What do the numbers on top of bolts mean?
The number has nothing to do with the size, but does indicate the relative strength of the bolt. The higher the number, the stronger the bolt. The lines on the head of a bolt indicate its grade.
How do I know what size my bolt is?
How to Measure the Size of a Bolt
- Step 1: Measure the shank’s diameter. The shaft of the bolt is called the shank, and its diameter is the first dimension used to describe a bolt size.
- Step 2: Determine the thread pitch.
- Step 3: Measure the length of the shank.
- Step 6: Measure the length of the threaded portion of the bolt.
Is a 12.9 Bolt stronger than Grade 8?
Many fasteners (screws, etc.), especially smaller sizes, are typically not graded—their strength isn’t specified….Table 1.
| Grade/Class | Strength |
|---|---|
| Metric Class 8.8 | Similar to Grade 5. |
| Metric Class 10.9 | Similar to Grade 8. |
| Metric Class 12.9 | The highest metric class for strength, it exceeds Grade 8. |
What are the dimensions of a standard bolt?
Once a standard bolt has a diameter of less than a 1/4, they go to whole numbers counting down from 12 to 0 (you can see this here Standard USA Bolt Dimensions ). A great tool to measure bolts is a caliper, they take very precise measurments.
How to find the size of a hole in a fastener?
The minimum hole diameters are given. Per ASME B18.2.1, the nominal thread length of inch-series bolts can be found by: where L is the total bolt length and dnom is the nominal bolt diameter.
What do the numbers mean on a hex head bolt?
In the case of hex head bolts, most of them come with markings. Metric bolts have numbers, standard bolts have little lines, and rusty bolts… good luck.Tensile strength is is the maximum amount of stress a bolt can endure from being stretched or pulled until it fails. Again this is only important when it comes to the application.
How can you tell the length of a car bolt?
Measure the bolt length (not including the cap), and see if it’s closer to a fraction of an inch, or a nice and round millimeter length that ends in 5 or 0. Sometimes bolts can be a very specific length and this way might not always work, but you should at least know the length by now.
What is the most common bolt size?
Common Bolt Sizes. The most common sizes for wheel lug nuts are 7/16-inch, 1/2-inch, 9/16-inch, 5/8-inch, 12 mm, and 14 mm. In addition to these sizes, automotive engines may also have 1/4-inch, 5/16-inch, and 3/8-inch bolts.
What size is a 10 bolt?
The 10-bolt, 8.2-inch differentials use .375-inch right-hand thread bolts in the ring gear. The 8.5-inch pinion diameter is 1.625 inches, whereas the 8.2-inch is smaller at 1.435 inches.
What size is a metric bolt?
Metric bolt sizes range from 10 mm to 24 mm. Odd diameters such as 19 mm and 21 mm become common in this range. Standard bolt sizes range from 5/16-inches to 1 inch, again increasing in increments of 1/16-inch.
What are the dimensions of an U – bolt?
These are essentially a single piece of mild or stainless steel bar that is threaded at the end of either side and then shaped as the letter U. U Bolt Dimensions range from M6 to M20 in terms of thread diameter, with various lengths and specials also available.