Baroness LM331, Service Manual, Page: 19 / 165

Fittings with parallel threads (O-ring seal type)
The tightening torques for fittings with parallel threads (O-ring seal method) are shown in the table
below.
Tightening an adjustable joint forcibly with a spanner or other such tool to secure it to a set position
could damage the adjustable joint, its washers, and other parts. Be sure to tighten an adjustable
joint to the torque appropriate to its size.
Nominal diameter
of thread
Tightening torque
N-m kgf-cm lb-in.
1/4 34.32 - 49.03 350 - 500 309.79 - 442.55
3/8 68.65 - 78.45 700 - 800 619.57 - 708.08
1/2 98.07 - 117.68 1000 - 1200 885.10 - 1,062.12
3/4 147.10 - 176.52 1500 - 1800 1,327.65 - 1,593.18
1 245.17 - 274.59 2500 - 2800 2,212.75 - 2,478.28
1-1/4 294.20 3000 2,655.30
1-1/2 294.20 3000 2,655.30
2 392.27 4000 3,540.40
Maintenance standards and maintenance
LM331
Maintenance standards and maintenance
Page 3-7
Tightening torques