What are the torque values for structural steel bolts?
Maximum Recommended Tightening Torques Metric Course Pitch Grade 12.9 Plated Grade 12.9 Plated Grade 10.9 Plated Grade 10.9 Plated (M39) 4471 3298 (M39) 3726 M42 5525 4075 M42 4604 (M45) 6871 5068 (M45) 5726 M48 8287 6113 M48 6906
What are the torques for a 12.9 zinc plated bolt?
Below is a list of the recommended tightening torques for 12.9 / 10.9 / 8.8 zinc plated finish bolts.
Is there a way to check the torque of a bolt?
Bolt torque can be checked with a tool such as a torque wrench, but without a value as a guideline, a torque wrench offers no advantage. To arrive at the correct torque value, several other values must be found first. Two principles influence the correct clamping pressure for each bolt, known as clamp load.
What’s the correct torque for an imperial bolt?
Thankfully, standards organizations have assembled the standard tensile strengths for common bolts into easy-to-use standards. 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.
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.
Thankfully, standards organizations have assembled the standard tensile strengths for common bolts into easy-to-use standards. 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.
What kind of torque test do you need for short bolts?
Max. Max. Note: Breaking torque test applies to bolts and screws with thread less than M3 for which no breaking and proof loads are indicated in ISO 898-1, as well as to short bolts and screws with nominal diameters 3 mm to 10 mm which cannot be subjected to a tensile test.