Nord-Lock Original Washers

Nord-Lock Original Washers

Nord-Lock Group About Nord-Lock Products Original Washers Selection Guide

Nord-Lock created the original wedge-locking technology that secures bolted joints, even when exposed to severe vibration and dynamic loads. It is impossible for our products to loosen unintentionally due to the wedge created underneath the bolt head and nut.

NORD-LOCK STEEL WASHERS
Applications General steel applications
Material standard EN 1.7182
Size range M3-M130
#5 to 5"
Corrosion resistance Minimum 1,000 hours in salt spray test (according to ISO 9227)
Hardening Through hardened
Washer hardness* ≥ 465HV1
Coating

Basecoat Delta Protekt® KL100, Topcoat VH 302 GZ 
Standard products in range M6-M24 are available with Delta Seal GZ Black top coat (SP items not included)
Bolt grades Up to 12.9
Temperature range*** -50°C to 200°C
Product designation NL
NLsp
Laser marking type code Traceable batch number and type code flZn

* Washer hardness must be greater than the hardness of the mating surfaces in order to assure its mechanical function.

*** Temperature recommendations are based on information from the raw material supplier and testing. The locking function is not affected within the specified range.

NORD-LOCK STAINLESS STEEL WASHERS
Applications General stainless steel applications
Material standard EN 1.4404
Size range M3-M80 
#5 to 3 1/8"
Corrosion resistance PREN 27**
Hardening Surface hardened
Washer hardness* ≥ 520HV0,05
Bolt grades Up to A4-80
Temperature range*** -160°C to 500°C
Product designation NLss
NLspss
Laser marking type code SS

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

NORD-LOCK 254 SMO® WASHERS
Applications Corrosive environment – chloride rich environments, offshore, pumps, heat exchangers, nuclear, food, medical, processing
Material standard EN 1.4547
Size range M3-M39
#5 to 1 1/2"
Corrosion resistance PREN 45**
Hardening Surface hardened
Washer hardness* ≥ 600HV0,05
Temperature range*** -160°C to 500°C
Product designation NLss-254
NLspss-254
Laser marking type code 254

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

 

Nord-Lock Alloy C-276 Washers
Applications Acidic environment – chemical industry, evaporators, offshore, downhole tooling
Material standard EN 2.4819 or equivalent
Size range M4-M20
#8 to 1 1/2"
Corrosion resistance PREN 68**
Hardening Surface hardened
Washer hardness* ≥ 520HV0,05
Temperature range*** -160°C to 500°C
Product designation NLss-276
NLspss-276
Laser marking type code 276

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

Nord-Lock Alloy 718 Washers
Applications High temperatures – gas turbines, turbo charges, incinerators
Material standard EN 2.4668 or equivalent
Size range M4-M20
#5 to 1 1/2"
Corrosion resistance PREN 29**
Hardening Surface hardened
Washer hardness* ≥ 620HV0,05
Temperature range*** -160°C to 700°C
Product designation NLss-718
NLspss-718
Laser marking type code 718

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

All types of Nord-Lock washers
Material type
Steel Stainless
steel (ss)		 254 SMO® ALLOY 
C-276		 ALLOY
718
Applications
General steel applications General stainless steel applications Corrosive environment – chloride rich environments, offshore, pumps, heat exchangers, nuclear, food, medical, processing Acidic environment – chemical industry, evaporators, offshore, downhole tooling High temperatures – gas turbines, turbo charges, incinerators
Material standard
EN 1.7182 EN 1.4404 EN 1.4547 EN 2.4819 or equivalent EN 2.4668 or equivalent
Size range

M3-M130

#5 to 5"

M3-M80

#5 to 3 1/8"

M3-M39

#5 to 1 1/2"

M4-M20

#8 to 1 1/2"

M4-M20

#5 to 1 1/2"
Corrosion resistance
Minimum 1,000 hours in salt spray test (according to ISO 9227) PREN 27** PREN 45** PREN 68** PREN 29**
Hardening
Through hardened Surface hardened Surface hardened Surface hardened Surface hardened
Washer hardness*
≥ 465HV1 ≥ 520HV0,05 ≥ 600HV0,05 ≥ 520HV0,05 ≥ 620HV0,05
Coating
Delta Protekt® KL100 zinc flake coating - - - -
Bolt grades
Up to 12.9 Up to A4-80 Up to A4-80 Up to A4-80 Up to A4-80
Temperature range***
-50°C to 200°C -160°C to 500°C -160°C to 500°C -160°C to 500°C -160°C to 700°C
Product designation
NL
NLsp		 NLss
NLspss		 NLss-254
NLspss-254		 NLss-276
NLspss-276		 NLss-718
NLspss-718
Laser marking type code
flZn SS 254 276 718

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

Selection Guide

Application parameter
Steel Stainless
steel (ss)		 254 SMO® ALLOY 
C-276		 ALLOY
718
Steel type
EN 1.7182 EN 1.4404 EN 1.4547 EN 2.4819 or equivalent EN 2.4668 or equivalent
Examples of applications
General steel applications General stainless steel applications. Non chlorine / acid environments General salt water applications, pumps, chloride applications, heat exchangers, nuclear, desalination, food processing & medical equipment General acidic environments, process and chemical industry, evaporators, offshore downhole tooling Applications with high temperatures, gas turbines, turbo charges, incinerators
Available for bolt sizes

M3-M130

#5 to 5"

M3-M80

#5 to 3 1/8"

M3-M39

#5 to 1 1/2"

M3-M39 available on request

#5 to 1 1/2" available on request

M3-M39 available on request

#5 to 1 1/2" available on request
Washer types

Regular outer diameter (NL3 - NL130)

Enlarged outer diameter (NL3,5sp - NL36sp)

Regular outer diameter (NL3ss-NL80ss)

Enlarged outer diameter (NL3,5spss - NL30spss)

Regular outer diameter (NL3ss-254 - NL39ss-254)

Enlarged outer diameter (NL3,5spss-254 - NL27spss-254)

Regular outer diameter (NL3ss-276 - NL39ss-276)

Enlarged outer diameter (NL3,5spss-276 - NL27spss-276)

Regular outer diameter (NL3ss-718 - NL39ss-718)

Enlarged outer diameter (NL3,5spss-718 - NL27spss-718)
Treatment surface coating
Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ) Surface hardened Surface hardened Surface hardened Surface hardened
Washer hardness*
≥ 465HV1 ≥ 520HV0,05 ≥ 600HV0,05 ≥ 520HV0,05 ≥ 620HV0,05
Corrosion resistance
Minimum 1,000 hours in salt spray test (according to IS09227) PREN 27** PREN 45** PREN 68** PREN 29**
Bolt grades
Up to 12.9 Up to A4-80      
Temperature range***
-50°C to 200°C -160°C to 500°C -160°C to 500°C -160°C to 500°C -160°C to 700°C

 

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers. 

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier and from tests. Locking function not affected within the specification.

Hardness Conversion Table

Vickers
HV		 Brinell
HB		 Rockwell HRC Rockwell HRA 8.8
bolt		 10.9 bolt 12.9 bolt
300 285 29,8 65,5 |    
310 295 31,0 65,8 |    
320 304 32,2 66,4 | 320 HV  
330 314 33,3 67,0 | |  
335 319 33,9 67,3 335 HV |  
340 325 34,4 67,6   |  
350 333 35,5 68,1   |  
360 342 36,6 68,7   |  
370 352 37,7 69,2   |  
380 361 38,8 69,8   380 HV  
385 366 39,3 70,1     385 HV
390 371 39,8 70,3     |
400 380 40,8 70,8     |
410 390 41,8 71,4     |
420 399 42,7 71,8     |
430 409 43,6 72,3     |
435 414 44,1 72,5     435 HV
440 418 44,5 72,8      
460 437 46,1 73,6      
480 (456) 47,7 74,5      
500 (475) 49,1 75,3      
520 (494) 50,5 76,1      
540 (513) 51,7 76,7      

Customer success stories

Customer Cases How DIY Engineering Founded a Joyous, Century-old Sport The Spiribol game is a result of rudimentary engineering and a profound desire to make a positive social impact for all ages Read more
Customer Cases Secure machinery for the toughest forestry harvesting Find out how this global supplier of forestry grapple harvesters builds robust and flexible machinery that will survive even the toughest of forest harvesting. Read more
Customer Cases Corrosion Resistant Washers Perfect to Secure Marine Fenders Nord-Lock wedge-locking washers provide a secure bolting solution to the South Korean shipping infrastructure, tightening marine fenders braced for impact. Read more
Customer Cases Taking a weight off your shoulders Braving the elements and getting close to Nature can be an enlightening experience, especially for children. But proper planning is crucial. Read more
Customer Cases Securing Bolts in Outer Space The upper atmosphere can be tough on equipment. Developing a rocket engine for this environment is a huge challenge. If there are complications in the process, the engine and its associated parts might be damaged. Read more
Customer Cases Ensuring Safety in Car Racing The Korean Formula Student Competition (KSAE) allows engineering students to design and race their own cars - putting their engineering skills to the test in a real-life environment. Read more
Customer Cases A Wind-Win Situation Wind turbine towers are designed to flex and bend, which helps them dissipate the significant forces being exerted upon them. However, this had been causing dangerous failures in the bolts. Read more
Customer Cases Securing Giant Satellite Antenna Radomes in Antarctica Antarctica is one of the coldest and windiest places on earth. These conditions put an extreme amount of pressure on bolted connections to be secured properly. Read more
Customer Cases A Simple Solution for an Advanced Machine With the world’s appetite for LCD displays seemingly insatiable, Hyundai Robotics’ LCD handling machines are in high demand from LCD manufacturers. Read more
Customer Cases When the going gets tough Off-road vehicles are built to handle what would break most cars and trucks. Whether driving through mud or racing up a mountainside, these vehicles need state-of-the-art technology to stay in top condition. Read more
Customer Cases Pushing the boundaries of express trains The central Japan railway Company (JR Central) operates the Shinkansen superexpress bullet trains that connect Tokyo and Osaka – Japan’s two biggest cities. Read more
Customer Cases Customized washers keep KTM motorcycles in the race | Nord-Lock Group Pick any of the world’s most exciting motor races and you will find the orange motorcycles by KTM, Europe’s largest manufacturer, among the top contenders. Read more
Customer Cases Washers reduce costs in propeller assembly Mecklenburger Metallguss GmbH, a world leader in the production of propellers for large container ships chose Nord-Lock as the new standard for all bolted joint applications Read more
Customer Cases SpaceX competition winners chose wedge-locking washers In 2015, Elon Musk, the billionaire behind the futuristic transport technology companies Tesla and SpaceX, launched the Hyperloop Pod Competition. Read more
Customer Cases Washers triple-protect nuclear transports Daher Nuclear Technologies GmbH, located in Hanau close to Frankfurt am Main, Germany, develops containers for transportation of radioactive substances. For obvious reasons, these containers must b... Read more
Customer Cases Cheaper but Better Solution for Tractors With Washers Early in 2017, when Hattat Traktör was testing a new tractor model, they realized that the joints on the air compressor–engine connection bracket were loosening because of vibration. Read more
Customer Cases Focus on security in windy and vibrating environment Dutch company Akkadia manufactures specialist CCTV systems for demanding situations in various industries. Its cameras can be found everywhere, from offshore, to polar regions and deserts. Read more
Customer Cases Nord-Lock Group keeps the railway industry on track Nord-Lock wedge-locking washers are used in all safety-related areas of the railway industry, such as bogies, coupling devices, brake systems, rail dampers. Read more
Customer Cases Washers keep airplanes in the air Look up into the sky in the coastal city of Miri, in north-eastern Sarawak, Malaysia, and you may see Nord-Lock washers in action: inside a radio-controlled aircraft. These hobby airplanes are sold by Byond Horizon, a business that otherwise uses drones to take aerial photos and videos for companies. Read more
Customer Cases Renovating Nuremberg’s metro – without affecting the timetable Renovating an underground railway system without weeks of construction and chaos caused by delays and diversions was previously unheard of. Read more
News Extended temperature range for usage of Nord-Lock steel washers Nord-Lock steel washers have been approved for temperatures down to -50°C by an independent test institute Swerea Kimab and TÜV. Read more
Customer Cases Green technology for sustainable land clearing Mulching machines are exposed to extreme vibration. Extending their life cycle and sharpness of the teeth is vital for sustainable land clearing. Read more
Customer Cases Washers safeguard transport safety To avoid accidents that would put people and the environment in harms way, it is crucial that the transport of liquids is managed safely and efficiently. Read more
Customer Cases Taking wind energy to new depths Offshore wind turbines are an increasingly common sight as the world moves towards more sustainable forms of energy production. Read more
Customer Cases Innovative wind turbine maker gets peace of mind with Nord-Lock Quality and durability are Eastern Wind Power’s top priorities for its 50kW vertical axis wind turbines. Read more
Customer Cases China: Opportunities on the coal market Xi’an Coal Mining Machinery has approved Nord-Lock washers and Superbolt tensioners as specialised components for its shearers and roadheaders. Read more
Customer Cases Safety secures trust For more than 30 years, unsurpassed safety has been synonymous with the Nord-Lock Group. Read more
Customer Cases Powerful circles Nord-Lock enlarged external diameter wedge locking washers make the connections on a circular storage unit for lignite absolutely secure. Read more
Customer Cases Order in the court The Challenge Invented 50 years ago in Mexico, the racquet sport padel tennis is now played all over Europe. In Sweden, sport floor specialist Unisport is riding the hype, having built around 60 pa... Read more
Customer Cases Rallying for safe bolted joints Motor sports are not easy on the cars. High speed, torque, vibrations, g-forces and hard knocks put enormous strain on the cars and their components. Read more

Buy Nord-Lock washers online

Nord-Lock washers in blister packages are now available. Use the following selector to find the washers you need!

1. Bolt size

2. Washer material

3. Washer outer diameter

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Nord-Lock product range

Nord-Lock wedge-locking washers prevent bolt loosening Nord-Lock Nord-Lock Washers Wedge-locking security for bolted joints subjected to extreme vibration and dynamic loads. Read more
Nord-Lock X-series washer combines wedge-locking with an exceptional spring effect to secure against multiple bolt loosening factors Nord-Lock NORD-LOCK® X-SERIES WASHERS Maximum security for critical bolted joints exposed to spontaneous bolt loosening and slackening. Read more
Nord-Lock steel construction washers are designed for bolted connections in steel structures Nord-Lock NORD-LOCK STEEL® CONSTRUCTION WASHERS Optimal contact between bolts and washers used in steel construction applications, including HV and HR sets. Read more
Nord-Lock wheel nuts safely secure wheels on on-road and off-road heavy vehicles Nord-Lock NORD-LOCK® WHEEL NUTS High clamping force that eliminates wheel loosening on heavy vehicles operating under extreme conditions. Read more
Combi bolt washers from Nord-Lock are specifically designed to be captivated on a bolt, known as SEMS Nord-Lock Nord-Lock Combi Bolt Washers Additional layer of security for applications through permanent attachment to bolt (SEMS) Read more
Customized washers from Nord-Lock can include special materials, measurements, sizes, coatings or changes in geometry Nord-Lock Nord-Lock Customized Solutions Custom designed bolting solutions for your unique application requirements Read more

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