G-U Single Point Mortise Lock – 55mm Backset, 92mm PZ, Key Below

SKU 6-C4871-55-0-SS

$198.31 - $198.31

$198.31

$198.31 - $198.31

$198.31

PZ: 92mm
Backset: 2-5/32" (55mm)
Faceplate Width: 5/8" (16mm)
Faceplate Length: 11-1/2" (292mm)
Cylinder Type: Euro Profile, 5-pin (not included)
Key Position: Below lever
Faceplate Ends: Radius
Stamped: G-U 55/92 on lock case
Reversible handing
Lift handle to throw deadbolt, turn thumbturn or key to secure

Estimated Delivery

Between December 13 and December 17

*Delivery dates are estimates and may vary based on availability and shipping method

Product Details

G-U Single Point Mortise Lock – 55/92 (6-C4871-55-0-SS)

This G-U single point mortise lock features a 55mm backset and 92mm PZ measurement, making it a reliable choice for single point door applications. The lock body has radius-ended faceplates and accepts a Euro profile 5-pin cylinder (not included).

The key cylinder is positioned below the lever handle. To operate, lift the handle to throw the deadbolt, then turn the thumbturn or key to secure the door in the locked position.

Stamped With

G-U 55/92 stamped in lock case

Technical Information

Backset: 2-5/32 inches (55mm)
PZ: 92mm
Faceplate Width: 5/8 inches (16mm)
Faceplate Length: 11-1/2 inches (292mm)
Cylinder Type: Euro Profile, 5-pin (not included)
Key Position: Below lever
Faceplate Ends: Radius

Notes

Handing is reversible without removing the lock from the door
To reverse handing: lift handle to extend deadbolt, depress slot behind latch and pull latch out, depress handle to retract deadbolt latch, rotate latch and push back in until you hear a click
Always test the lock to verify proper function before installation
The spring latch should retract flush with the faceplate if installed correctly

Fill out our MPL form or call us to ensure accurate purchasing and correct fit.

Frequently Asked Questions

How do I reverse the handing on this G-U lock?

Lift the handle to extend the deadbolt, depress the slot behind the latch and pull it out, depress the handle to retract the deadbolt, rotate the latch 180 degrees, and push it back in until you hear a click.

What does 55/92 mean on this lock?

The 55 refers to the 55mm backset (distance from door edge to handle center), and 92 refers to the 92mm PZ measurement (distance from handle center to cylinder center).

Is a cylinder included with this lock?

No, this lock accepts a Euro profile 5-pin cylinder which is sold separately.

Shipping & Returns

At mplocks.com, we strive to provide fast, reliable, and fairly priced shipping. Below you'll find our standard shipping details, important notes, and packing practices.

Standard Shipping Rates

Shipping applies to the contiguous U.S. (orders to Alaska and Hawaii require a custom quote):

$11.95 – USPS First Class (5–10 business days)
$12.95 – USPS Priority Mail (3–6 business days)
$19.50 – UPS Ground (2–5 business days)

📦 Rates typically cover packages up to 4 lbs. Oversized or heavier items may incur additional charges.

Processing Times

Most orders ship within 2–5 business days of purchase.
If your order is delayed, we'll notify you promptly.

Important Notes on Shipping Costs

Certain items may have higher shipping costs due to weight or dimensions.
We reserve the right to adjust shipping fees. If this applies to your order, we'll contact you for approval before proceeding.
If you choose not to accept revised shipping charges, we may cancel your order at our discretion.

Backorders & Billing

All credit cards are charged within 72 hours of purchase.
This includes orders that contain backordered items.

Our Packing Standards

We take great care to ensure your order arrives safely and securely.

Whenever possible, we use recycled paper, cardboard, and eco-friendly packaging materials.
Many of our products are purchased in bulk and may not include retail packaging or barcodes. In these cases, items may be repackaged in secure, plain boxes.
Hardware ships in retail or contractor-grade packaging when available.
Every item is inspected prior to shipping, and additional packing is used if needed.