Hamilton Company | Hamilton Syringes | Technical Information

Gauge Index

When selecting a needle gauge it is important to keep in mind the volume of the syringe and the dead volume of the needle. For example, it will be very difficult to prime a 10 µL syringe if the dead volume in the needle is greater than 10 µL. Refer to the gauge index to choose a needle gauge with an appropriate µL/inch before selecting a needle. Select the minimum length that allows you to carry out your application comfortably.

Note: The ‘s’ on a 22s needle represents a smaller I.D. (inner diameter) for the needle and a thicker needle wall for better durability. For example, a 26 gauge needle has an O.D. (outer diameter) of 0.46 mm and an I.D. of 0.26 mm while the 26s gauge needle has an O.D. of 0.47 mm and an I.D. of 0.13 mm. The 26s has half the I.D. of the 26 gauge needle. Also, the difference in the wall thickness nearly doubles with 26s gauge having a thickness of 0.18 mm while the 26 gauge is only 0.10 mm.

	Nominal O.D.		Nominal I.D.		Wall Thickness		Volume
Gauge	Inch	mm*	Inch	mm*	Inch	mm*	µL/Inch

34	0.0060 - 0.0065	0.159	0.0015 - 0.0025	0.051	0.004	0.11	0.052

33	0.0080 - 0.0085	0.210	0.0035 - 0.0050	0.108	0.004	0.10	0.233

32	0.0090 - 0.0095	0.235	0.0035 - 0.0050	0.108	0.005	0.13	0.233

31	0.0100 - 0.0105	0.261	0.0045 - 0.0060	0.133	0.005	0.13	0.353

30	0.0120 - 0.0125	0.312	0.0055 - 0.0070	0.159	0.006	0.15	0.504

29	0.0130 - 0.0135	0.337	0.0065 - 0.0080	0.184	0.006	0.15	0.675

28	0.0140 - 0.0145	0.362	0.0065 - 0.0080	0.184	0.007	0.18	0.675

27	0.0160 - 0.0165	0.413	0.0075 - 0.0090	0.210	0.008	0.20	0.876

26s	0.0184 - 0.0189	0.474	0.0045 - 0.0055	0.127	0.014	0.35	0.322

26	0.0180 - 0.0185	0.464	0.0095 - 0.0110	0.260	0.008	0.20	1.349

25s	0.0200 - 0.0205	0.515	0.0055 - 0.0065	0.153	0.014	0.36	0.464

25	0.0200 - 0.0205	0.515	0.0095 - 0.0110	0.260	0.010	0.25	1.349

24	0.0220 - 0.0225	0.566	0.0115 - 0.0130	0.311	0.010	0.25	1.930

23s	0.0250 - 0.0255	0.642	0.0040 - 0.0051	0.116	0.021	0.53	0.268

23	0.0250 - 0.0255	0.642	0.0125 - 0.0140	0.337	0.012	0.30	2.266

22s	0.0280 - 0.0285	0.718	0.0055 - 0.0077	0.168	0.022	0.55	0.563

22	0.0280 - 0.0285	0.718	0.0155 - 0.0170	0.413	0.012	0.30	3.403

21	0.0320 - 0.0325	0.819	0.0195 - 0.0210	0.514	0.012	0.30	5.271

20	0.0355 - 0.0360	0.908	0.0230 - 0.0245	0.603	0.012	0.30	7.255

19	0.0415 - 0.0425	1.067	0.0255 - 0.0285	0.686	0.015	0.38	9.389

18	0.0495 - 0.0505	1.270	0.0315 - 0.0345	0.838	0.017	0.43	14.011

17	0.0575 - 0.0585	1.473	0.0405 - 0.0435	1.067	0.016	0.41	22.715

16	0.0645 - 0.0655	1.651	0.0455 - 0.0485	1.194	0.018	0.46	28.444

15	0.0715 - 0.0725	1.829	0.0525 - 0.0555	1.372	0.018	0.46	37.529

14	0.0820 - 0.0840	2.109	0.0610 - 0.0650	1.600	0.020	0.51	51.076

13	0.0940 - 0.0960	2.413	0.0690 - 0.0730	1.804	0.024	0.61	64.895

12	0.1080 - 0.110	2.769	0.0830 - 0.0870	2.159	0.024	0.61	93.000

11	0.1190 - 0.1210	3.048	0.0920 - 0.0960	2.388	0.026	0.66	113.728

10	0.1330 - 0.1350	3.404	0.1040 - 0.1080	2.693	0.028	0.71	144.641

*mm are nominal

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