How to install screws on a half casement sliding window

Use the standard drill bit listed in the table to drill holes, the depth of the hole is greater than or equal to the depth of the door and window screws installed; be careful not to drill the hole into a cone, the chips do not fall in. Countersinking after drilling should not exceed 0.4 pitch depth, because countersinking is too large for door and window screws screwed in.

Tapping.

Using special taps for door and window screws with specified thread specifications, the length of the tapping must exceed the length of the door and window screws, for the through-hole to be tapped all the way through the hole; tapping accuracy determines the final standard tolerance band in the screw hole, the user should properly select the tapping method and lubrication, tapping blind holes should be appropriately hard to prevent breakage of the taps. After tapping, the threaded hole should be cleaned up, generally with a compressed air gun blowing, blind holes should also be used with radial holes of the long gun from the bottom up to clean up, you can also clean up the threaded holes with the cleaning method. When the threaded hole precision is high, special door and window screw bottom hole plug gauge should be used to check.

Installation.

In general holes, and make its distance from the surface to leave 0.25-0.75 turns of empty threads. A small number of installation of door and window screws and M14 × 2 or more coarse teeth door and window screws installation can be used "T" type slotted or threaded head simple tool installation, and pay attention to do not in the door and window screws installation shank to apply a large axial force in order to prevent " chaotic buckling ". Door and window screws installed, in order to check the formed standard internal threaded hole accuracy level, the corresponding level of available plug gauge test.

De-shank.