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Busbar insulators

Polyester, glassfilled
  Green colored Standoffs are Stock Types
Material Nominal Voltage HEXThread Product-
Detail Information: Click on the Distance
<--------------- Lenght L in mm -------------->
Polyester, glassfilled 1000 / 1400 VSW21M6HC21.26-HF6.08CF6.08
Polyester, glassfilled 1000 / 1400 VSW21M8 - M6HC21.26-HF8.08CF6.08
Polyester, glassfilled 1000 / 1400 VSW21M8HC21.26-HF8.08CF8.08
Polyester, glassfilled 1900 / 2600 VSW21M6HC21.35-HF6.08CF6.08  
Polyester, glassfilled SW21M8HC21.35-HF8.08CF8.08  
If customers ask for other hex, thred or length, and the quantity is profitable, we can produce.

This information is applicable to following articles:
High Voltage Insulator MI, Polystyrol HEX knob IS and Polystyrol HEX knob ISS, ISK, ISD
Torque chart
recommended values - indicative only
Bolt size Grade 4,8
M Torque Nm
M4 1,5
M5 3,0
M6 5,1
M8 12
M10 25
M12 43
M14 68
M16 105
M18 145
M20 205
M22 275
M24 350

Recommended max. tightening torque in Nm for untreated oil-smeared screws.
Friction coefficient µ=0.125, torque corresponds to approx. 62% of tensile bolt stress.
Friction coefficient µ=0.14, torque corresponds to approx. 90% of tensile bolt stress.

Every bolted joint is unique and the optimum tightening torque should be determined for each application by careful examination. A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The rotation of a bolt (torque) at some point causes it to stretch (tension).

Several factors affect how much tension occurs when a given amount of tightening torque is applied.

  • The first factor is the bolt's diameter.
  • The second factor is the bolts grade. It takes more force to stretch an SAE grade 8 bolt (or a 12.9 quality bolt) than it does to stretch an SAE grade 5 bolt (or a 8.8 quality bolt) because of the greater material strength.
  • The third factor indicates that harder, smoother and/or slicker bolting surfaces, such as threads and bearing surfaces, require less rotational force (torque) to stretch (tension) a bolt than do softer, rougher and stickier surfaces.