Torque Value
Torque Value
(OP)
I am looking for a torque value for bolting up a 4", 1500# RFWN flange.
The bolts are regular 2H with B7M nuts
The bolts are regular 2H with B7M nuts
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RE: Torque Value
RE: Torque Value
Can anyone assist in quoting the torque value for the 4" 1500# RFWN Flg?
RE: Torque Value
The formula is:
T=F/2*(dn*fn+d2*((f2+cos(alpha)*tan(lambda))/(cos(alpha)-f2*tan(lambda))))
where:
T is the target torque
F is the target bolt tensile load
dn is the mean diameter of the nut
fn is the coefficient of friction between the bolt nut and the flange
d2 is the pitch diameter (or mean thread contact diameter)
f2 is the coefficient of friction between the bolt and nut threads
alpha is the thread flank angle
lambda is the lead angle
Note that for UN and UNR screw threads the flank angel is 30°, the lead angle is equal to atan(L/pi*d2) and L is equal to the pitch of the threads (for 8-thread series this would be 1/8 in)
RE: Torque Value