Additional information – SPP Pumps Auto Prime - High Flow Range XF300 & 400 User Manual
Page 21
Operators Instructions for
XF300 & XF400 Range Centrifugal Pumps
Manual No/Rev
W77-009E / 2
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 21 of 23
9. ADDITIONAL INFORMATION
9.1 Standard Metric Nut and Bolt Torque Recommendations
This information is for reference only. The user must check that the torque figures listed here are
applicable to the fasteners used. Nuts and bolts should be neither under nor over tightened.
Grade of
Approximate Torque (Nm) for Bolt Diameters:
Bolt
M5
M6
M8
M10
M12
M16
M20
M24
M30
M36
4.6
2.7
4.5
11
22
38
95
185
320
633
1110
8.8
6.9
11.7
28
56
98
244
476
822
1634
2855
10.9
9.4
15.9
38
77
134
332
646
1120
2223
3885
12.9
11.2
19.1
46.4
92
160
397
775
1342
2666
4660
Note: These torque figures are approximate, and for unplated fasteners only. No allowance has been
made for special finishes or lubricants, washers or mating surfaces.
Bolt and Nut Grade Combinations
Grade of BOLT
4.6
8.8
10.9
12.9
Note: It is permissible to fit higher
Grade of NUT
4
8
12
12
grade nuts than recommended.
Grade Identification
BOLTS & NUTS - Grade 4.6
BS4190 (ISO272, 885, 888 & 4759/1). Grade marking is optional. Normally there will be no
mark other than the 'M' thus:
BOLTS - Grade 8.8
BS 3692 (ISO272, 4759/1). Grade
marking is mandatory, may also
have trade marks.
NUTS - Grade 8
Indented marks as a clock face, dot at
12.00, bar at 8.00, indicates grade 8
nut.
High Strength Friction Grip Bolts & Nuts
BOLT
NUT
BOLT
Grade
10.9
NUT
Grade
12