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Serrated WashersAccessories 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
100SW4M1000.1615.709----
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
100SW4M1004.1145.0----

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