Half Mortise Box Lock Information
Half Mortise Locks are a popular style, frequently used on 18th, 19th and 20th century boxes and chests. Lock-mechanism fits into a cut out indentation inside box. Strike attached to underside of lift lid. Lock-plate is only visible from box interior.
USE ON DRAWERS and DOORS
Drawer Locks were commonly used on drawers. Lock-bolt shoots up into case above drawer, a strike is rarely used.
Door Locks are handed meaning right-hand or left-hand. Please note: some half mortise locks are not available in both left and right options. When looking for door locks be sure lock is handed according to your needs.
- doors hinged on right - bolt shoots to the left.
- doors hinged on left - bolt shoots to the right.
MEASURING HALF MORTISE LOCKS:
Before looking for a replacement it will be necessary to measure your lock.
Please view diagram to determine how to measure your lock.
The backset measurement, is the most important measurement, must match precisely
Once the backset measurement is determined you can look at your various options.
If potential substitutes have different lock-body or lock-plate measurements cabinet work may be necessary to fit the lock.
INSTALLING HALF MORTISE LOCKS:
Determine desired location of lock
Adjust position to allow for location of keyhole as it is often off center in lock
Mark location of lock on drawer or door interior
Hold lock at desired location against drawer or door interior
Selvedge edge should be level with top of drawer or edge of door
Trace outline of lock on drawer or door interior
Trace outline of selvedge on drawer top or door edge
Inspect outline for accuracy , straighten lines where necessary
Again holding lock in position, trace lock-body
Cut shallow mortise for lock plate and selvedge with router or chisel
Selvedge and lock-plate should be flush with the interior wood surface once installed
Cut lock-body-mortise. Okay if off slightly as lock-plate will cover lock-body once installed. Be sure there is ample room for mounting screws to attach lock
Strike plate with hooks is necessary for boxes and chests with lift lids
Align strike on underside of lid
Trace outline of strike in position
Check strike alignment and make adjustments if necessary
Screw into place
Measure distance from top of lock-plate to center of key pin
Measure distance from side of lock-plate to center of key pin
With these two measurements locate keyhole on furniture front, make sure key pin is aligned with keyhole location
Drill small pilot hole at key pin location, hold lock in position and check to make sure hole lines up with key pin
Drill hole larger to accommodate key barrel
For a finished appearance: mount an escutcheon/keyhole plate, on furniture front.
If Using Brass Wood Screws
Care is required when installing brass screws. While these screws are the best match for most antique hardware however they are not as strong as steel screws. The screw is easily damaged if the hole is not properly prepared.
The best practice is to first drill a pilot hole. Use a drill bit slightly smaller than the overall width of the screw, including threads, to drill the hole. Then use a steel screw, the same size as brass screw, to “cut threads” in pilot hole, by screwing steel screw into and then out of hole.
When will my order ship?
Orders normally leave our warehouse in 1 – 2 business days
Ground delivery usually takes 3-5 business days depending upon your location. We ship out of Maryland
Ground Shipping is Free on Orders over $99 to the 48 contiguous states, USA
Low $6.95 flat-rate shipping for orders less than $99 to the 48 contiguous states, USA
Air and International shipping is calculated according to carrier rates, box size and weight. Please call or email for assistance.
Returns are accepted within 60 days of receipt for a full merchandise refund - your original payment method will be credited for the merchandise amount.
If you need assistance, we are happy to help! 800-241-9741
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