The 2J is a straight hydraulic adapter with a JIC male 74° cone on one end and a JIC female 74° seat swivel nut on the other. It is used to join a fixed male JIC tube end to a female JIC port or hose fitting in a straight inline run. This guide covers the thread standard, sizes, pressure ratings, part number format and common applications for the 2J series.
What Is the 2J Straight JIC Male / JIC Female Adapter?
The 2J is a forged straight adapter. One port has a male JIC 37° flare cone. The other port has a female JIC swivel nut with a 74° included seat angle. The swivel nut lets the adapter align with the mating port without twisting the tube or hose assembly.
The 2J follows SAE J514 and ISO 8434-2 geometry. It is dimensionally interchangeable with major brands such as Parker, Eaton, Aeroquip and Gates. Ruihua hardware manufactures the 2J from C45 carbon steel and pressure-tests each piece before packing.
Key Features of the 2J Adapter
Forged C45 / AISI 1045 carbon steel body for high burst strength.
Trivalent zinc plating with chromate seal — passes 96 h neutral salt spray (ASTM B117).
Precision-machined JIC 37° flare male cone and 74° female swivel seat.
UNF parallel threads to SAE J514 / ISO 8434-2.
Swivel nut design allows easy alignment and reduces assembly stress.
100% pressure tested before delivery.
Stainless steel 316 and OEM marking available on request.
2J Specifications and Sizes
Part Number
Male JIC Thread
Female JIC Thread
Tube OD
Working Pressure (PSI)
Material
2J-04
7/16-20 UNF
7/16-20 UNF
1/4"
5000
Carbon steel, zinc plated
2J-06
9/16-18 UNF
9/16-18 UNF
3/8"
5000
Carbon steel, zinc plated
2J-08
3/4-16 UNF
3/4-16 UNF
1/2"
4500
Carbon steel, zinc plated
2J-10
7/8-14 UNF
7/8-14 UNF
5/8"
4500
Carbon steel, zinc plated
2J-12
1-1/16-12 UNF
1-1/16-12 UNF
3/4"
4000
Carbon steel, zinc plated
2J-16
1-5/16-12 UNF
1-5/16-12 UNF
1"
3500
Carbon steel, zinc plated
2J-20
1-5/8-12 UNF
1-5/8-12 UNF
1-1/4"
2500
Carbon steel, zinc plated
2J-24
1-7/8-12 UNF
1-7/8-12 UNF
1-1/2"
2500
Carbon steel, zinc plated
Working temperature range: -30 °C to +120 °C with standard NBR seals. FKM (Viton) seals are available for high-temperature or synthetic fluid service.
2J Part Number Breakdown
The 2J-08 format reads as follows:
2J — body style: straight adapter, JIC male / JIC female swivel.
-08 — dash size that defines both the male and female JIC thread and the matching tube outside diameter.
Most 2J adapters are equal-size. Reducing configurations, such as 2J-08-06, can be produced on request when one port must match a larger or smaller JIC size.
Common Applications for the 2J Adapter
The 2J is used wherever a straight JIC connection needs a swivel alignment or a male-to-female transition. Typical applications include:
Extending or adapting JIC ports on hydraulic cylinders and valve blocks.
Connecting a fixed JIC tube assembly to a female JIC hose fitting.
Inline repairs on agricultural tractors, excavators and loaders.
Power units and pump stations where hoses meet steel tube lines.
Industrial presses, injection moulding machines and factory automation lines.
How the 2J Compares to Similar JIC Adapters
Adapter
Ends
Typical Use
2J (this article)
JIC male / JIC female straight
Inline male-to-female JIC connection with swivel alignment
The 2J has a JIC male 37° flare on one end and a JIC female 74° seat swivel nut on the other. It connects a fixed male JIC tube end to a female JIC port or hose fitting in a straight inline run.
What thread standard does the 2J adapter follow?
The 2J follows SAE J514 and ISO 8434-2 for JIC 37° flare fittings. Threads are UNF (Unified National Fine) parallel threads. The 74° in the product name refers to the included seat angle of the female swivel seat.
What is the working pressure of the 2J adapter?
Working pressure follows standard JIC 37° flare ratings by size. A 1/4 inch 2J adapter is rated around 5000 PSI, a 1/2 inch adapter around 4500 PSI, and a 1-1/4 inch adapter around 2500 PSI. Ruihua hardware pressure-tests every adapter before shipment.
Is the 2J interchangeable with Parker or Aeroquip adapters?
Yes. The 2J matches the body geometry, thread and seat dimensions of Parker straight JIC male / female adapters, Aeroquip 2020 series and Eaton standard JIC unions. It is a direct dimensional cross for field repairs and new assemblies.
Can I order stainless steel or OEM-marked 2J adapters?
Yes. Ruihua hardware supplies the 2J in carbon steel with trivalent zinc plating as standard. Stainless steel 316, custom lengths, laser marking and bulkhead versions are available on request for marine, food-grade and OEM applications.
Send Ruihua hardware the dash size, quantity and destination port and the sales team will reply within one working day with a FOB Ningbo quotation. OEM marking, stainless steel 316 and reducing sizes are available on request.
Lynn Liu is a Senior Foreign Trade Specialist at Ruihua Hardware with over 10 years of experience in hydraulic fittings export. She helps global buyers source reliable, cost-effective, and application-ready hydraulic connection solutions from China.
