Page 368 - BOLA Catalogue

Determination – Thread Types
Nalgene Threads
The US-based company Nalgene produces amongst others plastic containers and flasks for storing che- micals. Especially Nalgene carboys are widely-used in laboratories. Nalgene threads can be recognized by their high collar on the buttress thread.
Example:
Nalgene B53 – O. D. = 54,0 mm
TECHNICAL INFORMATION
Pitch
5mm
Thread
Type
O. D.
mm
Pitch
mm
Nalgene B53
Typ 2
54,0
6,0
Nalgene B83
Typ 2
88,0
12,7
GPI Threads
The abbreviation GPI stands for Glass Packaging Institute, the trade association representing the North American glass container industry. The GPI sets voluntary standards, i. e. they are defined as an basis to achieve interchangeability and compatibility of glass containers and their respective closures.
Example:
GPI 33– O. D. = 31,8 mm
UNF 1/4" 28G thread
It has its origin in the USA. Mainly used in chromatography / HPLC appli- cations. 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.
Example:
UNF 1/4"-28G – O. D. = 6,2 mm Pitch
28 turns at1"=0,91mm
Pitch
3 mm
Thread
Type
O. D.
mm
Pitch
mm
GPI 33
Typ 2
31,8
3,0
GPI 38
Typ 1
37,05
4,0
Thread
Type
O. D.
mm
Pitch
mm
UNF
1/4" 28G
6,2
28 turns at 1" = 0,91
UNF
3/8" 24G
9,4
24 turns at 1" = 1,06
UNF
1/2" 20G
12,6
20 turns at 1" = 1,27
UNF
5/8" 18G
15,7
18 turns at 1" = 1,41
UNF
3/4" 16G
18,9
16 turns at 1" =1,59
UNF
1" 12G
25,2
12 turns at 1" = 2,12
By the way: BOLA offers custom manufacture. From 1 piece. Hotline +49 (0) 93 46-92 86-0
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