When measuring a handhole seat with a feeler gauge, what is the maximum allowed taper?

The maximum allowed taper when measuring a handhole seat with a feeler gauge is .008. This standard reflects the acceptable limits of variation in the surface of the handhole seat, ensuring that it maintains proper sealing and functional integrity. A taper exceeding this limit can compromise the effectiveness of the seat, leading to leaks or operational issues.

When measurements are taken, it's crucial for the surfaces in question to meet strict tolerances. The .008 taper provides a balance between operational performance and manufacturing realities, ensuring that components can function optimally while allowing for minor imperfections that may arise during machining. Maintaining this maximum taper is essential for the overall performance and longevity of the system.