Lock Case Order Guide: The 4 Dimensions to State
Order a lock case by four dimensions: center distance, backset, faceplate length and width, and case height and depth. Lc21 8550, for example, has an 85mm center distance and a 50mm backset. Match the handle to the center distance and the cylinder to the door. Always quote the full code.
The set to order
| Part | What to check | Models |
|---|---|---|
| Lock case, latch and deadbolt | 1 per door. 85mm center distance. Backsets 40mm, 50mm and 55mm. Euro cylinder hole. | Lc02 8540, Lc21 8550, Lc08 8555 |
| Multi-bolt lock case | 1 per door. Lc04 8560 and Lc14 8550 show four round bolts, Lc05 8560 shows three square bolts. The frame needs a hole for every bolt. | Lc04 8560, Lc14 8550, Lc05 8560 |
| Lock case with its own key | 1 per door. Keyhole only, no cylinder to order. 110 is 68mm x 40mm, 111 is 72mm x 40mm, 140 is 72mm x 25mm. | 110, 111, 140 |
| Lock case for escape doors | 1 per door. 72mm center distance, 55mm backset, listed with a panic exit function. Opening from inside must never need a key. Confirm the function with the local authority. | Lc33 5572 |
| Narrow lock case | 1 per door, for narrow door frames. Lc8520 has a 20mm backset. Lc15 has a hook bolt. HY006ET is for aluminum narrow-stile doors and includes its cylinder. | Lc8520, Lc15, HY006ET |
| Cylinder | 1 per euro case. Key outside, turn inside. Length follows door plus trim. | 60 SNKT, 70 SNKT, 80 SNKT |
| Rose lever | 1 pair per door, with cylinder roses. 53mm rose, 8mm spindle, doors 35mm to 50mm. Needs more than 26.5mm backset. | 9003E, 9005E |
| Backplate lever | 1 pair per door, with a euro cutout in each plate. Check the plate hole spacing against the case center distance. | EH01 |
| Complete mortise set | 1 per door. Lever plates, case, euro cylinder with keys, spindle, strike and screws. 58mm center distance, 45mm backset. | 9088 SS |
The four dimensions a buyer states
Door thickness is not one of the four. The case fits inside the door, so thickness decides the cylinder length, the spindle and the handle fixings, not the case.
If you are replacing an old lock, measure the old case. A different center distance means new holes through both faces of the door.
| Dimension | Measured from | What it fixes on the door |
|---|---|---|
| 1. Center distance | Spindle center to cylinder center | The hole spacing in the door and in any backplate |
| 2. Backset | Faceplate surface to cylinder center | How far the handle and cylinder sit from the door edge |
| 3. Faceplate | Length and width | The recess cut into the door edge |
| 4. Case | Height and depth | The pocket cut into the door |
Quote the full code: one number can be several cases
- 85 series codes read center distance first: Lc21 8550 is 85mm center, 50mm backset.
- So do LC5845, Lc6860 and Lc9230.
- Lc33 5572 and Lc34 5072 read backset first: 55mm and 50mm backset on a 72mm center.
- Horizontal cases also read backset first: Lc7065 is 70mm backset, then 65mm from cylinder to spindle.
- Lc9045 is 90mm backset, then 45mm from cylinder center to the back of the case.
- PS changes meaning: Lc8520 PS and Lc8530 PS have a roller bolt and a deadbolt, while Lc06 8550PS shows a latch only.
- Case pages carry a general list of functions for the whole range. State the function you need on the order and have it confirmed for that code.
| Number | Code | What the photograph shows |
|---|---|---|
| 8560 | Lc04 8560 | Latch and four round bolts |
| 8560 | Lc05 8560 | Latch and three square bolts |
| 8560 | Lc09 8560 | Latch, no bolts showing |
| 8545 | Lc03 8545 | Latch and one deadbolt, brass-color faceplate |
| 8545 | Lc07 8545 | Latch and three square bolts |
| 8550 | Lc06 8550PS | Latch only, no cylinder hole |
| 8550 | Lc14 8550 | Latch and four round bolts |
| 8550 | Lc21 8550 | Latch and one deadbolt, black case |
| 8550 | Lc35 8550 | Latch and one deadbolt, light case, brass-color faceplate |
| 110 | 110 lock case | 68mm x 40mm case. We also list a glass door handle numbered 110, so write lock case on the order |
Center distances and backsets we list
Narrow cases are listed by backset alone: Lc15 at 20mm, Lc18 at 17mm, Lc17, Lc19 and Lc20 at 16mm. Lc17 is for sliding doors. Custom sizes are available: send the drawing.
| Center distance | Backset | Codes |
|---|---|---|
| 58mm | 45mm | LC5845 |
| 68mm | 40mm, 60mm | 110 lock case, Lc6860 |
| 72mm | 25mm | 140 |
| 72mm | 40mm | 111, 111 DP |
| 72mm | 50mm, 55mm, 65mm | Lc34 5072, Lc33 5572, 72 |
| 85mm | 20mm | Lc8520, Lc8520 B, Lc8520 PS |
| 85mm | 25mm | Lc8525, Lc8525 B |
| 85mm | 30mm | Lc8530 BK, Lc8530 PS, AI8530 |
| 85mm | 35mm, 40mm | Lc8535, Lc8535 B, Lc02 8540 |
| 85mm | 45mm, 50mm | Lc03 8545, Lc07 8545, Lc06 8550PS, Lc14 8550, Lc21 8550, Lc35 8550 |
| 85mm | 55mm, 60mm, 70mm | Lc08 8555, Lc04 8560, Lc05 8560, Lc09 8560, LC04 8570 |
| 92mm | 30mm | Lc9230 |
Faceplate and case size, where we have a drawing
For every other code, faceplate and case size are confirmed against your drawing before production. Do not borrow a number from a similar case: a pocket cut to the wrong size is the most expensive line on the order to correct.
| Code | Faceplate | Case |
|---|---|---|
| 111 | 220 x 25mm | 140mm high |
| 72 | 234 x 24mm | 186mm high, 82mm deep |
| Lc08 8555 | 238 x 23mm | 173mm high, 83mm deep |
| Lc7065 | 160 x 19.5mm | 150 x 77mm |
| 7066 | 160mm long | 164 x 44mm |
How to match the handle
- Backplate handle: the spindle and cylinder holes in the plate must sit at the same center distance as the case.
- Rose levers such as 9003E and 9005E: lever and cylinder have separate roses, so you drill at the case center distance.
- Rose diameter: 9003E has a 53mm rose, so its edge sits 26.5mm from the center. On a 20mm or 25mm backset it would overhang the door edge.
- Spindle: 9003E and 9005E list 8mm and LH1016 lists 9mm. Lc08 8555 is drawn 8mm square and 72 lists a 9mm bar.
- For other cases, have the spindle size confirmed against your drawing, because an 8mm spindle in a 9mm hole leaves the lever loose.
- Door range: 9003E suits doors 35mm to 50mm, and EH01 suits 35mm to 45mm.
- Complete set: 9088 SS arrives with lever plates, a 58mm center case at 45mm backset, euro cylinder, spindle and strike.
How to match the cylinder
The turn of a key and turn cylinder goes on the inside face. A double key cylinder needs a key inside as well, so never put one on a door people must be able to leave through. The International Building Code and NFPA 101 both restrict key-only operation on the inside of an exit door. Confirm the rule for your project with the local authority.
| Hole in the case | Codes | What to order |
|---|---|---|
| Euro profile | 85 and 92 series with a cylinder hole, Lc33 5572, Lc34 5072, LC5845, Lc6860, Lc7065, Lc9045, Lc15 | Euro cylinder, length from door plus trim |
| Oval slot | Lc17, Lc18, Lc19, Lc20, 7066 | Oval cylinder, with the fit confirmed against your drawing |
| Keyhole only | 110 lock case, 111, 111 DP, 140, 1121 | No cylinder. These are photographed with their own bit key |
| Round threaded | HY006DK, HY006ET, HY008 | American-style cylinder, included |
| None | Lc06 8550PS | No cylinder. Spindle only, as photographed |
Quantities per door
Multi-bolt cases such as Lc04 8560 need a frame strike cut for every bolt, so state the bolt count when you order the frame. On a pair used as an exit, manual flush bolts are often not accepted: check with your local authority.
| Line | Single door | Pair of doors |
|---|---|---|
| Lock case with strike | 1 | 1, on the active leaf |
| Cylinder | 1 | 1 |
| Handle set | 1 pair of levers | 1 pair of levers |
| Flush bolts | None | 2 on the inactive leaf, top and bottom |
What goes wrong on site
- Ordered as 8550 only: the wrong one of four cases arrives.
- Horizontal case read as vertical: Lc7065 cut as if 70mm were the center distance.
- A cylinder bought for a keyhole-only case, such as 111, which has no cylinder hole.
- Latch facing the wrong way: the slanted face must meet the frame as the door closes. Check it before the door is hung.
- Handing assumed: HY007 is listed reversible, but HY007-S is ordered left hand or right hand.
- Rose lever on a 20mm backset: the rose runs off the door edge.
- Screws for the handle driven into the case: check the fixing positions against the case before drilling.
What to send
- Full code, with the words lock case.
- Center distance and backset.
- Faceplate length, width and corner shape.
- Case height and depth, or the pocket size your door allows.
- Door material and thickness.
- Function: for example latch and deadbolt, or roller bolt and deadbolt.
- Faceplate finish.
- Handle model and spindle size.
- Cylinder type and length.
- Number of single doors and pairs.
Questions buyers ask
What is the difference between backset and center distance?
Backset runs across the door, from the faceplate to the cylinder center. Center distance runs down the door, from the spindle to the cylinder. A case is identified by both, and swapping them is the commonest misreading of a code.
Does a lock case include the cylinder?
HY006DK, HY006ET and HY008 include an American-style cylinder, and 9088 SS is a complete set. For euro cases, order the cylinder as its own line, because its length depends on your door.
Can you supply a lock case in a size you do not list?
Yes. Custom dimensions are available as OEM and ODM work. Send a drawing with the four dimensions, the bolts you need and the door material.
Which lock case suits an aluminum door?
Aluminum stiles need a short backset. We list AI8530 at 30mm for aluminum, wooden and metal doors, Lc15 at 20mm, HY006DK, HY006ET and HY008 for aluminum narrow-stile doors, and HY007 for aluminum storefront doors. Measure the stile first.
Can I use these cases on a fire door?
A fire door needs the lock approved as part of that door. We do not state a fire rating for these cases, so send the door specification and confirm the requirement with the door maker and your local authority before ordering.
Sources
Codes change and vary by place. Confirm with the authority for your project.