UNF 1/4" 28G thread

It has its origin in the USA. Mainly used in chromatography/HPLC applications. Most common sizes are UNF 1/4" 28G and UNF 10 32G. The digits 28 G and 32 G stand for the number of thread pitches at a length of one inch (25.4 mm).

UNF 1/4" 28G versus M 6

Without exception all BOLA HPLC fittings come with the most common HPLC thread UNF 1/4" 28G. In addition, fittings and distributors with the very similar thread M 6 are used. These threads can only be distinguished by exact determination of their outer diameter or by using a test mandrel (it is possible to screw in a tube end fitting in the counterpart of the other thread for at least 2-3 rotations). The UNF 1/4" thread has an outer diameter of 6.35 mm, the M 6 thread has precisely 6 mm (work tolerances are possible). We recommend to use only the UNF 1/4"-28 G thread to avoid confusion and double inventory.




In 2020, Bohlender launched the new product line "b.safe". This brand name stands for professional safety solutions in the HPLC...
GRUENSFELD. Eugen Hellinger has been working at the BOHLENDER GmbH for 30 years now for which he was honoured from Managing Director...

BOLA catalogue

Order your free catalogue!

Know what's on

Subscribe for the BOLA newsletter now and receive regular information about the lab.

Made to Measure

You need a desiccator which is not in our standard product range? No problem – simply send a sketch.