SPP Pumps Unistream User Manual
Page 23
Operators Instructions for
Unistream Centrifugal Pumps
Manual No/Rev
W21-002E / 10
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 23 of 24
10. 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
Bolt
Approximate Torque (Nm) for Bolt Diameters:
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
46
8.8
10.9
12.9
Note: It is permissible to fit higher
grade nuts than recommended.
Grade of NUT
4
8
12
12
10.1 Grade Identification
M
10
.9
Nut & Bolt Grade Identification
High Srength Friction Grip Bolts & Nuts
Bolts & Nuts - Grade 4.6
BS4190 (ISO272, 885, 888 & 4759/1) - Grade marking is optional.
Normally there will no other mark other than the ’M’ thus
Bolts - Grade 8.8
B 3692 (ISO272 & 4759/1) -
Grade marking is mandatory,
also may have trade marks.
S
Nuts - Grade 8
Indented marks as clock face,
dot at 12.00, bar at 8.00
indicates grade of nut.
Bolt
Nut
Bolt
Grade
10.9
Nut
Grade
12
M
M
M
M
12
M
8.
8
Maintenance Record
Date
Summary of maintenance & repairs done - replacement parts fitted etc:
Installed & Commissioned
First Oil Change (after 200 hours running)