The ductility of a bolt decreases as the hardness and strength increases.
Grade 9 bolts fastenal.
9 at the top of the scale this grade offers the most strength in a joint.
Inch fasteners those commonly used in north america will have a grade or astm rating.
However as highlighted below there are a few issues that must be considered when using higher strength bolting products.
Bolts secure material by applying pressure from the head of the bolt.
They fit with corresponding tapped holes and nuts to create bolted joints.
Our strongest screws these grade 9 steel screws have a tensile strength of 180 000 psi about 20 stronger than our high strength steel screws.
Grade 1 requirements shall apply.
Cap screws and hex bolts have heads designed for tightening to exact specifications with ratchets or spanner torque wrenches.
Replace a graded fastener with same or higher grade don t replace a grade 8 fastener with a grade 5 or 2.
Grade 9 steel hex head screws are marked with nine radial lines.
Special markings on screw heads and nuts identify the fastener s grade.
In threads per inch 307a astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs tightening torque clamp load lbs tightening torque clamp load lbs tightening torque clamp load lbs tightening.
In lbs lbs lbs lbs.
Searching for grade 9 cap screws hex bolts.
And shorter in lengths.
Grade 8 is near the high end of the grade scale although there are higher grades and strengths for more specialized fasteners.
Extreme caution should be used when using a formula for torque tension relationships.
Easy online ordering for the ones who get it done along with 24 7 customer service free technical support more.
Torque is only an indirect indication of tension.
Rev 3 6 09 torque tension relationship for a307a grade 5 8 9 bolts in sq.
Grainger s got your back.
Bolts with rounded heads such as carriage.
Compared to a grade 5 bolt a grade 8 socket head cap screw or grade 9 bolt would increase the bolt strength roughly 25 50.
Grade 2 requirements for sizes 1 4 through 3 4 in apply only to bolts and screws 6 in.
For bolts and screws longer than 6 in.
Use them for heavy duty stamping applications as well as earth moving machinery such as bulldozers and excavators.
