Service Manual

Greensmaster Flex 18/21 Page 2 – 5 Product Records and Maintenance
Standard Torque for Dry, Zinc Plated and Steel Fasteners (Metric Fasteners)
Thread Size
Class 8.8 Bolts, Screws and Studs with
Regular Height Nuts
Class 10.9 Bolts, Screws and Studs with
Regular Height Nuts
Thread Size Regular Height Nuts
(Class 8 or Stronger Nuts)
Regular Height Nuts
(Class 10 or Stronger Nuts)
M5 X 0.8 57 + 6 in–lb 644 + 68 N–cm 78 + 8 in–lb 881 + 90 N–cm
M6 X 1.0 96 + 10 in–lb 1085 + 113 N–cm 133 + 14 in–lb 1503 + 158 N–cm
M8 X 1.25 19 + 2 ft–lb 26 + 3 N–m 28 + 3 ft–lb 38 + 4 N–m
M10 X 1.5 38 + 4 ft–lb 52 + 5 N–m 54 + 6 ft–lb 73 + 8 N–m
M12 X 1.75 66 + 7 ft–lb 90 + 10 N–m 93 + 10 ft–lb 126 + 14 N–m
M16 X 2.0 166 + 17 ft–lb 225 + 23 N–m 229 + 23 ft–lb 310 + 31 N–m
M20 X 2.5 325 + 33 ft–lb 440 + 45 N–m 450 + 46 ft–lb 610 + 62 N–m
NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
NOTE: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
engine oil or thread sealant such as Loctite.
NOTE: The nominal torque values listed above are
based on 75% of the minimum proof load specified in
SAE J1199. The tolerance is approximately +
10% of the
nominal torque value.
Product Records
and Maintenance