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 Pothead

link 30.01.2009 16:23 
Subject: patch engagement tech.
подскажите плз., что это и к чему (patch engagement )

речь идет об испытании/проверке качества винтов и болтов с метрической резьбой

контекст:

2.0 SPECIAL TEST EQUIPMENT
2.1 Threaded Adapter
The threaded adapter used in testing per this standard shall be made from gray cast iron material (hardness 187-241 BHN). The internal thread minor diameter must be to the maximum of a 6H tolerance thread plus 0 minus 0.1 mm. The tapped hole shall be countersunk on the bearing face or faces. The included countersink angle shall be 90 degrees plus or minus 5 degrees. The countersink diameter at the bearing surface shall be the basic major diameter of the thread plus 0.8 mm with a tolerance of plus or minus 0.25 mm for all sizes. The countersunk depth should be adjusted to properly accommodate the fastener length and the threaded section should be long enough to maintain a PATCH ENGAGEMENT at all times.

 

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