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The EJOT JC6-KB is an A4 (316) stainless-steel bi-metal concrete screw intended for demanding installations such as permanently wet interiors and outdoor, industrial or maritime sites. Its stainless body and head are precision-welded to hardened carbon-steel lead threads, combining corrosion resistance at the exposed parts with a hardened cutting section for concrete.
That construction and EJOT’s stated ETA scope make the JC6-KB a credible option for cracked and non-cracked concrete, but they do not constitute a project design approval. Select the diameter, length, head style and embedment from the current technical documentation, then check the actual concrete strength, edge distances, spacing, loads, fire requirement and environmental exposure.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat is the EJOT JC6-KB concrete screw?
The JC6-KB is a self-tapping screw anchor for concrete. EJOT describes it as a bi-metal fastener: the main body and hexagon head are A4 grade 316 austenitic stainless steel, while the lead threads are hardened carbon steel. The two materials are precision-welded, and EJOT says a gold mark identifies the bi-metal product. The arrangement puts corrosion-resistant stainless steel at the exposed head and shank while retaining a hardened thread capable of cutting into concrete.
The head is a hexagon head with an integral flange. The product page lists M6, M8 and M10 diameters, with SW13 or SW15 across-flats drives depending on the size. Listed lengths are 50–80 mm for M6, 55–100 mm for M8 and 90–120 mm for M10. Confirm the exact part number and length in the current product data before ordering, because the range is not a substitute for calculating the required embedment and fixture thickness.
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EJOT’s JC6-KB specification states that the screw is fully removable. It is installed by pushing it through the fixture and driving it into a correctly drilled hole; unlike an expansion anchor, the screw does not rely on an expanding sleeve.
Where does EJOT say the JC6-KB can be used?
EJOT lists permanently wet indoor use and outdoor use, including industrial and maritime environments. Its examples include canopies, gates, shelving systems, cable trays, handrails and rails, stadium seating, impact protection and timber brackets. Those examples describe the manufacturer’s intended application field; they are not blanket approval for every building, exposure or load.
For a real installation, identify the exposure before choosing the fastener. A coastal handrail, a frequently washed industrial area and a dry internal bracket can have very different contamination, moisture and maintenance conditions. Check whether adjacent metals, coatings, cleaning chemicals or trapped water could create a corrosion cell. The screw’s A4 designation is useful evidence of material selection, not permission to ignore the rest of the assembly.
What approval and fire information is stated?
EJOT lists ETA approval for cracked and non-cracked concrete in strength classes C20/25 to C50/60 for the JC6-KB. The same product information lists R120 fire resistance. Use those statements only within the conditions and configuration covered by the applicable European Technical Assessment and its associated technical documents.
An ETA does not automatically approve every diameter, embedment, fixture or load direction for every project. Before specification, obtain the latest assessment and confirm that the concrete class, member thickness, reinforcement arrangement, installation method, edge distances, spacing, temperature and fire design match the proposed detail. Where national rules or the building control authority require additional evidence, that requirement still applies.
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How is the JC6-KB installed?
Installation is a push-through process, but the hole, embedment and cleaning sequence remain critical. Use the current EJOT installation instructions and the design engineer’s requirements rather than treating the following outline as a substitute for them.
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- Confirm the design. Select the diameter and length from the approved design, allowing for fixture thickness, washers or packers, required embedment and the minimum base-material thickness. Check that the proposed location avoids prohibited reinforcement or services.
- Check the substrate. Verify that the member is concrete within the approved strength range and determine whether the design is for cracked or non-cracked concrete. Masonry, lightweight concrete or a damaged substrate may require a different anchor system.
- Set out edge distances and spacing. Mark the hole positions and compare them with the minimum values in the ETA and design calculation. “No expansion forces” can help where edge distance or spacing is restricted, but it does not eliminate the minimum distances needed for concrete breakout, steel resistance and fire design.
- Drill the specified hole. Use the drill diameter, depth and equipment stated in the installation documentation. A hole that is too shallow, too wide, damaged by over-drilling or contaminated with dust can reduce the designed resistance.
- Clean and inspect the hole. Remove drilling dust using the method specified for the product. Check the actual depth and the condition of the concrete before inserting the screw; do not conceal a defect behind the fixture.
- Push the screw through the fixture. Align the fixture and insert the JC6-KB so the threads engage the prepared hole rather than cross-threading against the fixture or an obstruction.
- Drive it to the specified setting. EJOT states that there is no predefined tightening torque for this product. That does not mean the screw can be driven by guesswork: use the stated installation tool, driver setting, embedment and visual seating criteria in the current instructions, and stop if the fixture does not seat correctly.
The anchor is removable, which can help with temporary fixtures, maintenance or replacement. Removal does not make a previously used hole automatically suitable for reuse; the engineer or installation instructions must determine whether a new anchor and location are required.
How should the JC6-KB load figures be used?
The JC6 A4 brochure provides recommended tensile and shear loads for the listed models and installation settings. Those figures are conditional data, not universal capacities. EJOT says the table is based on C20/25 concrete, correct installation, no influence from edge distances or spacing, and compliance with the minimum base-material thickness.
In practice, a design check must consider the governing failure mode and the actual geometry. Depending on the detail, resistance may be limited by concrete breakout, pull-out, steel failure, pry-out, edge breakout or a combination of tensile and shear actions. An edge or corner, a thin slab, a group of closely spaced anchors, cracked concrete or a fire situation can produce a lower usable resistance than an isolated-anchor table value.
Record the assumptions alongside any value taken from the brochure: JC6-KB diameter and length, effective embedment, concrete class, cracked or non-cracked condition, load direction, edge distance, spacing, member thickness and safety factors. If any assumption differs, obtain a project-specific calculation or engineering confirmation instead of interpolating a number informally.
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Which JC6 head style should you choose?
The JC6-KB is not the only A4 option in EJOT’s JC6 family. Head geometry determines how the fixture is supported and how much of the fastener remains proud, so choose the variant to suit the joint rather than assuming one head is universally superior.
| Variant | Head and drive | Listed lengths | Stated use and approval information |
|---|---|---|---|
| JC6-KB | Hexagon head with flange; SW13 or SW15 | M6: 50–80 mm; M8: 55–100 mm; M10: 90–120 mm | A4 bi-metal; permanently wet indoor and outdoor use, including industrial and maritime environments; ETA for cracked and non-cracked C20/25–C50/60 concrete and R120 fire resistance |
| JC6-ST | Countersunk head; TORX T30 | 50–100 mm | A4 option with the same stated wet/outdoor application categories and ETA scope; suited where a countersunk finish and compatible fixture are required |
| JC6-FR | Pan head; TORX T30 | 50–80 mm | A4 option with the same stated wet/outdoor application categories and ETA scope; suited where a pan head is preferable |
Specifications in this table are from EJOT product pages checked November 2026. The head-style alternatives are described on the JC6-ST page and JC6-FR page. Do not swap a countersunk or pan-head screw into a detail designed for a flanged hex head without checking bearing area, fixture clearance, drive access and the relevant approval data.
How does A4 stainless steel affect corrosion decisions?
A4 stainless steel is commonly identified with 316-family austenitic stainless steel, and EJOT specifies A4 material for the JC6-KB body and head. EJOT’s product announcement states an environmental classification from C1 to C4 under BS EN 12944. Treat C1–C4 as EJOT’s product claim and still assess the project exposure, because a classification does not describe every chemical, crevice, temperature or maintenance condition.
The hardened lead thread is carbon steel, which is why the product is bi-metal rather than a solid stainless screw. EJOT’s corrosion guidance warns that bimetallic corrosion must be considered when corrosion-resistant materials are combined. Avoid assuming that an A4 screw is automatically compatible with every bracket, washer, coating or embedded metal. Where dissimilar metals are in contact and moisture is present, specify suitable isolation or a compatible material system when the design calls for it.
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EJOT also explains that stainless-steel corrosion protection cannot be compared directly with galvanic or inorganic/organic-coated screws using a salt-spray test. A salt-spray result from another fastener type would therefore not establish equivalent service life for the JC6-KB. Base the decision on the material, exposure assessment, approval documents and project experience appropriate to the environment.
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What should be checked before ordering?
- Substrate: Confirm concrete type, strength class, cracked or non-cracked condition, member thickness and any reinforcement constraints.
- Design actions: Establish tensile, shear and combined actions, including impact, vibration or cyclic effects where relevant.
- Geometry: Verify effective embedment, fixture thickness, edge distances, spacing and access for the selected head and drive.
- Exposure: Document moisture, salt, industrial contaminants, cleaning chemicals, temperature and contact with dissimilar metals.
- Fire: If fire resistance is required, confirm that the R120 claim and its conditions apply to the exact assembly and design situation.
- Installation: Use the current drill, cleaning, driver and seating instructions; train installers to recognise damaged holes and poor seating.
- Documentation: Keep the current ETA, product data, installation instructions and any engineer’s calculation with the project records.
These checks prevent a common error: selecting an A4 screw because the environment sounds severe, then overlooking a thin concrete member, inadequate embedment or an unsuitable head-to-fixture interface.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is the EJOT JC6-KB suitable for a tougher-environment project?
The JC6-KB is a sensible candidate when a project needs an A4 stainless exposed fastener, a hardened self-tapping lead thread and a removable, non-expansion installation in approved concrete. EJOT’s stated applications cover wet indoor, outdoor, industrial and maritime settings, and its published approval information addresses cracked and non-cracked C20/25–C50/60 concrete with an R120 fire classification.
It is not a universal substitute for design. The correct choice depends on the project’s load calculation, concrete condition, geometry, exposure and required head style. Specify the JC6-KB only after those conditions have been checked against the latest EJOT documentation; choose JC6-ST or JC6-FR when the fixture requires a countersunk or pan head and verify their corresponding installation data.
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This guide uses EJOT UK’s JC6-KB, JC6-ST and JC6-FR product pages, the JC6 A4 concrete-screw brochure, EJOT’s concrete-screw overview and its materials and corrosion guidance. The selection criteria are stated material and dimensions, published application and approval scope, installation characteristics, corrosion qualifications and the practical fit between head style and fixture. Product pages and brochures can change, so the latest version should govern a project specification.
Frequently Asked Questions
Can the JC6-KB be used in cracked concrete?
EJOT lists ETA approval for both cracked and non-cracked concrete from C20/25 to C50/60. The approval applies only within its stated installation and design conditions, so confirm the exact embedment, edge distances, spacing and load case in the current ETA before relying on it.
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Is an A4 concrete screw the same as a solid stainless-steel screw?
No. The JC6-KB has an A4 stainless body and head but hardened carbon-steel lead threads, joined as a bi-metal construction. That improves thread-cutting capability while requiring attention to galvanic compatibility and moisture at material interfaces.
What does ‘no predefined tightening torque’ mean for installation?
It means EJOT does not specify one universal torque value for the JC6-KB. Installers must follow the current product instructions for drilling, driving, embedment and seating, and should stop and investigate if the fixture does not seat correctly.
Can I reuse the hole after removing a JC6-KB?
The screw itself is designed to be fully removable, but removal does not prove that the concrete hole retains its original capacity. Reuse or relocation requires confirmation from the applicable installation instructions or the project engineer, especially for safety-critical or heavily loaded fixtures.
When is the JC6-ST a better fit than the JC6-KB?
The JC6-ST uses a countersunk head and TORX T30 drive, so it may suit a fixture that needs a flush finish or countersunk bearing surface. It is not automatically interchangeable with the flanged hex-head JC6-KB; check fixture geometry, access, length and the relevant approval data.
