2. In the QB system, the FB and BB are numerically equal, but the quadrants are just opposite. a) For example, if the FB of AB is S 30° 00′ W. then its BB is N 30° 00 E (Fig (a)). (b) For example, if the FB of PQ is S 45° 00′ E, then its BB is N 45° 00′ W (Fig(b)).

Keps nut

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Locknut types

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In compass surveying, two bearings are observed for the each line, one from each end. Fore Bearing: The bearing of a line measured in the direction of the progress of survey is called Fore Bearing or Forward Bearing (FB) of a line AB Back Bearing: The bearing of a line measured in the direction opposite to the survey is called the Back Bearing or Backward Bearing (BB) of a line AB .

Self-locking nut

Locknut

1) The Fore bearing of PQ =79° 24′ Back bearing of PQ = FB + 180° (as the FB of PQ is less than 180°) = 79° 24′ + 180° 00′ = 259°24′ (2) The Fore bearing of RS = N 28° 12′ E Back bearing of RS = S 28 °12′ W

RC Fasteners & Components carries a huge selection of top quality metric fasteners. We offer DIN934 Class 8 and Class 10 metric hex nuts in plain and RoHS-compliant zinc and A2-70 stainless steel. We also stock Class 8 and Class 10 nylon-insert metric locknuts in RoHS compliant zinc, and DIN 6923 serrated and non-serrated flange locknuts.

1. In the WCB system, the difference between the FB and BB should be exactly 180°, BB =FB ±180° Note: Use the positive sign when FB is less than 180°, and the negative sign when it is greater than 180°. (a) For example, if the FB of AB is 0, then its BB is (0₁ + 180°) Fig.(a). (b) For example, if the FB of PQ is 02. then its BB is (02- 180°) Fig. (b).