Gasboy Atlas Start-up - Manual (Page 128)

Page 6-8 MDE-4334D Atlas™ Start-up and Service Manual · July 2013
Hydraulic/Mechanical Components General Service Procedures
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.
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 National Pipe Thread (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
Flanged and Compression Tube Fittings
Recommended Torque
Pipe in-lbs ft-lbs
1/8-inch 40 - 45
1/16-inch 49 - 55
1/4-inch 58 - 65
5/16-inch 72 - 80
3/8-inch 9 - 10
1/2-inch 19 - 21
5/8-inch 26 - 29
3/4-inch 38 - 42
7/8-inch 49 - 54