What size is a 10 wrench?
SAE Wrench Size | Bolt Size (SI) | Metric Wrench Size |
---|---|---|
5/16″ | 1/8″ | 8 mm |
3/8″ | 3/16″ | 10 mm |
7/16″ | 1/4″ | 11 mm |
1/2″ | 5/16″ | 13 mm |
Metric Fasteners - Wrench size needed for Driving common Nuts | ||
---|---|---|
Screw Size | Wrench Size * | Alt Size, Acorn *** |
M5 | 8mm | 8mm |
M6 | 10mm | 10mm |
M8 | 13mm | 13mm |
Socket Wrench
Most common are the 1/4-inch, 3/8-inch and ½-inch ratchet drivers, but ¾-inch and 1-inch sets are available for heavy-duty work.
To calculate the wrench size needed, you must first measure your bolt. Take the diameter of the bolt, and multiply by 1.5. This calculation and conversion factor is valid for either metric or standard bolt sizes. The resulting number will be the size of the wrench you need to adjust the bolt properly.
Shoulder Diameter (A) | Thread (C) | Head Diameter (E) |
---|---|---|
6mm | 5mm x 0.8 | 10mm |
8mm | 6mm x 1.0 | 13mm |
10mm | 8mm x 1.25 | 16mm |
12mm | 10mm x 1.5 | 18mm |
It seems like the 10mm bolt size is the most common bolt size across most cars so, naturally, you're going to use the 10mm socket the most. But, since the 10mm socket is so small, if you don't remember where you place it, this is the socket you'll most likely lose, hence all the memes.
10mm Auto | |
---|---|
Bullet diameter | C.I.P.: 10.17 mm (0.400 in) SAAMI: .4005 in (10.17 mm) |
Neck diameter | C.I.P.: 10.74 mm (0.423 in) SAAMI: .423 in (10.7 mm) |
Base diameter | C.I.P.: 10.80 mm (0.425 in) SAAMI: .425 in (10.8 mm) |
Rim diameter | C.I.P.: 10.80 mm (0.425 in) SAAMI: .425 in (10.8 mm) |
If the size is M10 x 25, that would mean that the diameter is 10 mm. Since there is no thread pitch listed, the fastener is assumed to have a coarse thread. The 25 indicated a length of 25 mm. A matching nut would be labeled M10, which also doesn't require a thread pitch since it's a course thread fastener.
What M size is a 10mm bolt?
Size | Clearance Hole mm | Tapping Drill (fine pitch) |
---|---|---|
M6 | 6.5 | 5.25 mm |
M8 | 9 | 7 mm |
M10 | 11 | 9.0 or 8.75 mm |
M12 | 14 | 10.5 mm |
Tap size | Basic major dia (mm) | Basic major dia (inch) |
---|---|---|
M8 x 1 | 8mm | .3150 |
M10 x 1.5 | 10mm | .3937 |
M10 x 1.25 | 10mm | .3937 |
M12 x 1.75 | 12mm | .4724 |

In fact, the 10mm socket is one of the most commonly used metric size sockets of all. It's no secret that the majority of parts under the hood and in the car require a 10mm. The applications may vary from car to car, but the 10mm is absolutely vital to complete a project.
Both are popular choices for self-defense and both have a lot of stopping power. The 10mm is a bit more powerful than the . 45 ACP and it also has a higher capacity.
10mm vs 44 Magnum: Stopping Power
The 44 Mag's 240 grain bullet consistently outpaces the 10mm's 180 grain bullet, even at 100 yards. And because it is so much heavier, it carries significantly more energy at all distances as well.
If you body-shoot an attacking bear front-on, those 10mm bullets must be chosen for extremely deep, straight-line penetration to compromise as many vital organs as possible, and they must shrug off any bone—no matter how massive and dense—encountered along the way.
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Table 3.
Metric | Closest Inch |
---|---|
M8-1.25 | 5/16-18 (Smaller) |
M10-1.5 | 3/8-16 (Smaller) |
M12-1.75 | 1/2-13 (Larger) |
M14-2.0 | 9/16-12 (Larger) |
Nominal Size | Spanner Size |
---|---|
M6 | 10mm |
M7 | 11mm |
M8 | 13mm |
M10 | 17mm |
M8 (8mm) Thread Size (T) 5.4mm Head Length (H) DIN 933 Manufacturing Standard. 10mm Length (L)
M10 nuts have a diameter of 10 mm and are one of the most common sizes of nut available.
Is 3/8 and 10mm the same?
9mm = almost 3/8 inch. 10mm = just over 3/8 inch. 11mm = almost 7/16 inch. 12mm = almost 15/32 inch (= almost 1/2 inch)
Standard wrenches are sold in sixteenth-inch increments up to one and a half inches (and in metric sizes, too, of course). The length of the tool varies in proportion to its size, ranging from about four inches to almost two feet.
These multiple standards meant that some wrench openings might be marked with three size indications. For example, a number 23 wrench would be marked "3/16 U.S.S." for the small opening, and "1/4 U.S.S.", "5/16 Hex Cap", and "5/16 S.A.E." on the larger end. Also, the U.S.S. size was sometimes marked as "NUT".
MECHANIC MATH - Standard wrench sizes made EASY - YouTube
Can you use Metric sockets on SAE fasteners or SAE Sockets on Metric Fasteners? Yes, you can use some sockets on both metric and SAE sizes. However, you need to be careful, as most times they are not exactly the same, and you can strip a bolt by using an SAE socket on a metric bolt and vice versa.
How To Choose A Wrench - Ace Hardware - YouTube
The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces. 4-socket = profile square section. 6-socket, 8-square = regular polygons.
There are four common socket sizes: 1/4 inch (0.6 centimeters), 3/8 inch (0.9 centimeters), 1/2 inch (1.3 centimeters) and 3/4 inch (1.9 centimeters). In-between sizes are available too, starting with 1/4 inch (0.6 centimeters) and increasing every sixteenth of an inch (0.16 centimeters).
It is a turning tool, which you use to loosen, turn and hold bolts and nuts. The wrenches use different measuring systems, as we can see in the imperial vs. metric wrenches discussion.
Look through the table's decimal column and select the first decimal larger than your caliper reading. Select the corresponding fraction. The website Sizes has a table showing Imperial (American) socket sizes. If the fraction is listed, it's the size of your nut and required socket.
What size is 10 mm in inches?
10mm = just over 3/8 inch.
While the majority of bolt-type fasteners used in the United States conform to one or the other measurement scale, the difference between SAE and metric fasteners (and their corresponding sockets) is as profound as the difference between yards and meters: They are almost the same, but not quite.
Metric is simply a better system of units than imperial
In other words, it fits together very well and calculations are easy because it is decimal. This is a big advantage for use in the home, education, industry and science.