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Brand: Hawke International
Hawke 501/421 Ex d / Ex e Cable Gland for Unarmoured Cable
Description
Overview
Hawke 501/421 is a Group II certified single seal cable gland from Hawke International for non-armoured (unarmoured) elastomer and plastic insulated cables. It is suitable for installation in Zone 1, Zone 21, Zone 2 and Zone 22 hazardous areas and is certified for the flameproof (Ex d) and increased safety (Ex e) protection concepts, and also for restricted breathing (Ex nR) and dust protection (Ex t). The gland has no armour clamp. It seals on the outer sheath of the cable with one elastomeric compression seal.
Hawke also states that the 501/421 may be used with braided cables where the braid and the outer sheath pass through the gland into the enclosure, provided the requirements of IEC 60079-14 are met. Seven Star LLC supplies the Hawke 501/421 cable gland on request to EPC contractors, plant engineers and instrumentation teams in Oman and the wider GCC, with lead time confirmed at quotation.
Operating Principle
The Hawke 501/421 is a compression gland. When the gland is tightened, a single elastomeric seal is compressed onto the outer sheath of the cable. This one seal is the certified Ex d seal of the gland and it also provides the ingress protection at the cable entry. Because the cable has no armour, there is no armour termination and no inner seal: the gland has one sealing point, on the outer sheath.
The same seal gives the gland its cable retention. The 501/421 is tested to IEC/EN 62444 with anchorage Type B. The cable entry of the gland is rounded, which helps to prevent damage to the cable sheath where the cable enters the gland.
Engineering Design of the Hawke 501/421
The Hawke 501/421 is made in brass, nickel-plated brass or 316L stainless steel. It is available with metric or NPT entry threadforms, so it can be matched to the threaded entries of the enclosure. The stated operating temperature range is -60°C to +100°C.
Ingress protection is IP66, IP67 and IP68 to IEC/EN 60529. The IP68 rating is 30 metres for 7 days, and Hawke notes that special instructions apply to it. The gland is also rated NEMA 4X, has deluge protection to DTS01 and an impact rating of IK10 to IEC 62262. The hazardous area markings published by Hawke are Ex db eb IIC Gb, Ex nR IIC Gc and Ex tb IIIC Db. Gland size must be selected from the Hawke datasheet according to the cable outer diameter and the entry thread.
Key Features
The main points of the Hawke 501/421, as published by the manufacturer:
- Single seal gland for non-armoured elastomer and plastic insulated cables.
- Certified for flameproof (Ex d) and increased safety (Ex e), and also Ex nR and Ex t.
- For Zone 1, Zone 21, Zone 2 and Zone 22 hazardous areas.
- Single elastomeric compression Ex d seal on the cable outer sheath.
- Rounded cable entry to help prevent cable damage.
- IP66, IP67 and IP68 (30 metres for 7 days, special instructions apply), NEMA 4X, deluge protection to DTS01.
- Brass, nickel-plated brass or 316L stainless steel.
- Metric or NPT entry threadforms.
- Operating temperature -60°C to +100°C.
Industrial Applications
The Hawke 501/421 is used where unarmoured cables enter Ex d or Ex e equipment in gas and dust hazardous areas, for example junction boxes, control stations, instruments, lighting and motor terminal boxes. Typical sites are oil and gas production and processing plants, refineries, petrochemical plants and other installations classified as Zone 1, Zone 2, Zone 21 or Zone 22.
It is not a gland for steel wire armoured or steel tape armoured cable, because it has no armour clamp. For those cables an armoured cable gland from the Hawke range is required. Selection of a gland for a flameproof enclosure must also follow the cable and enclosure rules of IEC 60079-14 and the installation instructions of the manufacturer. Seven Star LLC supplies the 501/421 on request for projects in Oman and the GCC.
Technical Specifications
Key parameters for the Hawke 501/421 Ex d / Ex e cable gland for unarmoured cable:
| Parameter | Specification |
|---|---|
| Model | Hawke 501/421 |
| Gland type | Group II single seal compression gland |
| Cable type | Non-armoured elastomer and plastic insulated cables; braided cables where braid and outer sheath pass into the enclosure (IEC 60079-14) |
| Protection concepts | Ex d (flameproof), Ex e (increased safety), Ex nR, Ex t |
| Markings | Ex db eb IIC Gb; Ex nR IIC Gc; Ex tb IIIC Db |
| Hazardous areas | Zone 1, Zone 21, Zone 2, Zone 22 |
| Approvals | ATEX CML 19ATEX1167X, IECEx CML 19.0045X, UKEx, cCSAus, Inmetro and others |
| Ingress protection | IP66, IP67, IP68 (30 metres for 7 days, special instructions apply) to IEC/EN 60529; NEMA 4X |
| Deluge protection | DTS01 |
| Impact rating | IK10 to IEC 62262 |
| Sealing design | Single elastomeric compression seal on the cable outer sheath |
| Cable retention | IEC/EN 62444, anchorage Type B |
| Material | Brass, nickel-plated brass or 316L stainless steel |
| Entry thread | Metric or NPT |
| Operating temperature | -60°C to +100°C |
Request a Quote for Hawke 501/421 Ex d / Ex e Cable Gland for Unarmoured Cable
EPC contractors and plant engineers in Oman and the GCC can request a formal quotation for the Hawke 501/421 cable gland from Seven Star LLC. Please state the entry thread, the gland material, the cable outer diameter and the quantity. The gland is supplied on request, lead time confirmed at quotation, and the certification documents of the manufacturer can be requested with the quotation. Contact our sales team by phone or email.
Browse the full Hawke International range or see more Electrical & Power Modules products supplied by Seven Star LLC in Oman and the GCC.
Datasheets & Documents
- Datasheet Hawke 501/421 Cable Gland Datasheet Download
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About brand
Hawke International is a British maker of cable glands, enclosures and connectors for hazardous areas, based in Ashton-under-Lyne near Manchester. William Hawke made the first Hawke cable gland in the 1950s, and the company has manufactured in the Manchester area since 1957. Hubbell acquired Hawke in 2002.
Seven Star LLC lists the Hawke 501/421 cable gland for non-armored cable and sources Hawke cable glands and their accessories for electrical and instrument contractors and plant engineers in Oman and the GCC.
Hawke International company profile
| Manufacturing since | 1957, Manchester area |
|---|---|
| Location | Ashton-under-Lyne, UK |
| Ownership | Hubbell, since 2002 |
| Product families | 501 series Ex d / Ex e cable glands, ICG barrier glands, enclosures, connectors |
Milestones
- 1957: Hawke starts manufacturing cable glands.
- 2002: Hubbell acquires Hawke.
Hawke cable gland families
The numbers tell the types apart. The 501/421 is a single seal compression gland for non-armored elastomer and plastic insulated cables, and the manufacturer lists it as certified Ex d and Ex e for Zone 1 and Zone 2. The 501/453 Universal is the Ex d and Ex e gland for armored and braided cables, with a diaphragm seal for cables that show cold flow. The ICG 653 Universal is the barrier gland, sealed with compound around the individual cores. Bodies come in brass, nickel-plated brass or 316L stainless steel.
Ordering Hawke glands: what we need
Send the gland type, the entry thread (metric or NPT, with size), the cable's inner sheath and overall diameters, the armor type and wire or braid thickness, the gland material, and accessories such as locknut, earth tag, sealing washer and shroud.
Facts checked against Hawke and Hubbell published histories, October 2026.
Browse Hawke International products by category: Electrical & Power Modules.
FAQ
Questions about the Hawke 501/421 Ex d / Ex e Cable Gland for
Answers from our engineering team on installation, compatibility and integration.
01What type of cable is the Hawke 501/421 designed for?
The Hawke 501/421 is designed for non-armoured elastomer and plastic insulated cables. Hawke states it may also be used with braided cables where the braid and the outer sheath pass into the enclosure, provided the requirements of IEC 60079-14 are met. It has no armour clamp, so it is not a gland for wire armoured cable.
02How does the Hawke 501/421 seal on the cable?
It uses a single elastomeric compression seal that closes on the outer sheath of the cable when the gland is tightened. This seal is the certified Ex d seal of the gland. The cable entry is rounded to help prevent damage to the cable, and cable retention is tested to IEC/EN 62444, anchorage Type B.
03What thread types and materials is the Hawke 501/421 available in?
Hawke lists the 501/421 with metric or NPT entry threadforms and in three materials: brass, nickel-plated brass and 316L stainless steel. The gland size should be chosen from the Hawke datasheet according to the outer diameter of the cable and the threaded entry of the enclosure.
04Which hazardous areas and ingress ratings does the Hawke 501/421 cover?
It is a Group II gland for Zone 1, Zone 21, Zone 2 and Zone 22, certified Ex d, Ex e, Ex nR and Ex t under ATEX and IECEx among other schemes. Ingress protection is IP66, IP67 and IP68 (30 metres for 7 days, special instructions apply), with NEMA 4X and DTS01 deluge protection. Operating temperature is -60 to +100 C.
05Can Seven Star LLC supply the Hawke 501/421 in Oman and the GCC?
Yes. Seven Star LLC is an industrial supplier in Muscat that sources the Hawke 501/421 on request for customers in Oman and the GCC. Lead time is confirmed at quotation. To quote, we need the entry thread, the gland material, the cable outer diameter and the quantity required.
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