Brand: Cortem

Cortem NAVB Ex Barrier Cable Glands for Non-Armoured Cable

Name: Cortem NAVB Ex Barrier Cable Glands – Datasheet & Quote
Brand: Cortem
SKU: NAVB

Description

Barrier cable glands for non-armoured cable, 3/8 inch to 4 inch

The Cortem NAVB series are barrier cable glands for non-armoured cable that provide IP66/67 protection and the explosion protection Ex db IIC and Ex eb IIC where installation under EN IEC 60079-14 requires a sealed barrier. A liquid two-component resin flows around the conductors in a special bushing and fills the space completely. Cortem states that the liquid resin prevents the air pockets and voids that malleable resins can leave between the conductors and the bushing. The resin kit is ordered separately.

Glands are offered from 3/8 inch NPT to 4 inch NPT, and in ISO metric threads from M16x1.5 to M115x1.5, in nickel-plated brass. AISI 316 stainless steel (example code NAVB1S) and the ISO 7-1 thread version are available on request, and a blue RAL 5015 nut marks the Ex i intrinsic safety version.

Technical specifications of the NAVB series

Parameter	Specification
Manufacturer	Cortem S.p.A., Italy (Elfit brand site for certificates)
Classification	Group II, category 2GD/3G; Zones 1, 2, 21, 22
Marking	II 2 GD Ex db IIC Gb, Ex eb IIC Gb; II 2 D Ex tb IIIC Db; II 3G Ex nR IIC Gc
Certificates	ATEX IMQ 19 ATEX 019X (category 2); IMQ 19 ATEX 020X (category 3); IECEx IMQ 19.0003X; TR CU available
Operating temperature	-60 to +100 °C
Protection	IP66/67
Cable type	Non-armoured
Material	Nickel-plated brass (stainless steel 316 on request)
Seals	Silicone O-rings supplied on ISO metric threads
Design standards	BS 6121 Part 1:1989, IEC 62444, EN 62444; EN 60079-0, -1, -7, -15, -31

Selection table

Pairs of NPT and ISO metric codes are shown with the maximum cable diameter and the maximum diameter over cores in millimetres, as printed. Weight is in kilograms and resin is the maximum quantity in millilitres for a fully empty bushing; at least 20 percent of the bushing internal section must be filled with resin.

NPT code	NPT thread	ISO code	Cable / cores max (mm)	Weight (kg)	Resin (ml)
NAVB01NB	3/8″ NPT	NAVB16IB M16x1.5	7.1 / 5.5	0.094	1.3
NAVB1SNB	1/2″ NPT	NAVB20SIB M20x1.5	11.6 / 10	0.093	3.7
NAVB1NB	1/2″ NPT	NAVB20IB M20x1.5	13.2 / 11	0.126	4.2
NAVB2NB	3/4″ NPT	NAVB25IB M25x1.5	18.6 / 15	0.153	8.3
NAVB3NB	1″ NPT	NAVB32IB M32x1.5	25 / 21	0.232	15
NAVB4NB	1 1/4″ NPT	NAVB40IB M40x1.5	31.8 / 27	0.295	24
NAVB5SNB	1 1/2″ NPT	NAVB50SIB M50x1.5	38 / 33	0.374	36
NAVB5NB	2″ NPT	NAVB50IB M50x1.5	42 / 35	0.329	41
NAVB6SNB	2″ NPT	NAVB63SIB M63x1.5	50 / 43	0.753	65
NAVB6NB	2 1/2″ NPT	NAVB63IB M63x1.5	54 / 45	0.732	70
NAVB7SNB	2 1/2″ NPT	NAVB75SIB M75x1.5	62 / 53	0.714	98
NAVB7NB	3″ NPT	NAVB75IB M75x1.5	65 / 55	0.627	101

Larger sizes NAVB8NB (M90), NAVB9NB (M100) and NAVB10NB (M115, 4 inch NPT) continue the range up to 98 mm over cores and 254 ml of resin.

Resin kits, accessories and what to confirm

Order the resin kit with the gland: BOND-B-25 (25 ml bag), BOND-B-100 (100 ml bag) or BOND-C (40 ml cartridge with mixing nozzle), with an optional manual dispenser DISP-C. Locknuts (DL series), earthing rings (A series), reducers, lock washers, PGA protectors and heat-shrink GTR7 sleeves are listed as accessories. Confirm the thread type (NPT, ISO metric or ISO 7-1), the cable diameter and the diameter over cores, the zone and category, the material, and the amount of resin needed. For armoured cable Cortem lists the equivalent NEVB series.

Documents and quotation

The attached document is the Cortem NAVB barrier cable glands datasheet (catalogue pages 28-29, edition 2026).

For a quotation, send the model code, voltage, zone and gas or dust group, cable entry details and quantity. See Electrical Tapes & Cable Accessories for related hazardous-area equipment.

Datasheets & Documents

Datasheet Cortem NAVB barrier cable glands datasheet (ED.2026) Download

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About brand

Cortem is the Italian maker of explosion-proof and increased-safety electrical equipment: Ex d and Ex e lighting, enclosures, control stations, plugs and sockets, cable glands and signalling devices. Marco Rossi and Renato Gratton founded the company on 24 February 1968 in Villesse, in the Friuli Venezia Giulia region of north-east Italy. Cortem S.p.A. heads the Cortem Group, which also includes Elfit and the Fondisonzo foundry, and supplies onshore and offshore oil and gas, chemical and industrial plants.

Seven Star LLC is an independent supplier in Muscat. We list Cortem junction boxes, lighting, plugs and sockets and control stations for oil and gas and process projects in Oman and the GCC.

Cortem company profile

Founded	24 February 1968, Villesse (Gorizia), Italy
Founders	Marco Rossi and Renato Gratton
Name	From the Italian for electromechanical construction and technical representation
Group companies	Cortem S.p.A., Elfit and Fondisonzo
Approvals	ATEX and IECEx certified explosion-protected equipment
Product families	Ex d and Ex e luminaires and LED fittings, emergency and exit lights, obstruction lights, junction and control boxes, control stations, plugs and sockets, cable glands, alarm and signalling devices

Milestones

1968: Marco Rossi and Renato Gratton found Cortem in Villesse on 24 February.
2011: Research and development on LED lighting for hazardous areas begins.
2012: The first Cortem LED fixture series is launched.
2022: The third generation of Cortem LED fixtures is released.

Cortem product series

Enclosures include the EJBX stainless steel Ex d junction boxes, EJBC aluminium Ex d boxes for gas group IIC, the SA and SAG Ex eb aluminium boxes in 18 sizes and the EJBE and EJBXE Ex de control and distribution boards. Control and power connection products include the CMD Ex e fibreglass control stations and the PYN, SPYN and CMBSP07 Ex plugs and sockets from 16 to 125 A.

Lighting covers the SLED-ME and EVL-40 Ex LED floodlights, the Ex nR SLED-MN and EVNL-40 floodlights for zone 2, the LIFEX-M linear fixture, the FLOWEX high bay, the EVML low bay, STREETEX street lighting and the XLFE-LIB and XLFE-MIA obstruction lights for stacks and towers. The GRDE-4200 is an electronic earthing system for road tanker loading bays.

Where Cortem equipment is used

Refineries, gas plants, tank farms and loading terminals, offshore platforms and ships, chemical and pharmaceutical plants and mining. Products are certified to ATEX and IECEx, with other schemes according to model.

Cortem products we list

Family	Examples
Automation Accessories	CMBSP07 Ex GRP Plugs and Sockets 16 A to 125 A, CMD Ex e Fibreglass Control and Signalling, EJBC Aluminium Ex d Junction Boxes for Gas, EJBE-EJBXE Ex de Control and Distribution, EJBX Stainless Steel Ex d Junction Box IIB+H2, EV Ex d Luminaires for Traditional and LED, EVL-40 Ex LED Floodlight with 40 Degree Beam, EVML Ex LED Low Bay Luminaire and 14 more

Ordering Cortem products: what we need

Send the model code, the zone and gas or dust group, temperature class, ingress protection, the certification scheme required, and for enclosures the size, entries and internal components. For lighting give the wattage, voltage and mounting; for plugs and sockets the current, poles and voltage.

Facts checked against Cortem Group's published company history, October 2026.

Browse Cortem products by category: Automation Accessories.