ENGLISH • METRIC Nord-Lock washers The original wedge-locking solution
The proven original Since the Nord-Lock Group began operations in 1982 we have focused on providing the world’s most effective bolt securing system. Our products are based on leading wedgelocking technology and are recognized for their ability to safely secure bolted joints exposed to severe vibration and dynamic loads. When you choose Nord-Lock you do not only choose a supplier or a manufacturer, you also benefit from a partnership with an expert in bolted joint technology.
Over the years, Nord-Lock washers have been rigorously tested and approved by independent institutes as well as certification authorities. Proven in Junker vibration test The Junker test, according to DIN 65151, is considered the most severe vibration test for bolted connections. During the test, the joint is exposed to transverse movements underneath the bolt head / nut, while the clamping force is continuously measured.
Widely used & globally approved Nord-Lock washers are high end products with documented success in many industries. Our washers are approved by several industry standards and specified by numerous international companies. Industries where Nord-Lock washers are used Nord-Lock washers are used in industries such as: energy, transportation, offshore, mining and quarrying, construction and bridge building, manufacturing and processing, ship building, forestry and agriculture, heavy vehicles, and military.
The key to efficient & secure operations Nord-Lock washers provide more than just a safe locking function, using our washers also improves the general performance of a bolted joint. Product benefits • Maintains high clamp load and thereby ensures the function of the joint Life Cycle Profitability Over the operational life cycle, Nord-Lock products give increased operational reliability and lower maintenance costs while significantly reducing the risks of production stops, accidents and warranty claims.
Using Nord-Lock washers Nord-Lock washers are easy and effective to use while ensuring structural security for applications exposed to vibration and dynamic loads. Possible to verify the locking function Installing the washers The pre-assembled washers are installed in pairs, cam face to cam face. Nord-Lock recommends lubrication when possible. Tightening Tighten Nord-Lock washers with standard tools according to the guidelines (on page 9-11).
Nord-Lock washer material / type guide Application parameter Steel washers Stainless steel (ss) washers 254 SMO ® washers INCONEL® / HASTELLOY® C-276 washers INCONEL® 718 washers Steel type (EN) 1.7182 or equivalent 1.4404 or equivalent 1.4547 or equivalent 2.4819 or equivalent 2.4667 or equivalent Examples of applications General steel applications General stainless steel applications.
Nord-Lock steel washers EN 1.
Torque guidelines Nord-Lock steel washers with zinc flake coating (Delta Protekt®) Nord-Lock steel washers with electro zinc plated bolt grade 8.
Nord-Lock stainless steel washers EN 1.4404 (AISI 316L) or equivalent, surface hardened EN 1.4404 is an austenitic chromium-nickel stainless steel containing molybdenum. This stainless steel also has extra low carbon content in order to reduce the risk of chromium-carbide precipitation. EN 1.4404 is one of the most commonly used stainless steel grades and Nord-Lock washers made of EN 1.4404 are suitable for most applications where no chlorides or acids are present.
Nord-Lock 254 SMO® washers EN 1.4547 or equivalent, surface hardened 254 SMO® is a high performance austenitic stainless steel (according to EN 1.4547) with greater mechanical strength and resistance against corrosion than most austenitic stainless steel grades. The material is resilient against pitting and crevice corrosion due to high contents of chromium, nickel, molybdenum and nitrogen.
Nord-Lock washers joint guide Tapped holes Nord-Lock washers safely lock the bolt against the underlying surface. Counter bores The outer diameter of regular Nord-Lock washers is designed for counter-bore holes according to DIN 974, i.e. the washers fit under the head of standard bolts. Through holes As for all locking washers, through holes require two pairs of Nord-Lock washers – one pair for securing the bolt and a second pair for securing the nut.
Nord-Lock “sp” (enlarged outer diameter) washers Nord-Lock washers are available with an enlarged outer diameter, referred to as “sp” washers. “sp” washers are designed for use on large / slotted holes, painted / sensitive surfaces or soft materials. Use Nord-Lock “sp” washers with flanged bolts or nuts for optimum load distribution. A flanged nut and Nord-Lock “sp” washers increase the load supporting surface for applications with slotted holes.
Your partner for bolting solutions The Nord-Lock Group is continuously developing new innovative solutions. In addition to the Nord-Lock washers, our product offering consists of several technologies, all developed and designed in-house. Contact us to learn more about our current range of products or please visit www.nord-lock.
Performance Services Nord-Lock Performance Services will assist you in identifying ways which your company can increase its competitiveness. A Performance Services project can be initiated to solve a specific problem; alternatively the goal can be to create an overview of possible improvements. Each project is designed to meet customer specific needs and challenges. We can investigate current applications as well as future designs.
Joining parts together is one of the most critical steps when delivering a product or system. The Nord-Lock Group is focused on solving the toughest bolting challenges. We offer a unique combination of bolting expertise and a wide product range, including wedge-locking technology and Superbolt tensioners — all designed and developed in-house. The tools available through Nord-Lock Performance Services add value throughout a project and ensure that your bolting application pays back multiple times.
