Rondelle Originali Nord-Lock

Rondelle Originali Nord-Lock

Nord-Lock ha creato l'originale tecnologia di fissaggio a cunei che blocca le giunzioni bullonate, anche se esposte a forti vibrazioni e carichi dinamici. Grazie al cuneo creato sotto la testa della vite e il dado, l’allentamento involontario dei nostri prodotti è impossibile.

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.

Guida alla scelta

Parametri di applicazione
Acciaio Acciaio inossidabile (ss) 254 SMO® ALLOY
C-276
ALLOY
718
Tipo di acciaio
EN 1.7182  EN 1.4404  EN 1.4547  EN 2.4819 o equivalente EN 2.4668 o equivalente
Esempi di applicazione
Applicazioni comuni in acciaio Applicazioni comuni in acciaio inossidabile. Ambienti non acidi e senza cloro Applicazioni comuni in acqua salina, pompe, applicazioni con cloro, scambiatori di calore, nucleare, desalinizzazione, industria alimentare e attrezzature mediche Ambienti acidi comuni, industria chimica e di processo, evaporatori, perforazioni offshore Applicazioni ad alte temperature, turbine a gas, turbocompressori, inceneritori
Disponibile per bulloni

M3 - M130

#5 - 5"

M3 - M80

#5 - 3 1/8"

M3 - M39

#5 - 1 1/2"

M3 - M39 disponibile su richiesta

#5 - 1 1/2" disponibile su richiesta

M3 - M39 disponibile su richiesta

#5 - 1 1/2" disponibile su richiesta

Tipo di rondelle

Diametro esterno regolare (NL3 - NL130)

Diametro esterno maggiorato (NL3,5sp - NL36sp)

Diametro esterno regolare (NL3ss-NL80ss)

Diametro esterno maggiorato (NL3,5spss - NL30spss)

Diametro esterno regolare (NL3ss-254 - NL39ss-254)

Diametro esterno maggiorato (NL3,5spss-254 - NL27spss-254)

Diametro esterno regolare (NL3ss-276 - NL39ss-276)

Diametro esterno maggiorato (NL3,5spss-276 - NL27spss-276)

Diametro esterno regolare (NL3ss-718 - NL39ss-718)

Diametro esterno maggiorato (NL3,5spss-718 - NL27spss-718)

Trattamento / Rivestimento superficiale
Temprato in profondità Delta Protekt® base coat (KL100) and top coat (VH302GZ) Superficie indurita Superficie indurita Superficie indurita Superficie indurita
Durezza delle rondelle*
≥ 465HV1 ≥ 520HV0,05 ≥ 600HV0,05 ≥ 520HV0,05 ≥ 620HV0,05
Resistenza alla corrosione
Minimo 1,000 ore nel test in nebbia salina (in conformità a IS09227) PREN 27** PREN 45** PREN 68** PREN 29**
Grado di resistenza dei bulloni
Fino a 12.9 Fino a A4-80      
Range di temperatura***
Da -50°C a 200°C Da -160°C a 500°C Da -160°C a 500°C Da -160°C a 500°C Da -160°C a 700°C

 

* Per garantire la funzione bloccante meccanica unica delle rondelle Nord-Lock, la durezza delle superfici di appoggio deve essere inferiore a quella delle rondelle Nord-Lock (vedi tabella sopra). 

** PREN (Pitting Resistance Equivalent Number / Indice di resistenza alla corrosione da vaiolatura)) = %Cr + 3,3x%Mo + 16x%N. . I dati nella tabella si riferiscono al materiale di base.

*** Le indicazioni sulle temperature sono basate sulle informazioni ricevute dal fornitore della materia prima. La funzione bloccante non è pregiudicata entro le specifiche.

Durezza rondelle

Per garantire la funzione unica di fissaggio a cunei delle rondelle Nord-Lock, la durezza delle superfici di accoppiamento non deve superare quella delle rondelle Nord-Lock.


Tipo di rondella Gamma Rivestimento in lamelle di zinco flZnnc - 600 Non rivestita
Rondelle in acciaio (Temprate in profondità) NL3 - NL42
NL45 - NL130
≥ 465 HV1
≥ 465 HV1
 
Rondelle in acciaio inossidbile (Superficie indurita) NL3ss - NL80ss   ≥ 520 HV0.05
Rondelle SMO 254® NL3ss-254 - NL80ss-254   ≥ 600 HV0.05

 

Tabella conversione durezze

Vickers
HV
Brinell
HB
Rockwell
HRC
Rockwell
HRA
Bullone
8.8
Bullone
10.9
Bullone
12.9
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      

Le success story dei nostri clienti