Shop High Pressure JIC Caps

The JIC Caps OneXtreme Adapters are precision-engineered protective fittings designed to seal and protect unused JIC 37° flare connections in hydraulic and fluid power systems. JIC (Joint Industry Council) fittings utilize a 37-degree cone seat to create a dependable metal-to-metal seal without the need for additional sealing compounds, making them ideal for applications with working pressures up to 15,000 psi (689 bar).


Manufactured from cold worked 316 stainless steel, these JIC caps provide exceptional strength, corrosion resistance, and durability in demanding industrial, mobile equipment, and chemical processing environments. OneXtreme JIC caps help prevent contamination, moisture intrusion, and damage to critical sealing surfaces during operation, maintenance, storage, or transport, with special materials available upon request to meet specific application requirements.

Warning: Proper thread and flare compatibility are critical. Using damaged or mismatched components may compromise sealing performance and system integrity; always verify correct sizing and do not exceed recommended pressure or installation guidelines.

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High Pressure Adapters

Up to 10,000psi (varies by size)

1/4" to 1" 

316 Stainless Steel (Customs available upon Request)

Click HERE to view the OneXtreme Catalog

Click HERE to view the entire High Pressure JIC Cap Collection

Series 700, Female JIC

Click on the model number in the chart below to view that adapter. 

ALL ADAPTERS SHOWN BELOW ARE 316 STAINLESS, MADE IN USA.

Product SKU Female JIC Side Pressure Rating Lead Time Price
X4JCAP15 0.25 (1/4") 15000 4-6 Weeks $52.25
X6JCAP15 0.375 (3/8") 15000 4-6 Weeks $53.14
X8JCAP15 0.5 (1/2") 15000 4-6 Weeks $61.94
X10JCAP10 0.625 (5/8") 10000 4-6 Weeks $61.94
X12JCAP10 0.75 (3/4") 10000 4-6 Weeks $64.88
X16JCAP10 1 10000 4-6 Weeks $79.55
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Technical Specs




Still need help? Give us a call at 281.941.2310 or email us at sales@onehydraulics.com for technical support.