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ENGINEERING STANDARD PROCEDURE
IMPELLER INSTALLATION – TECH BULLETIN
1of 1
DOCUMENT NBR. :
PED-017
REVISION:
0
EFFECTIVE
DATE:
09-16-2003
0 NEW UJB 08-15-02
1 ADDED250LH UJB 09-26-03
REV ECN CHANGE DESCRIPTION BY APPV’D DATE
1.0 SCOPE:
Assembly Pre-Load / Bolt Torque requirements for Metric Fasteners of Grades A2-70 (304L)
A4-70 (316L) and 8.8, for Sizes M4 to M20.
2.0 METHOD:
ASSEMBLY TORQUE / ASSEMBLY PRE-LOAD
TIGHTENING TORQUE ASSEMBLY PRE-LOAD
SIZE CLASS
Nm lb/ft [lb/in] kN lbf
M4 2.20 1.622 [19.46] 2.73 612.23
M5 4.20 3.097 [37.16] 4.47 1002.44
M6 7.40 5.45 [65.40] 6.31 1415.08
M8 17.80 13.12 11.60 2601.42
M10 36.00 26.54 18.40 4126.40
M12 62.00 45.72 26.90 6032.62
M16 150.00 110.62 50.90 11414.88
M20
A2-70, A4-70, 8.8
303.00 223.45 82.00 18389.40
ABOVE TORQUE / PRE-LOAD VALUES ARE BASED ON A COEFFICIENT OF FRICTION OF 0.14 (Anti-seize Lubricant)