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MAXIMUM SLD INSTALLATION TORQUES


Because spring-loaded devices are not bolts or screws, the maximum installation torques they can withstand are significantly less than bolts or screws. Use the table and additional information provided below as a guide for installing Vlier Spring-Loaded Devices. If you need more specific information, please contact Vlier Engineering.
 

Unified
Thread
Size
Metric Thread Size
Max Installation Torque
(Inch Pounds)
No. 4
M2.5x0.45
.60
No. 5
M3.5x0.5
1.25
No. 6
M3.5x0.6-6g
1.65
No. 8
M4x0.7-6g
2.15
No. 10
M5x0.8-6g
3.15
1/4
M6x1-6g
6.0
5/16
M8x1.25
11.0
3/8
M10x1.5
16.0
7/16
M11x1.5
22.0
1/2
M12x1.75
28.0
9/16
M14x2.0
36.0
5/8
M16x2.0
55.0
3/4
M20x2.5
70.0
7/8
M22x2.5
95.0
1
M24x3.0
130.0
1-1/8
M30x3.5
160.0
1-1/4
M33x3.5
190.0



Installation into Different Materials
Installation problems can occur when a spring-loaded device supplied with a nylon locking element is installed into soft metals and locking helicoils. Aluminum threads may be damaged by the steel threads of the SLD upon installation making it very difficult for deeper installation or removal. When installing only a few spring loaded devices into soft metals, Vlier recommends that you purchase SLDs without the nylon locking element and use a thread locking adhesive or helicoil. When installing large quantities of SLDs it may be cost-effective to ask Vlier to apply a lighter nylon locking element or apply the nylon locking element in a different location on the body.

Installing Into Helicoils
Locking helicoils can cause the same installation problems as the nylon locking element. You should never use the nylon locking element when also using a locking helicoil. Regular helicoils may be used in conjunction with the nylon locking element but Vlier recommends that you may still want to prototype the installation or discuss it with a Vlier Application Engineer.When using locking helicoils, Vlier suggests that you experiment with different drill sizes during the tapping operation and determine which drill size or class of thread gives you the appropriate amount of thread locking and still allows minimum installation effort.

Using the Vlier Wrench
You can use the Vlier Wrench when installing a spring-loaded device from the front end of the body, but because of its design, the wrench can break if the recommended installation torques are exceeded.

Blind Hole Applications
The bottom few threads of a blind hole are often imperfect threads and can cause difficulty when installing spring-loaded devices. Vlier recommends that blind holes be tapped using bottom taps or tapped deeper than necessary, if possible.

Using Power Screwdrivers
When set on the lowest torque level, power screwdrivers can provide more constant pressure on the slot than can be obtained by using a regular screwdriver. This may allow spring-loaded devices to be installed in tight threads that may not have been possible using a manual screwdriver.

 

 

Learn More About Spring Loaded Devices
What is SLD? Selection Guide SLD Basics Materials Locking Elements Detents/Hole Diameter Installation

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