JIS Fittings

Definition of JIS fitting adapter, JIS is Japanese Industrial Standard, adapter with 30 deg flare and 60 deg cone, JIS fittings are typically used to connect hose assembly or adapters. It is commonly used in Japanese and Korean OEM market such as excavator, loader, tractor etc.

1. Definition of JIS fitting adapter, JIS is Japanese Industrial Standard, adapter with 30 deg flare and 60 deg cone, JIS fittings are typically used to connect hose assembly or adapters. It is commonly used in Japanese and Korean OEM market such as excavator, loader, tractor etc. The threads standard is as per BSPP thread is ISO 228-1 G and JIS B 0202; BSPT thread is ISO 7/1 and JIS B 0203. JIS 60 cone adapter meet JIS B8363 specifications. Connection as below:

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2. Dimension of JIS Fitting Ends as follow:

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3. Technical information of JIS B 2351 BSP Thread Port


1. JIS Adapters Straight Union 1S

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2. JIS adapters BSPP Stud Straight 1SG

Male stud is per DIN 3852 port o-ring+retaining ring, if JIS B2351 o-ring please indicate B2351. 

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DIN 3852 port

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JIS B2351 port


3. JIS adapters UNF Stud Straight 1SO

Male stud is per SAE O-ring Boss ISO 11927 

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4. JIS adapters NPT Port Straight 1SN

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5. JIS adapters BSPT Port Straight 1ST

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6. JIS adapters female swivel 2S

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7. ORB male stud JIS female swivel 2OS

Male stud is per SAE O-ring Boss ISO 11927 

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8. NPT port JIS female swivel Elbow 2TS9-SP

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9. JIS plug 60 deg flare 4S

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10. JIS plug Swivel 60 deg seat

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11. JIS B2351 O-Ring 

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