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Bobareno · 18 April 2008, 01:13 AM

I see lots of new Rolex models with the triple crown lock, but how good was the older twin crown lock? I have read that the triple can keep water out even with the stem un-screwed, what about the twin?

Tools · 18 April 2008, 01:18 AM

The Twinlock is waterproof if left unscrewed too. Just not to the same amount of underwater pressure..

Here's a breakdown of the Twinlock:

You see, the "O" ring around the stem is always there to keep out water and dirt. The gasket in the crown acts like the seal on a jar when screwed down ( hence, twin locks), so either one will protect, but both together are best.

Problems happen when the "O" ring gets old and stiff or cracks. Water can then get past the stem if the crown is loose.

Bobareno · 18 April 2008, 01:26 AM

WOW, great info. Thank You!

JostheBoss · 18 April 2008, 01:26 AM

Thanks Larry! Hmmm...coming to think of it, are there any Twinlock pieces left in production?

Tools · 18 April 2008, 01:32 AM

Quote:

Originally Posted by JostheBoss

Thanks Larry! Hmmm...coming to think of it, are there any Twinlock pieces left in production?

Sure...DJ's, Air-Kings, The Explorer and the Explorer II, all the mid-size, all the ladies...probably some others too.

Trurolexer · 18 April 2008, 01:42 AM

Quote:

Originally Posted by Bobareno

WOW, great info. Thank You!

100% agree!!! Thanks Larry!!!

Iuio · 18 April 2008, 02:02 AM

GMTs (I & II) also have Twinlocks except GMT IIc that has Triplock

SPACE-DWELLER · 18 April 2008, 02:18 AM

Good chart!

The Triplock designation is strange in a way since there are actually four seals including the O-ring.

(Pic by Larry).

(Pic from my Photobucket, source unknown).

"Exploded" Triplock:

(Pic from my Photobucket, source unknown).

Tools · 18 April 2008, 03:30 AM

Here ya' go Spacey...

The Triplock with all the pertinent stuff...

(Stem "O"-rings, tube "O"-ring, and Crown gasket; hence Triplock)

SPACE-DWELLER · 18 April 2008, 03:35 AM

Cool, Larry!

f16570 · 18 April 2008, 06:36 AM

Never heard of any issues with either the Twin or Triple lock. Both do as intended.

Warped · 2 May 2008, 03:41 AM

Great info and pics. Thanks guys.

18 April 2008, 01:13 AM	#1
Bobareno Member Join Date: Dec 2007 Location: Phoenix Posts: 739	How good is/was the double crown lock? I see lots of new Rolex models with the triple crown lock, but how good was the older twin crown lock? I have read that the triple can keep water out even with the stem un-screwed, what about the twin?

18 April 2008, 01:18 AM	#2
Tools TRF Moderator & 2024 SubLV41 Patron Join Date: May 2007 Real Name: Larry Location: Mojave Desert Watch: GMT's Posts: 43,515	The Twinlock is waterproof if left unscrewed too. Just not to the same amount of underwater pressure.. Here's a breakdown of the Twinlock: You see, the "O" ring around the stem is always there to keep out water and dirt. The gasket in the crown acts like the seal on a jar when screwed down ( hence, twin locks), so either one will protect, but both together are best. Problems happen when the "O" ring gets old and stiff or cracks. Water can then get past the stem if the crown is loose. __________________ (Chill ... It's just a watch Forum.....) NAWCC Member

18 April 2008, 01:26 AM	#4
JostheBoss "TRF" Member Join Date: Oct 2007 Real Name: Jos Location: South Africa Watch: SS GMT IIc Posts: 741	Thanks Larry! Hmmm...coming to think of it, are there any Twinlock pieces left in production? __________________ Life isn't what it is...it's what it looks like

18 April 2008, 02:02 AM	#7
Iuio Member Join Date: Apr 2008 Real Name: Arturo Location: Somzée, Belgium Watch: DD 1803 '66 Posts: 20	GMTs GMTs (I & II) also have Twinlocks except GMT IIc that has Triplock

18 April 2008, 02:18 AM	#8
SPACE-DWELLER "TRF" Member Join Date: Apr 2007 Real Name: Bo Location: Denmark Watch: Rolex, of course! Posts: 22,436	Good chart! The Triplock designation is strange in a way since there are actually four seals including the O-ring. (Pic by Larry). (Pic from my Photobucket, source unknown). "Exploded" Triplock: (Pic from my Photobucket, source unknown). __________________ With kind regards, Bo LocTite 221: The Taming Of The Screw...

18 April 2008, 03:30 AM	#9
Tools TRF Moderator & 2024 SubLV41 Patron Join Date: May 2007 Real Name: Larry Location: Mojave Desert Watch: GMT's Posts: 43,515	Here ya' go Spacey... The Triplock with all the pertinent stuff... (Stem "O"-rings, tube "O"-ring, and Crown gasket; hence Triplock) __________________ (Chill ... It's just a watch Forum.....) NAWCC Member

18 April 2008, 03:35 AM	#10
SPACE-DWELLER "TRF" Member Join Date: Apr 2007 Real Name: Bo Location: Denmark Watch: Rolex, of course! Posts: 22,436	Cool, Larry! __________________ With kind regards, Bo LocTite 221: The Taming Of The Screw...

18 April 2008, 06:36 AM	#11
f16570 "TRF" Member Join Date: Jan 2007 Real Name: F Location: Scotland Watch: Exp II White Face Posts: 4,272	Never heard of any issues with either the Twin or Triple lock. Both do as intended. __________________ Why have what's new when you have what's best. f

2 May 2008, 03:41 AM	#12
Warped "TRF" Member Join Date: Jun 2007 Real Name: Dave Location: South Africa Watch: Where you're going Posts: 135	Great info and pics. Thanks guys. __________________ Dave.

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