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 Sizing Gauge Slide Style National Type TELESCOPING O-Ring Gauge (Blue)

O-Ring Sizing Gauge Slide Style National Type TELESCOPING O-Ring Gauge (Blue)

Product ID: 436393252

Details

Brand
BUSY-CORNER
Colour
Blue
Material
Plastic
Nominal outside diameter
13 Inches
UPC
722794896965

📏Covers AS568 O-Ring sizes 001-050, 102-178, 201-279, 309-382, 425-455

🔵Durable blue plastic build for easy visibility

🧰Compact telescoping slide fits in any toolbox

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553 kr

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Description

📏 Measure Like a Pro, Size Like a Boss!

COMPACT PORTABLE - Sleek telescoping design slips effortlessly into your toolbox or bag—ready for on-the-go professionals.
USER FRIENDLY OPERATION - Effortless slide mechanism makes sizing quick and intuitive, saving you valuable time on the job.
VIBRANT BLUE VISIBILITY - Striking blue finish ensures you never lose sight of your gauge during critical measurements.
PRECISION SIZING MASTERY - Instantly identify AS568 O-Ring sizes across five extensive ranges for flawless fits every time.
TRUSTED INDUSTRY STANDARD - Backed by Delson Rubber & Hardware Tools, delivering reliable accuracy with every slide.

The O-Ring Sizing Gauge Slide Style by BUSY-CORNER is a precision tool designed for AS568 O-Rings, covering a broad range of sizes from 001 to 455. Its durable blue plastic telescoping slide fits conveniently in toolboxes, offering quick, accurate measurements trusted by industry professionals. With a 4.6-star rating and compact design, it’s the essential gauge for millennial managers who demand efficiency and reliability on the job.

Specifications

ASIN	B08BHR6GG8
Best Sellers Rank	99,828 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 326 in O-Rings
Brand	BUSY-CORNER
Colour	Blue
Customer Reviews	4.6 out of 5 stars 125 Reviews
Manufacturer	Delson Rubber & Hardware Tools PTE.LTD
Manufacturer Part Number	o ring gauge blue
Material	Plastic
Model Number	o ring gauge blue
Nominal Outside Diameter	13 Inches
Nominal outside diameter	13 Inches
Set Name	O-Ring Set
UPC	722794896965
Unit Count	1.0 count

Reviews

R**4

Works as expected

Bought for work, seems to work fine, hasn’t been used in anger. Bigger than expected

28.05.2026

J**K

O ring gauge

Great gauge for finding o ring size. Fits in a tool box or bag. Easy to use.

29.12.2025

J**E

Works as intended.

Measures o rings nicely just don't stretch the o ring to far or you will get a misreading.

3.03.2025

F**L

Inaccurate

The gauge read two sizes smaller. The size for a 025 o' ring is shown on the chart as ID 29.87 mm . The vernier caliper measured ID as 33 mm which is for a 027 o' ring. O well, I guess I will have to estimate it up or I might consider returning the tool

8.11.2022

C**T

Handy tool

Easy to sue, seems pretty accurate as long as you get a feel for how much tension to use. Identifies tons of different o ring sizes. Quality is fine for what it is, easy to read and should hold up well.

11.01.2023

M**V

Covers a large number of different sizes.

Now i can have assurance I am reading the correct size. This tool will save me a load of angst!

31.07.2023

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553 kr

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In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

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