Joining Lock Nuts

Why there are two colors in the same batch of products?

Why there are two colors in the same batch of products?

Ecrou SNEP inox A2- difference couleur

 

Don’t panic!

Note, there are different batch numbers!!!

Certain materials' features cannot always be guaranteed to be exactly alike in production.

You can explain to the customer that the visual appearance of nuts surfaces is dependent upon the colour and coating.

We cannot guarantee that a certain color will always have the same shade.

The colour formed when stainless steel is heated,  is dependent on several factors that are related to the oxidation resistance of the steel.

The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.

However, there are several factors that affect the degree of colour change

The colours formed can only be used as an indication of the temperature to which the steel has been heated.

 

Important!

to prevent galling (lock nuts can generate friction and heat during installation, which cause the nut and bold to tighten while it’s not completely installed)

In your case, the first batch number has a natural color look.

The second batch of 226 pieces has an extra protection against galling which makes the nuts look shiny white silver look.

It’s only recently that the stainless steel nuts are now having also this feature.

You should explain to your customer that the natural color nuts are 100% performance and corrosion resistant as the ‘silver’ looking ones.

 

 

Qu'est ce que les écrous HFR ?

Qu'est ce que les écrous HFR ?

Les écrous HFR sont des écrous autofréinés à 2 fentes.

[caption id="attachment_3906" align="alignleft" width="300"]Ecrou HFR écrous HFR[/caption]

Les écrous HFR sont disponibles en plusieurs matières comme des nuances d'acier zingué et d'inox.

Beaucoup utilisé dans le domaine ferroviaire, les écrous HFR sont idéales par leur haute résistance mécanique. Les écrous HFR ont aussi une très grande résistance à la corrosion.

Les écrous HFR sont disponibles en stocks sous la référence des Joining Lock Nuts.

Veuillez retrouver ci-dessous le liens du site Joining Lock Nuts pour pouvoir télécharger le catalogue inclus les écrous HFR :

Vous retrouverez les écrous HFR et pourrez identifier les n°de référence JL.

Si vous avez des questions sur les écrous HFR, n'hésitez pas à nous contacter.

 

 

Available alternative to ESNH80 snep nut / ESN H80 snep nut

Available alternative to ESNH80 snep nut / ESN H80 snep nut

The availability of ESNH80 snep nut/ ESN H80 snep nut is strongly diminishing, and eventually there won't be any nuts according to ESNH80 / ESN H80 available.
We started with an alternative to ESNH80 / ESN H80 in the Joining Lock Nut series.

For more details on the Joining Lock Nut series, follow one of the links below:
Joining Lock Nut website, Joining Lock Nut Anemo webpage

These products are fully capable of replacing the nuts according to ESNH80 snep nut/ ESN H80 snep nut.
They have the same mechanical properties of ESNH80 snep nut/ ESN H80 snep nut, and are created with the same dimensioning of the  ESNH80 snep nut/ ESN H80 snep nut.

The new product line in the Joining Lock Nut series that replaces the ESNH80 snep nut/ ESN H80 snep nut,
is the line JLsl. All nuts according to this line have there reference starting with these 4 letters.

These products will soon be featured in our catalogs.
Below you can find the basic technical drawing on these products.
Might you have any questions, you can always contact our engineers.

JLsl technical drawing JLsl technical drawing

 

What is the standard finish of Joining Lock Nuts?

What is the standard finish of Joining Lock Nuts?

Joining Lock Nuts are available in various materials.
According to the material grade, the nuts have a standard finish.
The standard finishes can be found below

Steel Class 8 and Class 10, have as standard finsh a white lanthanum coating.
A2 grade nuts are left blank.
A4 grade nuts are standard finished with an antigalling Stanal 400, making them look more grey.

 

Which DTR part numbers do you have available for the JL nuts?

Which DTR part numbers do you have available for the JL nuts?

The Joining Lock nuts are widely used in the transport industry. Therefor our parts may get some specific part numbers by the company who implements them. We supply many parts for Alstom. As it is often not easy to source the correct part number, we have made a list of their part numbers that we have already supplied.

  • DTR0021373057 : ECROU H FR 1 FT.NFE25-411-M6-8 - Joining Lock nuts JLsM6x100CL8
  • DTR0021373187 : ECROU H FR 1 FT.NFE25-411-M8-8 - Joining Lock nuts JLsM8x125CL8
  • DTR0009907228 : ECROU H FR 2 FT.NFE25-411-M6-8 - Joining Lock nuts JLdM6x100CL8
  • DTR0009907232 : ECROU H FR 2 FT.NFE25-411-M8-8 - Joining Lock nuts JLdM8x125CL8
  • DTR0021371212 : ECROU 25409 A2 - Joining Lock nuts JLphM4x070A2
  • DTR00213721BC: ECROU H FR 1 FT.NFE25-411-M5-A2-70 - Joining Lock nut JLsM5x080A2

What is the locking torque of a stainless steel joining lock nut?

What is the locking torque of a stainless steel joining lock nut?

the torque depends on the material class of the self locking nut

Standard threads Quality class tightening tension in the bolt locking torque Nm
torque kN 1st deturn 5th deturn
in Nm MIN (µ = 0,20) MAX (µ = 0,12) MIN MIN
M3x0,5 A2 or A4-70 1,06 1,13 1,81 0,15 0,50
A2 or A4-80 1,36 1,5 2,41
M4x0,7 A2 or A4-70 2,31 1,97 3,16 0,20 0,70
A2 or A4-80 3,01 2,63 4,21
M5x0,8 A2 or A4-70 4,43 3,19 5,11 0,30 1,50
A2 or A4-80 5,81 4,26 6,81
M6x1 A2 or A4-70 7,6 4,52 7,23 0,40 1,70
A2 or A4-80 10 6,03 9,64
M8x1,25 A2 or A4-70 17,6 8,23 13,17 0,60 2,80
A2 or A4-80 23,6 10,98 17,56
M10x1,5 A2 or A4-70 35,1 13,05 20,88 1,10 3,30
A2 or A4-80 46,6 17,4 27,84
M12x1,75 A2 or A4-70 60,9 18,96 30,34 1,90 4,00
A2 or A4-80 79,9 25,29 40,46
M14x2 A2 or A4-70 95,5 25,88 41,4 2,50 5,50
A2 or A4-80 126,5 34,5 55,2
M16x2 A2 or A4-70 147,5 35,33 56,52 3,50 7,70
A2 or A4-80 195,5 47,1 75,36
M18x2,5 A2 or A4-70 204 43,2 69,12 6,00 10,00
A2 or A4-80 270 57,6 92,16
M20x2,5 A2 or A4-70 286,5 55,13 88,2 8,50 14,50
A2 or A4-80 379,5 73,5 117,6

µ = 0,20 corresponds with 50% Re of the bolt
µ = 0,12 corresponds with 80% Re of the bolt
this is the norm NFE25-035

Why use a joining lock nut to fasten compressor valves?

Why use a joining lock nut to fasten compressor valves?

Your advantages to switch over to a joining lock nut:
1)      Single piece joining lock nut that does not require specific knowledge or multiple tools for installation
2)      A locking fastener with prevailing torque that functions completely independent of any preload
3)      50% quicker installation
4)      Consistent prevailing torque enabling exact bolt tensions to be achieved with each installation
5)      Reduce inventory (single piece instead of two pieces) eliminating of mix-ups when matching top and bottoms
6)      No galling and consistent friction coefficients for stainless steel utilizing a unique, permanent tin based anti-galling treatment

 

joinig lock nuts for compressor valves

WHAT TORQUES ARE APPLIED ON THESE NUTS WHEN USED ON VALVES?

WHAT TORQUES ARE APPLIED ON THESE NUTS WHEN USED ON VALVES?

The locking torque for class 8 material locking nuts can be find in this table, they are according to the norm DIN EN ISO 2320

Standard threads tightening Locking torque in  N.m
torque 1st turn 1st deturn 5th deturn
in kN MAX MIN MIN
M3x0,5 2,2 0,43 0,12 0,08
M4x0,7 3,8 0,90 0,18 0,12
M5x0,8 6,2 1,60 0,29 0,20
M6x1 8,7 3,00 0,45 0,30
M8x1,25 15,9 6,00 0,85 0,60
M10x1,5 25,3 10,50 1,50 1,00
M12x1,75 36,7 15,50 2,30 1,60
M14x2 50 24,00 3,30 2,30
M16x2 68,2 32,00 4,50 3,00
M18x2,5 86,2 42,00 6,00 4,20
M20x2,5 110 54,00 7,50 5,30
M22x2,5 136 68,00 9,50 6,50
M24x3 159 80,00 11,50 8,00
M27x3 206 94,00 13,50 10,00
M30x3,5 253 108,00 16,00 12,00
Fine Threads tightening Locking torque in  N.m
torque 1st turn 1st deturn 5th deturn
in kN MAX MIN MIN
M8x1 17 6,00 0,85 0,60
M10x1 28,1 10,50 1,50 1,00
M10x1,25 26,6 10,50 1,50 1,00
M12x1,25 41 15,50 2,30 1,60
M12x1,50 38,3 15,50 2,30 1,60
M14x1,50 54,4 24,00 3,30 2,30
M16x1,5 72,7 32,00 4,50 3,00
M18x1,5 97,5 42,00 6,00 4,20
M20x1,5 122 54,00 7,50 5,30
M22x1,5 150 68,00 9,50 6,50
M24x2 173 80,00 11,50 8,00
M27x2 224 94,00 13,50 10,00
M30x2 280 108,00 16,00 12,00

Can we receive a printed catalogue?