ResourcesDWG symbol librariesO-rings, ISO 3601
Cross-section 1.78 mm
O-rings, ISO 3601: Cross-section 1.78 mm: 47 ready-made AutoCAD blocks (DWG), free to download and use in your own projects, as a ZIP or one symbol at a time.
47 O-rings of 1.78 mm cross-section, size codes 004 to 050: the smallest rings, for small valves, fittings and instruments.
Version 1.0 · updated October 17, 2026
Using AutoCAD 2017 or an earlier version? Download the 2010 format
Free to use and modify in your own projects, including commercial ones. The ZIP holds one plain DWG file in AutoCAD 2018 format and a README; no add-in needed. Provided as is, without warranty.
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All 47 symbols
47 of 47 symbols
O-ring 1.78 x 1.78
ORG_004Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 2.57 x 1.78
ORG_005Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 2.90 x 1.78
ORG_006Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 3.68 x 1.78
ORG_007Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 4.47 x 1.78
ORG_008Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 5.28 x 1.78
ORG_009Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 6.07 x 1.78
ORG_010Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 7.65 x 1.78
ORG_011Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 9.25 x 1.78
ORG_012Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 10.82 x 1.78
ORG_013Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 12.42 x 1.78
ORG_014Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 14.00 x 1.78
ORG_015Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 15.60 x 1.78
ORG_016Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 17.17 x 1.78
ORG_017Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 18.77 x 1.78
ORG_018Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 20.35 x 1.78
ORG_019Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 21.95 x 1.78
ORG_020Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 23.52 x 1.78
ORG_021Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 25.12 x 1.78
ORG_022Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 26.70 x 1.78
ORG_023Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 28.30 x 1.78
ORG_024Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 29.87 x 1.78
ORG_025Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 31.47 x 1.78
ORG_026Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 33.05 x 1.78
ORG_027Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 34.65 x 1.78
ORG_028Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 37.82 x 1.78
ORG_029Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 41.00 x 1.78
ORG_030Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 44.17 x 1.78
ORG_031Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 47.35 x 1.78
ORG_032Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 50.52 x 1.78
ORG_033Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 53.70 x 1.78
ORG_034Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 56.87 x 1.78
ORG_035Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 60.05 x 1.78
ORG_036Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 63.22 x 1.78
ORG_037Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 66.40 x 1.78
ORG_038Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 69.57 x 1.78
ORG_039Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 72.75 x 1.78
ORG_040Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 75.92 x 1.78
ORG_041Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 82.27 x 1.78
ORG_042Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 88.62 x 1.78
ORG_043Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 94.97 x 1.78
ORG_044Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 101.32 x 1.78
ORG_045Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 107.67 x 1.78
ORG_046Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 114.02 x 1.78
ORG_047Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 120.37 x 1.78
ORG_048Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 126.72 x 1.78
ORG_049Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
O-ring 133.07 x 1.78
ORG_050Attributes
DESIGNATIONSIZE_CODEID_MMCS_MMSTANDARDMATERIALHARDNESS_IRHDPART_NOMANUFACTURERQTYREMARKSDESC
Missing a symbol? Tell us which one.
Attributes for parts lists
Each block has the designation as a visible attribute (for example O-ring 29.87 x 3.53). The invisible attributes are SIZE_CODE, ID_MM, CS_MM, STANDARD, MATERIAL, HARDNESS_IRHD, PART_NO, MANUFACTURER, QTY and REMARKS. The size code, inside diameter and cross-section are already filled in; set the material and hardness to what you order.
Export the O-rings of an assembly drawing to Excel with BlockSync to get a parts list with size, material and quantity, and write corrections back in one run, with preview and backup.
How to use the library
- Unzip the file and open the DWG. Copy the symbols you need into your plan, or drag the blocks in from DesignCenter (ADCENTER).
- The rings are drawn at real size, 1 drawing unit = 1 mm: the inside circle is the inside diameter and the outside circle is the inside diameter plus twice the cross-section. Insert them at scale 1. Small rings are drawn small; the catalog sheet enlarges them only so that you can see them.
- The insertion point is the centre of the ring. The end view is on the left and the cut cross-section, two circles of the cross-section diameter above and below the centre line, is on the right, so you can use the same block in a plan view and in a section view. Explode the block and keep the view you need.
- The five libraries differ only by cross-section, so take the library of the cross-section you need and look up the size by its code or by its inside diameter. The block name is ORG_ followed by the size code, for example ORG_210.