SAE Hydraulic Components

What Are SAE Hydraulic Components?

SAE hydraulic components are designed and manufactured to specifications established by SAE International (formerly the Society of Automotive Engineers). These standards ensure:

Interchangeability: Components from different manufacturers fit and function together

Performance consistency: Predictable pressure ratings, flow characteristics, and durability

Safety margins: Tested and verified pressure ratings with established safety factors

Global acceptance: Recognized worldwide in mobile equipment, industrial machinery, and aerospace applications

The problem: Hydraulic systems often mix components from multiple suppliers. Without standardized interfaces, mismatched ports, flanges, and mounting patterns create leaks, assembly headaches, and performance issues. SAE standards eliminate this guesswork .

SAE Standards We Work With

Standard	Application	Components Covered
SAE J516	Hydraulic hose fittings	37° flared, O-ring boss, split flange, O-ring face seal
SAE J517	Hydraulic hose	100R-series hose specifications
SAE J518	4-bolt split flanges	Code 61 and Code 62 flange connections
SAE J744	Hydraulic pump/motor mounting	2-bolt and 4-bolt flanges, shafts
SAE J1926	Straight thread O-ring ports	Inch series port dimensions
SAE J1453	O-ring face seal connectors	ORFS fittings for leak-free connections
SAE J515	O-ring materials	Seal compounds and hardness
SAE AS1896	Aerospace hydraulic couplings	Self-sealing couplings

SAE Hydraulic Components We Manufacture

SAE Flanged Pumps and Motors

We supply and integrate SAE-standard hydraulic pumps and motors for mobile and industrial applications .

Specification	Typical Range
SAE flange sizes	SAE A, B, C, D (2-bolt and 4-bolt configurations)
Displacement	10 – 250 cc/rev
Continuous pressure	Up to 400 bar
Peak pressure	Up to 450 bar
Maximum speed	2,300 – 8,000 rpm depending on model
Mounting	SAE J744 2-bolt and 4-bolt flanges
Shaft options	Keyed, splined (SAE involute splines)

 

Applications:

Construction equipment: excavators, loaders, skid steers

Truck equipment: cranes, hook lifts, stabilization cylinders

Agricultural machinery: tractors, harvesters

Forestry equipment: mulchers, harvester heads

Municipal vehicles: snow blowers, spreaders, sweepers

Mining and defense applications

 

SAE Hydraulic Valves

We manufacture and integrate a wide range of SAE-port hydraulic valves:

Valve Type	SAE Interfaces	Typical Applications
Directional control valves	SAE straight thread O-ring ports	Mobile equipment, industrial machinery
Flow control valves	SAE threaded ports, in-line SAE connections	Speed control for cylinders and motors
Pressure control valves	SAE cartridge cavities, SAE ports	Relief, reducing, sequence functions
Check valves	SAE cartridge, SAE inline	Load holding, pilot control
Proportional valves	SAE ports with electronic connectors	Precision motion control

 

STU-SAE flow control valve example :

SAE threaded ports for easy in-line installation

Maximum pressure: 400 bar

Maximum flow: 300 L/min

Integrated hydraulic compensator for pressure-compensated flow control

One-way adjustable flow, free reverse flow

Steel body with galvanized corrosion protection

Hardened and ground internal components

 

SAE Hydraulic Fittings and Connectors

We manufacture a complete range of SAE-standard fittings for leak-free connections .

Fitting Type	SAE Standard	Features
37° Flared (JIC)	SAE J516	Male and female configurations; sizes 4-32
O-ring Boss (ORB)	SAE J1926, SAE J516	Straight thread with O-ring seal; adjustable
4-Bolt Split Flange	SAE J518, SAE J516	Code 61 (3,000-5,000 psi); Code 62 (6,000 psi)
O-ring Face Seal (ORFS)	SAE J1453, SAE J516	Flat face with captured O-ring; zero leak potential
Pipe Thread (NPT/NPTF)	SAE J516	Tapered thread for lower-pressure applications
Flareless	SAE J516	Bite-type ferrule for high-pressure tubing

O-ring materials per SAE J515 for all sealing applications .

 

SAE Cartridge Valves

We integrate SAE-standard cartridge valves into custom manifolds:

Valve Function	SAE Cavity	Typical Application
Solenoid directional valves	SAE style cavity	Outrigger controls, scissor lifts, aerial platforms
Shuttle valves	SAE cavity	Logic circuits, pilot signals
Check valves	SAE cavity	Load holding, free flow control
Pressure relief	SAE cavity	System pressure limiting
Flow control	SAE cavity	Metering, speed control

Sun Hydraulics example: SAE-style cavity cartridge valves are compliant with industry standards, enabling drop-in replacement and design flexibility .

 

Custom SAE Manifolds

We design and machine custom hydraulic manifolds with SAE-standard ports and cavities:

Materials: 6061-T6 aluminum, 1045/4140 steel, 316 stainless steel

Port types: SAE O-ring boss, SAE split flange, SAE straight thread

Cartridge cavities: SAE standard cavities for screw-in cartridge valves

Complex circuits: Cross-drilled passages, integrated valving, sensor ports

Pressure rating: Verified to 420 bar with hydrostatic testing

SAE Mounting and Interface Dimensions

SAE Flange Mounting (J744)

SAE Size	Bolt Pattern	Pilot Diameter	Typical Displacement
SAE A	2-bolt or 4-bolt	82.55 mm (3.250″)	Up to 30 cc/rev
SAE B	2-bolt or 4-bolt	101.60 mm (4.000″)	12-63 cc/rev
SAE C	2-bolt or 4-bolt	127.00 mm (5.000″)	50-150 cc/rev
SAE D	4-bolt	152.40 mm (6.000″)	100-250 cc/rev

 

SAE Straight Thread O-Ring Ports (J1926)

Dash Size	Thread	O-ring	Tube OD
-4	7/16-20	-904	1/4″
-6	9/16-18	-906	3/8″
-8	3/4-16	-908	1/2″
-10	7/8-14	-910	5/8″
-12	1-1/16-12	-912	3/4″
-16	1-5/16-12	-916	1″
-20	1-5/8-12	-920	1-1/4″
-24	1-7/8-12	-924	1-1/2″

 

SAE Split Flange (J518)

Code	Pressure Rating	Dash Sizes	Typical Use
Code 61	3,000 – 5,000 psi	-8 to -32	General industrial, mobile
Code 62	6,000 psi	-8 to -32	High-pressure applications

Our Manufacturing Capabilities for SAE Components

Precision Machining

Equipment	Capability
CNC turning centers	Up to 480 mm diameter; live tooling for milling/drilling
CNC milling centers	3/4/5-axis; up to 2000 mm × 1000 mm envelope
Multi-axis turning	Complex port configurations in single setups
Deep hole drilling	Depth-to-diameter up to 40:1 for manifold passages
Thread grinding	Precision SAE threads for high-cycle applications

 

Tolerances and Quality

Feature	Standard	Precision
Port location	±0.05 mm	±0.02 mm
Thread class	2A/2B	3A/3B available
Surface finish (sealing)	Ra 0.8 μm	Ra 0.4 μm
Cartridge cavity form	±0.025 mm	±0.013 mm
Concentricity	0.05 mm TIR	0.02 mm TIR

 

Material Options

Material	SAE Component Applications
6061-T6 aluminum	Manifolds, valve bodies, light-duty components
1045 / 4140 steel	High-pressure manifolds, fittings, flanges
316 stainless steel	Corrosion-resistant fittings, marine components
Ductile iron	Pump housings, valve bodies
Brass	Low-pressure fittings, instrumentation

 

Surface Finishing

Zinc plating: Clear or yellow chromate for corrosion resistance

Nickel plating: Electroless nickel for uniform coverage

Anodizing: Hardcoat or decorative for aluminum components

Passivation: For stainless steel components

Phosphate coating: For steel components prior to painting

Quality Assurance and Testing

Inspection Equipment

CMM with scanning capability for complex port locations

Optical comparators for thread forms

Surface roughness testers for sealing surfaces

Hardness testers (Rockwell, Brinell)

Spectrometer for material verification

 

Testing Capabilities

Test	Purpose	Standard
Hydrostatic pressure	Verify integrity at 1.5× rated pressure	SAE J516
Leak testing	Detect microscopic leaks	Air under water or pressure decay
Functional testing	Verify valve operation	Per customer specifications
Flow testing	Pressure drop vs. flow curves	SAE J516
Cycle testing	Endurance verification	SAE ARP603

Customer Examples

SAE B-Flange Pump for Truck Crane

Customer: European truck equipment manufacturer

Challenge: Compact hydraulic pump for engine PTO mounting with SAE B flange, 380 bar continuous pressure

Our solution:

SAE B 2-bolt flange pump

12-63 cc/rev displacement range

420 bar peak capability

Bi-rotational design for simplified installation

Result: Reliable crane operation in demanding duty cycles; simplified inventory with single pump covering multiple models.

 

Custom SAE Manifold with Cartridge Valves

Customer: Mobile equipment manufacturer needing integrated control for 8 hydraulic functions

Challenge: Complex circuit with multiple SAE cartridge valves in compact envelope

Our solution:

4140 steel manifold block

SAE O-ring boss ports for all connections

SAE standard cartridge cavities for Sun Hydraulics valves

Cross-drilled passages with deburred intersections

100% pressure tested at 400 bar

Result: Simplified installation, reduced leak points, improved machine reliability.