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What does number 8 mean on a bolt head?
It's a measure of the strength of the bolt. The strength is measured using what's called a grade. In this case, you have a grade 8 bolt. The higher the number, the stronger the bolt.
What is number on the head of a bolt mean?
bolt strength markings. Numbers represent metric threads and slashes represent standard threads (the greater the number/slashes, the greater the strength of the bolt.
What happens if you torque head bolts more then supposed to?
You can over-torque a bolt and you may not know it. But you can damage the bolt in several ways that may be visible. 1. The threads will be stripped or sheared away. 2. The bolt will be permanently stretched so it is longer than it originally was. 3. The head of the bolt may be twisted or the corners of the bolt head rounded off. High strength bolts are marked on the head with symbols that indicate the strength of the bolt. You should know what type bolt you are using and its application. Just because it is made of Steel, that does not mean it will have sufficient strength for some applications.
How is the grade strength of a bolt determined?
If there are lines coming inward from the outside on the head then this is an SAE bolt, not metric. If there are three of these lines than it is a grade five bolt.
What is the meaning of bolt head 8.8?
It has to do with the torque/strength of a bolt. See the Related Link below for a full explanation and table of various properties.
What is the designation for a grade 5 bolt?
A grade 5 hex bolt has 3 radial lines formed into the top of the head. Bolt manufacturers can provide listings of bolt markings and their corresponding strength ratings.
What are the head bolt torque specs for a 2002 Mitsubishi lancer?
10 bolts
The tinsel strength like a grade 8 exhaust manifold bolt is grade 8 which has 5tics on the head what about metric?
It's TENSILE strength and on metric bolts it is indicated by a number.
Can a 12 point socket be used on a hex head bolt?
Yes, but you run the risk of stripping the head. For high strength, torque, always use a 6-point socket.
How is tensile strength of a metric bolt identified?
Many High Tensile bolts will have a number of raised strokes formed in the head of the bolt. Three or five are common and usually form a reverse triangle or reverse heptagon
What type of fastener is a bolt with no head commonly referred to as?
A bolt with no head is commonly referred to as a screw.
What is the head bolt torque sequence for a 2001 Daewoo Leganza?
25nm then 3 lots of 90 degrees,10 head bolts,starting in the middle tighten in turn, middle bolt on exhaust side,bolt opposite on intake side,bolt on immediate right intake side bolt opposite on ex side,then Bolton immediate left of the first bolt tightened then bolt opposite on intake side,and so on so as you work outwards in a crcular motion,tighten all 10 to 25nm first and then 90 degrees in turn 3 times.
