View or purchase the Hettich HBS 31 FSL Sash Lock
• Browse more Hettich door hardware