Using the silhouette printed on the side of the gauge to identify smaller o-rings, do I use the outer or inner silhouette?

Nicholas, your o-ring should completely cover the white part of the silhouette. This is a bit tricky to do by eye. There's more to sizing an o-ring than comparing it to the silhouette. The Busy Corner o-ring gauge you're referencing is made for US sized o-rings. There are also metric, Japanese and British sizes. The only way to be sure of an o-ring's size is to measure the ID, OD and cross section with a caliper. For US o-rings, the numbers printed next to each silhouette on the gauge are called "dash" numbers. O-rings made to AS-568 specifications, no matter who the manufacturer is, will be the same size. So a -105 (dash 105) o-ring will have an inside diameter of .143, an outside diameter of .349 and a cross-section of .103. The first digit of a dash number tells you the cross section in decimal inches. 0 is .070, 1 is .103, 2 is .139, 3 is .210 and 4 is .275. Charts for US, metric, Japanese and British sizes are available on the internet. I likely gave you more info than you requested, but thought it may be of help to others.

does it measure in metric?

No,this oring gauge measure in Imperial(Inch) sizes.

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O-Ring Gauge Make Work Smart, Telescoping O Ring Sizing Plastic Gauge, Slide Style National Type, for Measuring O Rings Inner Diameter, OD, Thickness Gauge Blue

O-Ring Gauge Make Work Smart, Telescoping O Ring Sizing Plastic Gauge, Slide Style National Type, for Measuring O Rings Inner Diameter, OD, Thickness Gauge Blue

Product ID: 218137412

Details

Brand
BUSY-CORNER
Color
Blue
Material
Plastic
Nominal Inside Diameter
13 Inches
UPC
722794896965

📏Measures O-ring sizes up to 13" ID

🔄Telescoping slide for precise sizing

🔵Durable high-quality plastic build

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€ 53.16

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Measure Like a Pro, Never Miss a Fit!

COMPACT PORTABLE - Small, lightweight design fits perfectly in your toolkit or pocket for on-the-go measurements.
EFFORTLESS OPERATION - Slide-style gauge lets you measure inner diameter, outer diameter, and thickness without stretching the O-ring.
STREAMLINE YOUR WORKFLOW - Ideal for hydraulic, plumbing, and industrial pros who demand fast, reliable O-ring sizing every time.
PRECISION AT YOUR FINGERTIPS - Easily identify AS568/BS1806 O-ring sizes from 001 to 475 with unmatched accuracy.
PROFESSIONAL GRADE DURABILITY - Crafted from premium plastic to withstand daily use in busy workshops and repair shops.

The BUSY-CORNER Telescoping O-Ring Gauge is a compact, high-quality plastic tool designed for precise measurement of O-rings’ inner diameter, outer diameter, and thickness. Compatible with AS568 and BS1806 standards, it covers sizes from 001 to 475, making it indispensable for professionals in hydraulics, plumbing, and industrial maintenance. Its slide-style mechanism ensures accurate sizing without stretching, streamlining your workflow and eliminating guesswork.

Specifications

ASIN	B08BHR6GG8
Best Sellers Rank	#84,221 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #70 in Thickness Gauges
Brand Name	BUSY-CORNER
Color	Blue
Customer Reviews	4.7 4.7 out of 5 stars (162)
Manufacturer	BUSY-CORNER
Material Type	Plastic
Model	o ring gauge blue
Nominal Inside Diameter	13 Inches
Part Number	o ring gauge blue
UPC	722794896965
Unit Count	1.0 Count

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