Steel Hollow Ball

HRGQ has been providing hollow balls for variety of industries for over 15 years.

Click here to learn more about Hollow Ball manufacturing process. 


Advanced Welding Technology

Patented welding technology guarantee 100% penetration as much as 6mm thickness steel.

Welding is automated. Output rate up to 10,000 pcs per day.


Quality Control
       100% in-process inspection for welding quality. X-Ray test available upon customer requirement.
(X-Ray test for welding quality)

Load test/Impact test after heat treating

(Load test equipment and report)
Size and Grade

        HRGQ currently manufactures hollow stainless balls from size 4mm to 150mm.

(smallest HOLLOW ball : 4mm)

Common grade from G100-G1000.


New Released

We have newly released Grade 10 high precision hollow ball for ball bearings application. More than 60% save in weight while maintain same mechanical properties. 


  • Material: 52100 bearing steel
  • Hardness: HRC61-67
  • Roundness: 0.25um
  • Surface Roughness:0.02um 

Heat treatment is conducted per AMS2759/2. Deep-freeze(-80℃) is processed.

(Hollow ball applied in ball bearings)
Material available for hollow ball
  • Austenitic Steel     302, 304/304L, 316/316L
    Most common hollow ball material. Good for valve and float ball.
  • Martensite Steel   420/420C
    HRC 55 and above. For applications that need hardened material. 
  • Duplex Steel  2205/2507
    Featured with improved strength over austenitic stainless steel and also improved localized corrosion resistance, particularly pitting, crevice corrosion and stress corrosion cracking. Comparing with austenitic stainless steel, they also with lower thermal expansively and higher heat transfer rate. The 2507 is also called “SuperDuplex” due to its higher corrosion resistance.
  • Carbon Steel   C1020
    To be used as cores for coating processes. Common coating material including rubber, plastic, etc... 
  • (New released) Bearing Steel  52100/100Cr6
    High precision finish, G10 and above. Substitute solid balls in ball bearing applications. 60% weight advantage compare to conventional solid balls.



Our engineering team are always ready to develop new product for your needs of hollow balls in any material and any specification.


Some developed features:
  • Light weight  (0.1gram)
  • Thin wall thickness  (0.2mm)
  • Small diameter (4mm)
  • Float in water
  • Tight weight tolerance (+/- 0.1gram)