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Maryland Metrics: Technical Data Chart
   
JIS GS standard o-ring size listing
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GS standard Cord diameter Inner diameter Outer diameter
number (thickness) ID OD
  W    
GS-150 3.1±0.10 149.3±1.19 155.5
GS-155 3.1±0.1 0 154.3±1.23 160.5
GS-160 3.1±0.1 0 159.3±1.26 165.5
GS-165 3.1±0.1 0 164.3±1.30 170.5
GS-170 3.1±0.1 0 169.3±1.33 175.5
GS-175 3.1±0.1 0 174.3±1.37 180.5
GS-180 3.1±0.1 0 179.3±1.40 185.5
GS-185 3.1±0.1 0 184.3±1.44 190.5
GS-190 3.1±0.1 0 189.3±1.47 195.5
GS-195 3.1±0.1 0 194.3±1.51 200.5
GS-200 3.1±0.1 0 199.3±1.55 205.5
GS-205 3.1±0.1 0 204.3±1.58 210.5
GS-210 3.1±0.1 0 209.3±1.61 215.5
GS-215 3.1±0.1 0 214.3±1.65 220.5
GS-220 3.1±0.1 0 219.3±1.68 225.5
GS-225 3.1±0.1 0 224.3±1.71 230.5
GS-230 3.1±0.1 0 229.3±1.75 235.5
GS-235 3.1±0.1 0 234.3±1.78 240.5
GS-240 3.1±0.1 0 239.3±1.81 245.5
GS-245 3.1±0.1 0 244.3±1.85 250.5
GS-250 3.1±0.1 0 249.3±1.88 255.5
GS-255 3.1±0.1 0 254.3±1.91 260.5 
GS-260 3.1±0.1 0 259.3±1.94 265.5 
GS-265 3.1±0.1 0 264.3±1.98 270.5 
GS-270 3.1±0.1 0 269.3±2.01 275.5
GS-275 3.1±0.1 0 274.3±2.04 280.5
GS-280 3.1±0.1 0 279.3±2.07 285.5
GS-285 3.1±0.1 0 284.3±2.11 290.5
GS-290 3.1±0.1 0 289.3±2.14 295.5
GS-295 3.1±0.1 0 294.3±2.17 300.5
GS-300 3.1±0.1 0 299.3±2.20 305.5
GS-305 3.1±0.10 304.3±2.24 310.5
GS-310 3.1±0.10 309.3±2.27 315.5
GS-315 3.1±0.10 314.3±2.30 320.5
GS-320 3.1±0.10 319.3±2.33 325.5
GS-325 3.1±0.10 324.3±2.36 330.5
GS-330 3.1±0.10 329.3±2.39 335.5
GS-335 3.1±0.10 334.3±2.42 340.5
GS-340 3.1±0.10 339.3±2.45 345.5
GS-345 3.1±0.10 344.3±2.48 350.5
GS-350 3.1±0.10 349.3±2.51 355.5
GS-355 3.1±0.10 354.3±2.54 360.5
GS-360 3.1±0.10 359.3±2.57 365.5
GS-365 3.1±0.10 364.3±2.60 370.5
GS-370 3.1±0.10 369.3±2.63 375.5
GS-375 3.1±0.10 374.3±2.67 380.5
GS-380 3.1±0.10 379.3±2.70 385.5
GS-385 3.1±0.10 384.3±2.73 390.5
GS-390 3.1±0.10 389.3±2.77 395.5
GS-395 3.1±0.10 394.3±2.79 400.5
GS-400 3.1±0.10 399.3±2.82 405.5
GS-405 3.1±0.10 404.3±3.00 410.5
GS-410 3.1±0.10 409.3±3.00 415.5
GS-415 3.1±0.10 414.3±3.00 420.5
GS-420 3.1±0.10 419.3±3.00 425.5
GS-425 3.1±0.10 424.3±3.00 430.5
GS-430 3.1±0.10 429.3±3.00 435.5
GS-435 3.1±0.10 434.3±3.00 440.5
GS-440 3.1±0.10 439.3±3.00 445.5
GS-445 3.1±0.10 444.3±3.00 450.5
GS-450 3.1±0.10 449.3±3.00 455.5
GS-455 3.1±0.10 454.3±3.30 460.5
GS-460 3.1±0.10 459.3±3.30 465.5
GS-465 3.1±0.10 464.3±3.30 470.5
GS-470 3.1±0.10 469.3±3.30 475.5
GS-475 3.1±0.10 474.3±3.30 480.5
GS-480 3.1±0.10 479.3±3.30 485.5
GS-485 3.1±0.10 484.3±3.30 490.5
GS-490 3.1±0.10 489.3±3.30 495.5
GS-495 3.1±0.10 494.3±3.30 500.5
GS-500 3.1±0.10 499.3±3.30 505.5

(Unit: mm)

O ring GS standard (size table) GS standard (GS / GS series) It is size table of O ring. For inner diameter and outer diameter, basic tolerance. For GS standard of O-ring dimension standard, for each cord diameter (thickness of cross section of O ring) will be posted. The GS standard widely used as size series for O-rings for cylindrical surface fixing and flat fixing is derived from the G standard in the **Showa era and stipulated. The G standard O ring with an inner diameter of 150 mm or more has a cord diameter of 5.7 mm, but it is GS standard that it is 3.1 mm.
**The Showa period, potentially "period of enlightened peace/harmony" or "period of radiant Japan"), or Showa era refers to the period of Japanese history corresponding to the reign of the Showa Emperor, Hirohito, from December 25, 1926, through January 7, 1989.


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