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Syringe specifications and matching needles
Nov 19, 2018

1. Structure and specifications of the syringe The structure of the syringe includes a nipple, an empty cylinder, a piston, a piston shaft, and a piston handle (10-1). The specifications are 1, 2, 5, 10, 20, 30, 50, and 100 ml.

2. Structure and specification of the needle The needle consists of a needle tip, a needle stem and a needle plug (Fig. 10-1). The commonly used models are 4.5, 5, 5.5, 6, 6.5, 7, 8, 9.

Syringe and needle construction


3. Specifications and uses of various syringes and needles.

Specifications and uses of syringes and needles

Subcutaneous injection 1ml 4.5~5

Intramuscular injection 2.5ml 5.5~6

Intravenous injection, venous blood collection 2.5ml 10ml 6.5~7 5 10 20 50ml 6, 7,8,9

The thickness of the needle is indicated by a few numbers, generally there are 4.5, 5, 6, 7 and so on.

No. 7 is the diameter of the needle is 0.7 mm (may be the outer diameter)

Ordinary children use 4.5 or 5th. Adults use the 7th.



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