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Thread Size Chart

Click here for a guide on how to properly measure threads.

Thread Chart
Dash Size:
2 3 4 5 6 7 8 10 12 14 16 20 24 32 40 48
Tube
O.D.
1/8 3/16 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/4 1-1/2 2 2-1/2 3
Hose
I.D.
1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2 2-1/2 3
JIC 37
Flare Thread
5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 3/4-16 7/8-14 1-1/16-12 1-3/16-12 1-5/16-12 1-5/8-12 1-7/8-12 2-1/2-12 3-12 3-1/2-12
SAE O-Ring
Thread
5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 3/4-16 7/8-14 1-1/16-12 1-3/16-12 1-5/16-12 1-5/8-12 1-7/8-12 2-1/2-12
NPTF Pipe
Thread
1/8-27 1/4-18 3/8-18 1/2-14 3/4-14 1-11-1/2 1-1/4-11-1/2 1-1/2-11-1/2 2-11-1/2 2-1/2-8 3-8
NPSM Swivel
Thread
1/8-27 1/4-18 3/8-18 1/2-14 3/4-14 1-11-1/2 1-1/4-11-1/2 1-1/2-11-1/2 2-11-1/2
Flat Face
Thread
9/16-18 11/16-18 13/16-18 1-14 1-3/16-12 1-7/16-12 1-11/16-2 2-12
Code 61 Flange
Head O.D.
1.19 1.335 1.50 1.75 2.00 2.38 2.81 3.31 4.00
Code 62 Flange
Head O.D.
1.25 1.62 1.88 2.12 2.50 3.12
British Thread
BSPP/BSPT
1/8-28 1/4-19 3/8-19 1/2-14 3/4-14 1-11 1-1/4-11 1-1/2-11
Metric
Thread
10
M10x1.0
12
M14x1.5
14
M16x1.5
16
M16x1.5
18
M18x1.5
20
M20x1.5
22
M22x1.5
24
M24x1.5
26
M26x1.5
27
M27x2.0
30
M30x2.0
33
M33x2.0
36
M36x2.0
42
M42x2.0
48
M48x2.0


Copper/Nylon
Air Brake Thread
7/16-24 17/32-24 11/16-20 13/16-18 1-18
SAE 45
Flare Thread
5/16-24 3/8-24 7/16-20 1/2-20 5/8-18 11/16-24 3/4-16 7/8-14 1-1/16-14
Inverted
Flare Thread
5/16-28 3/8-24 7/16-24 1/2-20 5/8-18 11/16-18 3/4-18 7/8-18 1-1/16-16
Compression
Thread
5/16-24 3/8-24 7/16-24 1/2-24 9/16-24 5/8-24 11/16-24 13/16-18 1-18

What is the "(+.18)" beside the item number I want to order in the drop down menu? ?