PRODUCTS
Metallic Gasket
Metal Hollow O-Ring
Hollow metal O-ring is made by heat resistant and noncorrosive stainless steel pipe. It is available to have small holes in the inner diameter or outer diameter, when the pressure increasing, the self-sealing function will be work. The hollow O-ring with small holes is specially applied when the pressure over than 70kgf/cm2, the pressure resistant will better than no holes O-ring. Upon customer’s requirement, we also offer O-ring surface coating PTFE or silver.
●Style

Style & Profile Style No.
Hollow ZW#5500-HL
Hollow (with Inner Holes) ZW#5500-HLI
Hollow (with Outer Holes) ZW#5500-HLX

●Order Code

ZW#5500-OV-E means Oval Style 304SS metal ring joint gasket

Style
HL Hollow
HLI Hollow (with inner Holes)
HLO Hollow (with outer Holes)

Materials
D Soft Iron M Monel 400
S Low Carbon Steel F 5Cr-0.5Mo
E 304SS N Nickel 200
L 304LSS Y Inconel 600/625
G 316SS Y1 Inconel X750
H 316LSS W Incoloy 800(H)/825
O 310SS T Titanium
P 316Ti SS X1 Hastelloy B2/B3
J 321SS X2 Hastelloy C276
K 347SS X3 Hastelloy C22
R 410SS A Aluminum
U 430SS C Copper
V 904L F11 1.25Cr-0.5Mo

● Material Properties
Material Code Max. Hardness Working Temperature(°C)
Category Description Brinell
BHN/HB		 Rockwell B
HRB		 Min. Max.
General Grade Carbon steel Low Carbon Steel S 120 68 -40 540
Soft Iron D 90 56 -40 500
5Cr-0.5Mo F 130 72 -29 650

Stainless steel		 304SS E 160 83 -250 540
304LSS L 160 83 -250 540
316SS G 160 83 -200 815
316LSS H 160 83 -200 815
410SS R 170 86 -40 850
Non-ferrous metal Copper C 81 41 -100 315
Aluminum A 35 - -200 425
Special
Grade		 Stainless steel 321SS J 160 83 -200 870
347SS K 160 83 -200 870
Inconel 600/625 Y 150 78 -100 1095
Incoloy 800(H)/825 W 150 78 -100 1095
Non-ferrous metal Monel 400 M 160 83 -100 760
Titanium T 160 83 -200 540
Nickel 200 N 120 68 -200 760
Hastelloy B2/B3 X1 230 98 -100 1095
Hastelloy C276/C22 X2/X3 210 96 -100 1095
※It is recommended that the Ring Joint Gaskets to be of a lesser hardness than that of the mating flanges.
※Ring joint gaskets of materials listed shall have a hardness equal to or less than that shown as above.

  Tolerance mm inch
  A , C (Width)  ± 0.20  ± 0.008
 B , H (Height)  +1.3 / -0.5  +0.05/-0.020
    P (Average pitch diameter of ring)  ± 0.18  ± 0.007
   23 deg (Angle)  ± 0 deg 30 min.
R1 (Radius in ring)  ± 0.5  ± 0.02
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