Metric Locknuts – Counter Nuts for Connectors and Bulkhead Passages

Metric locknuts (narrow nuts, counter nuts) are specialized fasteners used in power hydraulic systems for stable mounting, positioning, and locking of adjustable elements and bulkhead connections. They allow for permanent fastening of bulkhead quick-release couplings, elbow connectors and straight connectors to mounting plates, housings, brackets, or machine frames without the risk of loosening under vibration and pressure.

Application in Hydraulic Installations

Metric thread counter nuts perform key functions in many assembly areas:

• Mounting of connectors and bulkhead quick-release couplings: They are used to rigidly immobilize elements passing through tank walls, sheet metal, or brackets (e.g., in a front loader console TUR).
• Setting the direction of connectors: They allow setting an angle, tee, or adjustable connector at any angle when connecting to a pump, actuator, or manifold, before its final locking.
• Seal compression: Together with a metal-rubber washer or a backup ring, they compress the O-ring seal against the seat face, guaranteeing full tightness under high pressure.

Workmanship Standards and Norms

• Material: Precisely machined free-cutting steel.
• Corrosion protection: Durable zinc coating (galvanic zinc plating) protecting against moisture, oils, and atmospheric factors.
• Standards and markings: Manufactured according to the standard PN-65/M-73109 and standards DIN 2353 / ISO 8434-1 (interchangeable designations: series GM, TN 102/118, CPDL, CPDS, 1087).

Wide Range of Metric Thread Sizes

In the HYDRON store offer, you will find metric locknuts suited for light (L) and heavy (S) series connectors. Available sizes include: M8x1, M10x1, M12x1.5, M14x1.5, M16x1.5, M18x1.5, M20x1.5, M22x1.5, M24x1.5, M27x2, M30x2, M33x2, M36x2, M39x2, M42x2, M45x2, M48x2, M52x2, M56x2, and M60x2.

Frequently Asked Questions (FAQ)

How does a locknut differ from a standard hex nut?

A hydraulic locknut is noticeably lower (narrower) than a standard ISO/DIN nut. Its compact profile allows for mounting on short thread lengths and in narrow mounting spaces at bulkhead walls.

How to correctly install an adjustable connector with a locknut?

The locknut should be screwed onto the connector body thread along with the washer and seal, screw the element into the port, set the required hose outlet direction, and then tighten the locknut with a wrench, locking the system in the desired position.