On 5/18/17 11:53 AM, jimlux wrote:
On 5/18/17 11:16 AM, Tim Shoppa wrote:
I'm very dubious that you need a tapped 4-40 hole to be threaded any
deeper
than 0.25". If you work with the machinist I'm sure you can come up with
some reasonable spec that does not require a bottoming tap and will save
you a lot of money.
Fixing the table formatting
Threads Fastener
Engaged Length 0.125 in
TPI 40
Diameter 0.112 in
mean Diam 0.0995 in Root Diam 0.087 in
Engaged area 0.0391 sq in Area 0.00594 sq in
Load 200 lb
Shear stress 5,119 psi Stress 33,644 psi
Ultimate strength 42 ksi ultimate 74 ksi
Shear Strength 24,249 psi proof 55,000 psi
Safety factor 4.74 Safety factor 1.63
Aluminum Steel
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