How can you tell the grade of a bolt?
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.
Where do you find the strength class number on a English bolt?
Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face. The below diagram shows examples of English and Metric bolt and nut markings. 1. Grade 2 English Bolt 2. Grade 5 English Bolt 3. Grade 7 English Bolt 4.
How many radial lines are on a Grade 5 bolt?
So, for example, a grade 5 bolt will only have 3 radial lines on its head. A grade 8 bolt will have 6 radial lines on its head. Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face.
What do the radial lines on a bolt head mean?
English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head.
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.
Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face. The below diagram shows examples of English and Metric bolt and nut markings. 1. Grade 2 English Bolt 2. Grade 5 English Bolt 3. Grade 7 English Bolt 4.
What kind of fasteners are used for nuts and bolts?
These washers are round outer diameter thin plates with a center hole punched to the size of the bolt or screw. Flat washers are used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened. Buy Now – Extra Thick Flat Washers.
Which is better a jamb or a hook bolt?
Jamb tongue-bolts are generally not quite as strong as hook bolts. Tongue bolts require less door prep/milling than hook bolts. With patio doors in particular, there is a trend toward narrower styles (which decrease door stiffness) and this is translates into a greater need for beefier multipoint door-locking hardware.