How to read micrometer (ASM o-ring)

Lyscer · 04/03/2006, 07:32 AM

I'm trying to figure out how thick the o-ring on my asm g4 skimmer is so I can get a slightly thicker one because it is starting to leak. Does anyone know how to read these things? It started at the 0 did one full rotation and stopped at 40. What would that reading be?

Anemonebuff · 04/03/2006, 07:42 AM

I just make sure the O-ring is flush with the base of the cone. I also push down on the cup as I turn the cup. It rarely ever leaks.

der Riff-Konig · 04/03/2006, 07:46 AM

that reading is 143 thousands. 250 is a quarter of an inch. 125 is 1/8 of an inch.

dne63 · 04/03/2006, 04:39 PM

agree with the last post .0143 is correct

narow37 · 04/03/2006, 05:03 PM

actually dne63 it would be .143 not .0143.

Dubbin1 · 04/03/2006, 05:17 PM

Yup .143 I think you can figure out how to read it now

rayjay · 04/03/2006, 06:51 PM

Shouldn't really nit-pick I guess, but the picture shows measurement with a vernier caliper, not a micrometer.

Amphiprion · 04/03/2006, 07:00 PM

It should read in millimeters (mm), not micrometers (lowercase mu and then an m). for reference, a micrometer is roughly the size of a bacterium.

Lyscer · 04/03/2006, 08:29 PM

so would .143 of an inch be correct? Where is a good place to buy an o-ring?

rayjay · 04/03/2006, 08:31 PM

Looking at the scale in the picture, the scale is in .001" increments, that's thousands of an inch.
Metric ones DO read in mm.

rayjay · 04/03/2006, 08:55 PM

Try a hardware store or an automotive supply shop.
You need to know the inside diameter of the O ring as well as the thickness. You never mentioned the the diameter, only the thickness.
.143" is approximately 9/64 ths of an inch.
I don't remember the common thicknesses that O rings come in but something should be close to that.
Another problem is that the manufacture possibly had special size ones made, to stop people from using generic sized rings so you have to order the special ones from them.

04/03/2006, 07:32 AM	#1
Lyscer Registered Member Join Date: Nov 2005 Posts: 675	How to read micrometer (ASM o-ring) I'm trying to figure out how thick the o-ring on my asm g4 skimmer is so I can get a slightly thicker one because it is starting to leak. Does anyone know how to read these things? It started at the 0 did one full rotation and stopped at 40. What would that reading be? __________________ 68 Cadlights Versa 24" x 8 ATI Dimmable Sunpower 2 x Gyre XF-130 DIY Arduino Uno Controller with temp probes and 8 outlets ran from web interface ReefOctopus Skimmer and Eheim 1262 return Current Tank Info: 68 Cadlights Versa

04/03/2006, 07:46 AM	#3
der Riff-Konig Premium Member Join Date: Sep 2004 Location: New Mexico Posts: 686	that reading is 143 thousands. 250 is a quarter of an inch. 125 is 1/8 of an inch. __________________ People who think they know what they're doing are especially annoying to those of us who do. Current Tank Info: 125 with 30 sump, two 58's with 20 sumps. 55, two 30's.

04/03/2006, 06:51 PM	#7
rayjay Registered Member Join Date: Oct 1999 Location: London, Ontario, Canada Posts: 3,969	Shouldn't really nit-pick I guess, but the picture shows measurement with a vernier caliper, not a micrometer. __________________ Seahorses. Culture nanno, rotifers and brine shrimp. Current Tank Info: Seahorses

04/03/2006, 07:00 PM	#8
Amphiprion Premium Member Join Date: Jul 2005 Location: Mobile, AL Posts: 6,611	It should read in millimeters (mm), not micrometers (lowercase mu and then an m). for reference, a micrometer is roughly the size of a bacterium. __________________ You've done it now, haven't you? Current Tank Info: 40g breeder patch reef w/ seagrass; 2-250w XM 10K; Vortech MP40wES & MP10wES; BM Curve 7 skimmer; carbon & occasional GFO

04/03/2006, 08:29 PM	#9
Lyscer Registered Member Join Date: Nov 2005 Posts: 675	so would .143 of an inch be correct? Where is a good place to buy an o-ring? __________________ 68 Cadlights Versa 24" x 8 ATI Dimmable Sunpower 2 x Gyre XF-130 DIY Arduino Uno Controller with temp probes and 8 outlets ran from web interface ReefOctopus Skimmer and Eheim 1262 return Current Tank Info: 68 Cadlights Versa

04/03/2006, 07:42 AM	#2
Anemonebuff Registered Member Join Date: Feb 2001 Location: LI,NY Posts: 3,877	I just make sure the O-ring is flush with the base of the cone. I also push down on the cup as I turn the cup. It rarely ever leaks.

04/03/2006, 04:39 PM	#4
dne63 Registered Member. Join Date: Mar 2006 Location: north carolina Posts: 239	agree with the last post .0143 is correct

04/03/2006, 05:03 PM	#5
narow37 Registered Member Join Date: Aug 2004 Location: hilton head is SC Posts: 201	actually dne63 it would be .143 not .0143.

04/03/2006, 05:17 PM	#6
Dubbin1 Registered Member Join Date: Mar 2004 Location: Findlay, Ohio Posts: 11,540	Yup .143 I think you can figure out how to read it now

04/03/2006, 08:31 PM	#10
rayjay Registered Member Join Date: Oct 1999 Location: London, Ontario, Canada Posts: 3,969	Looking at the scale in the picture, the scale is in .001" increments, that's thousands of an inch. Metric ones DO read in mm. __________________ Seahorses. Culture nanno, rotifers and brine shrimp. Current Tank Info: Seahorses

04/03/2006, 08:55 PM	#11
rayjay Registered Member Join Date: Oct 1999 Location: London, Ontario, Canada Posts: 3,969	Try a hardware store or an automotive supply shop. You need to know the inside diameter of the O ring as well as the thickness. You never mentioned the the diameter, only the thickness. .143" is approximately 9/64 ths of an inch. I don't remember the common thicknesses that O rings come in but something should be close to that. Another problem is that the manufacture possibly had special size ones made, to stop people from using generic sized rings so you have to order the special ones from them. __________________ Seahorses. Culture nanno, rotifers and brine shrimp. Current Tank Info: Seahorses