Item Type: Adapter Fitting - Male O-ring Boss X Female O-ring Boss
Nominal Size: 5/8 Male O-ring Boss X 1/2 Female O-ring Boss
Material: Plated Steel

Alternate Part numbers:

Aeroquip: FF1010-10-8S
Parker: 10-8 F50G5-S
Weather Head: C7033X10X8

SAE O-RING BOSS THREAD CHART - THREAD SIZE MEASUREMENT TAKEN FROM OUTSIDE DIAMETER OF MALE THREADS
SAE O-Ring Boss fittings seal with an o-ring at the base of the male fitting against a chamfered area on the female port.  SAE O-ring boss is typically seen in porting appications such as cylinders, pumps, motors, and valves.  Thread pitch is the same as JIC 37 degree flare in all sizes.
 Tube Size (Nominal Size)
 Dash Size 
 Thread Size 
 O-Ring 
1/8"
- 2
5/16" - 24
2-902/N9
3/16"
- 3
3/8" - 24
2-903/N9
1/4"
- 4
7/16" - 20
2-904/N9
5/16"
- 5
1/2" - 20
2-905/N9
3/8"
- 6
9/16" - 18
2-906/N9
1/2"
- 8
3/4" - 16
2-908/N9
5/8"
- 10
7/8" - 14
2-910/N9
3/4"
- 12
1-1/16" - 12
2-912/N9
7/8"
- 14
1-3/16" - 12
2-914/N9
1"
- 16
1-5/16" - 12
2-916/N9
1-1/4"
- 20
1-5/8" - 12
2-920/N9
1-1/2"
- 24
1-7/8" - 12
2-924/N9
2"
- 32
2-1/2" - 12
2-932/N9