SC1 Keyway

[CastleBravo]

Does anyone happen to know when the SC1 keyway was first made/used? (estimates are great too) Kind of random, but I need to find the answer for a research project and after scouring the internet for a few hours this is proving surprisingly difficult to find. Thanks

[cledry]

Good question. Schlage came out with the original A-line knob way back in 1923 but it used the old double-sided wafer lock. I have seen A-lines from the 1950s with the 1145 key. The cylinders may have been switched out though as they were the same design as we use now and which Schlage has used at least since the 1940s on their deadbolts.

To Schlage the SC1 or C keyway is known as the 1145. Perhaps that will help your search.

Let us know what you find.

[jeffmoss26]

I always thought 1145 was the Ilco number, and C is the Schlage keyway designation.

[Squelchtone]

I find Ingersoll Rand, owners of Schlage have very friendly reps, maybe give them a call and see if they have a historian on staff who could look this sort of thing up.

I always wanted to know the difference between keyway / profile / section are the 3 the same thing? I know that 5 and 6 pin key blanks will fit into the same keyway, but profiles and section have always been this mystery. and what is a sectional keyway as compared to a keyway?

I know we have some smiths here who really know this stuff.. cledry, can you help us make sense of it?

Thanks!
Squelchtone

[jeffmoss26]

From my experience:

Simplex keyways, one blank and one blank ONLY fit the lock. Yale Paracentric/Y1 is an example.
Sectional keyways, more than one blank fit the lock, with different levels of millings. Sargent L series is an example. While an LA blank will only fit an LA cylinder, an LD blank will fit LA, LB, and LC cylinders. There are more levels under that, with LN blanks fitting LA through LL cylinders.

[cledry]

I always thought 1145 was the Ilco number, and C is the Schlage keyway designation.

You are correct. i had a brain fart.

[cledry]

I find Ingersoll Rand, owners of Schlage have very friendly reps, maybe give them a call and see if they have a historian on staff who could look this sort of thing up.

I always wanted to know the difference between keyway / profile / section are the 3 the same thing? I know that 5 and 6 pin key blanks will fit into the same keyway, but profiles and section have always been this mystery. and what is a sectional keyway as compared to a keyway?

I know we have some smiths here who really know this stuff.. cledry, can you help us make sense of it?

Thanks!
Squelchtone

Ingersoll Rand has been replaced by Irish company Allegion.

Jeff is correct. here's a visual of a sectional key profile. Since we are discussing Schlage I'll stick with it.



Sectional keyways are useful in expanding a MK system. For example if your system is maxed out on C you could use the same key combinations over on a different section E etc. and make your TMK a Schlage L. This will allow a much larger system. The danger falls when a locksmith or hardware store doesn't stock the sectionals, esp. the more uncommon ones, so will use the L as a standby. Now that key might work another suite on another floor.

Today I had a customer who has all L4 section and wanted the HR guy to have a GMK that would open everything but the GMK is already issued to the maintenance super and he doesn't want anyone else in his office. The solution is to cut the GMK on a L, and put a L1 cylinder in the HR office door. A more secure way would be to have HR carry two keys, but he is too important for that.

[Divinorum]

I find Ingersoll Rand, owners of Schlage have very friendly reps, maybe give them a call and see if they have a historian on staff who could look this sort of thing up.

I always wanted to know the difference between keyway / profile / section are the 3 the same thing? I know that 5 and 6 pin key blanks will fit into the same keyway, but profiles and section have always been this mystery. and what is a sectional keyway as compared to a keyway?

I know we have some smiths here who really know this stuff.. cledry, can you help us make sense of it?

Thanks!
Squelchtone

Ingersoll Rand has been replaced by Irish company Allegion.

Jeff is correct. here's a visual of a sectional key profile. Since we are discussing Schlage I'll stick with it.



Sectional keyways are useful in expanding a MK system. For example if your system is maxed out on C you could use the same key combinations over on a different section E etc. and make your TMK a Schlage L. This will allow a much larger system. The danger falls when a locksmith or hardware store doesn't stock the sectionals, esp. the more uncommon ones, so will use the L as a standby. Now that key might work another suite on another floor.

Today I had a customer who has all L4 section and wanted the HR guy to have a GMK that would open everything but the GMK is already issued to the maintenance super and he doesn't want anyone else in his office. The solution is to cut the GMK on a L, and put a L1 cylinder in the HR office door. A more secure way would be to have HR carry two keys, but he is too important for that.

Question on the topic of referencing key ways by letter and then a number. As in L1 and L4, what exactly is this referring to? I get the letter portion of it, whats confusing me is the number after the letter.

[cledry]

Never really thought about it with the L1 and L4 for example. I just know what they look like and that one will not go into the other, but the L41 will enter both, and that the L4 is the current stocking keyway.

[jeffmoss26]

It's just a Corbin designation. The letter does not stand for anything.