Komatsu PC500LC-10R, Shop Manual, Page: 69 / 758

Table of tightening torque for face seal joints
REMARK
• The tightening torque table below applies to the seal joint (sleeve nut type) made with steel pipe for plated
low pressure piping which is used for engine.
• The table is applied to the threaded portion coated with engine oil (wet threaded portion).
• Reference: The face seal joint of the dimension in ( ) is also used depending on the specification.
Outside di-
ameter of
adequate
pipe ( mm)
Width
across flats
( mm)
Tightening torque ( Nm { kgm} ) Face seal
Range Target
Nominal size -
threads per inch
Thread root diam-
eter( mm) (refer-
ence)
8 19 14 to 16 {1.4 to 1.6} 15 {1.5}
9
/
16
-18UN 14.3
10 22 24 to 27 {2.4 to 2.7} 25.5 {2.6}
11
/
16
-16UN 17.5
12 24 (27) 43 to 47 {4.4 to 4.8} 45 {4.6}
13
/
16
-16UN 20.6
15 (16) 30 (32) 60 to 68 {6.1 to 6.8} 64 {6.5} 1 -14UNS 25.4
22 (20) 36 90 to 95 {9.2 to 9.7} 92.5 {9.4} 1
3
/
16
-12UN 30.2
Tightening torque table for bolts and nuts on 102, 107 and 114 series engines
REMARK
Tighten the metric threads bolts and nuts used on the 102, 107 and 114 series engines to the torques shown in
the following table unless otherwise specified.
Thread diameter ( mm) Tightening torque ( Nm { kgm} )
6 10±2 {1.02±0.20}
8 24±4 {2.45±0.41}
10 43±6 {4.38±0.61}
12 77±12 {7.85±1.22}
14 -
Tightening torque table for 102, 107, and 114 series engines (joint bolts)
REMARK
Tighten the metric joint bolts used on the 102, 107, and 114 series engines to the torque shown in the following
table unless otherwise specified.
00 INDEX AND FOREWORD STANDARD TIGHTENING TORQUE TABLE
PC500LC-10R 00-67