KEENSERTS
Materials and Surfaces

Information about KEENSERTS® materials

General applications
As standard, KEENSERTS inserts and bolts are made of cold-drawn austenitic Steel manufactured according to DIN EN 10088-3 1.4305 C700 and can be used up to +150°C. Above At this temperature the yield strength drops significantly as work hardening is reduced.The KEES, are made of AISI 302 or optionally of 1.4310.

High temperature and mechanical load applications
For applications at higher temperatures, as well as higher mechanical loads, we manufacture KEENSERTS inserts and bolts from the material AISI 660 – A286 (1.4980 / 1.4944). The aged austenite still has a yield strength of >450 MPa at +500°C and an Rp0.2 of >600 MPa at room temperature. A286 is scale-resistant up to +700°C and has very good corrosion resistance.

Seawater resistant, non-magnetic applications
If maximum corrosion resistance with good mechanical properties is required, we manufacture our KEENSERTS inserts from aluminum bronze (2.0966). This material is seawater resistant and has good mechanical properties with an Rp0.2 of >330 MPa, as well as an Rm of >650 MPa and does not galling when screwed with stainless screws due to self-lubrication. These special thread inserts are provided with KEES made of V4A. Aluminum bronze is suitable for application temperatures up to +350°C. Alternatively, threaded bodies and KEES made of V4A can be combined.

Information on KEENSERTS® coatings

Passivation
KEENSERTS inserts are passivated according to AMS 2700, method 2. This is a Cr-6 free passivation, which cleans the surface and accelerates Cr-oxide formation. The passivation is suitable for application temperatures up to +150°C.

Dry lubricant film
KEENSERTS inserts with clamping screw locking are coated with a REACH compliant dry lubricant film. This sliding film is a thermosetting, lead-free MoS2 anti-friction coating and is suitable for application temperatures from -150°C to +200°C. The thread tolerances specified in the tables starting on page B1 apply before the MoS2 coating.   

Special coatings
If your applications require the use of a barrier layer between the surrounding material and the thread insert, it is possible to apply a Cr-6-free ZnNi layer according to AMS 2417 or alternatively a tin coating. 

It is also possible to apply other coating materials, such as wax dispersion. 

Due to increased demands on durability, contact corrosion is also a much-discussed topic. We are
pleased to give advice.