Coupler Screws

I always file off the ears use 2-56 screws in the middle and rear if I can. If the mounting pad will not allow it I put screws in the side holes. Ken the guy from AR

Using an adhesive on the stripped hole might work but it depends on how badly it's stripped.  Loctite® offers Threadlocker Blue 242®  It might be a better choice than ACC or J-B Weld in the event you need to remove the screw.  Check the Loctite® website for product details/warnings and other adhesives.

 

J-B Weld offers a medium threadlocker but it's recommended for screws 1/4"- 1".

 

Matt

 

Hi Ed

 

In 40 years of running I've never had a coupler pocket screw sheer off - but I've had quite a few vibrate loose. I always use two screws - not for strength, but to assure that the pocket stays in alignment with the centerline of the car. To address normal vibration I put a very light dab of Locktite on the screw threads - but I wouldn't trust it as replacement for thread contact. In most cases for stripped threads I re-tap the hole for the next size larger screw - going from Metric to English or vice versa. Imported brass models typically have 2mm coupler pocket screws. For those I re-tap the hole for 2-56 - works like a charm. NWSL offers a complete selection of small screws and taps. I particularly find useful their phillips cap head 2 mm x 9mm blackened steel screws for replacing plated brass screws often found on brass imports - many of which are a tad short for mounting a Kadee pocket. Also with a magnetized screw driver you can navigate them into tight places under car bodies.

 

 

Ed Rappe

I am with Ed above. Makes no difference what size, but 2-56 is easier to deal with.  I personally use socket head cap screws, which are 125,000 psi steel, but brass is plenty strong enough.

 

I would use all hex head, but they are no longer economically available in steel.

 

Be careful about taps.  There are good ones and bad ones.  Do not bother with the ones from hobby stores - look for Greenfield, or some quality tap.  And use appropriate fluid.

 

Check out Micro Fasteners - they have fairly good taps.  The best are only available through good wholesalers or machinery supply places.  Micro Fasteners also sells screws cheaper than your local hardware store.

Hi All,

Thanks for the suggestions.  I do appreciate it.

Regards,

Ed