Chubb 3K75 5 Lever Mortice Sash Lock in the non British Standard 3621 version of the popular Chubb 3K74 Mortice Sash Lock, again available in two sizes and two different finishes and backed by a massive 15 year guarantee.
Fire rated for use on 60 minute fire doors!
Mechanism : 5 Lever
Case Size : 67 or 80 mm
Follower : 8mm
Case Finish : Gold
Forend Finish : Brass or Satin Chrome
Keys Supplied 2 - Keying alike available
Rebate Kits available
Deadbolt is locked or unlocked by key from either side
Roller latchbolt withdrawn by lever handle from either side.
- Roller latchbolt means lock is suitable for fitting in doors both left and right hand hung, without modification
- Case Size: 2.5 inch
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Hi, guys. My name's Darrel. I'm head of the tech team here at LocksOnline.co.uk. Thanks for taking the time to tune in and have a look at one of our product reviews, and more importantly, the product that we're looking at today is the Union C-series 3K75 Mortice Sash Lock.
Before I start having a look at the product, the 3K75 is actually a Chubb lock. For whatever reason, when Assa Abloy bought Union and when they bought Yale and Chubb etc., they decided in their infinite wisdom to go and change all of the Chubb locks and rebrand them under the Union name. If you have this lock already fitted or you're thinking of wanting to fit this lock, in reality, as what Assa said, it's Chubb at heart. I love Chubb. I think the quality and the engineering around a Chubb lock if your budget will allow, thumbs up. Consider buying one.
Now, this particular one here, the 3K75, I'll go into a little more detail. This is non-British standard, guys, so you need to be aware of that. It's non-British standard. One of the things that doesn't make it British standard is the fact that it doesn't have an anti-drill plate on the outside on both sides. The anti-drill plate would help somebody trying to tap by drilling it out. They do do the 3K74 is the British standard version of this particular lock, should you want the British standard.
Under basic terms, this is the minimum security that you could expect to want to have on an external door these days in the UK. It does have some curtain protection. I don't know if you can zoom in there a little bit there. You can see that there's a silver little shroud there. What that's done is that's a lever curtain, we call in the industry. What that's designed to do is to stop anybody trying to manipulate, trying to pick the levers inside. That's what that actually does inside there.
Also as well, if I throw the bolt out for you, you will see there that on the bolt, we've got some little cams that sit inside the bolt there. What they're designed to do is if anybody tried to saw this bolt off and try and open the door, when the hacksaw hits one of those little cams there, the cam will start rotating and of course the hacksaw blade is going nowhere. It's not going to cut anymore. Eventually it will, a couple of days later if you're going backwards or forwards like that.
One of the distinct advantages and it's the only manufacturer that I'm aware of that does this, they use this roller bolt here. What this means is that you don't have to bother turning the latch around should you wish to hand it from the left-hand door or a right-hand door. This will obviously work in multi ways. I kind of like this and I kind of like the way that it's designed. By using the nylon on here, nylon is self-lubricating when it has a bit of water on it. You have a lot of pluses with this particular type of latch. Of course it rolls as well which is nice.
It comes as standard with two keys. One thing you need to be aware of as well is that the case depth and so forth on these particular type of locks are slightly different to the norm. All the measurements in regards to its size and so forth is available on our site. Just a couple of key pointers. It's available in either a 67 millimetre case depth — that's from there to there. That's the one that I have on with me now that we're talking about. Or they come in 80 millimetre, which means it's little more again.
The backset, which is the distance from here to either the follower, which is 8 millimetres or the key hole there, is this one here is 40 millimetres. If you went for the bigger one at 80, then that would extend that then to 53 millimetres. It comes back a little more on the door.
It comes standard with either a stainless steel finish or a brass finish as standard. The keep as well, people forget about the keep but the keep is just as important as the lock. As you can see here, it's all built in solid steel enclosed keep which is, again, this is actually a requisite of the British standard. There are quite a few requisites here on this particular type of lock that are up to British standard but unfortunately not all. Therefore, it can't have that kitemark.
There you go guys. This is the 3K75 which is Chubb. It's Chubb at heart, branded now under Union. If you're wanting to change your lock or it's worn out, then this here is the dead giveaway. Bear in mind that the 3K74 and the 3K75 will have this type of roller latch. To know the difference between the two, on the faceplate, you'll either see a kitemark or you won't to see if it's British standard.
From me, Darrel, I hope very much that this video has given you a little more insight into this particular type of lock in general, but if there's something that I haven't mentioned and you need a bit of information, feel free to pop us over an email or use our live chat online or pick up the phone and have a chat with us. We'd love to see you as a customer. From me, Darrel, and the rest of the team here, thanks for taking the time to watch this video and catch up with us real soon. Take care now. Bye-bye.