How do you determine torque value?
How do you determine torque value?
Mark the tightened fastener and surrounding application. In the tightening direction, begin to slowly apply force to the tool until the first movement in the fastener is noted. The reading recorded is a good indication of the original torque applied to the joint. This is the best way to determine residual torque.
How do I know if my head bolts are torque to yield?
If an engine produces 1,500 pounds of pressure and the cylinder head has 8 bolts, then each bolt must be tightened to 187 foot-pounds of torque to secure the cylinder head to the block. Likewise, how do you know if a bolt is torque to yield?
How can you tell the torque of a fastener?
After tightening the bolt, mark the bolt surface and that of the product or workpiece. Then loosen the bolt. Re-tighten it until the markings re-align. The torque needed to return the bolt to its original position is the torque value of the bolt.
What is the correct torque for a SAE J429 bolt?
SAE J429 governs imperial sizes, while ISO 898 governs metric-size bolts. 1/4 to 3/4in. >3/4 to 1 1/2in. For imperial bolts, grades 5 and 8 are most common. SAE J429 conforming bolts will have radial markings machined on the head of the bolt that indicate bolt grade.
When is torque needed to return a bolt to its original position?
The torque needed to return the bolt to its original position is the torque value of the bolt. The torque values should be determined immediately after bolts are tightened and before the product is painted or heated.
If an engine produces 1,500 pounds of pressure and the cylinder head has 8 bolts, then each bolt must be tightened to 187 foot-pounds of torque to secure the cylinder head to the block. Likewise, how do you know if a bolt is torque to yield?
After tightening the bolt, mark the bolt surface and that of the product or workpiece. Then loosen the bolt. Re-tighten it until the markings re-align. The torque needed to return the bolt to its original position is the torque value of the bolt.
SAE J429 governs imperial sizes, while ISO 898 governs metric-size bolts. 1/4 to 3/4in. >3/4 to 1 1/2in. For imperial bolts, grades 5 and 8 are most common. SAE J429 conforming bolts will have radial markings machined on the head of the bolt that indicate bolt grade.
How to measure torque when ratcheting a bolt?
This is commonly used to ensure bolts are torqued during assembly. If you don’t have access to a torque angle gauge (as rpmerf recommends) or space is tight, here is one possible way estimate the angle with a ratchet: Without any socket on the ratchet, rotate the square drive head 180° by hand while counting the number of clicks felt.
