Requesting a quotation for a hydraulic hose assembly may appear straightforward. However, descriptions such as “one high-pressure hose,” “same as the sample,” or “a 1/2-inch hose with two fittings” are usually not enough to prepare an accurate offer.

A complete hose assembly includes:

• The hydraulic hose
• Two hose fittings
• Ferrules or sockets
• Sealing components
• Fitting orientation
• Protective accessories
• Cleaning and testing requirements
• Identification and packaging requirements

A missing detail can change the hose model, fitting type, assembly length, pressure rating, manufacturing method, and final price.

For procurement personnel, providing a structured request for quotation helps reduce technical questions, avoid incorrect assemblies, and shorten the approval process.

The following information should be included in a hydraulic hose assembly RFQ.

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1. Application and Equipment Type

Start by explaining where the hose will be installed.

Examples include:

• Excavator
• Tractor
• Agricultural implement
• Dump trailer
• Garbage truck
• Forklift
• Hydraulic press
• Injection molding machine
• Dock leveler
• Hydraulic power unit
• Marine equipment
• Industrial production line

Also explain the function of the hose:

• Cylinder pressure line
• Cylinder return line
• Pump outlet
• Pump suction
• Motor line
• Case drain
• Pilot line
• Accumulator line
• Lubrication line

This information helps the supplier understand whether the assembly will be exposed to high pressure, pressure impulses, vacuum, repeated movement, vibration, abrasion, or a demanding external environment.

SAE J1273 treats hose selection, routing, fabrication, installation, replacement, maintenance, and storage as connected parts of hose-assembly safety and performance. Application information is therefore essential, even when the basic dimensions are already known.

2. Hose Inside Diameter or Dash Size

Specify the required hose inside diameter.

It may be given in:

• Millimeters
• Inches
• Dash size
• Existing hose part number

Common examples include:

• 6.3 mm or 1/4 inch
• 10 mm or 3/8 inch
• 12.5 mm or 1/2 inch
• 19 mm or 3/4 inch
• 25 mm or 1 inch

In many hydraulic hose systems, dash size represents the nominal hose ID in sixteenths of an inch. For example, a -8 hose is generally associated with a nominal 1/2-inch ID, although buyers should confirm the manufacturer’s specific product data.

Do not identify the hose only by its outside diameter. Hoses with different reinforcement structures can have similar outside diameters but different inside diameters and pressure capabilities.

When the required size is unknown, provide:

• Required flow rate
• Existing hose layline
• Cut-section measurement
• Original machine part number
• Hydraulic schematic
• Clear photographs with dimensions

3. Maximum Working Pressure

Provide the normal working pressure and the maximum possible system pressure.

For example:

• Normal working pressure: 160 bar
• Maximum pressure: 210 bar
• Possible transient pressure: 250 bar

The supplier should not select the hose based only on the normal operating value if the circuit is exposed to higher relief-valve settings or pressure spikes.

The rated working pressure of the complete assembly must be equal to or greater than the maximum system pressure. The final assembly rating is controlled by its lowest-rated hose, fitting, adapter, or connection.

Do not request a hose using only the desired burst pressure. Burst pressure is not the allowable continuous operating pressure.

4. Hydraulic Fluid or Other Medium

Identify the exact fluid that will pass through the hose.

Possible media include:

• Mineral hydraulic oil
• Synthetic hydraulic fluid
• Biodegradable oil
• Water-glycol fluid
• Water-oil emulsion
• Lubrication oil
• Diesel fuel
• Coolant
• Compressed air
• Chemical solution

When possible, provide the fluid brand and model.

The hose inner tube, fittings, O-rings, and seals must all be compatible with the medium. A hose suitable for standard mineral hydraulic oil may not be suitable for phosphate ester, water-glycol, high-water-content fluid, chemicals, or hot compressed air.

Chemical compatibility should cover both the fluid inside the assembly and substances that may contact the exterior hose cover.

5. Fluid and Ambient Temperature

Provide the normal and maximum temperature of the fluid.

Also state the ambient temperature around the hose.

Example:

• Fluid temperature: normally 40–70°C
• Maximum fluid temperature: 90°C
• Ambient temperature: -20 to 45°C
• Installed near engine exhaust: yes

Fluid temperature and ambient temperature affect different parts of the hose. The internal fluid primarily affects the inner tube, while environmental heat can damage the cover and reinforcement.

Temperature ratings may vary according to the conveyed medium. A hose may be approved for a particular maximum temperature with petroleum oil but require a lower limit when used with water-based fluid or air.

For high-temperature applications, describe whether the exposure is:

• Continuous
• Intermittent
• Radiant
• Direct contact
• Caused by internal fluid
• Caused by nearby equipment

6. Hose Type or Required Standard

Provide the hose specification when it has already been determined.

Examples may include:

• SAE 100R1
• SAE 100R2
• SAE 100R12
• SAE 100R13
• SAE 100R15
• SAE 100R17
• EN 853
• EN 856
• ISO 18752
• Manufacturer-specific hose series
• OEM equipment part number

Different hose constructions offer different pressure capabilities, flexibility, bend radii, impulse resistance, abrasion resistance, and temperature ranges.

SAE J517 defines requirements for multiple hydraulic hose types, including their dimensions and performance characteristics. Buyers should identify the required standard and revision when contract compliance is important.

When the hose type is unknown, provide the operating conditions and allow the supplier to recommend a suitable construction.

7. Fitting Type at End A

Clearly identify the first hose fitting.

The RFQ should include:

• Fitting family
• Male or female
• Straight, 45-degree, or 90-degree
• Thread size
• Thread pitch
• Sealing method
• Tube or port size
• Swivel or fixed
• Material and surface treatment

Example:

End A: JIC 37-degree female swivel, 3/4-16 UNF, straight

Other common types include:

• BSPP female swivel
• BSPT male
• NPT male
• ORFS female swivel
• Metric DIN 24-degree cone
• SAE O-ring boss
• SAE flange
• Banjo
• Standpipe
• Custom block or manifold connection

A photograph of the fitting is helpful, but it should be accompanied by measurements. Several thread systems can look similar in a photograph.

8. Fitting Type at End B

Provide the same information for the second end.

Example:

End B: Metric 24-degree female swivel, M18 × 1.5, 90-degree elbow

Do not assume that both ends are identical.

A hose assembly may include:

• Two different thread standards
• One straight and one elbow fitting
• One swivel and one fixed fitting
• One hose fitting and one flange
• One standard fitting and one custom adapter

Where adapters are required, specify whether they should be included in the quotation or supplied separately by the customer.

9. Overall Assembly Length

Specify the finished overall length and the measuring reference points.

For example:

• 1,200 mm overall length
• Measured sealing face to sealing face
• Length tolerance: ±10 mm

The measurement method can change depending on whether the assembly uses straight fittings, elbow fittings, flanges, banjos, or standpipes.

A drawing should clearly show the points between which the length is measured.

Do not provide only the exposed rubber-hose length unless that is the supplier’s agreed manufacturing method. The finished assembly length usually includes fitting-related dimensions.

The selected length must also account for machine movement, installation tolerances, bending, and possible hose-length changes under pressure. Parker’s technical guidance recommends considering machine movement, pressure-related hose-length changes, and dimensional tolerances when determining the assembly length.

10. Fitting Orientation

Fitting orientation is required when both ends use angled fittings.

Imagine looking along the length of the assembly from one end. The angular relationship between the two elbow fittings must be defined, such as:

• 0 degrees
• 45 degrees
• 90 degrees
• 180 degrees
• 270 degrees

The drawing must also specify:

• Which end is used as the reference
• The viewing direction
• Clockwise or counterclockwise rotation
• Acceptable angular tolerance

Incorrect orientation may make an otherwise correct assembly impossible to install.

According to Parker’s explanation of SAE-based orientation practices, angular tolerances may vary with assembly length, making clear orientation specifications especially important for longer assemblies.

11. Dynamic Movement and Bend Radius

State whether the hose remains stationary or moves during machine operation.

For dynamic assemblies, provide:

• Minimum and maximum mounting distance
• Direction of movement
• Movement frequency
• Maximum articulation angle
• Available routing space
• Minimum installation bend radius
• Whether the hose bends in one plane
• Whether twisting may occur

A hose installed below its minimum bend radius may suffer reinforcement damage and reduced service life. Sharp bending near the fitting is especially harmful.

A drawing showing the equipment in both minimum and maximum positions is highly useful for moving applications.

12. External Operating Environment

Describe the surrounding conditions.

Important factors include:

• Abrasion
• Outdoor UV exposure
• Saltwater
• Fertilizer
• Welding sparks
• Hot metal
• Engine heat
• Chemicals
• Mud
• Ice
• Concrete
• Underground installation
• Offshore or marine conditions

The environment may affect the selection of the hose cover and additional protection.

Possible options include:

• Abrasion-resistant cover
• Textile sleeve
• Spiral guard
• Fire sleeve
• Spring guard
• Heat shield
• Anti-static hose
• Flame-resistant hose
• Hose-restraint device

Specify the required protective accessories separately so that they are included in the quotation.

13. Cleanliness Requirements

Newly manufactured hose assemblies can contain particles from cutting, skiving, crimping, and handling.

For sensitive systems, state the required cleanliness level or cleaning method.

Possible requirements include:

• Air cleaning
• Foam-projectile cleaning
• Flushing
• Capped ends
• Sealed packaging
• Customer-specified cleanliness code
• Cleanroom assembly

Cleanliness is particularly important for:

• Servo hydraulic systems
• Proportional valves
• Precision test benches
• High-pressure common-rail equipment
• Hydraulic systems with small valve clearances

SAE-related hose guidance also identifies hose cleanliness as an application consideration rather than merely a packaging preference.

14. Pressure Testing and Inspection

State whether the assemblies require individual pressure testing.

Possible requirements include:

• Visual inspection only
• Crimp-diameter inspection
• Proof-pressure test
• Leakage test
• Burst test on sample assemblies
• Impulse testing
• Dimensional inspection
• Cleanliness inspection

Also specify:

• Test pressure
• Holding time
• Test medium
• Applicable standard
• Sampling rate
• Certificate format
• Third-party inspection requirement

Proof testing every production assembly and burst testing a qualification sample are different requirements. The RFQ should clearly distinguish them.

15. Identification and Traceability

Buyers may require each assembly to carry:

• Customer part number
• Supplier part number
• Hose model
• Manufacturing date
• Batch number
• Maximum working pressure
• Barcode
• QR code
• Equipment position
• End A and End B identification

Identification may be applied through:

• Printed layline
• Metal tag
• Heat-shrink label
• Plastic tag
• Laser marking
• Packaging label

Clear traceability simplifies installation, inventory control, replacement ordering, and quality investigation.

16. Quantity and Annual Demand

Provide both the initial order quantity and expected annual demand.

For example:

• Prototype quantity: 5 assemblies
• First production order: 100 assemblies
• Estimated annual demand: 1,000 assemblies

Quantity influences:

• Material purchasing
• Manufacturing setup
• Testing method
• Packaging
• Unit price
• Delivery schedule
• Tooling decisions
• Stocking arrangements

Buyers should also state whether the quotation is for:

• Prototype development
• Replacement parts
• Small-batch production
• Long-term OEM supply
• Distributor inventory
• Emergency maintenance

17. Packaging Requirements

Specify how the assemblies should be packed.

Possible requirements include:

• Individual plastic bags
• End caps or plugs
• Coiled assemblies
• Minimum coil diameter
• Part-number labels
• Export cartons
• Wooden cases
• Palletized packaging
• Moisture protection
• Seaworthy packaging

Long assemblies and hoses with large fittings may need special packaging to prevent kinking, contamination, or fitting damage during transportation.

18. Delivery Terms and Destination

To receive an accurate commercial quotation, provide:

• Delivery destination
• Required delivery date
• Preferred Incoterm
• Air or sea shipment preference
• Whether freight should be included
• Whether customs clearance is required

Common quotation terms include:

• EXW
• FOB
• CIF
• DAP
• DDP

The delivery location and order urgency can significantly affect total landed cost, especially for small quantities or long hose assemblies.

What to Send When the Existing Hose Cannot Be Identified

When replacing an existing assembly, send as many of the following as possible:

• Original hose assembly
• Clear overall photograph
• Close-up photograph of End A
• Close-up photograph of End B
• Photograph of the hose layline
• Overall length
• Hose ID
• Thread outside diameter
• Thread pitch
• Fitting seat photograph
• Elbow orientation
• Equipment brand and model
• OEM part number
• Operating pressure
• Hydraulic fluid
• Quantity

Do not discard the original assembly until the replacement dimensions and orientation have been confirmed.

Hydraulic Hose Assembly RFQ Template

Use the following format when requesting a quotation:

Equipment/Application:
[Equipment type and hose function]

Hose ID or Dash Size:
[For example, 12.5 mm / 1/2 inch / -8]

Hose Standard or Model:
[For example, SAE 100R2AT]

Normal Working Pressure:
[bar or MPa]

Maximum System Pressure:
[bar or MPa]

Fluid:
[Fluid brand and type]

Fluid Temperature:
[Minimum, normal, and maximum]

Ambient Temperature:
[Minimum and maximum]

End A:
[Thread, gender, sealing type, angle]

End B:
[Thread, gender, sealing type, angle]

Overall Length:
[Length and measurement reference]

Fitting Orientation:
[Angle and viewing direction]

Application Movement:
[Stationary or dynamic]

External Environment:
[Abrasion, heat, chemicals, outdoor exposure, etc.]

Protective Accessories:
[Sleeve, spiral guard, fire sleeve, etc.]

Testing Requirements:
[Test pressure, holding time, standard, certificate]

Identification Requirements:
[Label, part number, batch number, barcode]

Order Quantity:
[Prototype and production quantities]

Annual Demand:
[Estimated quantity]

Packaging:
[Individual bags, cartons, pallets, etc.]

Delivery Destination and Incoterm:
[City, country, and required term]

Required Delivery Date:
[Date]

Conclusion

An accurate hydraulic hose assembly quotation depends on more than hose diameter and length.

The supplier needs to understand the hose size, working pressure, fluid, temperature, application, fitting types, fitting orientation, operating movement, environmental exposure, testing requirements, quantity, and delivery terms.

Providing this information at the beginning of the project helps procurement teams:

• Receive a more accurate price
• Compare suppliers on the same technical basis
• Reduce repeated technical questions
• Avoid incorrect samples
• Shorten drawing approval
• Prevent installation problems
• Improve hose reliability
• Reduce total replacement cost

To request a custom hydraulic hose assembly quotation from AiSoar Hydraulics, send the completed RFQ information together with available drawings, photographs, part numbers, or physical samples