PRELIMINARY

1. Which standard: ISO 594/1 or ISO 594/2?
Both ISO 594/1 and ISO 594/2 have the same Luer 6%-taper male conical fitting. ISO 594/1 identifies the requirements of the Luer 6%-taper male conical fitting for both standards. ISO 594/2 adds a permanently connected internally threaded collar. ISO 594/1 also defines the gages to test the Luer 6%-taper male conical surface for size in Figures 3a and Figure 3b.

2. Which gage: ISO 594/1 Figure 3a or ISO 594/1 Figure 3b?
The physical properties of your Luer 6%-taper male conical fitting test part will determine which gage is required. For rigid materials you need to a gage made to the requirements of ISO 594/1 Figure 3a. For semi rigid materials you need a gage made to the requirements of ISO 594/1 Figure 3b. How do you determine if your part is rigid or semi-rigid? ISO 594/1 provides some clarification:

NOTE - It is not practicable to define the characteristics of rigid or semi-rigid materials with precision, but glass and metal may be considered as typical rigid materials. By contrast, many plastic materials may be regarded as semi-rigid although the wall thickness is an important factor influencing the rigidity of a component. (ISO 594/1-1986 (E), Page 1, Paragraph 1, NOTE)

3. Which style of gage is needed: Ring or Ring with Handle?
Testing the Luer-Slip male conical fitting of ISO 594/1 is easier than testing the Lure-Lock male conical fitting of ISO 594/2 because ISO 594/2 has a lock collar surrounding the male conical fitting. To facilitate testing of the conical fitting under the lock collar, a special thin-wall ring gage with handle has been developed. The thin-wall ring gage with handle can be used to test both ISO 594/1 and ISO 594/2 products. Caution: Because of the thin wall, this gage is prone to braking. If you only need to test the Luer Slip style of ISO 594/1, then the standard ring gage style will be sufficient and less costly.

PROCEDURE

The following data is extracted from ISO 594/1 and expanded for further clarification.

5.1 Gauging Test: The procedure shall be carried out as specified below in 5.1.1 to 5.1.4.

5.1.1 Carry out the test using steel gauges as illustrated in ISO 594/1 Figure 3. See paragraph 2 above for additional clarification.

5.1.2 Carry out the test at a temperature of 20°C +/-5°C.

5.1.3 Prior to testing, condition products made from hygroscopic materials at 20°C +/-5°C and 50% +/-10% relative humidity for not less than 24 hours. Conditioning is not required for products made from non-hygroscopic materials.

5.1.4 Apply the gauge to the conical fitting with a total axial force of 5 Newtons, without the use of torque. The ISO 594 Test Assembly Machine can be used to apply the gage to the test fitting. Remove the axial load.

4.1.1 Gauging test results:

a. The small end of the male conical fitting shall lie between the two limit planes of the gauge.

b. The larger end of the tapered portion shall extend beyond the datum plane of the gauge.

c. Rocking shall not be evident between the gauge and rigid material fitting undergoing test. This test for freedom from rocking may also be found useful (not required) for evaluating semi-rigid fittings.

The presented data is accurate to the best of my knowledge, but as always, use it at your own risk. If you discover anything in this data that just needs to be changed, please send me an e-mail at gageguy@gagecrib.com. The most recent revision was made on January 11 2008.