Products > Locknuts

Locknuts

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

Description

Technical

Brass – 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 – A cost effective alternative to brass locknuts and should be used only in dry, low humidity conditions.

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

Stainless Steel – 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.

Product Table

Metric

Metric Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Across Flats Dimension “B” Across Corners Diameter “C” NPT Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Thickness Across Flats Dimension “B” Across Corners Diameter “C”
16LN M16 X 1.5 3.2 22.0 25.4 050NPTLN 1/2″ NPT 4.8 27.0 31.2
16HLN M16 X 1.5 5.0  22.0 25.4 075NPTLN 3/4″ NPT 4.8 33.0 38.1
20LN M20 X 1.5 3.2 24.0 27.7 100NPTLN 1″ NPT 4.8 41.0 47.3
20HLN M20 X 1.5 5.0 24.0 27.7 125NPTLN 1 1/4″ NPT 4.8 50.0 57.7
25LN M25 X 1.5 3.2 30.0 34.6 150NPTLN 1 1/2″ NPT 5.0 60.0 69.3
25HLN M25 X 1.5 5.0  30.0 34.6 200NPTLN 2″ NPT 5.0 75.0 88.6
32LN M32 X 1.5 3.2 36.0 41.6 250NPTLN 2 1/2″ NPT 10.0 84.0 97.0
32HLN M32 X 1.5 5.0 36.0 41.6 300NPTLN 3″ NPT 10.0 100.0 115.5
40LN M40 X 1.5 4.8 46.0 53.1 350NPTLN 3 1/2″ NPT 11.2 114.3 132.0
50LN M50 X 1.5 6.3 55.0 63.5
63LN M63 X 1.5 6.3 70.0 80.8
75LN M75 X 1.5 6.3 84.0 97.0
90LN M90 X 2.0 9.5 106.0 122.4
100LN M100 X 2.0 9.5 123.0 142.0
All dimensions shown are in millimetres unless otherwise stated

Imperial

Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Across Flats Dimension “B” Across Corners Diameter “C” Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Thickness Across Flats Dimension “B” Across Corners Diameter “C”
16LN M16 X 1.5 0.126 0.866 1.000 050NPTLN 1/2″ NPT 0.189 1.063 1.228
16HLN M16 X 1.5 0.197 0.866 1.000 075NPTLN 3/4″ NPT 0.189 1.299 1.500
20LN M20 X 1.5 0.126 0.945 1.091 100NPTLN 1″ NPT 0.189 1.614 1.862
20HLN M20 X 1.5 0.197 0.945 1.091 125NPTLN 1 1/4″ NPT 0.189 1.969 2.272
25LN M25 X 1.5 0.126 1.181 1.362 150NPTLN 1 1/2″ NPT 0.197 2.362 2.728
25HLN M25 X 1.5 0.197 1.181 1.362 200NPTLN 2″ NPT 0.197 2.953 3.488
32LN M32 X 1.5 0.126 1.417 1.638 250NPTLN 2 1/2″ NPT 0.394 3.307 3.819
32HLN M32 X 1.5 0.197 1.417 1.638 300NPTLN 3″ NPT 0.394 3.937 4.547
40LN M40 X 1.5 0.189 1.811 2.091 350NPTLN 3 1/2″ NPT 0.441 4.500 5.197
50LN M50 X 1.5 0.248 2.165 2.500
63LN M63 X 1.5 0.248 2.756 3.181
75LN M75 X 1.5 0.248 3.307 3.819
90LN M90 X 2.0 0.374 4.173 4.819
100LN M100 X 2.0 0.374 4.843 5.591
All dimensions shown are in inches unless otherwise stated

Download Spec Sheet

Download

Technical

Brass – 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 – A cost effective alternative to brass locknuts and should be used only in dry, low humidity conditions.

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

Stainless Steel – 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.

Product Table

Metric

Metric Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Across Flats Dimension “B” Across Corners Diameter “C” NPT Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Thickness Across Flats Dimension “B” Across Corners Diameter “C”
16LN M16 X 1.5 3.2 22.0 25.4 050NPTLN 1/2″ NPT 4.8 27.0 31.2
16HLN M16 X 1.5 5.0  22.0 25.4 075NPTLN 3/4″ NPT 4.8 33.0 38.1
20LN M20 X 1.5 3.2 24.0 27.7 100NPTLN 1″ NPT 4.8 41.0 47.3
20HLN M20 X 1.5 5.0 24.0 27.7 125NPTLN 1 1/4″ NPT 4.8 50.0 57.7
25LN M25 X 1.5 3.2 30.0 34.6 150NPTLN 1 1/2″ NPT 5.0 60.0 69.3
25HLN M25 X 1.5 5.0  30.0 34.6 200NPTLN 2″ NPT 5.0 75.0 88.6
32LN M32 X 1.5 3.2 36.0 41.6 250NPTLN 2 1/2″ NPT 10.0 84.0 97.0
32HLN M32 X 1.5 5.0 36.0 41.6 300NPTLN 3″ NPT 10.0 100.0 115.5
40LN M40 X 1.5 4.8 46.0 53.1 350NPTLN 3 1/2″ NPT 11.2 114.3 132.0
50LN M50 X 1.5 6.3 55.0 63.5
63LN M63 X 1.5 6.3 70.0 80.8
75LN M75 X 1.5 6.3 84.0 97.0
90LN M90 X 2.0 9.5 106.0 122.4
100LN M100 X 2.0 9.5 123.0 142.0
All dimensions shown are in millimetres unless otherwise stated

Imperial

Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Across Flats Dimension “B” Across Corners Diameter “C” Ordering Reference (Brass) Thread Diameter “A” Minimum Thickness Thickness Across Flats Dimension “B” Across Corners Diameter “C”
16LN M16 X 1.5 0.126 0.866 1.000 050NPTLN 1/2″ NPT 0.189 1.063 1.228
16HLN M16 X 1.5 0.197 0.866 1.000 075NPTLN 3/4″ NPT 0.189 1.299 1.500
20LN M20 X 1.5 0.126 0.945 1.091 100NPTLN 1″ NPT 0.189 1.614 1.862
20HLN M20 X 1.5 0.197 0.945 1.091 125NPTLN 1 1/4″ NPT 0.189 1.969 2.272
25LN M25 X 1.5 0.126 1.181 1.362 150NPTLN 1 1/2″ NPT 0.197 2.362 2.728
25HLN M25 X 1.5 0.197 1.181 1.362 200NPTLN 2″ NPT 0.197 2.953 3.488
32LN M32 X 1.5 0.126 1.417 1.638 250NPTLN 2 1/2″ NPT 0.394 3.307 3.819
32HLN M32 X 1.5 0.197 1.417 1.638 300NPTLN 3″ NPT 0.394 3.937 4.547
40LN M40 X 1.5 0.189 1.811 2.091 350NPTLN 3 1/2″ NPT 0.441 4.500 5.197
50LN M50 X 1.5 0.248 2.165 2.500
63LN M63 X 1.5 0.248 2.756 3.181
75LN M75 X 1.5 0.248 3.307 3.819
90LN M90 X 2.0 0.374 4.173 4.819
100LN M100 X 2.0 0.374 4.843 5.591
All dimensions shown are in inches unless otherwise stated