Scientific Machine (SciMac) is your source for High-Quality PTFE laboratory products

What does the Ts symbol stand for?

Standard Taper Ground Joints Specifications: Ts is the symbol used to designate interchangeable taper-ground joints, stoppers, adapters, stirrer bearings and sleeves. Standard taper PTFE components and ground glass joints are manufactured according to ASTM1 E 676 specifications and are finished to a precise 1:10 taper. PTFE Stopcock plugs have a 1-5 taper and are manufactured according to ASTM E 911 specification. Final machining and grinding of diameters and taper tolerances are extremely tight with a plus or minus of .05 of one millimeter to the taper portion of the PTFE component or glass joints. You can be sure SciMac parts will fit all Scientific Glassware manufacturer’s products that also adhere to these standards - order with confidence.

Ref.1 American Society of testing and Materials International https://www.astm.org

Standard Dimensions for Interchangeable Taper-Ground Joints, all dimensions are in millimeters.

Joint Size Designation

Diameter at Large End of Ground Zone

Approximate Diameter at Small End

Approximate Length of Ground Zone

7/25

7.5

5.0

25

10/30

10.0

7.0

30

12/30

12.5

9.5

30

14/35

14.5

11.0

35

19/38

18.8

15.0

38

24/40

24.0

20.0

40

29/42

29.2

25.0

42

34/45

34.5

30.0

45

40/50

40.0

35.0

50

45/50

45.0

40.0

50

50/50

50.0

45.0

50

55/50

55.0

50.0

50

60/50

60.0

55.0

50

71/60

71.0

65.0

60

103/60

103.0

97.0

60