At Mendizabal we specialise in the manufacture of two kinds of self-locking nut: the slotted 9720 SN and the 9700 MH with internal spring. We offer our customers the integral production, treatment and finish of special nuts for every project. Our team of professionals manages and controls the complete production process to guarantee the quality of these security nuts.

More than 25 years of producing self-locking nuts demonstrate our experience. Our greatest pride lies in the trust and satisfaction of each and every one of our customers, which has enabled us to improve our quality and service over these many years of working together.

We produce nuts both in stainless steel and steel (qualities 8 and 10). We provide an integral service including the heat and surface treatment required by the customer in each case. Our nuts come with coatings ranging from traditional dichromate to those in greatest demand today, such as zinc flake or zinc nickel.

Our self-locking nuts are designed to withstand high performance environments where dynamic load and vibration may occur. To guarantee the quality of these security nuts, at Mendizabal we carry out strict controls enabling us to guarantee their functional characteristics.

Manufacture of self-locking security nuts


We have been manufacturing slotted self-locking nuts for more than two decades, with a solid commitment to quality

Slotted self-locking nuts


We offer you an extensive catalogue of 9700-MH self-locking nuts, from M04 to M60

Self-locking nuts with internal spring
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