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Earthing / Grounding Locknuts Accessories for cable glands, available in brass, stainless steel, aluminum and nickel plated brass

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
C441404Grounding and Bonding Devices
C441484Grounding and Bonding Devices - Certified to US Standards
C909801Miscellaneous - For Hazardous Locations
C909881Miscellaneous - For Hazardous Locations - Certified to US Standards
cCSAus Certificate2450309
Code of ProtectionClass I Zone 1 AExe II, Exe II

Grounding Locknuts with Grounding Terminal / Lay-in Lug

GROUNDING LOCKNUTS WITH GROUNDING TERMINAL
ORDERING REFERENCE WITH GROUNDING TERMINAL THREAD DIAMETER METRIC MINIMUM THICKNESS ACROSS FLATS DIMENSION ACROSS CORNERS DIAMETER
STANDARD NICKEL PLATED BRASS OPTIONAL STAINLESS STEEL OPTIONAL ALUMINUM
20GRLN520GRLN420GRLN1M200.481.21.32
25GRLN525GRLN425GRLN1M250.481.481.63
32GRLN532GRLN432GRLN1M320.481.811.99
40GRLN540GRLN440GRLN1M400.482.052.25
50GRLN550GRLN450GRLN1M500.482.362.6
63GRLN563GRLN463GRLN1M630.482.763.03
75GRLN575GRLN475GRLN1M750.483.543.9
90GRLN590GRLN490GRLN1M900.484.334.76
100GRLN5100GRLN4100GRLN1M1000.484.845.33
115GRLN5115GRLN4115GRLN1M1150.485.245.76
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.
GROUNDING LOCKNUTS WITH GROUNDING TERMINAL
ORDERING REFERENCE WITH GROUNDING TERMINAL THREAD DIAMETER METRIC MINIMUM THICKNESS ACROSS FLATS DIMENSION ACROSS CORNERS DIAMETER
STANDARD NICKEL PLATED BRASS OPTIONAL STAINLESS STEEL OPTIONAL ALUMINUM
050NPTGRLN5050NPTGRLN4050NPTGRLN11/2"0.481.21.32
075NPTGRLN5075NPTGRLN4075NPTGRLN13/4"0.481.481.63
100NPTGRLN5100NPTGRLN4100NPTGRLN11"0.481.811.99
125NPTGRLN5125NPTGRLN4125NPTGRLN11 1/4"0.482.052.25
150NPTGRLN5150NPTGRLN4150NPTGRLN11 1/2"0.482.362.6
200NPTGRLN5200NPTGRLN4200NPTGRLN12"0.482.763.03
250NPTGRLN5250NPTGRLN4250NPTGRLN12 1/2"0.483.543.9
300NPTGRLN5300NPTGRLN4300NPTGRLN13"0.484.334.76
350NPTGRLN5350NPTGRLN4350NPTGRLN13 1/2"0.484.845.33
400NPTGRLN5400NPTGRLN4400NPTGRLN14"0.485.245.76
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.
GROUNDING LOCKNUTS WITH LAY-IN LUG
ORDERING REFERENCE WITH ANGLED LAY-IN LUG ORDERING REFERENCE WITH STRAIGHT LAY-IN LUG THREAD DIAMETER NPT MINIMUM LOCKNUT THICKNESS 14-4 &14-2/0 LUG MINIMUM LOCKNUT THICKNESS 6-250 LUG ACROSS FLATS DIMENSIONS ACROSS CORNERS DIAMETER
STANDARD 14-4 AWG OPTIONAL 14-2/0 AWG OPTIONAL 6-250 AWG*
ALUMINIUM NICKEL PLATED BRASS ALUMINUM NICKEL PLATED BRASS ALUMINIUM NICKEL PLATED BRASS
20GRLN1-4A20GRLN5-4AM200.481.21.32
25GRLN1-4A25GRLN5-4AM250.481.481.63
32GRLN1-4A32GRLN5-4A32GRLN1-10A32GRLN5-10AM320.481.811.99
40GRLN1-4A40GRLN5-4A40GRLN1-10A40GRLN5-10AM400.482.052.25
50GRLN1-4A50GRLN5-4A50GRLN1-10A50GRLN5-10AM500.482.362.6
63GRLN1-4A63GRLN5-4A63GRLN1-10A63GRLN5-10AM630.482.763.03
75GRLN1-4A75GRLN5-4A75GRLN1-10A75GRLN5-10A75GRLN1-2575GRLN5-25M750.480.683.543.9
90GRLN1-4A90GRLN5-4A90GRLN1-10A90GRLN5-10A90GRLN1-2590GRLN5-25M900.480.684.334.76
100GRLN1-4A100GRLN5-4A100GRLN1-10A100GRLN5-10A100GRLN1-25100GRLN5-25M1000.480.684.845.33
115GRLN1-4A115GRLN5-4A115GRLN1-10A115GRLN5-10A115GRLN1-25115GRLN5-25M1150.480.685.245.76
Dimensions shown are in inches unless otherwise stated
* Grounding Locknuts with Lay-in-Lug are available in aluminum, nickel plated brass & stainless steel (not shown). 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.
GROUNDING LOCKNUTS WITH LAY-IN LUG
ORDERING REFERENCE WITH ANGLED LAY-IN LUG ORDERING REFERENCE WITH STRAIGHT LAY-IN LUG THREAD DIAMETER NPT MINIMUM LOCKNUT THICKNESS 14-4 &14-2/0 LUG MINIMUM LOCKNUT THICKNESS 6-250 LUG ACROSS FLATS DIMENSIONS ACROSS CORNERS DIAMETER
STANDARD 14-4 AWG OPTIONAL 14-2/0 AWG OPTIONAL 6-250 AWG*
ALUMINIUM NICKEL PLATED BRASS ALUMINUM NICKEL PLATED BRASS ALUMINIUM NICKEL PLATED BRASS
050NPTGRLN1-4A050NPTGRLN5-4A1/2"0.481.21.32
075NPTGRLN1-4A075NPTGRLN5-4A3/4"0.481.481.63
100NPTGRLN1-4A100NPTGRLN5-4A100NPTGRLN1-10A100NPTGRLN5-10A1"0.481.811.99
125NPTGRLN1-4A125NPTGRLN5-4A125NPTGRLN1-10A125NPTGRLN5-10A1 1/4"0.482.052.25
150NPTGRLN1-4A150NPTGRLN5-4A150NPTGRLN1-10A150NPTGRLN5-10A1 1/2"0.482.362.6
200NPTGRLN1-4A200NPTGRLN5-4A200NPTGRLN1-10A200NPTGRLN5-10A2"0.482.763.03
250NPTGRLN1-4A250NPTGRLN5-4A250NPTGRLN1-10A250NPTGRLN5-10A250NPTGRLN1-25250NPTGRLN5-252 1/2"0.480.683.543.9
300NPTGRLN1-4A300NPTGRLN5-4A300NPTGRLN1-10A300NPTGRLN5-10A300NPTGRLN1-25300NPTGRLN5-253"0.480.684.334.76
350NPTGRLN1-4A350NPTGRLN5-4A350NPTGRLN1-10A350NPTGRLN5-10A350NPTGRLN1-25350NPTGRLN5-253 1/2"0.480.684.845.33
400NPTGRLN1-4A400NPTGRLN5-4A400NPTGRLN1-10A400NPTGRLN5-10A400NPTGRLN1-25400NPTGRLN5-254"0.480.685.245.76
Dimensions shown are in inches unless otherwise stated
* Grounding Locknuts with Lay-in-Lug are available in aluminum, nickel plated brass & stainless steel (not shown). 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.