What is a KLEEcoil?
KLEEcoils are metal threaded bushings with internal or external thread, which are slightly conical at one end and have slots or side holes. The bushings are self-tapping and can therefore be screwed into bores without prior thread cutting. Properly installed, the bushings withstand heavy tensile loads and also withstand vibrations of any kind. The internal thread is precise and very durable.

Where are KLEEcoils used?
KLEEcoils are used in light metal alloys, cast iron, plastics, wood and fiber materials. You can save material by using smaller screws with a higher load (see fig. 1). KLEEcoils are also suitable for repair of worn threads. The worn thread is drilled away and replaced by a KLEEcoil. This means that you can continue to use the same screw diameter. You also get a better and more durable thread.

How to mount KLEEcoils?
If you only need to mount a single or a few KLEEcoils, it can be done as shown in fig. 2. In serial production tools are used.

Easy and trouble-free installation is achieved by following the instructions below:

1) KLEEcoil type is chosen according to material and hardness.

2) The diameter of the hole is determined on the basis of the tables used for the individual types. The concept of 'flank coverage' is defined in fig. 3.

3) Minimum wall thickness "S" depends on the elasticity of the material: Plastics 0.25 D to 0.90 D
Light metal alloys 0.25 D to 0.60 D
Cast iron 0.30 D to 0.50 D
D is the outside diameter of the KLEEcoil. See fig. 4.

4) The KLEEcoil should be recessed as shown in fig. 5a or fig. 5b.
Metallic materials and plastics a = 1 to 1.5 times increase of with low to medium hardness: external thread (Fig. 5a)
Hard and brittle plastics: DA = D + 0.2 to 0.4 mm. a = 1 to 1.5 times pitch of external thread (Fig. 5b)

Quality
The production of KLEEcoils take place in Germany according to DIN EN ISO 9001 and ISO/TS 16949:2002 and ISO 14001:2004. KLEEcoils are continuously tested and checked during and after production.

BRD KLEE A/S is certified according to ISO 9001:2015 by Norske Veritas. Should KLEEcoils not live up to your expectations even if they are used according to the recommendations then contact BRD. KLEE immediately.

Types of coils
There are different types of KLEEcoils.

Brd. Klee can help with surface coating of screws and bolt products that need to be secured against detachment. Surface treatment of e.g. thread, screws, bolts, nuts can secure your application with:
- Extra thread fastening
- Provision of a fluid or gas-tight seal
- Protection against damage to the workpiece surface during screwing
- Extra protection against thread causing damage in e.g. thin plate
- Exactly dosed amount of surface treatment to avoid spills and tubes running etc

In collaboration with our manufacturer of Klee-coil we offer the following types of coating:

TufLok® blue nylon coating. For locking and sealing screw connections. Temperature from -56°C to +120° C.
Nytemp® orange nylon coating. Screw locking and sealing system for high temperature stress. Temperature up to +200° C.
Nyseal® Application of elastic seals on e.g. screws, either directly under the head, flange or on the thread run-out. Can eliminate the need for use of washers, seals or O-rings.
Nyplas® PVC/Plastisol sealing material, applied directly under the head, flange or runout threads on threaded elements. Can eliminate the need for use of washers, seals or O-rings.
Nycote® coating method involving the application of insulation teflon powder. The result is a protective layer which prevents unwanted deposits from primers, paints and other surfaces during the electrodeposition process.
Precote® locking coat for external and internal threads. Available in various executions. Temperature resistance by type up til +850° C.