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THE PRECOATING
Pre-coating is a technique that was developed for car manufacturers about 30 years ago.
developed by automobile manufacturers. In the 1980s the fixings were secured with liquid adhesives, but theirs
Removal caused numerous problems on the assembly lines. The pre-coated solution prevailed
due to their ease of use and their favorable economic balance. The pre-coating is used today
used in all branches of industry. It is possible both small series (1000 pieces) and very large
Series (1 million pieces) in a very wide range of applications: screws from M1 to M20, nuts from M5 to
M30, axles, bolts, connectors, plugs, inserts, ... special parts.
THE ADVANTAGES
Pre-taped fasteners replace traditional braking solutions with one technique and one
incomparable economic advantages :
- Higher performance: unrivaled resistance to vibration.
- Simple construction: Replaces standard screws without rethinking the assembly.
- Fast assembly: no washers or glue are required.
- Technical control: the amount of glue introduced into the connection is always the same.
- Impeccable quality: it is impossible to forget to brake.
- Significant reduction in assembly costs: High productivity in the workshop or on the construction site.
- No hygiene and safety problems with liquid adhesives.
COMPARISON OF BRAKING SOLUTIONS
TUFLOK pre-coating
Tuflok is a nylon powder that is applied to the threaded part under the influence of heat. When screwing, the nylon
is compressed. The radial tension created by the elastic deformation of the product causes braking by
increase in friction.
The brake is repositionable because the deformation of the polyamide is partially reversible and allows it.
This means that the part can be screwed on and off several times. The braking function is active immediately
after screwing in.
Tuflok 180:
The Tuflok 180 coating is applied to approximately 180° of the screw circumference. She offers one
excellent resistance to shock and vibration. It can be reused multiple times.
Tuflok is effective even on live connections.
It is especially recommended for set screws.
Tuflok 360 :
The Tuflok 360 coating is applied around the entire perimeter of the part. It is suitable for
Applications where high pressure sealing against liquids or gases is required.
It is also reusable multiple times.
Applications
THE ADVANTAGES
Easy to find thanks to the blue color of the Tuflok on the screw.
Can be reused multiple times.
Good resistance to shock and vibration.
Torque adjustable depending on the application.
Patch position and width adjustable.
Replaces nut, self-locking nut, brake disc, cotter pin, etc... braking systems
Braking with or without tension in the connection.
No polymerisation: Braking and sealing are possible immediately.
Good resistance to chemicals: alcohols, petroleum, diesel, oils, kerosene.
FEATURES AND PRODUCTS
Permit
The Tuflok is approved according to numerous standards:
Renault 39-02-010
P.S.A B141235
FROM 267-28
IFI124 & 524
BS 7715:1994
GM 6189P
OF 970
JFS 02.01.04
Pre-coating BRAKE FUNCTION
During assembly, the adhesive released by the bursting of the microcapsules between the thread and the threaded hole
mixes quickly with the hardener and bonds the threaded parts together.
seal the connection.
The pre-coating is carried out systematically over 360°.
Reuse of microencapsulated products is not recommended.
APPLICATIONS
THE ADVANTAGES
High performance at unscrewing torques.
Low torque when installing.
Fast curing.
Technological connection (screw + patch + sorting).
Easy identification.
Good resistance to hydrocarbons and solvents.
Adaptation of the coating position to the respective application.
Application temperature from -56°C to +200°C.
Replaces bottled liquid adhesives.
Replaces mechanical screw locking systems.
Permit
The pre-coating of the braking function is approved according to numerous standards:
Renault 39-02-010
P.S.A B141235
OF 267-27
IFI125 & 525
BS 7795
GM 6175M
FORD WX200 et WX201
CLIENT'S CHOICE
Observations :
This last page must be returned to the sales department so that an accurate quote can be prepared.
Braking torque when screwing in, breakaway torque and braking torque when screwing out can be prescribed, provided that
if they are realizable (please check during the consultation).
For information, below is an excerpt of the torques that must be achieved for the connection function.
mechanically weak (TUFLOK) for the standards:
- PSA: B14.12.35
- RENAULT: 39.02.010
Example: The following torques can be achieved for an M8 screw with a pitch of 1.25 mm:
Braking torque when screwing in (Cfv): < 4.0 Nm
Release torque (Cdec): > 2.5 Nm
Brake torque when releasing (Cfd): > 1.5 Nm.
Tests performed on a standard degreased and uncoated HU nut with a height of 0.8x diameter.
(here 6.4 mm).
We do not carry out these tests with an HU nut (PSA and RENAULT standard), but with a ring.
standardized ring, as there is too much variation in the threaded holes depending on the nut batch. The control of
is carried out at TUFLOK directly on the production line (workpiece in vices + torque control).
of the torque with a torque wrench). On the other hand, torque control on the production line is not possible.
With PRECOTE or 3M you have to wait for the hardening.