Screws
A note on tapping holes
I normally specify a tapped hole depth of 1.5 dia for a fully threaded hole in a blind tapped hole (steel male and female). The depth of threaded hole if a plug tap is not used i.e for automatic one stage tapping would be deeper.
According to BS1936 the tapping drill should be have a depth greater than the tapped depth (clearance depth) as follows:
| Less than M6 | 0.25 x full thread depth |
|---|---|
| M6 TO M12 | 0.2 x full thread depth |
| Greater than M12 | 0.15 x full thread depth |
Pages in this section
- Anchors
- Bolt Loading Notes
- Bolted Joint
- Cap Screw Dimensions
- Din125 Washer
- Head Clearances
- Head Clearances
- Joint Stiffness
- Screw Locking and Retaining Methods
- Screw Thread Basics
- Screw thread Calculations
- Screw Ultimate Loads and Torques
- Screws Nuts Washer Sizes
- Screws Nuts Washer Sizes
- Strength Grade of Bolts and Screw
- Studs
- Thread Inserts
- Trapezoidal Threads