What's the difference between a 10 mm and a 14 mm banger?

The width of the joint. A 10 mm male banger goes into a 10 mm female joint, and a 14 mm male banger goes into a 14 mm female joint. One won't go on the other's rig without an adapter.

What sizes do bangers come in?

The joints come in 10, 14 and 18 mm, each male or female, at 45° or 90°. The bucket has its own width, which is what decides the carb cap. Every banger here lists its joints, and its bucket width wherever the maker gives it.

Is a 14.5 mm joint the same as a 14 mm joint?

Shops use both names for the same joint. 14.5 mm is the width at the wide end of a standard taper 14 mm male joint, and 18.8 mm is the same figure for an 18 mm joint.

10, 14 and 18 mm bangers: which joint goes on which rig

Rig and banger joints by size: the names shops use, the standard taper width they match, and how many in stock use each. Updated November 9, 2026.
Joint	Also listed as	Wide end of the male joint	Bangers in stock	Rigs in stock
10 mm		10.0 mm	9	0
14 mm	14.5 mm	14.5 mm	23	48
18 mm	18.8 mm, 19 mm	18.8 mm	2	0

The widths are the standard taper sizes for ground glass joints: 10.0, 14.5 and 18.8 mm at the wide end of the male joint, from the ASTM E676 table that Scientific Machine publishes. Shops print the same joints as 14 or 14.5 mm, and as 18, 18.8 or 19 mm.

The rule for a banger and a rig

The banger's joint and the rig's joint are the same size and opposite genders. A rig with a 14 mm female joint takes a 14 mm male banger; a rig with an 18 mm male joint takes an 18 mm female banger. The angle has to match as well, which the 45 or 90 guide covers.

Male joints are ground on the outside, female joints on the inside.

Bangers here, by joint

Bangers in stock for each joint. Updated November 9, 2026.
Banger joint	Fits a rig joint	Bangers in stock	Joint page
10 mm male 90°	10 mm female	7	10 mm female joint, 90°
10 mm male 45°	10 mm female	7	10 mm female joint, 45°
10 mm female 45°	10 mm male	1
14 mm male 90°	14 mm female	19	14 mm female joint, 90°
14 mm male 45°	14 mm female	10	14 mm female joint, 45°
14 mm female 90°	14 mm male	1
14 mm female 45°	14 mm male	2
18 mm male 90°	18 mm female	2
18 mm male 45°	18 mm female	2	18 mm female joint, 45°
18 mm female 90°	18 mm male	1

Every rig here whose listing gives its joint is 14 mm, and nearly all of them are female. 14 mm male bangers are the biggest group here too.

When the sizes don't match

An adapter sits between the rig and the banger and changes the joint size. These are in stock:

10mm Joint Transition to Double 14mm Joint

$14.99

Glass Joint Size Adapter

From $5.49

The Glass Joint Size Adapter (From $5.49) comes as 14 mm to 18 mm or 10 mm to 14 mm. The 10mm Joint Transition to Double 14mm Joint ($14.99) goes into a 10 mm female joint and gives two 14 mm female joints on top, by its listing.

Joint pages

Each rig joint with three or more pieces in stock has its own page in the Fit Index, listing the bangers, catchers and caps that go with it. The table above links each one.

The male or female guide explains how to tell which gender your rig's joint is.