Syringe size really does matter

[GREENMACHINE]

Needle....Nominal O.D.
Gauge.....mm........inches.
10..........3.404.....0.1340
11..........3.048.....0.1200
12..........2.769.....0.1090
13..........2.413.....0.0950
14..........2.108.....0.0830
15..........1.829.....0.0720
16..........1.651.....0.0650
17..........1.473.....0.0580
18..........1.270.....0.0500
19..........1.067.....0.0420
20..........0.902.....0.0355
21..........0.813.....0.0320
22..........0.711.....0.0280
22s.........0.711.....0.0280
23..........0.635.....0.0250
24..........0.559.....0.0220
25..........0.508.....0.0200
25s.........0.508.....0.0200
26..........0.457.....0.0180
26s.........0.467.....0.0184
27..........0.406.....0.0160
28..........0.356.....0.0140
29..........0.330.....0.0130
30..........0.305.....0.0120
31..........0.254.....0.0100
32..........0.229.....0.0090
33..........0.203.....0.0080
__________________

[Assapopolis]

[toofatbuilder]

thank god im not the only one.....lol

[C_Bino]

Ya, I got no idea what is going on here either...

[GREENMACHINE]

The first figure is the one that most concerns you. An 18g needles has an edge to edge width of 1.270mm. A 25g is 0.508mm edge to edge. First impression would suggest that an 18g is approx 2.5 as big as a 25g needle. It is actually leaves closer to 6.25 times a bigger puncture in your skin.

Remember how to find the area of a cirle Pi(R)squared. so we need to square the radius of both to compare them correctly.

When you puncture your skin the size of hole is relative to the size of the needle. The needle makes a circular puncture in your skin

[GREENMACHINE]

Okay I've toned it down, to the bare basics. I have a lot of experience regard specifications, tolerances, conrol limits etc. I understood the info I posted, I forget sometimes that, this isn't stuff everyone understands.

[C_Bino]

Oh ok I see now. Thanks for the info. Regardless though I will continue to use the same way. Always worked out well.

[GREENMACHINE]

I'm thinking in terms of newbies who want to know if it okay to use an 18g instead of a 23g. I don't expect experience bro's to take anything from because they have enough sense to know which needle to use. I was trying to display numerical that there really is a sizeable difference between different gauges of needles.