Novice question - SC4 cylinder differences?

[ACEd]

I have a bunch of SC1/SC4 cylinders with some differences - trying to figure out what fits what and significance of differences.

First came from a Schlage B series single sided deadbolt. I don't know if it was original, but it has screw on tail piece retainer with a distinct undercut slot in the back of plug - it had flat base tail piece with a C shaped washer that fixed tail piece rotation to pin. The undercut was not functional as it came out so I am guessing it had been changed earlier. It also has a hole at bottom of one side of undercut slot.

Second is essentially same but without the undercut slot. Pin is on opposite side of keyway. I used this to replace original cylinder in the B500 and it works fine.

Third is an odd cylinder that is identical to one in a no-name Schlage handset clone. Opposite the bible, it has a short extension that probably fits into a handle to secure it on opposite side. Instead of screw on retainer, it has a lockring that secures tail piece into cutout slot in back of cylinder. As I said it is same as one that I would like to rekey in door knob but I have not figured how to get it out of knob.

I have pictures if someone can tell me how to post.

Any help in identifying and getting last cylinder out would be appreciated.

Best, Ed

[billdeserthills]

The significant difference is the SC-1 key is a 5 pin length keyblank and it fits a 5-pin lock. The SC-4 keyblank is a 6 pin length keyblank that doesn't fit a 5 pin lock properly
Any other differences You have found are really only found on copycat cylinders

[ACEd]

Thanks - I understand SC1 vs SC4 - all these are 6-pin cylinders - trying to understand differences in outside - snap ring vs screw cap, notched vs flat end of plug etc

[billdeserthills]

Thanks - I understand SC1 vs SC4 - all these are 6-pin cylinders - trying to understand differences in outside - snap ring vs screw cap, notched vs flat end of plug etc

Well, I'm sure companies that use a snap ring do so to save $$ over the way schlage does it

[ACEd]

Is there an easy way to post pictures?

[ACEd]

OK - I think I figured out the pictures - now we'll see.

Assuming they come thru note the lower extension on the leftmost cylinder in top photo and rightmost in 2nd photo. What do these fit?

In second picture note the slot in middle cylinder - it appears to be for a tailpiece like the snap ring cylinder but it came out of a Schlage B560

The leftlost in middle picture is also Schlage and works fine in the B560 with flat tailpiece base.

I'm guessing the leftmost 2 are old and new Schlage while the one with the bottom extension is something else.

Any help appreciated.

[Zenophryk]

The screw on back is a standard 5 pin Schlage deadbolt cylinder. The 5 pin door knob cylinders use a c clip. the 6 pin cylinders have the clips which server to hold plug in and hold the tail piece in.
From what I've seen in cylinders that I have, the 5 pin deadbolt cylinders will have top spool pins in them.

Does that help at all?

-Zenophryk

[jeffmoss26]

The one with the tailpiece and C clip is for a lever, I want to say maybe Arrow.

[cledry]

No, the one with the C-clip is a knob cylinder for an import such as LSDA GR2 knob, the same cylinder can be used on a lever but with a shorter twisted tailpiece.

[jeffmoss26]

I was close...kind of! Thanks for the info.