Lab Glassware · Flasks

Round Bottom Flask, Multi-Neck

Available sizes: 50–20000 ml

6 variants and 144 sizes listed below with dimensions, joint sizes and tolerances, as per the manufacturer's current catalogue. Borosilicate 3.3 glass, supplied with COA on request. Prices are by quotation — tell us the sizes and quantities you need.

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Round Bottom Flask — 2 Necks, Angular Round Bottom Flask — 2 Necks, Parallel Round Bottom Flask — 3 Necks, Angular Round Bottom Flask — 3 Necks, Parallel Round Bottom Flask — 4 Necks, Angular Round Bottom Flask — 4 Necks, Parallel

Round Bottom Flask

2 Necks, Angular

With Interchangeable Joints
One neck is centred and vertical. The side neck is inclined at an angle of 20° to the vertical neck
Uniform wall thickness distribution and the round-bottom shape make them ideal for heating
The shape facilitates uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc., can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Interchangeable Joint Size Centre Neck	Side Neck
100	19 / 26	14 / 23
100	24 / 29	14 / 23
100	24 / 29	19 / 26
250	24 / 29	14 / 23
250	24 / 29	19 / 26
500	24 / 29	14 / 23
500	24 / 29	19 / 26
1000	24 / 29	14 / 23
1000	24 / 29	19 / 26
2000	24 / 29	14 / 23
2000	24 / 29	19 / 26
2000	34 / 35	19 / 26
3000	34 / 35	19 / 26
3000	34 / 35	24 / 29
5000	34 / 35	19 / 26
5000	34 / 35	24 / 29
10000	34 / 35	24 / 29
10000	55 / 44	24 / 29
20000	55 / 44	24 / 29

Round Bottom Flask

2 Necks, Parallel

With Interchangeable Joints
Both the necks are vertical. One neck is centred, while the other is the side neck
Uniform wall thickness distribution and the round-bottom shape make them ideal for heating
The shape facilitates uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc., can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Interchangeable Joint Size Centre Neck	Side Neck
100	19 / 26	14 / 23
100	24 / 29	14 / 23
100	24 / 29	19 / 26
250	24 / 29	14 / 23
250	24 / 29	19 / 26
500	24 / 29	14 / 23
500	24 / 29	19 / 26
1000	24 / 29	14 / 23
1000	24 / 29	19 / 26
2000	24 / 29	14 / 23
2000	24 / 29	19 / 26
2000	34 / 35	19 / 26
3000	34 / 35	19 / 26
3000	34 / 35	24 / 29
5000	34 / 35	19 / 26
5000	34 / 35	24 / 29
10000	34 / 35	24 / 29
10000	55 / 44	24 / 29
20000	55 / 44	24 / 29

Round Bottom Flask

3 Necks, Angular

With Interchangeable Joints
The centred neck is vertical. The two side necks are 180° apart and are inclined at an angle of 20° to the vertical neck
Uniform wall thickness distribution and round-bottom shape make them ideal for heating
The shape facilitates uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc. can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Centre Neck	Interchangeable Joint Size Side Neck	Side Neck
100	19 / 26	14 / 23	14 / 23
100	14 / 23	14 / 23	14 / 23
100	24 / 29	14 / 23	14 / 23
100	24 / 29	19 / 26	19 / 26
250	19 / 26	14 / 23	14 / 23
250	19 / 26	19 / 26	19 / 26
250	24 / 29	14 / 23	14 / 23
250	24 / 29	19 / 26	19 / 26
500	19 / 26	14 / 23	14 / 23
500	19 / 26	19 / 26	19 /26
500	24 / 29	14 / 23	14 / 23
500	24 / 29	19 / 26	19 /26
1000	24 / 29	14 / 23	14 / 23
1000	24 / 29	19 / 26	19 / 26
1000	34 / 35	24 / 29	24 / 29
1000	34 / 35	19 / 26	19 / 26
2000	24 / 29	14 / 23	14 / 23
2000	24 / 29	19 / 26	19 / 26
2000	34 / 35	19 / 26	19 / 26
2000	34 / 35	24 / 29	24 / 29
3000	34 / 35	19 / 26	19 / 26
3000	34 / 35	24 / 29	24 / 29
5000	34 / 35	19 / 26	19 / 26
5000	34 / 35	24 / 29	24 / 29
5000	45 / 40	24 / 29	24 / 29
10000	34 / 35	19 / 26	19 / 26
10000	34 / 35	24 / 29	24 / 29
10000	45 / 40	24 / 29	24 / 29
20000	55 / 44	24 / 29	24 / 29

Round Bottom Flask

3 Necks, Parallel

With Interchangeable Joints
All the three necks are vertical. The two side necks are 180° apart
Uniform wall thickness distribution and round-bottom shape make them ideal for heating
The shape facilitates uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc. can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Centre Neck	Interchangeable Joint Size Side Neck	Side Neck
100	19 / 26	14 / 23	14 / 23
100	14 / 23	14 / 23	14 / 23
100	24 / 29	14 / 23	14 / 23
100	24 / 29	19 / 26	19 / 26
250	19 / 26	14 / 23	14 / 23
250	19 / 26	19 / 26	19 / 26
250	24 / 29	14 / 23	14 / 23
250	24 / 29	19 / 26	19 / 26
500	19 / 26	14 / 23	14 / 23
500	19 / 26	19 / 26	1 9 /26
500	24 / 29	14 / 23	14 / 23
500	24 / 29	19 / 26	19 /26
1000	24 / 29	14 / 23	14 / 23
1000	24 / 29	19 / 29	19 / 26
1000	34 / 35	24 / 29	24 / 29
1000	34 / 35	19 / 26	19 / 26
2000	24 / 29	14 / 23	14 / 23
2000	24 / 29	19 / 26	19 / 26
2000	34 / 35	19 / 26	19 / 26
2000	34 / 35	24 / 29	24 / 29
3000	34 / 35	19 / 26	19 / 26
3000	34 / 35	24 / 29	24 / 29
5000	34 / 35	19 / 26	19 / 26
5000	34 / 35	24 / 29	24 / 29
5000	45 / 40	24 / 29	24 / 29
10000	34 / 35	19 / 26	19 / 26
10000	34 / 35	24 / 29	24 / 29
10000	45 / 40	24 / 29	24 / 29
20000	55 / 44	24 / 29	24 / 29

Round Bottom Flask

4 Necks, Angular

With Interchangeable Joints
The centred neck is vertical. All the three side necks are inclined at an angle of 20° to the vertical neck
The two side necks are 180° apart, and a third side neck is at 90° from the other two necks
Uniform wall thickness distribution and round-bottom shape make them ideal for heating
The shape facilitates uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc. can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Interchangeable Joint Size Centre Neck	Side Neck
50	24 / 29	24 / 29
100	24 / 29	14 / 23
100	24 / 29	19 / 26
250	24 / 29	14 / 23
250	24 / 29	19 / 26
500	24 / 29	14 / 23
500	24 / 29	19 / 26
500	24 / 29	24 / 29
500	34 / 35	24 / 29
1000	24 / 29	14 / 23
1000	24 / 29	19 / 26
1000	24 / 29	24 / 29
1000	34 / 35	24 / 29
2000	24 / 29	14 / 23
2000	24 / 29	19 / 26
2000	34 / 35	19 / 26
2000	34 / 35	24 / 29
3000	34 / 35	19 / 26
3000	34 / 35	24 / 29
5000	34 / 35	19 / 26
5000	34 / 35	24 / 29
10000	55 / 44	24 / 29
10L	34 / 35	24 / 29
20000	55 / 44	24 / 29

Round Bottom Flask

4 Necks, Parallel

With Interchangeable Joints
All the four necks are vertical. The two side necks are 180° apart and the third neck is at 90° from the other two necks
Four Necks, Centre Neck and Three Parallel Side Neck, with Interchangeable Joints
Uniform wall thickness distribution and the round-bottom shape make them ideal for heating
The shape facilities uniform heating
Accessories, thermometer, column, dropping funnels, boiling capillaries, etc. can be fitted depending upon the application
Generally used in distillation and extraction processes

Capacity (ml)	Interchangeable Joint Size Centre Neck	Side Neck
50	24 / 29	24 / 29
100	24 / 29	14 / 23
100	24 / 29	19 / 26
250	24 / 29	14 / 23
250	24 / 29	19 / 26
500	24 / 29	14 / 23
500	24 / 29	19 / 26
500	24 / 29	24 / 29
500	34 / 35	24 / 29
1000	24 / 29	14 / 23
1000	24 / 29	19 / 26
1000	24 / 29	24 / 29
1000	34 / 35	24 / 29
2000	24 / 29	14 / 23
2000	24 / 29	19 / 26
2000	34 / 35	19 / 26
2000	34 / 35	24 / 29
3000	34 / 35	19 / 26
3000	34 / 35	24 / 29
5000	34 / 35	19 / 26
5000	34 / 35	24 / 29
10000	55 / 44	24 / 29
10000	34 / 35	24 / 29
20000	55 / 44	24 / 29