What are Nord-Lock washers used for?
What are Nord-Lock washers used for?
Nord-Lock washers safely lock the nut on stud bolts and eliminate the need for adhesives. To optimize the load distribution for applications with large / slotted holes or with soft underlying surface, use a flanged nut / bolt together with Nord-Lock “SP” washers with enlarged outer diameter.
How effective are lock washers?
The body of evidence, based upon both experience and experimental results, is that they do not prevent loosening and can be shown to actually speed up the rate of loosening in many cases. Junker originally showed in his work published in 1969 that these washers are ineffective in preventing loosening.
Can I reuse a lock washer?
Can lock washers get reused? Some lock washers can be reused. Internal and external tooth lock washers cannot typically get re-used as they have teeth that get bent when installed. Split ring lock washers can be reused.
Do lock washers work NASA?
However, the washer is normally flat by the time the bolt is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent.In summary, a lockwasher of this type is useless for locking.” NASA, these are the brilliant minds that send people into outer space.
Should you use a flat washer with a lock nut?
Depending on what you’re doing, the flat washer/lock washer/nut order on your bolt will affect how well the nut and bolt work. Flat washers may be used on either the bolt side, the nut side or both sides of the fastener. Flat washers help to distribute the force of tightening the nut by increasing the surface area.
Should you use lock washers with lock nuts?
To make the right decision, consider the final environment and type of application. Here is the basic breakdown of when you will want to use a locknut over a lock washer: When you need something that can handle the pressure that comes with torquing down a bolt or screw, choose a lock washer.
Should a flat washer be used with a lock washer?
In general, I use a flat washer under a split locking washer to protect the base material, plating, or coating from damage caused by the split washer action. I may also use the flat washer to distribute the fastener load or ensure the split washer does not fall or grind into a larger clearance hole feature.
Are Lockwashers effective?
They are still used on many applications in the belief that they will will “lock” the nut/bolt to the joint and prevent loosening. The body of evidence, based upon both experience and experimental results, is that they do not prevent loosening and can be shown to actually speed up the rate of loosening in many cases.
What is the Nord lock test method?
Nord-Lock wedge-locking washers have been rigorously tested and approved by independent institutes as well as certification authorities.The Junker test is the most rigorous method for testing bolted joints. During the test, the joint is exposed to transverse movements underneath the bolt head and nut, while clamping force is continuously measured.
What grade bolts do Nord lock washers work with?
It is treated with Delta Protekt®, a surface coating that provides excellent corrosion protection. Nord-Lock washers work with all common bolt grades such as 4.8, 5.6, 8.8, 10.9 and 12.9.
What is the difference between original washers and Nord lock washers?
Nord-Lock SP washers have the same wedge-locking design as original washers, but with an enlarged outer diameter. This ensures the load is distributed over a larger area, which is gentler for sensitive surfaces.