Interchangeable Taper-Ground Joints, Stopcocks, of Commerce, National Bureau of Standards.Ĭommercial Standard CS21-58. Visit the ASTM website, or contact ASTM Customer Service atĪSTM E676-02 Standard Specification for InterchangeableĪSTM E677-02 Standard Specification for Interchangeable Spherical-Ground Joints. Interchangeable Conical Ground GlassĪSTM E675-02 Standard Specification for InterchangeableĪnnual Book of ASTM Standards volume 14.04 Discrepancies between the ISO Recommendation and the ASTM standards are currently being ironed out. There is a fourth, “international” length. As might be expected for devices intended to make a hermetic seal, a large part of the standards is devoted to gages and gauging. Short-length Taper-ground Joints Joint sizeĪ tolerance of plus 0.15 mm is allowed on inner members (such as stoppers) and minus 0.15 on outer members. Medium-length Taper-ground Joints Joint size Full-length Taper-ground Joints Joint size The standardized joint size designations were chosen so that each designation appears in only one series. The number after the slash is the length of the ground area in millimeters, measured parallel to the axis of the cone, that is, not by laying a ruler on the ground area.įour different sets of lengths have been used.The number before the slash is the diameter of the large end of the ground area. The taper is 1 in 10, the same as that of glass stoppers. The system is used to describe joints connecting glassware such as condensers and reaction vessels, but the size of such joints is given as two numbers separated by a slash, e.g., 24/40. Size is the diameter in millimeters of the large end of the Originally applied only to glassware, this system is now also used to describe stoppers made of Teflon and other materials. On a glass stopper used in laboratory equipment stands for “standard taper,” which has been standardized as a 1 in 10 taper.
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