Standard_Parts_Catalogue

Page 1088 | 3.2 Mounting, Positioning, Leveling with Screws, Clamping and Supporting Elements The influence of a washer on the quality of the screwed connection is very often underestimated. With washers GN 6339, high quality preloaded screwed connections can be established. A high static clamping force can be reached avoiding loss of tension. At a specified preloaded clamping force it is often possible to use thinner bolts. This can result in a better ratio between clamping distance and bolt diameter to minimise the danger of failure. The case hardened smooth bolt head/screw contact face leads to a lower and more constant friction co-efficient even when continuous clamping and releasing operations are required. Washers GN 6339 are only suitable for machine construction bolts of classes 8.8 / 10.9 / 12.9, and not for steel bolts DIN 6914. Information GN 6339 Heavy Duty Washers 1 d 1 2 d 2 3 s 4 Finish How to order 1 2 3 4 GN6339-20,5-37-5-BT • Steel, 1.7227 (42 CrMoS 4 V) - - Tempered to tensile strength Rm = 1220 ... 1400 N/mm² - - Fine turned and slide ground • Blackened BT • GEOMET 500-treated GO • ISO Fundamental Tolerances → Page 2151 • RoHS Specification 4 1 2 3 d 1 H13 d 2 h13 s d 3 H13 f For screws with thread Low type High type Low type High type Low type High type  6,3 12 17 2,5  3  7   0,6  1   M  6  8,4 16 21 2,5  4  9,5 0,75 1,5 M  8 10,4 20 25 3    4 11,5 0,75 1,5 M 10 12,5 24 30 3,5  6 14   1    2   M 12 14,5 28 36 3,5  6 16   1    2   M 14 16,5 30 40 4    6 18   1    2   M 16 18,5 34 44 5    8 21   1,5  2,5 M 18 20,5 37 44 5    8 23   1,5  2,5 M 20 22,5 40 50 5    8 25   1,5  2,5 M 22 24,5 44 50 5   10 27   1,5  3,5 M 24 28   50 60 6   10 31   1,5  3,5 M 27 31   56 68 6   10 34   1,5  3,5 M 30 37   66 - 7   - 40   2    - M 36