Cords

Cord extrusion

O-RING CORD

The round profile ring is called “O-RING CORD”.  It is the most widely used and robust seal profile which stood the test of time. 

SQUARE CORD

The square profile rings are “SQUARE CORD”. Before the O-RING was invented a long rubber tube was cut into thin gaskets. Because the square rings are compression molded, the square rings should have better mechanical properties than square cuts.

X-RING CORD

For sizing comparison purpose X-RING dimensions match those of O-RING dimensions. The X profile costs more than the round profile. The X-RING has rounded corners and concave indents. 

Materials:

Buna 50, Buna 70, Viton (r) 75, Silicone 50, Silicone 70 durometers

Sizes:

Inches OD

  • .070
  • .093
  • .103
  • .125
  • .139
  • .188
  • .210
  • .250
  • .275
  • .312
  • .375
  • .437
  • .500
  • .562
  • .625
  • .750
  • 1.000

Millimeter OD

  • 1.5mm
  • 2.0mm
  • 2.5mm
  • 3.0mm
  • 3.5mm
  • 4.0mm
  • 4.5mm
  • 5.0mm
  • 5.5mm
  • 6.0mm
  • 6.5mm
  • 7.0mm
  • 7.5mm
  • 8.0mm
  • 8.5mm
  • 9.0mm
  • 9.5mm
  • 10mm
  • 11mm
  • 12mm
  • 13mm
  • 14mm
  • 15mm
  • 16mm
  • 17mm
  • 18mm
  • 19mm
  • 20mm
  • 21mm
  • 22mm
  • 23mm
  • 24mm
  • 25mm

Extruded Rubber Products (cords) Tolerances

E1 High Precision
E2 Precision
E3 Commercial

APRM Class High Precision Precision Commercial
Drawing Designation E1 E2 E3
Dimensions (millimeters)
Over Through      
0.0 1.5 ±0.15 ±0.25 ±0.40
1.5 2.5 0.20 0.35 0.50
2.5 4.0 0.25 0.40 0.70
4.0 6.3 0.35 0.50 0.80
6.3 10.0 0.40 0.70 1.00
10.0 16.0 0.50 0.80 1.30
16.0 25.0 0.70 1.00 1.60
25.0 40.0 0.80 1.30 2.00
40.0 63.0 1.00 1.60 2.50
63.0 100.0 1.30 2.00 3.20

APRM Class High Precision Precision Commercial
Drawing Designation E1 E2 E3
Dimensions (inches)
Over Through      
0.000 0.060 ±0.006 ±0.010 ±0.015
0.600 0.100 0.008 0.014 0.020
0.100 0.160 0.010 0.016 0.027
0.160 0.250 0.014 0.020 0.031
0.250 0.390 0.016 0.027 0.039
0.390 0.630 0.020 0.031 0.051
0.630 0.980 0.027 0.039 0.063
0.980 1.570 0.031 0.051 0.079
1.570 2.480 0.039 0.063 0.098
2.480 3.940 0.051 0.079 0.126