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Old 22 January 2010, 04:25 PM   #1
Coroner
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Spring pin strength

How much force, psi, or torque can a spring bar on a sub take? Could wearing the watch too tight and then flexing of your wrist ever create enough force to cause pin damage?
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Old 22 January 2010, 11:45 PM   #2
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Quote:
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How much force, psi, or torque can a spring bar on a sub take? Could wearing the watch too tight and then flexing of your wrist ever create enough force to cause pin damage?
I would most seriously doubt it a few years back I was left dangling over the side of a dive boat.My SD bracelet got caught up it held my almost 15 stone weight for several minutes before lug pin failed.And a good job it did watch was lost to the abyss but I still got my wrist.
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Old 22 January 2010, 11:51 PM   #3
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Cheap pins will bend, and break easily. The major brands tend to have more solid pins that handle plenty of abuse. Your Rolex should have strong ones from the factory. Don't go cheap!
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Old 23 January 2010, 03:01 AM   #4
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SEL's capture the main body of your spring-bar, so bending is unliikely at the SEL... the strength then, relies on the shear strength of the pivot pin at the end of the bar..

on an SEL that pin diameter is .88mm, and the shear strength could probably be found for a ss rod of that small diameter.. On the lug-hole cases the spring bar pivot is 1.2mm, but because the non-SEL capture tube is narrower than the capture area of an SEL, there is likely to be some flex of the bar..

The bracelet is most likely to fail at the connection point of the bracelet/clasp rivet where torsional loads would be highest.......
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Old 23 January 2010, 04:27 AM   #5
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Watchmaker at this forum recently said this on a thread where different questions where asked to him in his capacity as a Rolex watchmaker:

"I will say though, with a new set of springbars installed, I have seen a SD support 120Kg of weight. Not an official test I must ad. But I saw it with my own eyes."

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Old 23 January 2010, 08:17 AM   #6
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Thanks for all the informative responses.
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Old 23 January 2010, 05:09 PM   #7
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These replies are good news, I was a little worried. I bent the ends of both of my springbars putting on a NATO strap.....didn't seem like much force was exerted at all.
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Old 24 January 2010, 03:04 AM   #8
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These replies are good news, I was a little worried. I bent the ends of both of my springbars putting on a NATO strap.....didn't seem like much force was exerted at all.
NATO's do not capture the main body of the spring bar... enough force and you can tear the spring-bar body at the ends where the pivots are inserted and rip the spring-bar off the watch..

Original issue watches for NATO style straps had solidly welded bars...
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Old 2 December 2011, 09:47 AM   #9
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I think the weakest of a bracelet is the rivet of the clasp
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Old 9 December 2017, 12:06 AM   #10
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Quote:
Originally Posted by Tools View Post
SEL's capture the main body of your spring-bar, so bending is unliikely at the SEL... the strength then, relies on the shear strength of the pivot pin at the end of the bar..

on an SEL that pin diameter is .88mm, and the shear strength could probably be found for a ss rod of that small diameter.. On the lug-hole cases the spring bar pivot is 1.2mm, but because the non-SEL capture tube is narrower than the capture area of an SEL, there is likely to be some flex of the bar..

The bracelet is most likely to fail at the connection point of the bracelet/clasp rivet where torsional loads would be highest.......
Quote:
Originally Posted by Tools View Post
NATO's do not capture the main body of the spring bar... enough force and you can tear the spring-bar body at the ends where the pivots are inserted and rip the spring-bar off the watch..

Original issue watches for NATO style straps had solidly welded bars...
I understand that if the NATO is narrower than the lug width but otherwise if properly sized it covers the whole spring bar and the force evenly distributed what s the difference then between Nato vs bracelet end link or leather strap?thanks
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Old 31 December 2017, 02:33 PM   #11
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A friend of mine was Wind Surfing and caught his Strap on a fixture of the Sail. The Strap broke(he thinks)or the Spring Pin. All he heard was "Blub" A Rolex will Not Float ! Have a Watch Maker inspect your Pins every so often. Don't wait for the five year service.
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