Serrated Washers Accessories for cable glands, available in stainless steel

‘Shake-proof’ serrated washers

Available in Stainless Steel, these ‘shake-proof’ Serrated Washers are fitted internally to the equipment before a locknut and act as an anti-vibration device to prevent the Cable Gland or accessory from inadvertently loosening in service.

Self-loosening should be avoided according to clause 6.4.1 of IEC 60079-14, this can occur through relative motion over time even without vibration, due to differential thermal effects caused as a result of either differences in temperature or differences in clamped materials.

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Product Selection Table

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Metric Ordering Reference (Stainless Steel)Reference Diameter '"A"'Minimum ThicknessExternal Diameter "'B'"NPT Ordering Reference (Stainless Steel)Reference Diameter '"A"'Minimum ThicknessExternal Diameter '"B'"
16SW4M160.1541.004050NPTSW41/2'" NPT0.1541.28
20SW4M200.1541.28075NPTSW43/4'" NPT0.1541.575
25SW4M250.1541.575100NPTSW41"' NPT0.1541.713
32SW4M320.1541.713125NPTSW41 1/4"' NPT0.1542.539
40SW4M400.1542.539150NPTSW41 1/2"' NPT0.1543.15
50SW4M500.1543.15200NPTSW42"' NPT0.1543.937
63SW4M630.1543.937250NPTSW42 1/2"' NPT0.1544.409
75SW4M750.1614.409300NPTSW43"' NPT0.1615.315
90SW4M900.1615.315350NPTSW43 1/2"' NPT0.1615.709
Metric Ordering Reference (Stainless Steel)Reference Diameter '"A'"Minimum ThicknessExternal Diameter "B'"NPT Ordering Reference (Stainless Steel)Reference Diameter '"A"'Minimum ThicknessExternal Diameter '"B'"
16SW4M163.925.5050NPTSW41/2"' NPT3.932.5
20SW4M203.932.5075NPTSW43/4'" NPT3.940.0
25SW4M253.940.0100NPTSW41"' NPT3.943.5
32SW4M323.943.5125NPTSW41 1/4"' NPT3.964.5
40SW4M403.964.5150NPTSW41 1/2'" NPT3.980.0
50SW4M503.980.0200NPTSW42"' NPT3.9100.0
63SW4M633.9100.0250NPTSW42 1/2"' NPT3.9112.0
75SW4M754.1112.0300NPTSW43"' NPT4.1135.0
90SW4M904.1135.0350NPTSW43 1/2"' NPT4.1145.0
Additional Information

Installation Accessories

Depending upon the specific form of protection of the main equipment it may be necessary (and often advisable) to fit a sealing washer at the cable entry interface to maintain the appropriate Ingress Protection level of the enclosure. For Increased Safety (Ex e) equipment, or Increased Safety terminal chambers included in Ex de (or Ex db eb) equipment, a sealing washer is recommended to maintain the minimum ingress protection rating, and should always be fitted.

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Threaded Cable Entries into Enclosure Walls of Different Thicknesses

When cable entries are required to be installed on equipment which is provided with threaded entries, careful consideration should be given to the depth of the entry holes. If the hole depth in the equipment exceeds the length of threads in the cable entry there may be a risk of damage to the cables as they enter the enclosure. For example, some electric motors have a wall thickness of 20.0mm or more at the gland plate or cable entry point. In that case, where the cable passes through a threaded hole into a metal enclosure which has walls thicker than the length of the cable entry device, care must be taken to avoid damaging the cable on the exposed threads (Figure 110.).

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