PRP AS568 O-Ring Size Reference Chart
SAE Aerospace Standard · 349 Standard Sizes + 20 Boss Sizes
−
100%
+
349 sizes
+ 20 boss
Dash Number
Closest I.D. (inches)
Cross Section
— All cross sections —
0.040" / 1.02 mm (1/32")
0.050" / 1.27 mm
0.060" / 1.52 mm
0.070" / 1.78 mm (1/16") · Series 001–050
0.103" / 2.62 mm (3/32") · Series 102–178
0.139" / 3.53 mm (1/8") · Series 201–284
0.210" / 5.33 mm (3/16") · Series 309–395
0.275" / 6.99 mm (1/4") · Series 425–475
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349
standard sizes
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▶ Boss Sizes (901–932)
Straight thread tube fitting O-rings · 20 sizes
Dash #
Tube O.D.
(ref)
Actual Dimensions — Inches
Actual Dimensions — Millimeters
I.D.
I.D. Tol. ±
C.S.
CS Tol. ±
I.D.
I.D. Tol. ±
C.S.
CS Tol. ±