Cable Gland Locknuts Accessories for cable glands, available in brass, zinc plated mild steel, aluminium and stainless steel

Brass cable gland locknuts: Recommended in securing brass Cable Glands and Accessories to a gland plate or into equipment. In metric thread form CMP offers brass locknuts in a choice of standard duty and heavy duty options for sizes up to and including M32. The part numbers are distinguished by an additional letter H, e.g. 20LN = standard duty, and 20HLN = heavy duty. From size M40 all brass metric locknuts are considered to be heavy duty.

Zinc Plated Mild Steel cable gland locknuts: A cost effective alternative to brass locknuts and should be used only in dry, low humidity conditions.

Aluminium cable gland locknuts: Recommended when installing aluminium Cable Glands to prevent the galvanic corrosion which can occur when dissimilar metals are coupled together.

Stainless Steel cable gland locknuts: Corrosion resistant with increased strength at high temperatures.

Please refer to ordering reference numbers, e.g. 20LN4 for M20 Stainless Steel Locknut, 050NPTLN4 for 1/2” NPT Stainless Steel Locknut.

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Product Selection Table

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Ordering Reference (Brass)Thread Diameter '"A'"Nominal ThicknessAcross Flats Dimension "'B'"Across Corners Diameter '"C'"Ordering Reference (Brass)Thread Diameter '"A'"Nominal ThicknessThickness Across Flats Dimension '"B'"Across Corners Diameter '"C"'
16LNM16 X 1.50.1260.8661.000050NPTLN1/2"' NPT0.1891.0631.228
16HLNM16 X 1.50.1850.8661.000075NPTLN3/4"' NPT0.1891.2991.500
20LNM20 X 1.50.1260.9451.091100NPTLN1"' NPT0.1891.6141.862
20HLNM20 X 1.50.1850.9451.091125NPTLN1 1/4"' NPT0.1891.9692.272
25LNM25 X 1.50.1261.1811.362150NPTLN1 1/2"' NPT0.1972.3622.728
25HLNM25 X 1.50.1851.1811.362200NPTLN2'" NPT0.1972.9533.488
32LNM32 X 1.50.1261.4171.638250NPTLN2 1/2'" NPT0.3943.3073.819
32HLNM32 X 1.50.1851.4171.638300NPTLN3"' NPT0.3943.9374.547
40LNM40 X 1.50.1891.8112.091350NPTLN3 1/2"' NPT0.4414.5005.197
50LNM50 X 1.50.2482.1652.500-----
63LNM63 X 1.50.2482.7563.181-----
75LNM75 X 1.50.2483.3073.819-----
90LNM90 X 2.00.3744.1734.819-----
100LNM100 X 2.00.3744.8435.591-----
All dimensions shown are in inches unless otherwise stated
Metric Ordering Reference (Brass)Thread Diameter '"A'"Nominal ThicknessAcross Flats Dimension "'B"'Across Corners Diameter '"C'"NPT Ordering Reference (Brass)Thread Diameter '"A'"Nominal ThicknessThickness Across Flats Dimension "'B'"Across Corners Diameter "'C"'
16LNM16 X"' NPT4.827.031.2
16HLNM16 X 1.54.722.025.4075NPTLN3/4"' NPT4.833.038.1
20LNM20 X"' NPT4.841.047.3
20HLNM20 X 1.54.724.027.7125NPTLN1 1/4'" NPT4.850.057.7
25LNM25 X 1/2"' NPT5.060.069.3
25HLNM25 X 1.54.730.034.6200NPTLN2"' NPT5.075.088.6
32LNM32 X 1/2"' NPT10.084.097.0
32HLNM32 X 1.54.736.041.6300NPTLN3"' NPT10.0100.0115.5
40LNM40 X 1.54.846.053.1350NPTLN3 1/2"' NPT11.2114.3132.0
50LNM50 X 1.56.355.063.5-----
63LNM63 X 1.56.370.080.8-----
75LNM75 X 1.56.384.097.0-----
90LNM90 X 2.09.5106.0122.4-----
100LNM100 X 2.09.5123.0142.0-----
All dimensions shown are in millimetres unless otherwise stated
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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Typical Installation Configurations

The illustrations provided below are indicative of some of the common methods of installation configurations adopted. These are for informative guidance only and relevant site conditions along with any specified National or International codes of practice must always take precedence. The accessories available offer a wide, flexible approach in mounting, sealing and earthing connection provision. Selection and installation according to the Engineering Specification may vary from these illustrations.

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