Description
Technical
‘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.
Product Table
Metric
| Metric Ordering Reference (Stainless Steel) | Reference Diameter “A” | Minimum Thickness | External Diameter “B” | NPT Ordering Reference (Stainless Steel) | Reference Diameter “A” | Minimum Thickness | External Diameter “B” |
| 16SW4 | M16 | 3.9 | 25.5 | 050NPTSW4 | 1/2″” NPT | 3.9 | 32.5 |
| 20SW4 | M20 | 3.9 | 32.5 | 075NPTSW4 | 3/4″ NPT | 3.9 | 40.0 |
| 25SW4 | M25 | 3.9 | 40.0 | 100NPTSW4 | 1″” NPT | 3.9 | 43.5 |
| 32SW4 | M32 | 3.9 | 43.5 | 125NPTSW4 | 1 1/4″” NPT | 3.9 | 64.5 |
| 40SW4 | M40 | 3.9 | 64.5 | 150NPTSW4 | 1 1/2″ NPT | 3.9 | 80.0 |
| 50SW4 | M50 | 3.9 | 80.0 | 200NPTSW4 | 2″” NPT | 3.9 | 100.0 |
| 63SW4 | M63 | 3.9 | 100.0 | 250NPTSW4 | 2 1/2″” NPT | 3.9 | 112.0 |
| 75SW4 | M75 | 4.1 | 112.0 | 300NPTSW4 | 3″” NPT | 4.1 | 135.0 |
| 90SW4 | M90 | 4.1 | 135.0 | 350NPTSW4 | 3 1/2″” NPT | 4.1 | 145.0 |
| 100SW4 | M100 | 4.1 | 145.0 | – | – | – | – |
Imperial
| Metric Ordering Reference (Stainless Steel) | Reference Diameter “A” | Minimum Thickness | External Diameter “B” | NPT Ordering Reference (Stainless Steel) | Reference Diameter “A” | Minimum Thickness | External Diameter “B” |
| 16SW4 | M16 | 0.154 | 1.004 | 050NPTSW4 | 1/2″ NPT | 0.154 | 1.28 |
| 20SW4 | M20 | 0.154 | 1.28 | 075NPTSW4 | 3/4″ NPT | 0.154 | 1.575 |
| 25SW4 | M25 | 0.154 | 1.575 | 100NPTSW4 | 1″” NPT | 0.154 | 1.713 |
| 32SW4 | M32 | 0.154 | 1.713 | 125NPTSW4 | 1 1/4″” NPT | 0.154 | 2.539 |
| 40SW4 | M40 | 0.154 | 2.539 | 150NPTSW4 | 1 1/2″” NPT | 0.154 | 3.15 |
| 50SW4 | M50 | 0.154 | 3.15 | 200NPTSW4 | 2″” NPT | 0.154 | 3.937 |
| 63SW4 | M63 | 0.154 | 3.937 | 250NPTSW4 | 2 1/2″” NPT | 0.154 | 4.409 |
| 75SW4 | M75 | 0.161 | 4.409 | 300NPTSW4 | 3″” NPT | 0.161 | 5.315 |
| 90SW4 | M90 | 0.161 | 5.315 | 350NPTSW4 | 3 1/2″” NPT | 0.161 | 5.709 |
| 100SW4 | M100 | 0.161 | 5.709 | – | – | – | – |