3 8 Grade 8 Bolt Torque Fine Thread

Torque values calculated from formula t kdf.

3 8 grade 8 bolt torque fine thread.

The factor that makes a grade 8 bolt different from a lower grade bolt is its preload strength. A standard six sided nut. 5 8 8 8 10 9 class 5 8 class 8 8 class bolt head identification bolt size grade 2 grade 5 grade 8 metric bolt head identification. A low carbon steel for general use.

These figures represent an estimate of torque torque being the measurement of friction not tension required to induce given preload clamp load in a bolt. The preload or thread tension in a fastener is higher when the type of steel being used is grade 8 in quality. Fine thread figures are for 1 14. Supply part number.

Fnl grade 9 clamp tightening torque load tightening torque sae j429 grade 8 k 0 15 4169 k 0 15 k 0 17 k 0 20 unified coarse thread series fine thread series 3544 k 0 15 383 91 325 78 287 68 327 157 k 0 17 281 492 784 201 1195 2358 3127 1016 2004 239 418 666 171 588 896 1768 211 151 3024 120 240 420 669 1020 2012 3557 568 867 1710. Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2. 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. Grade 8 is stronger than grade 5 and is commonly found in high strength automotive applications.

Grade 2 5 and 8 values are for slightly lubricated bolts. Recommended bolt torque table size recommended torque grade 2 grade 5 grade 8 18 8 s s bronze brass coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8 4 3 6. Unless otherwise specified use torque values listed above. In millimeters x thread pitch torque tolerance 0 15 of torquing values.

1 1 2 12 1330 980 2970 2190 4820 3560 4mm x pitch nominal thread dia. Grade 2 grade 5 grade 8 18 8 s s bronze brass. Us recommended bolt torque. A style of prevailing torque lock nut that can be installed either side up.

Often used in high temperature applications. Tightening torque guide for grade 5 8 hex cap screws this table is based on ifi 5th edition technical data n 12 n 16 using equation 1 and a torque coefficient k 0 20 for non plated steel fasteners and k 0 15 for plated fasteners. All other torque values are in foot pounds. Torque values for and 5 16 inch series are in inch pounds.

Clamp load estimated as 75 of proof load for specified bolts. Torque tension reference guide printed in u s a. 5 16 8 9 13 14 18 20 11 11 8 10 3 10 9 8 9 9 7 3 8 15 17 23 26 33 37 20 22 18 20 16 18 7 16 24 27 37 41 52 58 31 33 29 31 26. Higher grade materials such as carbon alloy steel allow for greater torque strength in the threads of the bolt.

Grade 2 calculations only cover fasteners. All calculations are for coarse thread series unc. Torque has been converted into ft lbs by dividing the result of the formula by 12. Print this page.

D is the nominal diameter f is the clamp load k 0 15 for lubricated conditions k 0 18 for zinc plated and dry conditions.