Wrench Sizes Chart

Last update: March 22, 2022

There are several types of wrenches, each with its own purpose. Wrenches come in different shapes and sizes.

Some wrenches are designed specifically for automotive applications, while others are meant for general household uses.

Luckily, as you’re not considering different ratchet drive sizes, the correct size of wrench you should be using is slightly easier to figure out.

Wrench sets will have a number of different sizes within them, so you won’t necessarily have to purchase more wrenches that aren’t in your toolbox.

Today we’ll be looking at wrench sizing and how you go about working all of these numbers and letters out.

How Wrenches Are Sized

There are two different methods of sizing wrenches – the standard method (SAE) and the metric sizing. In wrench sets, they will be all positioned in order from smallest size to largest.

SAE and metric nuts and bolts will need to be used with the corresponding wrench sizes. For example, an SAE nut will need to be used with an SAE wrench to ensure that you get the correct fit.

Similarly, a metric bolt should be used with a metric-sized wrench.

Alternatively, you can use a wrench sizing chart to convert SAE sizes to metric sizes, and vice versa.

This means that you’ll be able to use SAE and metric wrenches interchangeably with most kinds of nuts and bolts.

Wrench Sizes In Order

Standard sizing in America are as follows: 5/8, 19/32, 9/16, 1/2, 7/16, 3/8, 11/32, 5/16, 9/32, 1/4, 7/32, 3/16, 5/32, and 1/8. These are set out from the smallest wrench to the largest, and you will be able to buy these wrenches individually or in wretch sets.

Wrench Size Chart

Below is the wrench size chart for both SAE and metric sizes. You can use this to convert wrench sizes from one way of measuring it to another.

The bolt diameter is another term for the amount of space between the two prongs of a wrench. This diameter will be the same as the nut or bolt that it can be used with. Use this to work out which nut and bolt the wrench can be used with.

Wrench Sizes Chart

Bolt DiameterMetric Wrench SizeStandard Wrench Size (SAE)
1/8″8 mm5/16″
3/16″10 mm3/8″
1/4″11 mm7/16″
5/16″13 mm1/2″
3/8″14 mm9/16″
7/16″16 mm5/8″
1/2″19 mm3/4″
9/16″21 mm13/16″
22 mm7/8″
5/8″24 mm15/16″
25 mm1″
3/4″29 mm1-1/8″
32 mm1-1/4″
7/8″34 mm1-5/16″
35 mm1-3/8″
1″38 mm1-1/2″
41 mm1-5/8″
1-1/8″43 mm1-11/16″
45 mm1-3/4″
1-1/4″48 mm1-7/8″
1-3/8″51 mm2″
1-1/2″57 mm2-1/4″
1-5/8″64 mm2-1/2″
1-3/4″67 mm2-5/8″
70 mm2-3/4″
1-7/8″75 mm2-15/16″
76 mm3″
2″80 mm3-1/8″
83 mm3-1/4″
2-1/4″89 mm3-1/2″
95 mm3-3/4″
2-1/2″99 mm3-7/8″
102 mm4″
2-3/4″108 mm4-1/4″
114 mm4-1/2″
3″118 mm4-5/8″
3-1/4″127 mm5″
3-1/2″137 mm5-3/8″
140 mm5-1/2″
3-3/4″146 mm5-3/4″
152 mm6″
165 mm6-1/2″
178 mm7″

Wrenches According To Socket Sizes

Now that you have the conversion chart for your wrench sizes, let’s take a deeper look into standard sizing.

This is the most common sizing that modern wrenches are made under, so it makes sense to have as much information on this sizing as possible.

Below is a table of SAE socket sizes. These refer to SAE tools, sockets, and bolts.

SAE Socket Sizes
1/4” Drive3/8” Drive1/2” Drive3/4” Drives1” Drives
5/32″1/4″3/8″7/8″1-5/8″
3/16″5/16″7/16″15/16″1-11/16″
7/32″3/8″1/2″1″1-3/4″
1/4″7/16″9/16″1-1/16″1-13/16″
9/32″1/2″19/32″1-1/8″1-7/8″
5/16″9/16″5/8″1-3/16″2″
11/32″5/8″21/32″1-1/4″2-1/8″
3/8″11/16″11/16″1-5/16″2-3/16″
7/16″3/4″3/4″1-3/8″2-1/4″
1/2″13/16″25/32″1-7/16″2-3/8″
9/16″7/8″13/16″1-1/2″2-1/2″
15/16″7/8″1-5/8″2-5/8″
1″15/16″1-11/16″2-3/4″
1″1-3/4″2-15/16″
1-1/16″1-13/16″3″
1-1/8”1-7/8”3-1/8”
1-3/16″2″
1-1/4”2-1/8”
1-1/2″2-3/16″
2-1/4”

Converting SAE Sizes To Metric Sizes

If you need to convert metric sizes from standard sizing, you can use the chart below to help with that.

Bear in mind that metric sizes don’t always relate completely to imperial sizes, but there are different socket sizes from both methods of sizing that correlate quite closely to one another.

When converting SAE sizes to metric sizes, you will need to convert them between inches and millimeters. This chart can help you to convert sizes in regard to wrenches, sockets, and other tools as well.

Wrench Sizes Chart

Standard To Metric Sizing Conversions
SAE SizesMetric SizesSimilar Socket Sizes
5/32”4 mm5/32” and 4 mm are almost the same
4.5 mm
3/16”
5 mm
5.5 mm
7/32”
6 mm
1/4”
6.5 mm
7 mm
9/32”
5/16”5/16” and 8 mm are almost the same
8 mm
11/32”
9 mm
3/8”
10 mm
13/32”
11 mm7/16” and 11 mm are almost the same
7/16”
15/32”15/32” and 12 mm are almost the same
12 mm
1/2”
13 mm
17/32”
14 mm
9/16”
15 mm19/32” and 15 mm are almost the same
19/32”
5/8”
16 mm
21/32”
17 mm
11/16”
18 mm
23/32”19 mm3/4” and 19 mm are almost the same
3/4”
25/32”
20 mm
13/16”
21 mm
27/32”
22 mm
7/8”
23 mm29/32” and 23 mm are almost the same
29/32”
15/16”
24 mm
1”

Summary

We hope that our article today has been of use to you. Remember to bookmark this page and come back to it any time that you need to work out a conversion for your wrenches, sockets, or other tools.

Different methods of sizing can be frustrating and annoying to people who are just trying to get a job done, but we hope that our charts today can be helpful with that moving forward.