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What Is The Difference Between OD vs ID Tube?

The Metal Company stock a range of OD (outside diameter) and ID (inside diameter) tube. So what’s the difference? 

Dairy Tube, General Purpose Tube and Metric Press-fit Tube is measured and named according to the outside diameter of the tube, which includes the wall thickness. For example, a 6” Piece of dairy tube measures exactly 6 inches or 152.4mm across from the outside of the wall to the opposite outside wall. This is the standard way to measure all the tube and tube fittings we stock, from ¼” right up to 8”.

In New Zealand, Spiral Welded Tube is measured according to the Internal Diameter. This is from the internal of one wall to the opposing wall, inside the tube and excluding the wall thickness. For example, this means an 8” piece of Spiral Weld Tube measures exactly 8” or 203.2mm across the internal diameter of the tube. We stock fittings that suit internally measured Spiral Weld for 8”, 10” and 12” sizes.

At 8”, The Metal Company stock fittings to fit both OD Measured Tube and ID Measured Spiral Weld Tube. This means it’s important to know the correct measurements for the system you are working with to ensure you get the right fittings. 

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More Videos About Tube

What Is The Difference Between OD vs ID Tube?

The Metal Company stock a range of OD (outside diameter) and ID (inside diameter) tube. So what’s the difference? 

Dairy Tube, General Purpose Tube and Metric Press-fit Tube is measured and named according to the outside diameter of the tube, which includes the wall thickness. For example, a 6” Piece of dairy tube measures exactly 6 inches or 152.4mm across from the outside of the wall to the opposite outside wall. This is the standard way to measure all the tube and tube fittings we stock, from ¼” right up to 8”.

In New Zealand, Spiral Welded Tube is measured according to the Internal Diameter. This is from the internal of one wall to the opposing wall, inside the tube and excluding the wall thickness. For example, this means an 8” piece of Spiral Weld Tube measures exactly 8” or 203.2mm across the internal diameter of the tube. We stock fittings that suit internally measured Spiral Weld for 8”, 10” and 12” sizes.

At 8”, The Metal Company stock fittings to fit both OD Measured Tube and ID Measured Spiral Weld Tube. This means it’s important to know the correct measurements for the system you are working with to ensure you get the right fittings. 

Related Products

More Technical Tuesday Videos

FlexiFlow: Stainless Steel Braided Flexible Hose 

FlexiFlow: Stainless Steel Braided Flexible Hose {{ vc_btn: title=%3Cstrong%3EView+our+other+videos%3C%2Fstrong%3E&style=custom&custom_background=%233f87b0&custom_text=%23ffffff&shape=square&css=.vc_custom_1659674777049%7Bmargin-bottom%3A+50px+%21important%3B%7D&link=url%3Ahttps%253A%252F%252Fwww.themetalcompany.co.nz%252Fvideo-gallery%252F%7C%7C%7C }} FlexiFlow: Stainless Steel Braided Flexible Hose {{ vc_btn: title=%3Cstrong%3EView+our+other+videos%3C%2Fstrong%3E&style=custom&custom_background=%233f87b0&custom_text=%23ffffff&shape=square&css=.vc_custom_1693353071744%7Bmargin-bottom%3A+50px+%21important%3Bpadding-right%3A+10%25+%21important%3Bpadding-left%3A+10%25+%21important%3B%7D&link=url%3Ahttps%253A%252F%252Fwww.themetalcompany.co.nz%252Fvideo-gallery%252F%7C%7C%7C }} ABOUT   >   VIDEOS FlexiFlow: Stainless Steel Braided Flexible Hose The Metal Company stock both PTFE and stainless steel convoluted flexible braided hoses. And yes, we hold these in stock ready for dispatch over night.    [...]

RapidPress Deburrer Tool | RapidPress Rundown

The RapidPress Deburrer Tool is designed for use on RapidPress tube from 15-54mm but can also be used on other stainless tubes or pipes. Watch Patrick discuss what the deburrer tool is and how to use it.

RapidPress Rotary Tube Cutter | RapidPress Rundown

The RapidPress rotary tube cutter is our preferred method of cutting tubes from 15mm – 76mm as it leaves a burr free edge on the external of the tube. Watch Patrick discuss how to use this tool.

RapidPress Expansion Bellows | RapidPress Rundown

When pipelines are heated or cooled it can cause them to expand or contract in length. If this is not compensated for it can put extreme pressure on welds or pressed joints resulting in failure. Watch Patrick discuss our RapidPress Expansion Bellows.

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