Products > Earthing / Grounding Locknuts

Earthing / Grounding Locknuts

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

Description

Technical

CMP Products’ Grounding locknuts for use with cable glands, conduit fittings, tubing (EMT) fittings and conduit as a means of reliably and safely bonding the locknut (and gland) to the enclosure or equipment.

Providing electrical continuity and tested to the requirements of CEC and NEC wiring codes CMP’s grounding locknuts reduce the chance of equipment failure, downtime, power interruptions and eliminate potential safety issues.

Grounding locknuts are available certified with either an Ex ‘e’ grounding terminal or lay-in lug and are available in stainless steel (GRLN4), aluminum (GRLN1) and nickel plated brass (GRLN5), e.g 20GRLN4 for M20 Stainless Steel Grounding Locknut with grounding terminal

NPT grounding locknuts are supplied as standard in aluminum and Metric in nickel plated brass.

Standard – Small Lay-in Lug – 14-4 AWG
Optional – Medium Lay-in Lug – 14-2/0 AWG
Optional – Large Lay-in Lug – 6-250 AWG

AWG – American wire gauge

CLASS Catagories
C441404 Grounding and Bonding Devices
C441484 Grounding and Bonding Devices – Certified to US Standards
C909801 Miscellaneous – For Hazardous Locations
C909881 Miscellaneous – For Hazardous Locations – Certified to US Standards

cCSAus Certificate 2450309
Code of Protection Class I Zone 1 AExe II, Exe II

Product Table

Metric

Ordering Reference
with Grounding Terminal
Thread
Diameter
Metric
Minimum Thickness Across Flats
Dimension
Across Corners
Diameter
Standard Nickel Plated Brass Optional Stainless Steel
20GRLN5 20GRLN4 M20 0.48 1.20 1.32
25GRLN5 25GRLN4 M25 0.48 1.48 1.63
32GRLN5 32GRLN4 M32 0.48 1.81 1.99
40GRLN5 40GRLN4 M40 0.48 2.05 2.25
50GRLN5 50GRLN4 M50 0.48 2.36 2.60
63GRLN5 63GRLN4 M63 0.48 2.76 3.03
75GRLN5 75GRLN4 M75 0.48 3.54 3.90
90GRLN5 90GRLN4 M90 0.48 4.33 4.76
100GRLN5 100GRLN4 M100 0.48 4.84 5.33
115GRLN5 115GRLN4 M115 0.48 5.24 5.76
Dimensions shown are in inches unless otherwise stated
Grounding Terminal will always be Stainless Steel regardless of locknut material
Grounding Terminal is suitable for wire sizes 0.5mm2 to 2.5mm2

Imperial

Ordering Reference
Aluminum with Angled Lay-in Lug
Thread Diameter
NPT
Minimum Thickness
14-4 & 14-2/0
Lug
Minimum Thickness
6-250
Lug
Across Flats
Dimension
Across Corners
Diameter
Standard 14-4 AWG Optional 14-2/0 AWG Optional 6-250 AWG*
050NPTGRLN1-4A 1/2″NPT 0.48 1.20 1.32
075NPTGRLN1-4A 3/4″NPT 0.48 1.48 1.63
100NPTGRLN1-4A 100NPTGRLN1-10A 1″NPT 0.48 1.81 1.99
125NPTGRLN1-4A 125NPTGRLN1-10A 1 1/4″NPT 0.48 2.05 2.25
150NPTGRLN1-4A 150NPTGRLN1-10A 1 1/2″NPT 0.48 2.36 2.60
200NPTGRLN1-4A 200NPTGRLN1-10A 2″NPT 0.48 2.76 3.03
250NPTGRLN1-4A 250NPTGRLN1-10A 250NPTGRLN1-25 2 1/2″NPT 0.48 0.68 3.54 3.90
300NPTGRLN1-4A 300NPTGRLN1-10A 300NPTGRLN1-25 3″NPT 0.48 0.68 4.33 4.76
350NPTGRLN1-4A 350NPTGRLN1-10A 350NPTGRLN1-25 3 1/2″NPT 0.48 0.68 4.84 5.33
400NPTGRLN1-4A 400NPTGRLN1-10A 400NPTGRLN1-25 4″NPT 0.48 0.68 5.24 5.76
Dimensions shown are in inches unless otherwise stated
Grounding Locknuts with Lay-in-Lug are available in Nickel Plated Brass & Stainless Steel.
Lay-in-Lug will always be Aluminum regardless of locknut material.
Lay-in-Lug may be angled or straight design, remove ‘A’ suffix from order reference for straight design.
*Only the straight lay-in-lug design is available for 6-250 AWG.

Download Spec Sheet

Download

Technical

CMP Products’ Grounding locknuts for use with cable glands, conduit fittings, tubing (EMT) fittings and conduit as a means of reliably and safely bonding the locknut (and gland) to the enclosure or equipment.

Providing electrical continuity and tested to the requirements of CEC and NEC wiring codes CMP’s grounding locknuts reduce the chance of equipment failure, downtime, power interruptions and eliminate potential safety issues.

Grounding locknuts are available certified with either an Ex ‘e’ grounding terminal or lay-in lug and are available in stainless steel (GRLN4), aluminum (GRLN1) and nickel plated brass (GRLN5), e.g 20GRLN4 for M20 Stainless Steel Grounding Locknut with grounding terminal

NPT grounding locknuts are supplied as standard in aluminum and Metric in nickel plated brass.

Standard – Small Lay-in Lug – 14-4 AWG
Optional – Medium Lay-in Lug – 14-2/0 AWG
Optional – Large Lay-in Lug – 6-250 AWG

AWG – American wire gauge

CLASS Catagories
C441404 Grounding and Bonding Devices
C441484 Grounding and Bonding Devices – Certified to US Standards
C909801 Miscellaneous – For Hazardous Locations
C909881 Miscellaneous – For Hazardous Locations – Certified to US Standards

cCSAus Certificate 2450309
Code of Protection Class I Zone 1 AExe II, Exe II

Product Table

Metric

Ordering Reference
with Grounding Terminal
Thread
Diameter
Metric
Minimum Thickness Across Flats
Dimension
Across Corners
Diameter
Standard Nickel Plated Brass Optional Stainless Steel
20GRLN5 20GRLN4 M20 0.48 1.20 1.32
25GRLN5 25GRLN4 M25 0.48 1.48 1.63
32GRLN5 32GRLN4 M32 0.48 1.81 1.99
40GRLN5 40GRLN4 M40 0.48 2.05 2.25
50GRLN5 50GRLN4 M50 0.48 2.36 2.60
63GRLN5 63GRLN4 M63 0.48 2.76 3.03
75GRLN5 75GRLN4 M75 0.48 3.54 3.90
90GRLN5 90GRLN4 M90 0.48 4.33 4.76
100GRLN5 100GRLN4 M100 0.48 4.84 5.33
115GRLN5 115GRLN4 M115 0.48 5.24 5.76
Dimensions shown are in inches unless otherwise stated
Grounding Terminal will always be Stainless Steel regardless of locknut material
Grounding Terminal is suitable for wire sizes 0.5mm2 to 2.5mm2

Imperial

Ordering Reference
Aluminum with Angled Lay-in Lug
Thread Diameter
NPT
Minimum Thickness
14-4 & 14-2/0
Lug
Minimum Thickness
6-250
Lug
Across Flats
Dimension
Across Corners
Diameter
Standard 14-4 AWG Optional 14-2/0 AWG Optional 6-250 AWG*
050NPTGRLN1-4A 1/2″NPT 0.48 1.20 1.32
075NPTGRLN1-4A 3/4″NPT 0.48 1.48 1.63
100NPTGRLN1-4A 100NPTGRLN1-10A 1″NPT 0.48 1.81 1.99
125NPTGRLN1-4A 125NPTGRLN1-10A 1 1/4″NPT 0.48 2.05 2.25
150NPTGRLN1-4A 150NPTGRLN1-10A 1 1/2″NPT 0.48 2.36 2.60
200NPTGRLN1-4A 200NPTGRLN1-10A 2″NPT 0.48 2.76 3.03
250NPTGRLN1-4A 250NPTGRLN1-10A 250NPTGRLN1-25 2 1/2″NPT 0.48 0.68 3.54 3.90
300NPTGRLN1-4A 300NPTGRLN1-10A 300NPTGRLN1-25 3″NPT 0.48 0.68 4.33 4.76
350NPTGRLN1-4A 350NPTGRLN1-10A 350NPTGRLN1-25 3 1/2″NPT 0.48 0.68 4.84 5.33
400NPTGRLN1-4A 400NPTGRLN1-10A 400NPTGRLN1-25 4″NPT 0.48 0.68 5.24 5.76
Dimensions shown are in inches unless otherwise stated
Grounding Locknuts with Lay-in-Lug are available in Nickel Plated Brass & Stainless Steel.
Lay-in-Lug will always be Aluminum regardless of locknut material.
Lay-in-Lug may be angled or straight design, remove ‘A’ suffix from order reference for straight design.
*Only the straight lay-in-lug design is available for 6-250 AWG.