Hettich HBS 31 FSL Sash Lock – DIN Left/Right, 55 mm Backset, Stainless Steel
Overview
The Hettich HBS 31 FSL is a mortise lock body (sash lock) designed for wooden single-leaf doors in residential and commercial settings. It fits within the door body for discreet, secure locking and is built for high-frequency use. The same model works as either a left-handed or right-handed lock (DIN Left/Right), simplifying stocking and installation.
What It Does
This lock body provides the core mechanical locking function inside a door, paired with matching handles or knobs (PZ-85 execution). It uses a closed lock case with a shiftable latch bolt, meaning the latch bolt direction can be adjusted without opening the lock case — useful for on-site handing changes.
Who It Helps
- Architects, contractors, and carpenters specifying mortise locks for wooden doors
- Hardware distributors and retailers stocking Hettich door locking solutions
- Facility managers replacing or upgrading lock bodies on high-frequency doors
- Homeowners or renovators sourcing a durable, stainless steel-faced sash lock
Key Capabilities
- Lock type: PZ-85 (handle/knob execution), sash lock
- Backset: 55 mm
- Centre to centre (CTC): 85 mm
- Face plate: Stainless steel, 23 mm width, 8 mm hub
- Lock case: Galvanized steel, closed case design
- Handing: Left/right handed version available in the same model (DIN Left/Right)
- Latch bolt: Shiftable without opening the lock case
- Rated for: High-frequency doors
- Warranty: 5 years
Specifications
| Attribute | Value |
|---|---|
| Model | Lock Body |
| Lock Type | Sash Lock |
| Back Set | 55 mm |
| Centre to Centre | 85 mm |
| Face Plate Material | Stainless Steel |
| Lock Case Material | Galvanised Steel |
| Finish Type | SS (Stainless Steel) |
| Door Type | Wooden |
| Applicable For | Single Leaf Door |
| Fire Rated | No |
| Unit | Set |
| SKU | 9228578 |
Pricing and Availability
| Detail | Value |
|---|---|
| Brand | Hettich |
| Category | Door Locking Solution > Mortise Lock Body |
| Currency | INR |
Buyer Questions This Page Should Answer
Is this lock left-handed or right-handed?
Both. The HBS 31 FSL ships as a single model that supports DIN Left/Right handing, so one SKU covers either door swing direction.
What backset and centre-to-centre spacing does it use?
55 mm backset with an 85 mm centre-to-centre (CTC) measurement — confirm these match your door prep before ordering.
Can I change the latch bolt direction after installation?
Yes. The latch bolt is shiftable and can be adjusted without opening the lock case, which simplifies field handing changes.
What door types is it suitable for?
It is intended for wooden, single-leaf doors and is rated for high-frequency use.
What is the face plate and lock case made of?
The face plate is stainless steel (23 mm width, 8 mm hub) and the lock case is galvanized steel, housed in a closed case design.
Is it fire rated?
No, this lock body is not fire rated.
What warranty is included?
Hettich covers this lock body with a 5-year warranty.
Resources
Current product facts
Last checked by Readable: 2026-09-29T18:46:58.898Z
- Product: Hettich HBS 31 FSL: Sash Lock DIN Left/Right CTC 85 & Backset 55 SS Finish
- Brand: Hettich
- Category: Door Locking Solution > Mortise Lock Body
- SKU: 9228578
- Price: ₹1,280 (MRP ₹1,600)
- Availability: InStock