Balance Spring, non-tilt

Quick Learner from Georgetown, TX

Sep 25, 2026 11:17 pm

Hoping you can indentify this balance spring. It's a 29", 1/2" metal channel, stamped with 28 4 OP BSI. As you suggest, since one is bad, I'll order 2. I've ordered from you before.

3 user uploaded images

9 Replies

Bob from SWISCO

Sep 27, 2026 7:13 am

Hey there. Looks to me you have either the S380-29 or S385-29 Channel Balances, depending on the shoe depth. See below. For a stamp option choose 2840.

Comparison of the S378, S380 and S385 balance shoes.

Quick Learner from Georgetown, TX

Sep 27, 2026 1:19 pm

Bob,
Thanks! From your pictures, I'm guessing it's S380, but am sending another pic just to be sure.
Wayne

1 user uploaded image

Bob from SWISCO

Sep 27, 2026 8:42 pm

Hi Wayne. If including the wings makes it 1-3/32", then it's a Series 385. Just double-check to be sure. Let us know if you have further questions.

Quick Learner from Georgetown, TX

Sep 27, 2026 9:24 pm

Bob,
Thanks so much! They are ordered.
Wayne

Bob from SWISCO

Sep 27, 2026 11:45 pm

Great Wayne! Let us know if you have further questions.

Quick Learner from Georgetown, TX

Sep 28, 2026 8:42 am

Just one: Is there any place on your website where I can find detailed information like this? I feel badly taking up your time if there was a place I could have found the info.
Appreciate all your help!
Wayne

Bob from SWISCO

Sep 30, 2026 11:26 am

Just our catalog pages, otherwise asking us is the best way to identify hardware. It's not taking up our time at all; in fact, that's what we're paid to do!

Never hesitate to reach out if you need our assistance, that's what we do.

Quick Learner from Georgetown, TX

Sep 30, 2026 9:53 pm

Sounds good, thanks so much for being such a great help!
Wayne