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C A B L E G L A N D A N D C A B L E C O N N E C T I O N S P E C I A L I S T S

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Brass Locknuts are the recommended items used in securing brass cable glands,unions, adaptors, reducers, and stopper plugs to a gland plate or into equipment.

Zinc Plated Mild Steel locknuts are a cost effective alternative to brass locknuts andshould be used only in dry, low humidity conditions.

Aluminium locknuts are recommended when installing CMP Aluminium Cable Glandsto prevent the electrolytic action of galvanic corrosion which can occur when dis-similar metals are coupled together.

Note: Alternative materials are also available. Please refer to Table ‘E’ on page 161 for orderingreference numbers, e.g 20LN4 for M20 Stainless Steel Locknut, 050NPTLN4 for 1/2” NPTStainless Steel Locknut.

LOCKNUTS

METRIC - LOCKNUTS

OrderingReference(Brass)

ThreadDiameter

‘A’

MinimumThickness

Across FlatsDimension

‘B’

Across CornersDiameter

‘C’

16LN M16 X 1.5 3.2 22.0 24.2

20LN M20 X 1.5 3.2 24.0 26.4

25LN M25 X 1.5 3.2 30.0 33.0

32LN M32 X 1.5 3.2 36.0 39.6

40LN M40 X 1.5 4.8 46.0 50.6

50LN M50 X 1.5 6.3 55.0 60.5

63LN M63 X 1.5 6.3 70.0 77.0

75LN M75 X 1.5 6.3 85.0 93.5

90LN M90 X 2.0 9.5 106.0 116.6

100LN M100 X 2.0 9.5 123.0 135.3

115LN M100 X 2.0 9.5 130.0 143.0

All dimensions shown are in millimetres unless otherwise stated

NPT - LOCKNUTS

OrderingReference(Brass)

ThreadDiameter

‘A’

MinimumThickness

Across FlatsDimension

‘B’

Across CornersDiameter

‘C’

050NPTLN 1/2” NPT 0.187 1.053 1.158

075NPTLN 3/4”NPT 0.187 1.287 1.416

100NPTLN 1” NPT 0.187 1.599 1.759

125NPTLN 1 1/4” NPT 0.187 1.950 2.145

150NPTLN 1 1/2”NPT 0.195 2.340 2.574

200NPTLN 2” NPT 0.195 2.730 3.003

250NPTLN 2 1/2” NPT 0.390 3.120 3.432

300NPTLN 3” NPT 0.390 3.900 4.290

350NPTLN 3 1/2” NPT 0.437 4.446 4.891

400NPTLN 4” NPT 0.437 5.070 5.577

All dimensions shown are in millimetres unless otherwise stated

Available in Stainless Steel as standard, these “shake-proof” Serrated Washers fittedinternally to the equipment and before a locknut act as an anti-vibration device toprevent the cable gland or other cable entry device and locknut arrangement frominadvertently loosening in service.

Note: Alternative materials are also available. Please refer to Table ‘E’ on page 161for ordering reference numbers, e.g 20SW4 for M20 Stainless Steel SerratedWasher, 050NPTSW4 for 1/2” NPT Stainless Steel Serrated Washer.

SERRATED WASHERS

METRIC - SERRATED WASHERSOrderingReference

(Plated Steel)

ReferenceDiameter

‘A’

MinimumThickness

External Diameter

‘B’

16SW M16 3.7 25.5

20SW M20 3.9 32.5

25SW M25 3.9 40.0

32SW M32 3.9 43.5

40SW M40 3.9 64.5

50SW M50 3.9 80.0

63SW M63 3.9 100.0

75SW M75 3.9 112.0

90SW M90 4.1 135.0

100SW M100 4.1 144.6

150SW M115 4.1 159.0

All dimensions shown are in millimetres unless otherwise stated

NPT - SERRATED WASHERS

OrderingReference

(Plated Steel)

ReferenceDiameter

‘A’

MinimumThickness

External Diameter

‘B’

050NPTSW 1/2” NPT 0.152 1.268

075NPTSW 3/4”NPT 0.152 1.560

100NPTSW 1” NPT 0.152 1.697

125NPTSW 1 1/4” NPT 0.152 2.516

150NPTSW 1 1/2”NPT 0.152 3.120

200NPTSW 2” NPT 0.152 3.900

250NPTSW 2 1/2” NPT 0.159 4.368

300NPTSW 3” NPT 0.159 5.265

350NPTSW 3 1/2” NPT 0.159 5.639

400NPTSW 4” NPT 0.159 6.201

All dimensions shown are in millimetres unless otherwise stated

A

A

BB

C

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