Tool 04

Joint size finder.

NS 24/29 means a ground cone 24 mm wide at the large end and 29 mm long, on a 1:10 taper. Two pieces mate only when both numbers match. Check yours below.

Piece 1 (e.g. flask socket)

Piece 2 (e.g. condenser cone)

◐ ADAPTER NEEDED — NS 24/29 and NS 14/23 do not mate directly. Bridge them with VTN-311 (reduction adapter).

Selected: NS 24/29

The workhorse: RBFs, condensers, adapters (EU pattern)

Code	Ø large end	Length	Typical use
NS 7/16	7.5 mm	16 mm	Micro flasks, micro stoppers
NS 10/19	10 mm	19 mm	Small volumetric flasks, thermometer pockets
NS 12/21	12.5 mm	21 mm	50 mL volumetric flasks, small adapters
NS 14/23	14.5 mm	23 mm	Thermometer sockets, 50–100 mL flasks, micro-scale kits
NS 19/26	18.8 mm	26 mm	Mid-size flasks, separating funnels, UK-pattern kits
NS 24/29	24 mm	29 mm	The workhorse: RBFs, condensers, adapters (EU pattern)
NS 29/32	29.2 mm	32 mm	Large flasks, iodine flasks, sep funnels (EU large)
NS 34/35	34.5 mm	35 mm	Wide-mouth reagent bottles, large heads
NS 45/40	45 mm	40 mm	Wide-mouth storage, resin kettles
NS 60/46	60 mm	46 mm	Very wide bottles, desiccator taps