[alfa] Torque specification chart for metric bolts

["Jim & Michelle Trofitter" <alfajim@xxxxxxxxx>]

General Torque Specification Chart for Metric Fasteners (in Newton Meters)

      Bolt Diameter Material Class (Hardness)

      MM Inch 4.6 4.8 5.8 8.8 9.8 10.9 12.9
      5 .197 3 4 5 7 8 11 12
      6 .236 5 6 8 12.5 14 17 20
      6.3 .248 5.5 8 9.5 14 16 21 24
      8 .315 12 16 20 30 34 44 50
      10 .394 23 32 40 60 70 85 100
      12 .472 40 56 70 103 120 150 180
      14 .551 65 90 110 167 190 240 280
      16 .630 100 140 170 270 290 380 440
      18 .709 137 177 225 350 - 480 580
      20 .787 200 - 330 520 - 740 860

Calculate torque in inch pounds: .7376 * NM = Foot lbs

      These torque values are approximate and should not be accepted as
accurate limits. Indeterminate factors (surface finish, type of plating and
lubrication) in specific applications preclude the publication of accurate
values for universal use. Manufactures of various types of equipment usually
provide specific tightening instructions which should be followed. DO NOT USE
the above values for gasket joints or joints of soft materials. DO NOT USE
your torque wrench for values greater than its maximum scale reading.
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