Grade 9 Bolts Fastenal

Rev 3 6 09 torque tension relationship for a307a grade 5 8 9 bolts in sq.

Grade 9 bolts fastenal. Use them for heavy duty stamping applications as well as earth moving machinery such as bulldozers and excavators. Easy online ordering for the ones who get it done along with 24 7 customer service free technical support more. Searching for grade 9 cap screws hex bolts. 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. For bolts and screws longer than 6 in. Extreme caution should be used when using a formula for torque tension relationships. Grade 9 steel hex head screws are marked with nine radial lines.

Property class often just class specifies metric fasteners. 9 at the top of the scale this grade offers the most strength in a joint. Replace a graded fastener with same or higher grade don t replace a grade 8 fastener with a grade 5 or 2. Torque is only an indirect indication of tension.

Special markings on screw heads and nuts identify the fastener s grade. Under over tightening of fasteners can result in costly equipment failure or personal injury. Grade 2 requirements for sizes 1 4 through 3 4 in apply only to bolts and screws 6 in. 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.

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. Grade 1 requirements shall apply. 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.

Cap screws and hex bolts have heads designed for tightening to exact specifications with ratchets or spanner torque wrenches. They fit with corresponding tapped holes and nuts to create bolted joints. Bolts secure material by applying pressure from the head of the bolt. Grainger s got your back.

The ductility of a bolt decreases as the hardness and strength increases. However as highlighted below there are a few issues that must be considered when using higher strength bolting products.