What does the marking 10 9 on the top of a bolt indicate?

What does 10.9 on a bolt head mean?

The grade 8.8 refers to the tensile strength which is generally 116,000 psi, grade 10.9 is generally 150,000 and grade 12.9 is generally 175,000 psi.

What does the number on top of a bolt mean?

Bolt Grade Markings

Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt. For most home and automotive applications, you won’t need anything more than a grade 8 bolt strength or metric class 10.9.

What does the number 10 mean on a bolt?

10-32 Threads

The number “10” is used as a size designator and has no numerical meaning. “32” refers to the 32-thread pitch in threads per inch. You can identify a 10-32 screw by measuring the diameter with a ruler at exactly 3/16 inches (). 12-24 Threads.

What are the markings on top of bolts?

The markings on the heads of bolts serve two different purposes: The markings can indicate who manufactured the bolt. This will vary from manufacturer to manufacturer, but is usually one, two or three characters. The markings can identify the standard to which the bolt was made.

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What does Ty 8.8 on a bolt mean?

So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.

What does 10.9 hardness of nut & bolt mean?

Grade 10.9 metric bolts are manufactured using medium carbon steel, medium carbon steel alloy and low carbon boron steel that has been quenched and tempered. Used in automotive applications and for bolting large and forged parts, metric 10.9 bolts exhibit high tensile strength and good wear resistance.

What does 9.8 mean on a bolt?

A metric bolt designated as ISO class 6.8 roughly corresponds in strength to an SAE Grade 2 bolt. Bolts of ISO class 8.8 and the slightly stronger class 9.8 roughly correspond to an SAE Grade 5 bolt. An ISO Class 10.9 bolt roughly corresponds to an SAE Grade 8 bolt.

What does 9.8 stamped on the head of a bolt mean?

9.8. 9% stronger than. SAE J429, grade 5. ASTM A 449.

What is a Grade 9 bolt?

Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.

What size screw is a #10?

American Screw Sizes

Size Nearest Fraction Millimeter
#6 9/64 3.3
#8 5/32 4.2
#10 3/16 4.8

Are 10 32 and M5 the same?

10-32 and M5 are almost identical. If you’re not putting much weight on the rails, you can force one into the other. It will result in minor damage to both the bolt and nut, but it works.

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Is a 10.9 bolt stronger than Grade 8?

Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. A low carbon steel for general use.