COMPATIBILITY DETAILS

Threaded Interface

Threaded connections are most frequently found in hydraulic systems where grips and fixtures are larger and far less frequently removed. Threaded connections are also used on Instron® electromechanical systems above 100 kN (22,500 lbf). Threaded connections on hydraulic systems also feature wedge washers, which ensure that a pre-loaded connection does not loosen when used in fatigue applications. Threaded connections are defined by the diameter (in a similar way to clevis connections) and by the thread form. The thread form can be US customary (inches) or metric (millimeters) and Left-Handed (LH) or Right-Handed (RH).

Many systems using threaded connectors feature female threads in the load cell and crosshead/actuator. Grips and fixtures generally feature female RH threads, although there are examples where male LH threads are used, especially on accessories designed for electromechanical systems.

As with the clevis design, it is simply a case of matching male and female versions of the same size and thread form to ensure compatibility.

Type I: M30

Male Fixture End

A 28.72 mm

B M30×2 mm LH thread

Female Fixture End

C 40.00 mm

D M30×2 mm LH thread

E 40.02 mm diameter

F 3.06 mm

Notes: 1. RH threads were adopted on 8800 Series Dynamic systems from serial number 2000