Yanmar EF-494T - SCREW TIGHTENING TORQUE TABLE

0 INTRODUCTION 0 INTRODUCTION
EF494T TM 06/2011 edition
16
0.3.3 SCREW TIGHTENING TORQUE TABLE
Tighten screws, bolts and nuts according to the table below. If the tightening torque is specified, follow
the specification.
General tightening torque Unit: N-m (kgf-m)
Items
Thread diameter
Tightening torque
PT plug
1/8
9.8 (1.0)
1/4
19.6 (2.0)
3/8
29.4 (3.0)
1/2
58.8 (6.0)
Pipe joint bolt
M8
13.0 - 16.4 (1.3 - 1.7)
M12
24.5 - 34.3 (2.5 - 3.5)
M14
39.2 - 49.0 (4.0 - 5.0)
M16
49.0 - 58.8 (5.0 - 6.0)
General tightening torque of bolts N-m (kgf-m)
Standard thread screw
Nominal size
4T
7T
M6
4.90 - 6.86 (0.5 - 0.7)
8 - 12 (0.8 - 1.2)
M8
12.74 - 16.66 (1.3 - 1.7)
23 - 29 (2.3 - 3.0)
M10
24.50 - 34.36 (2.5 - 3.5)
44 - 59 (4.5 - 6.0)
M12
44.10 - 58.80 (4.5 - 6.0)
78 - 98 (8.0 - 10.0)
M14
68.80 - 83.30 (7.0 - 8.5)
118 - 147 (12.0 - 15.0)
M16
107.80 - 137.20 (11.0 - 14.0)
167 - 206 (17.0 - 21.0)
M18
156.80 - 186.20 (16.0 - 19.0)
235 - 284 (24.0 - 29.0)
M20
215.60 - 264.60 (22.0 - 27.0)
324 - 402 (33.0 - 41.0)
IMPORTANT
 The tightening torque of fine thread screws shall be 80% of that of the standard thread
screws.
 To tighten any aluminum part, apply torque equivalent to 80% of the specified value.
 Recently, all the bolts may be standardized to 7T bolts under the plant line management of
Yanmar.
 When 7T bolt is used with rubber, rubber packing or aluminum parts, tighten the bolt
following the values in the 4T-bolt table.
Bolt standard
4T
7T
Tensile Strength (kgf/sq.mm)
Minimum
40
70
Brinell Hardness (Hb)
Minimum
105
201
Maximum
229
277
Yield Point (kgf/sq.mm)
Minimum
23
50