: A standardized way to order parts based on their dimensions (e.g., indicates a 90mm diameter with a 3.1mm cross-section). Key PDF Resources
Look for a table labeled "Rubber Compounds." GB1235-76 lists:
Disclaimer: This article is for informational purposes. The GB1235-76 standard is the property of the Standardization Administration of China. Always purchase official standards for certified engineering work. gb1235-76 pdf
This article serves two purposes. First, we will explain exactly what GB1235-76 is, its specifications, and why it still matters today. Second, we will guide you on how to source a legitimate copy of the for your engineering library.
| O-Ring CS (mm) | Groove Depth (mm) | Groove Width (mm) | Radial Compression (%) | | :--- | :--- | :--- | :--- | | 1.8 | 1.35 - 1.40 | 2.2 | 22-25% | | 2.4 | 1.85 - 1.90 | 2.8 | 22-25% | | 3.1 | 2.45 - 2.50 | 3.6 | 20-23% | : A standardized way to order parts based
Because the standard is obsolete and not enforced, engineering forums (Practical Machinist, Hydraulic Repair Network, or Chinese lang "Standard Sharing" sites) often host scanned copies. Be aware of poor scan quality—many scans from 2003 have illegible footnotes.
If you are working in the fields of heavy machinery, hydraulic systems, or industrial manufacturing, you have likely encountered the cryptic standard designation . For decades, this standard has been a cornerstone of Chinese hydraulic sealing technology. However, finding a reliable, legible gb1235-76 pdf has become a modern challenge. Servers shut down, old optical discs corrode, and search engines often lead to dead links. Second, we will guide you on how to
Note: Modern standards (ISO 3601-1) require wider grooves. Using a modern O-ring in a GB1235-76 groove will result in pinching and rapid failure.