A Guide to Cable Gland Kits: What’s Included and Why

Cable gland kits group a gland with the parts supplied for a particular installation. The contents vary, so I recommend asking for the parts list before you order. Compare it with your cable and enclosure. That gives you a chance to spot a missing washer, locknut or other required part before work starts.

The word “kit” can sound reassuring. You might reasonably expect to open the bag and find everything you need. But one supplier may pack only the gland, while another includes the mounting accessories. Getting that difference clear early makes the rest of the job easier.

Key takeaways

• Ask whether the kit covers the gland, one complete enclosure entry, several entries or service spares.
• Check the parts list against your cable and mounting arrangement.
• Keep the gland’s internal parts together; select extra accessories for the job they actually do.
• Confirm any sealing, armour, electrical or hazardous-area requirement for the assembled entry.
• Calculate spares for each exact variant, then check and store every set with its label and instructions.

What is a cable gland kit?

A cable gland kit is a supplied group of parts for one or more cable entries. It can be a complete gland, a gland with mounting accessories, or a pack of repeated sets for a project. A service kit is different again: it contains replacement parts permitted for a particular product.

Start with the bill of materials, usually shortened to BOM. This is the list that identifies each supplied part and its quantity. You don’t need an elaborate document for a simple entry, but you do need enough detail to tell whether the bag matches the installation.

For quantity planning, define one installed kit as one named entry set with a fixed BOM. State whether its gland, locknut, entry seal, functional accessories and entry label are included. Keep shared tools and cable-route supports on their own lines. A carton containing several entry sets is a packaging unit, so its carton count is not the installed-kit count.

For example, a “ten-gland kit” might contain ten identical entry sets or a mixture of gland sizes. Check the quantity of each accessory too. Ten glands and five locknuts are useful only if five of those installations genuinely need no locknut.

IEC 62444:2010 sets construction and performance requirements for complete cable glands supplied by the responsible manufacturer or supplier. Extra installation accessories can be packed alongside that product. To understand which parts an assessment covers, check the identified assembly in the drawing, instructions and supporting record.

Count installed entries by exact kit variant

Count the entries that will actually use each kit before adding spares. Group only sets with the same approved part references and installation arrangement. Two glands with the same thread can have different seal ranges, materials or accessories. Keeping them on separate lines prevents an apparently adequate total from concealing a shortage of one required variant.

Use the enclosure drawing and cable schedule to count repeated entries, then add one-off entries separately. Count both ends of a cable when both ends need glands, using the variant required at each end. Exclude entries already supplied by an equipment package from your own supply total. Count unused-hole plugs, multi-cable entries and route supports according to their actual arrangement, rather than assuming one of each per cable core.

Identify each stock keeping unit, or SKU, with its full model and suffix, cable range, material, thread and kit BOM revision. If a kit contains alternative inserts, define whether it is one configurable set or several complete entry sets; the number of loose inserts is not automatically the number of usable glands.

Set the project spare rate and minimum

The purchaser or project owner supplies the spare percentage and the minimum number for each variant. Base that choice on the maintenance plan, replenishment lead time, remoteness, consequences of a missing part, expected installation losses and permitted shelf life. Those factors guide a project decision; they do not establish a universal spare percentage for cable glands.

State whether the minimum applies per SKU, per site or to another defined group. Separate commissioning consumables from operational spares if they have different purposes. The calculator applies the entered values; it does not predict failures or choose the purchasing policy. Use whole, nonnegative counts for installed kits and minimum spares.

Round each variant before adding the totals

For installed count $N$, percentage input $p$ and whole-number minimum $m$, calculate:

$S_p$ is the percentage allowance rounded upward to a whole kit. $S$ is the greater of that allowance and the stated minimum; $Q$ is the combined installed-plus-spare requirement. The ceiling symbol means round upward, so 1.2 kits becomes 2. A rate entered as 5 means 5%, or a fraction of 0.05. NIST SP811, section 7.10.2, defines the percent symbol as 0.01; it does not set a spare policy.

The following example assumes one complete entry set per kit, no previously allocated stock, and a project-selected 5% rate with a minimum of 2 spares for each variant. These are illustrative inputs, not a recommended allowance.

The three variant lines need 10 spare kits altogether. Applying 5% only to the pooled installed total of 163 gives 8.15, rounded to 9, before considering any per-variant minimum. That total cannot tell the storekeeper which parts to hold. In particular, it can hide the requirement for 2 spare C kits even though only 3 C kits are installed. Extra A kits cannot repair a C entry merely because the overall spare count looks sufficient. Calculate and identify the spares on each line first, then sum the completed lines for a project total. Keep the rate and minimum beside the result so a later quantity change can be recalculated without guessing which policy was used. The allowance remains a quantity plan for those exact entry sets.

ToolProject planningSpare Allowance CalculatorRun each exact kit variant separately. Enter its installed whole-kit count, purchaser-defined spare percentage and minimum spares. Sum the completed variant lines after rounding; the tool does not choose a universal allowance or check accessory compatibility.Qspare = max(ceil(Qinstalled × r), Qminimum)Installed quantitySpare allowanceMinimum spare quantityOpen calculator ->

A zero percentage can still produce spares when a positive minimum applies. If both are zero, the allowance is zero. Reconcile the resulting requirement with verified usable stock and the supplier’s pack sizes separately; the calculator does not subtract inventory or round to carton multiples. Keep extra packed pieces identifiable as the same exact variant.

Start with your cable and enclosure

The right kit depends on the cable it holds and the opening it mounts into. Before comparing bags of accessories, identify those two items. I would start with the cable’s construction and outside diameter, then check how the gland will attach to the enclosure. This keeps the parts list connected to the job.

For the cable, record its type, diameter range, outer-jacket material and shape. If it has armour or a screen, include their construction and relevant dimensions. Armour is the protective metal layer in an armoured cable. A screen is a conductive layer used as part of the cable’s interference-control arrangement. They can need different contact parts.

Then look at the enclosure. Does the opening already have an internal thread, or will the gland pass through a plain hole? What is the wall thickness? Is there room inside for the retaining nut and the tool that tightens it? Include the material and surface condition where accessories will sit.

A gland can also perform several duties at once. It may seal around the cable, resist pull-out, grip armour or connect a screen to the enclosure. The cable gland function overview helps you separate those duties. Once they are clear, the accessories are easier to choose.

This explains why copying the same kit to every panel can cause trouble. A plain through-hole may need a locknut. A compatible threaded opening may use a different retaining arrangement. A thick wall or an added earth tag can also change the length of thread needed, even when the nominal gland size stays the same.

Which parts belong to the gland, and which belong to the installation?

The gland’s integral parts are the components its manufacturer identifies as the complete product. Depending on the model, these can include the body, compression nut, cable seal, clamping insert, armour cone or screen contact. Keep their identity and assembly order together, including when they arrive loose in the kit.

Mounting accessories connect that product to your particular enclosure. A locknut is the retaining nut used in a through-hole arrangement when the instructions call for one. An entry seal is a specified sealing part, such as a washer or O-ring, at the gland-to-enclosure joint. The cable seal has a separate job: it seals around the cable.

Other accessories serve particular functions. An earth tag or bonding washer can form part of a specified electrical connection. Bonding means connecting conductive parts through the designed protective path. An adapter changes the mounting interface. A shroud covers an exterior part of the assembly; assess sealing and corrosion performance from the actual product arrangement.

Use the drawing from the gland outward when choosing a kit: first identify the complete gland, then add the mounting and functional accessories the entry needs. When the delivery arrives, you can work in the opposite direction. Check the labels and instructions, sort the accessories, and confirm that the gland’s own parts still form the correct set.

A separate cable cleat or route clamp supports the cable outside the gland. Keep that support requirement on the installation list, even if the supplier puts the hardware in the same carton. The scope of IEC 61914:2021 concerns cable cleats and intermediate restraints, which have their own functions and tests.

Match accessory spares to the replacement job

A spare complete entry set should contain the same required accessory identities and quantities as the installed set it replaces. For a service kit, list only the replacements that the manufacturer’s maintenance procedure permits, then identify any additional parts that procedure requires. Keep cable seals, entry seals, locknuts, contact parts and cable supports distinct.

For example, if the 6 spare A kits each include one specified entry washer and one locknut, those kits already account for 6 spare washers and 6 spare locknuts. Adding another automatic set of 6 to the order would duplicate that allowance. If the project separately wants 2 loose replacement washers, show them as a distinct line with their own part reference and reason. Check the product instructions for parts that must be renewed after disassembly; do not assume every seal is reusable or every locknut is single-use. A service replacement may also require a named compound or contact part. Its quantity and permitted combination follow the actual repair arrangement. A bag of matching thread sizes is not a substitute for a complete, compatible replacement set.

Match the kit to the cable’s functions

Choose extra parts from the cable construction and the functions needed at the entry. A label such as “marine” or “heavy-duty” gives you too little detail on its own. The useful question is whether the set has the correct seal, contact parts and mounting accessories for this cable in this location.

Unarmoured cable-entry kit

For an unarmoured cable, check the finished cable diameter and shape against the gland’s sealing and retention ranges. Include the cable-jacket material and service conditions. Then select the mounting parts for the enclosure. A cable that fits the seal still needs a gland that fits and seats correctly in the wall.

Keep cable sealing, entry sealing and cable support as separate checks. If the gland includes a captive entry seal, confirm how it is meant to seat. If the installation calls for a separate washer, identify its dimensions and material instead of adding whichever washer happens to fit over the thread.

Armoured cable-entry kit

An armoured cable needs a gland designed for its armour construction and dimensions. Match the cone, ring and preparation instructions to the cable. Relevant dimensions can include bedding diameter, diameter over armour and outer-sheath diameter. Check the seal ranges at the cable layers the gland actually contacts.

The armoured and unarmoured gland comparison explains that selection. Adding loose armour parts to an ordinary unarmoured gland creates a different assembly. Use the complete compatible gland design for the cable.

Screen-termination or EMC kit

EMC means electromagnetic compatibility: equipment working acceptably in its electromagnetic environment without causing unacceptable interference. At a cable entry, screen contact and the connection to the enclosure are part of that arrangement. Identify the screen construction, contact diameter, preparation method and required contact hardware.

I would check the screen termination separately from protective bonding. An earth tag and a screen-contact element perform different jobs. The EMC gland selection guide explains how cable screen, contact geometry, enclosure connection and operating frequency affect the choice.

Hazardous-area or barrier kit

For an Ex entry, meaning an entry used as part of equipment for explosive atmospheres, match the exact gland variant to the installation. Check its marking, protection concept, permitted cable and accessories, certificate conditions and instructions. IEC 60079-14:2024 addresses Ex electrical installation design, selection, installation and initial inspection.

If IECEx certification applies, look up the current online certificate. The IECEx FAQ identifies that online record as the controlled master version. A printed copy in the bag is useful for reference, but checking the current record lets you confirm its status and conditions.

A barrier gland may also need a named compound, mixing equipment, separators or other parts specified by its system. Check their quantity, batch, storage, shelf life and curing instructions. Use the barrier gland sealing procedure for the relevant preparation steps. General-purpose sealant is not a substitute for the specified barrier material.

More than one of these duties can apply to the same cable. An armoured, screened cable in an Ex installation needs a suitable answer for each required function.

Make sure the mounting parts can fit together

A kit needs enough usable thread for the enclosure wall, specified accessories and retaining joint. Lay out the parts in their installation order and check the dimensions before ordering. This is especially useful when a washer, earth tag or adapter has been added to an otherwise familiar gland arrangement.

The thread stack is the set of layers that occupy the gland’s projecting thread. It can include the wall, seal, washer and earth tag, followed by the required locknut engagement. The drawing’s total thread length may also include incomplete thread near the end or shoulder. Use the stated usable length for the fit check.

For a threaded enclosure opening, compare the mating thread and effective depth with the gland’s instructions. Also check the shoulder and sealing face. The threaded and plain-hole installation guide explains these different mounting arrangements.

ToolThreads & entry geometryGland Thread Stack-Up CalculatorEnter usable male thread and the specified wall, seal, washer, earth-tag or adapter thicknesses. Take required nut engagement from the product instructions. Use the result to compare axial fit, then check seating, compression, strength and tool access.Lrequired = Tpanel + Twasher + Tseal + LlocknutUsable male thread lengthPanel thicknessWasher thicknessSeparate seal thicknessOpen calculator ->

If the locknut cannot reach its specified position, revisit the part selection or wall arrangement. More tightening won’t create missing thread length. The same applies to a washer that extends beyond its seating face or an electrical accessory that cannot make the required contact. Resolve the geometry before the installer has to work around it.

Check what the assembled kit is rated to do

A kit’s contents and an assembly’s performance are different pieces of information. Use the exact model, cable, accessories and mounting arrangement when checking a claim. A product family can include several seal options or certificate variants, so make sure the record identifies the set you are actually ordering.

For ingress protection, the IP code describes protection provided by an enclosure against access, solid objects and water under the applicable classification. IEC 60529 sets out that enclosure classification. Check how the gland and its entry seal are installed in the represented arrangement.

For protective connections, follow the installation’s electrical design. IEC 60364-5-54:2011 addresses earthing arrangements and protective conductors. Identify where each required path runs and which parts make its connections. A loose conductive accessory in the kit still needs a defined position and function.

Drawings, datasheets, installation instructions and certificates answer different questions. The datasheet reading guide helps you find cable ranges, entry dimensions and model suffixes. BS 6121-5:2005 is a code of practice covering gland selection, installation and inspection; use the applicable product and project requirements alongside it. Its scope excludes glands for explosive atmospheres, fibre-optic cables and mineral-insulated cables.

Check the delivery before similar parts get mixed

Check kits while each opened set still has its packaging and label. Compare the model, parts and quantities with the order and BOM. This is a good time to find shortages or damaged items, because you can still tell which package they came from and which entry they were intended to serve.

I would keep similar-looking sizes in separate groups until that check is complete. Read the part references and revisions. Look for thread or sealing-surface damage, contaminated seals and any storage-sensitive materials. Follow the inspection plan for sampling and acceptance. Keep doubtful parts apart from accepted stock while the supplier or responsible engineer resolves them.

Store and issue spares with their identity intact

When issuing a kit, label it for the entry or repeated installation it belongs to and include the current instructions. Keep unused spares identifiable when they return to storage. Preserve the model, revision, seal compound or material reference, batch and any expiry information required by the product instructions. A loose seal without those details cannot be confidently assigned to a replacement entry.

ISO 2230:2026 covers inspection, records, packaging and storage of rubber products before use; its public scope also connects packaging with material and product identification. Follow the actual seal or compound’s storage conditions and life limits. Do not infer a common shelf life from a shared material abbreviation, or reset an expiry date when a part is repacked.

Keep unopened stock separate from used, damaged, contaminated or unidentified returns until their disposition is resolved. Issue suitable stock in an order that respects its expiry or inspection dates, and update the remaining quantity by variant. A spare that has expired or cannot be identified is not an available replacement merely because it is still in the bin. Review the planned quantity when the installed BOM changes so an obsolete kit is not counted against a new configuration.

Before fitting the gland, follow the equipment and site’s safe-work procedure. UK HSE guidance calls for planning the work and securely isolating relevant energy sources. Then compare the actual cable, opening and kit once more before cutting or stripping the cable.

When is a kit worth buying?

A kit is useful when it groups matched parts for a known installation and makes them easier to pick, deliver and use. Repeated panels and maintenance jobs with a defined replacement arrangement can suit this approach. Compare the kit’s actual contents with the work you need it to support, including any separately supplied items.

Separate purchasing can also work well. If your enclosures or cables differ, a standard kit may include unnecessary parts while missing the ones needed for another entry. I would compare the full parts lists before comparing prices. Include required seals, locknuts, spares, storage needs and any shelf-life controls in that comparison.

Use your own project records if you want to estimate savings in picking time, shortages or installation delays. The delivery format alone doesn’t tell you how much time or money a kit will save.

Conclusion: Choose a kit for the entry you need to build

Ask for the parts list, then compare it with your cable and enclosure. Separate the gland’s own components from the accessories needed to mount, seal or connect it. That makes it much easier to see whether a kit is complete for your installation and whether its parts can fit together. Count installation and spare requirements by the same exact variant, with the project rate and minimum stated.

Check the delivered set before its identity is lost among similar parts. With the right labels, matched components and current instructions, the installer has a clearer starting point. The value of a kit is the practical help it provides for that particular entry, and you can assess that before placing the order.

FAQs about cable gland kits

Does every cable gland kit include a locknut and sealing washer?

No. Those parts depend on the mounting arrangement. A plain through-hole may need a locknut and a specified entry seal. A compatible threaded opening may use different parts, and some glands have captive seals. Check your opening and the gland instructions, then ask whether each required accessory is included or supplied separately.

Are all parts in a cable gland kit covered by the gland certificate or test report?

Check the assembly identified in the record. A kit can include extra mounting or support accessories alongside the complete gland. Being in the same bag doesn’t bring every part into the same assessment. Match the gland variant, cable, seals, accessories and installation arrangement to the certificate or test report you need.

Can components from two cable gland kits be mixed if the thread size matches?

Use the parts permitted for the selected gland and installation. Matching threads tell you only part of the story; seals, armour parts, screen contacts and material combinations can still differ. If a substitution is needed, confirm the exact part and arrangement before assembly. Keep the revised set identifiable for installation and later maintenance.

How many spare cable gland kits should I order?

Use the project-approved installed count, spare percentage and minimum for each exact variant. Round the percentage allowance upward to a whole kit, then take the greater of that result and the minimum. Keep compatible accessories with the replacement set. There is no universal percentage that suits every installation or maintenance plan.

How should spare seals and barrier compound be stored in a kit?

Follow the material’s specified storage conditions and shelf life. Keep seals clean and protected from damage, with their model and material identity intact. Keep barrier compound labelled with its batch and expiry information. Check its condition before use, and use only the compound and associated parts named for the selected barrier-gland system.

Sources and technical references

• NIST SP811, Chapter 7, Rules and Style Conventions for Expressing Values of Quantities, accessed 2026-10-22.
• ISO 2230:2026, Rubber products - Guidelines for storage, accessed 2026-10-22.
• IEC 62444:2010, Cable glands for electrical installations, accessed 2026-10-22.
• BS 6121-5:2005, Selection, installation and inspection of cable glands and armour glands, accessed 2026-10-22.
• IEC 60529 consolidated edition, Degrees of protection provided by enclosures, accessed 2026-10-22.
• IEC 60079-14:2024, Explosive-atmosphere electrical installation design, selection and installation, accessed 2026-10-22.
• IECEx, Frequently asked questions about the controlled online certificate system, accessed 2026-10-22.
• IEC 60364-5-54:2011, Earthing arrangements and protective conductors, accessed 2026-10-22.
• IEC 61914:2021, Cable cleats for electrical installations, accessed 2026-10-22.
• UK Health and Safety Executive, Work on electrical equipment, machinery or installations, accessed 2026-10-22.

Products

• Cable Glands