Standard_Parts_Catalogue

Page 1592 | 3.5 Controlling, Venting, Sealing of Liquids and Gases GN 749 Threaded Plugs Steel, Zinc Plated 1 d1 2 Type How to order 1 2 GN 749-G¾-A 2 Type A Seal rubber NBR (Perbunan ® ) B Sealing ring rubber FPM (Viton ® ) The dimensions of the threaded plugs GN 749 comply with DIN 908, but deviating from the latter is the elastic sealing ring (rubber). This sealling ring is retained in a radial undercut in the mating face which prevents it from dropping out and in particular it does not extrude when the plug is tightened. The details relating to the permissible operating pressure are non-bin- ding recommended values and rule out any liability. They constitute no general warranty of quality and condition. The user must determine from case to case whether a product is suitable for the intended use. see also... • Threaded Plugs GN 746 (Plastic) → Page 1598 Information • Steel - - Property class 5.8 - - Ultrasonically and tensile tested - - Zinc plated, nano-passivated (silver / yellowish) • Type A - - Temperature resistant up to 100 °C - - Seal rubber NBR (Perbunan ® ) • Type B - - Temperature resistant up to 180 ° C - - Seal rubber FPM (Viton ® ) Identification by not black finish of the seal • ISO Fundamental Tolerances → Page 2151 • Elastomer Characteristics → Page 2158 • RoHS Specification 1 d 1 d 2 h14 d 3 l 1 l 2 s Max. permissible operating pressure in bar Recommended tightening torque in Nm M  8 x 1   - - 12  9,9  8 4 4 400   8 M 10 x 1   - G 1 ⁄ 8 14 11,9  8 4  5 400  12 M 12 x 1,5 - - 17 14,4 12 5  6 400  25 M 14 x 1,5 - G 1 ⁄ 4 19 16,5 12 5  6 400  30 M 16 x 1,5 - G 3 ⁄ 8 22 18,9 12 5  8 400  50 M 18 x 1,5 - - 24 20,9 12 5  8 400  60 M 20 x 1,5 - - 26 22,9 14 5 10 400  70 M 22 x 1,5 - 27 24,3 14 5 10 400  80 - - G 1 ⁄ 2 27 23,9 14 5 10 400  80 M 24 x 1,5 - - 30 26,9 14 5 12 400  95 M 26 x 1,5 M 27 x 2 G 3 ⁄ 4 32 29,2 16 5 12 400 120 M 30 x 1,5 - - 37 32,7 16 6,5 17 400 190 - M 33 x 2 G 1 40 35,7 16 6,5 17 400 225 - M 42 x 2 G 1 1 ⁄ 4 50 45,8 16 6,5 22 315 360 - M 48 x 2 G 1 1 ⁄ 2 55 50,7 16 6,5 24 315 400