Spring bar conundrum: what’s the benefit here?

[M'Bob]

These two spring bars are advertised as being for pierced lugs. They have vey similar specifications, but one is shoulderless on both sides, whereas one has a single shoulder on one side:





My question: what’s the benefit having one side with a single shoulder? Easier to remove?

 

[Larry S]

M'Bob

These two spring bars are advertised as being for pierced lugs. They have vey similar specifications, but one is shoulderless on both sides, whereas one has a single shoulder on one side:





My question: what’s the benefit having one side with a single shoulder? Easier to remove?

That would be my guess.

 

[p4ul]

Could it be that the shoulder side is sprung and the other not, making the bar stronger??

 

[M'Bob]

I believe they’re both sprung. Could be wrong though.

 

[reverbtime]

I used to hate springbars that were shoulderless (like the Seiko OEM fat springbars of the SKX/Monster); but now I love them. They are much harder to remove (even with a decent springbar tool remover tool); but that's the whole point. I feel much more secure and confident that the springbar will remain there if anything gets caught in it's way.

 

[josiahg52]

Both sections are sprung, it's not a shoulder. At least that's the case on the ones I've come across.

 

[Davidt]

I always assumed it was to allow them to be shortened by a greater amount. If a longer pin of the same diameter was used it wouldn’t be as secure. Equally a wider pin can’t be used for the full length of the sprung part as it won’t fit the lug hole.
No idea if that’s the actual answer though.

Edited: Apr 12, 2024