Was ist SAE J20?

SAE J20 2022

Issued 1944-01

Reaffirmed 2015-03

Revised 2022-02

Superseding J20 MAR2015

SURFACE VEHICLE STANDARD

Coolant System Hoses

This SAE Standard covers reinforced, and flexible hoses intended for use in water and ethylene glycol-based engine-coolant system applications.

1， Added 3.6.4. Added Section 14 for fatigue-resistant designator, which defines the pressure cycle requirements and waveform.

14. FATIGUE RESISTANT SERVICE HOSE FR

14.1 Scope

Any pre-shaped hose type SAE 20R1, 20R3, or SAE 20R4 which may be operated in a high-fatigue pressure cycling

environment. The letters FR will be used to designate this requirement, for example, SAE 20R3 FR Class D-3.

Main Contents of this profile

3， definitions of hose types

3.1 SAE 20R1 Heavy-duty type for service

in the heavy-duty application. This type is available in two wall thicknesses, as indicated in 6.3.

3.2 SAE 20R2 Flexible heavy-duty wire embedded type for the same service as SAE 20R1.

3.3 SAE 20R3 Heater hose for normal service.

3.4 SAE 20R4 Radiator hose for normal service.

3.5 SAE 20R5 Convoluted wire supported type for normal service.

3.6 HOSE SPECIAL DESIGNATORS FOR SAE 20RXY

X refers to the hose type. Y designators may be used for hoses with special features. Multiple Y designators may be used if needed.

3.6.1 HT

This high-temperature designation is for any hose type, SAE 20R1 to SAE 20R5, which is required to operate in an environment above 125 °C.

3.6.2 EC

This electrochemical designation is for any hose type, SAE 20R1 to SAE 20R5, which is required to have electrochemical resistance as defined by SAE J1684.

3.6.3 LT

This low-temperature designation is for any hose type, SAE 20R1 to SAE 20R5, which is required to operate in an environment down to -55 °C.

3.6.4 FR

This fatigue-resistant designation is for any pre-shaped hose type SAE 20R1, 20R3, or 20R4 which is required to operate in a high-fatigue pressure cycling environment.

3.7 HOSE CLASSES

Compounds based on different synthetic rubber grades are specified and designated (see 5.2 for test methods):

Class A—High-temperature resistant

Class B—High oil resistant

Class C—Medium oil resistant

Class D-1—Low oil resistant, improved service

Class D-2—Low oil resistant, standard service

Class D-3—Low oil resistant, high-temperature resistant, premium service

Class E—Low oil resistant, fiber elastomer composite.

4， Dimensional requirements

1， Tube and Cover Thickness

2， Length Tolerance

3， General Layout Tolerances, Curved Hose

4， Enlarged Ends

5， Ends Squareness

6， Finish and Roundness on Connections

7， Clamps

8， Physical test requirements and procedures

5.1， finished products

1) adhesion

2）cold flexibility

3）Ozone Test and Requirements

4）Kink Test

5）Vacuum collapse test

6）Burst

7）Pressure vibration and temperature or pressure and temperature test

5.2， Physical Properties are to be obtained from Specimens Removed from Hose

1）Durometer Hardness

2）Tensile Strength and Elongation

3）Oven Aging

4）Coolant immersion

5）Oil Immersion

6）Compression set

6 SAE J20 HEAVY-DUTY TYPE

7 SAE J20 HEAVY-DUTY WIRE EMBEDDED TYPE

8 SAE J20 HEATER HOSE

9 SAE J20 RADIATOR HOSE NORMAL SERVICE TYPE

10 SAE J20 NORMAL SERVICE TYPE CONVOLUTED,WIRE SUPPORTED HOSE

11 HIGH-TEMPERATURE SERVICE HOSE HT

12 ELECTROCHEMICAL RESISTANT HOSE EC

13 LOW-TEMPERATURE SERVICE HOSE LT

14 FATIGUE-RESISTANT SERVICE HOSE FR

15. SHELF LIFE

Refer to military specification MIL-HDBK-695 for SAE J20 hose shelf life, and ARPM Handbook IP-2 for hose storage conditions.

16. NOTES

16.1 Revision Indicator

A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.

For more information on this standard, visit

https://www.sae.org/standards/content/J20_202202/

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SAE J20 sind Kühlmittelschläuche. Die SAE-Norm gilt für verstärkte und flexible Schläuche, die für den Einsatz im Motorkühlsystem auf Wasserbasis und Ethylenglykol Basis angepasst sind.