Shop High Pressure Type M Caps

The Type M Caps OneXtreme Adapters are ultra-high-pressure protective fittings designed to seal and protect unused Type M (Reverse High Pressure) connections in hydraulic, chemical injection, and high-pressure fluid systems. Designed for use with Type M swivel hose end fittings, these caps utilize a precision 58-degree cone seal to create a secure metal-to-metal connection capable of handling working pressures up to 50,000 psi (3447 bar).


Manufactured from cold worked 316 stainless steel, these Type M caps provide exceptional strength, corrosion resistance, and durability in harsh operating environments while helping protect critical sealing surfaces from contamination, moisture intrusion, and physical damage during operation, maintenance, storage, or transport. OneXtreme Type M caps are precision machined for consistent fit and sealing integrity, with special materials available upon request to meet specific application or environmental requirements. 

Warning: Proper cone angle compatibility, thread engagement, and installation torque are critical. Damaged sealing surfaces, improper assembly, or exceeding system limits can result in leaks or catastrophic failure; always verify compatibility with mating components and follow recommended installation procedures before use.

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High Pressure Adapters

Up to 40,000psi (varies by size)

9/16" to 1-1/4" 

316 Stainless Steel (Customs available upon Request)

Click HERE to view the OneXtreme Catalog

Click HERE to view the entire High Pressure Type M Cap Collection

Series 700, Female Type M

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 Type M Side Pressure Rating Lead Time Price
X9TMCAP40-K 0.5625 (9/16") 40000 4-6 Weeks $39.43
X12TMCAP30-K 0.75 (3/4") 30000 4-6 Weeks $52.54
X14TMP40 0.875 (7/8") 40000 4-6 Weeks $29.55
X16TMCAP30-K 1 30000 4-6 Weeks $54.89
X21TMCAP20-K 1.3125 (1-5/16") 20000 4-6 Weeks $118.49
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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.