Thread Identification Our guide to identifying the most common threads

BSP Thread Identification

British Standard Pipe (BSP)

Also referred to as Whitworth threads, the BSP thread type fittings seal using metal to metal angled surfaces or a combination of metal to metal and an O-ring. The angle of the sealing surfaces is 60° for both forms.
There are two popular thread forms, British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT).

Identification is made by measuring the outside diameter of the thread and the number of threads per inch (25.4 mm)

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JIC Thread Identification

JIC - Joint Industry Council Thread - SAE JIC 37°

Commonly referred to as just JIC fittings these metal to metal sealing type fittings have a 37° flare (sealing surface angle) and straight United National Fine straight Threads (UNF).
The original design specification for the fittings comes from the Society of Automotive Engineers (SAE) and these fittings are the most common American fitting type in Europe.

Standard:
ISO 12151-5, ISO8434-2 and SAE J516

The most commonly found sizes on hydraulic hose are below:
1/4" hose - 9/16" JIC
3/8" hose - 9/16" JIC / 3/4" JIC
1/2" hose - 7/8" JIC
3/4" hose - 1.1/16" JIC
1" hose - 1.5/16" JIC

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Metric Thread

DIN 24° Light (L) and Heavy Series (S) with O-ring

The male has a 24° sealing angle cone seat with straight metric threads.
The female has a 24° convex cone with O-ring and a swivel straight metric threaded nut.

Standard:
ISO 12151-2 / ISO 8434-1 & ISO 8434-4

The most commonly found sizes on hydraulic hose are below:
1/4" hose - 10L Metric
3/8" hose - 12L Metric
1/2" hose - 15L Metric
3/4" hose - 22L Metric
1" hose - 28L Metric

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ORFS Thread

O-ring Face Seal (ORFS)

ORFS fittings are becoming the most popular international fitting type used on global OEM machines due to their high level of sealing and their good vibration resistance. The fittings use the O-ring compression mechanism to seal.
The female fittings have flat faces and straight threaded UNF swivel nuts. The male fittings have the O-ring in a groove in the flat face.
Seen as a major advantage, these fittings offer the possibility to build the hose assemblies into fixed distances/spaces, without having to move back other system components due the flat faces of the male and female fittings - the hose assembly can be slotted in.

Standard
ISO 12151-1, ISO8434-3 and SAE J516

The most commonly found sizes on hydraulic hose are below:
1/4" hose - 9/16" ORFS
3/8" hose - 11/16" ORFS
1/2" hose - 13/16" & 1" ORFS
3/4" hose - 1.3/16" ORFS
1" hose - 1.7/16" ORFS

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Flange Thread

Code 61 Type

The 4-bolt split flange (or full flange) fitting is used worldwide for connecting high pressure hoses typically to pumps, motors and cylinders, where the hose assemblies are subjected to large pressure loadings.
The sealing mechanism is through compression of the O-ring in the face of the flange head against the surface of the port/ connection.
The flange fittings are generally separated into two pressure classes referred to as 3000 psi (SFL) or 6000 psi (SFS).
ISO 12151-3 refers to the flange fittings as code 61 for the 3000 psi and code 62 for the 6000 psi.
In addition to these flanges, customer specific Komatsu® and CATERPILLAR® flanges can also be found in the market.

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Flange Thread

Code 62 Type

The 4-bolt split flange (or full flange) fitting is used worldwide for connecting high pressure hoses typically to pumps, motors and cylinders, where the hose assemblies are subjected to large pressure loadings.
The sealing mechanism is through compression of the O-ring in the face of the flange head against the surface of the port/ connection.
The flange fittings are generally separated into two pressure classes referred to as 3000 psi (SFL) or 6000 psi (SFS).
ISO 12151-3 refers to the flange fittings as code 61 for the 3000 psi and code 62 for the 6000 psi.
In addition to these flanges, customer specific Komatsu® and CATERPILLAR® flanges can also be found in the market.

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