Diameter, Thread count/pitch, and Length should always be specified in this order.
What are bolt categories?
The principal types of bolts commonly used include:
- Anchor Bolts.
- Blind Bolts.
- Carriage Bolts.
- Double End Bolts.
- Eye Bolts.
- Flange Bolts.
- Hex Bolts.
- Machine Bolts and Machine Screws.
What are the three grades of bolts?
There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt.
How do you size a bolt?
To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.
What are the different size bolts?
Common threads per inch sizes are: 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28, 32, 36, 40, 48, 56, 72, 80. Most fasteners fall into coarse and fine categories, but there is also extra fine and other designations.
How are bolts classified on what basis & Types?
Bolts used in steel structures are of three types: 1) Black Bolts 2) Turned and Fitted Bolts and 3) High Strength Friction Grip (HSFG) Bolts. Bolt is a metal pin with a head at one end and a shank threaded at other end to receive a nut, as shown in Figure 6.
How many types of bolt heads are there?
The most common type of bolt head types includes square, hex, slotted hex washer, and socket cap. The earliest bolt heads in use were the square heads. Square heads consist of a square indentation on the head followed by a shaft that withstands rotation when a torque is applied to it.
How do you identify bolt grades?
You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt.
What is the meaning of 4.6 grade bolt?
In 4.6, The first number 4 indicates 1/100 of nominal tensile strength . Hence the tensile strength = 400 Mpa. The second number indicates 10 times the ratio between lower stress(proof stress) and nominal tensile strength(yield stress ratio) means, 10 times the yield stress = 10 x 240/400 = 2400/400 = 6.
What does 8.8 mean on a bolt?
In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.
What is an M6 bolt?
M6 refers to a metric 6 mm screw. The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 0.1 mm. The number 0.1 mm refers to 0.1 threads per millimeter. You can identify an M6 screw by measuring the diameter at slightly more than 7/32″ (0.228″).
What are standard bolt sizes?
US Standard Thread Length for Bolts
| Bolt Diameter | Standard Thread Length (in.) * | |
|---|---|---|
| Bolts 6 inches and shorter | Bolts longer than 6 inches | |
| 1/4″ | 3/4″ | 1″ |
| 5/16″ | 7/8″ | 1-1/8″ |
| 3/8″ | 1″ | 1-1/4″ |
What is a 3/8 screw?
A 3/8″-16 screw is a machine screw, the “3/8” is the diameter and the “16” is the number of threads per inch. This screw will thread into a nut or threaded hole. Wood screws are tapered and thread count is not part of the description.
What are the sizes of metric bolts?
Metric clearance and tapping drill hole sizes.
| Size | Clearance Hole mm | Tapping Drill (std Pitch) |
|---|---|---|
| M10 | 11 | 8.5 mm |
| M12 | 14 | 10.25 mm |
| M16 | 18 | 14 mm |
| M20 | 22 | 17.5 mm |
What do bolt sizes mean?
The size of a metric bolt is specified using pitch, diameter, and length in millimeters. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length.
How are bolts specified?
A bolt’s size is classified based on a number of dimensions, namely the bolt’s diameter, length of shank, thread pitch, grade, thread length and head size. Bolts can me specified in metric using millimeters, but the standard, internationally-recognized descriptions of bolt sizes are in inches.
What are the three features of an English or standard bolt that are used to identify it’s size?
It can get really confusing sometimes when it comes to fasteners since there are just so many. But this handy guide should help you learn the “nuts and bolts” of well…. nuts and bolts. The first three major things to consider are: Length, Diameter, and Pitch.
How are bolts specified and identified?
Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only). This page describes what these attributes represent. Information on how they are written can be found on our How Fastener Measurements Are Notated page.
Why are there different types of bolt heads?
Answer: The primary reason for the wide variety of screw head drive types is to ensure the fact that you will never have the proper screwdriver close at hand when you need it.
How many types of threads are there?
Six Most Common Types of Threads
NPT/NPTF. BSPP (BSP, parallel) BSPT (BSP, tapered) metric parallel.
What are the parts of a bolt called?
The bolt consists of a head and a cylindrical body with screw threads along a portion of its length. The nut is the female member of the pair, having internal threads to match those of the bolt. Washers are often used to prevent loosening and crushing. See also nut; washer.
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