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Growermetal

Growermetal, thanks to 70 years of experience and technical know-how achieved in the production of flat washers, safety and spring washers as well as split lock washers for railways, the company has become an important reality in the fasteners field. In addition to the production of parts according to standards, Growermetal has reached a great experience during the years in the production of parts according to drawings and customer specifications.

The corporate philosophy adopted by Growermetal established the international success of the made in Italy: high quality products, continuous technological innovation, high reliability and the greatest attention paid to customer relationships.

Growermetal’s products are the right answer for those who require a fastening application at the highest security level. All company processes are IATF 16949, ISO 9001 and ISO 14001 certified.

Growermetal’s R&D department has developed the safety washers Grower TenKeep® exploiting the technical know-how acquired over the years together with the use of simulation software and numerous laboratory tests.

The safety washers Grower TenKeep® of Growermetal are flat washers that have the 2 surfaces with knurls of different geometry, specially designed in order to ensure maximum performance against loosening of the bolted joints, even in the presence of extreme vibrations and dynamic loads.

DESCRIPTION

The safety washers Grower TenKeep® of Growermetal are flat washers that have the two surfaces with knurls of different geometry, specially designed in order to ensure maximum performance against loosening of the bolted joints, even in the presence of extreme vibrations and dynamic loads.

SIDE A
The side of the washer on the head of the screw/ nut side (side A) slides against the surface of the underhead of the screw/ nut when tightening the bolted joint. The advanced serration geometry of this side instead, counteracts very efficiently the loosening of the bolted joint connection.

This side of the washer also has a chamfer on the hole which provides the dual function of:
Avoiding any interference with the radius under the screw head.
• Allowing the user to orientate the washer correctly.

Grower TenKeep® safety washers are manufactured by Growermetal in 3 different versions and can be used with bolts of all strength classes up to 12.9.

SIDE B The side of the washer which is in contact with the bearing surface (side B) becomes immediately solid to the bearing surface when the bolted joint is tightened, thanks to the exceptional grip of its knurling. The washer then remains permanently solid to the bearing surface.

These features of the Grower TenKeep® washer guarantee 3 main technical advantages:
The friction conditions are defined and uniform, not depending on the material and on the mechanical characteristics of the bearing surface. As a consequence the tightening torque to be applied in order to achieve the desired screw preload is always the same.

During tightening and untightening of the bolted joint, the Grower TenKeep® washer does not damage the bearing surface, even on galvanised, painted or soft surfaces.
The untightening torque is significantly higher (+40% minimum) than the tightening torque.

CHARACTERISTICS

Grower TenKeep® safety washers are manufactured by Growermetal in 3 standard series:

Medium Series, ideal for hexagonal head bolts.

Large series, ideal for flange-headed bolts and for bearing surfaces made of soft materials (aluminium, plastics, etc...).

Cylindrical series, ideal for cylindrical head bolts.

The hole geometry of all Grower TenKeep® washers has been specially designed in order to ensure that there is no geometric interference with the under-head radius of all screws according to ISO and DIN standards.

Standard material: carbon steel quenched and tempered with a surface and core hardness of 510-560 Hv 10.

Standard surface treatment:Delta Protekt® KL120 - Red corrosion resistance 1000 hours minimum according to NSS ISO 9227.

ADVANTAGES

Excellent locking performance in the presence of vibrations and dynamic loads.

Precise match between tightening torque and screw preload, regardless of the material of the bearing surface.

No damage of the bearing surface during its application, even on galvanized or painted surfaces.

Untightening torque significantly higher (+40% minimum) than the tightening torque.

Guaranteed absence of geometric interference between washer hole and under-head radius of all screws according to ISO and DIN standards.

Minimum space requirement: the washer always remains inside the screw head.

All Grower TenKeep® washer series are also suitable for applications with embedded holes.

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