Product Search

Search

Search the full site including products, accessories, news posts & pages.

Product Finder

Our Product Finder tool allows you to find the perfect product for your requirements.

Cleat Specification Tool

Helping you find the right cleat for your application.

EN-US EN-GB RU CN

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

We'd like to keep in touch

We have some exciting things in the pipeline - if you'd like to be the first to know please enter your email address below.

Oops! We could not locate your form.

No thanks, I'd just like to Download the datasheet.

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 with either a 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.

NPT grounding locknuts are supplied as standard in aluminum and Metric in nickel plated brass. Hammer and screwdriver  installation grooves only on aluminium design (as pictured).

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

Grounding Locknuts with Grounding Terminal / Lay-in Lug

NPT
Ordering Reference Aluminium with Angled Lay-in LugThread Diameter NPTMinimum Locknut Thickness 14-4 & 14-2/0 LugMinimum Locknut Thickness 6-250 LugAcross Flats DimensionAcross Corners Diameter
Standard 14-4 AWGOptional 14-2/0 AWGOptional 6-250 AWG*
050NPTGRLN1-4A--½"0.481.201.32
075NPTGRLN1-4A--¾"0.481.481.63
100NPTGRLN1-4A100NPTGRLN110A-1"0.481.811.99
125NPTGRLN1-4A125NPTGRLN110A-1 ¼"0.482.052.25
150NPTGRLN1-4A150NPTGRLN110A-1 ½"0.482.362.60
200NPTGRLN1-4A200NPTGRLN110A-2"0.482.763.03
250NPTGRLN1-4A250NPTGRLN110A250NPTGRLN1252 ½"0.480.683.543.90
300NPTGRLN1-4A300NPTGRLN110A300NPTGRLN1253"0.480.684.334.76
350NPTGRLN1-4A350NPTGRLN110A350NPTGRLN1253 ½"0.480.684.845.33
400NPTGRLN1-4A400NPTGRLN110A400NPTGRLN1254"0.480.685.245.76
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
Metric
Ordering Reference with Grounding TerminalThread Diametere MetricMinimum ThicknessAcross Flats DimensionAcross Corners Dimension
Standard Nickel Plated BrassOptional Stainless Steel
20GRLN520GRLN4M200.481.201.32
25GRLN525GRLN4M250.481.481.63
32GRLN532GRLN4M320.481.811.99
40GRLN540GRLN4M400.482.052.25
50GRLN550GRLN4M500.482.362.6
63GRLN563GRLN4M630.482.763.03
75GRLN575GRLN4M750.483.543.9
90GRLN590GRLN4M900.484.334.76
100GRLN5100GRLN4M1000.484.845.33
115GRLN5115GRLN4M1150.485.245.76
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