Grade 9 Bolts Fastenal

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 9 bolts fastenal.

And shorter in lengths. However as highlighted below there are a few issues that must be considered when using higher strength bolting products. Under over tightening of fasteners can result in costly equipment failure or personal injury. Use them for heavy duty stamping applications as well as earth moving machinery such as bulldozers and excavators.

Special markings on screw heads and nuts identify the fastener s grade. Grade 2 requirements for sizes 1 4 through 3 4 in apply only to bolts and screws 6 in. Bolts secure material by applying pressure from the head of the bolt. Rev 3 6 09 torque tension relationship for a307a grade 5 8 9 bolts in sq.

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. Replace a graded fastener with same or higher grade don t replace a grade 8 fastener with a grade 5 or 2. The zinc yellow chromate plating resists corrosion in wet environments. Grade 8 is near the high end of the grade scale although there are higher grades and strengths for more specialized fasteners.

Grade 9 steel hex head screws are marked with nine radial lines. In lbs lbs lbs lbs. Bolts with rounded heads such as carriage. They fit with corresponding tapped holes and nuts to create bolted joints.

For bolts and screws longer than 6 in. 9 at the top of the scale this grade offers the most strength in a joint. 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. Inch fasteners those commonly used in north america will have a grade or astm rating.

The ductility of a bolt decreases as the hardness and strength increases. Easy online ordering for the ones who get it done along with 24 7 customer service free technical support more. Grainger s got your back. Property class often just class specifies metric fasteners.

Cap screws and hex bolts have heads designed for tightening to exact specifications with ratchets or spanner torque wrenches. Torque is only an indirect indication of tension.