Lock Cylinder Length: Door Plus Trim, Then Round Up
Order a lock cylinder as long as the door plus the trim on both sides, rounded up to a size we list: 60mm, 65mm, 70mm, 80mm or 90mm. A 45mm door with 8mm trim each side takes 65 SNKT. Then state the profile, the key type and the keying.
The set to order
| Part | What to check | Models |
|---|---|---|
| Key and turn cylinder | 1 per door. Key outside, turn inside. Satin nickel, 60mm to 90mm. For doors people leave through. | 60 SNKT, 65 SNKT, 70 SNKT, 80 SNKT, 90 SNKT |
| Double key cylinder | 1 per door. Key on both sides. Not for exit doors. | 60 SNDK, 70 SNDK, 90 SNDK |
| Computer key cylinder | 1 per door. Photographed with five computer keys. Confirm key type and count on your quote. | 70 SNKT CP, 70 SNDK CP, 80 SNDK CP |
| Bathroom cylinder | 1 per door, 70mm. Turn inside, slot outside, no keyway. | 70 SNKT BK, 70 ACKT BK |
| Half cylinder | 1 per lock. Key on one side only. 45mm and 47mm, 33mm high. | 45 SNIK, 47 BSIK |
| Oval cylinder | 1 per lock. Solid brass, 6-pin, 3 keys, 30mm with extensions available. | Single oval cylinder |
| Rim cylinder | 1 per device. Flat tailpiece, 3 brass keys, doors up to 90mm. | X2 |
| Cylinder protector | 1 per outside face. Hardened steel, HRC58. Fixed from inside by through-bolt. | XF-1 |
Length against door thickness
Add the door thickness to the thickness of the trim on both faces, then take the next size up. The table uses 8mm trim on each side, the rose thickness of our 9003E lever. Measure your own trim and redo the sum, because a plate or a security escutcheon changes the answer.
| Door | Door plus 16mm trim | Key and turn (KT) | Double key (DK) |
|---|---|---|---|
| 35mm to 44mm | 51mm to 60mm | 60mm | 60mm |
| 45mm to 49mm | 61mm to 65mm | 65mm | 70mm |
| 50mm to 54mm | 66mm to 70mm | 70mm | 70mm |
| 55mm to 64mm | 71mm to 80mm | 80mm | 80mm |
| 65mm to 74mm | 81mm to 90mm | 90mm | 90mm |
| Over 74mm | Over 90mm | Send your drawing | Send your drawing |
Read the split, not only the total
- The 10 in the middle is the section that carries the cam, and the fixing screw sits at its center.
- So 30 / 10 / 30 and 35 / 35 are the same cylinder written two ways. State which way you are writing it.
- Every split we draw is equal on both sides.
- If the lock case is not in the middle of the door, measure from the fixing screw hole to each outer trim face. Then send both figures, and an uneven split is confirmed against your drawing.
| Total length | Drawn as | Fixing screw to each end |
|---|---|---|
| 60mm | 25 / 10 / 25 | 30mm and 30mm |
| 70mm | 30 / 10 / 30 | 35mm and 35mm |
| 80mm | 35 / 10 / 35 | 40mm and 40mm |
| 90mm | 40 / 10 / 40 | 45mm and 45mm |
Profile: what fits the hole in your lock
54 SNDK looks like a short euro cylinder in a list, but it is not one. Check the size before you count it as the next step down from 60mm.
| Profile | Size | Goes into | Models |
|---|---|---|---|
| Euro profile | 33mm high, 17mm head, 10mm neck as drawn | A lock case with a euro cutout | 60mm to 90mm series, half cylinders 45mm and 47mm |
| Small oval | 28mm high, 13mm wide, 54mm long as drawn | An oval hole of that size. It will not pass a 10mm euro neck | 54 SNDK |
| Oval | 30mm long, extensions for thicker doors | An oval hole, with zinc alloy or ABS fittings | Single oval cylinder |
| Rim | Flat tailpiece, doors up to 90mm | A rim lock or a panic exit device | X2 |
| Rose and thumbturn set | 44mm rose | Sold as a key cylinder with an interior thumbturn | D104 SS |
Key type: 70 SNKT is one of four products
The turn goes on the inside face. A double key cylinder needs a key to get out, so it must not go on an exit door: the International Building Code and NFPA 101 both restrict that. If in doubt, order KT and confirm with your local authority.
- KT means key and turn. We list it in 60mm, 65mm, 70mm, 80mm and 90mm.
- DK means double key. We list it in 60mm, 70mm, 80mm and 90mm, with no 65mm.
- BK means bathroom: 70 SNKT BK and 70 ACKT BK have a slot where the keyway would be, so do not order them for a door that needs a key.
- Finish letters: SN satin nickel, PB polished brass, BS satin brass, MB matt black, AB antique brass, AC antique copper, BN black nickel.
- CP has two meanings: in 60 CPDK it is the chrome finish, and at the end of 70 SNDK CP it marks the version photographed with computer keys.
| Code | One side | Other side | Use |
|---|---|---|---|
| 70 SNKT | Key | Turn | Doors people leave through |
| 70 SNKT CP | Key, photographed with computer keys | Turn | As above, with dimple keys |
| 70SNKT CP-ANTI-THEFT | Key, photographed with computer keys | Turn | As above. Ask what the protection covers |
| 70 SNKT BK | Slot, no key | Turn | Bathroom |
| 70 SNDK | Key | Key | Only where a key inside is allowed |
| 45 SNIK | Key | Nothing, half cylinder | Locks worked from one side |
The keying request
- Keys: we list 3 or 5 keys per cylinder, so state which.
- Computer keys are an option on the brass cylinders.
- Keyed alike is listed on the Single oval cylinder.
- For euro cylinders, keyed alike and master keying are not stated on the listing, so send the schedule and have it confirmed before production.
- Decide before you order. Cylinders made to differ cannot join a master system later without being repinned.
| Request | What it means | What to send |
|---|---|---|
| Keyed to differ | Every cylinder has its own key | Quantity only |
| Keyed alike | One key opens a group of cylinders | The list of doors in each group |
| Master keyed | Each door has its own key and one key opens them all | A key schedule: door numbers, who holds which key |
Quantities per door
| Line | Per door | Note |
|---|---|---|
| Cylinder | 1 per lock case | Photographed with a fixing screw |
| Keys | 3 or 5 per cylinder | Add spares to the order, not after delivery |
| Cylinder protector XF-1 | 1 per outside face, if wanted | Hardened steel, HRC58, through-bolt fixing from inside |
| Rim cylinder X2 | 1 per panic device or rim lock | Only where outside access is wanted |
What goes wrong on site
- Length chosen from the door alone: the trim was forgotten and the cylinder sits short.
- Too short: the trim covers the end and the key cannot seat fully.
- Too long: the end stands proud of the door, where it can be gripped.
- Turn fitted on the outside: anyone can open the door.
- Cam not lined up: turn the key slightly until the cam sits inside the body, then slide the cylinder into the case.
- Key left in the inside of a double cylinder: on many designs the outside key then will not turn.
- Oil or paint on the cylinder: it collects dirt. Use a dry lubricant.
What to send
- Door thickness and trim thickness on each side.
- Lock case model, or a photo of the cutout.
- Profile: euro, oval or rim.
- Length as a total, and as a split if the case is off center.
- Key type: KT, DK or bathroom.
- Finish.
- Keys per cylinder: 3 or 5, standard or computer.
- Keying: to differ, alike or master, with the door list.
Questions buyers ask
How do I measure a euro cylinder?
Measure from the fixing screw hole to each end, and add the two figures for the total. Do not measure only the visible part, and do not read 30 / 10 / 30 as 30 and 40.
What length do I need for a 40mm door?
With 8mm trim on each side the sum is 56mm, so order 60mm. With thicker trim, redo the sum. If your trim adds up to more than 20mm, the next size is 65mm for key and turn or 70mm for double key.
Single or double cylinder for an entrance door?
Use key and turn on any door people must leave through, because nobody can be locked in. Use double key only where the local code allows a key inside, and confirm that with your local authority first.
Is an ANTI-THEFT cylinder anti-snap?
ANTI-THEFT is part of the model name, and the listing does not itemize the protection. If your project calls for a named protection, send the requirement and have it confirmed before you order.
Can different lengths share one key?
State that in your keying request with the door list, and have it confirmed before production. Keying is decided when the cylinders are made, so it cannot be added after delivery.
Sources
Codes change and vary by place. Confirm with the authority for your project.