MDE-4334C Atlas Start-up and Service Manual · April 2008
Page 7-9
General Service Procedures
Hydraulic/Mechanical Components
Torque Specifications
Ensure that you follow these recommendations when working with fasteners on pumps and
dispensers:
• Never use a metric fastener in place of an SAE (or non-metric) fastener and never use an
SAE fastener in place of a metric fastener. The device may suffer damage.
• To prevent failure, always use the same or higher grade of materials for load bearing
devices. For example, structural and hydraulic device bolts.
The following tables provide general torque guidelines for plated steel screws and bolts, pipe
plugs, and tube fittings.
Screws and Bolts (Plated)
Recommended Torque
Thread
in-lbs
Newton Meters (Nm)
M4
10-12
1.1-1.3
M5
25-35
2.8-4.0
M6
36-40
4.1-4.5
M8
120-140
13.6-15.8
M10
150-170
16.9-19.2
Pipe and Tube Fittings
Recommended Torque
Thread
in-lbs
Nm
1/8 inch NPT
10-12
13.6-16.3
1/4 inch NPT
22-25
29.8-33.9
3/8 inch NPT
30-35
40.7-47.5
1/2 inch NPT
35-40
47.5-54.2
3/4 inch NPT
45-55
61.0-74.5
1 inch NPT
70-80
94.9-108.4
1-1/2 inch NPT
150-180
203-244