Allowable Pressure in Threads of Bolted Connections
Allowable pressure in threads of connection bolts.
Nut material | Strength class of bolt material according to the CSN and ISO standards |
4A | 4D | 4S | 5D | 5S | 6S | 6G | 8G, 8E | 10K, 10G | 12K |
3.6 | 4.6 | 4.8 | 5.6 | 5.8 | 6.8 | 6.9 | 8.8 | 10.9 | 12.9 |
pA [MPa] |
steel | 40 | 50 | 75 | 70 | 90 | 110 | 120 | 150 | 200 | 250K |
gray cast iron | 25 | 30 | 45 | 40 | 55 | 70 | 80 | 90 | 125 | 150 |
light alloys | 18 | 20 | 30 | 27 | 35 | 45 | 50 | 60 | 80 | 90 |