Drill Pipe Threads
Drill Pipe Threads
(OP)
I am looking for specifications for 2" 4 TPI 10 degree tapered drill rod joints very similar to API but cannot find dimensions for 2" Have reference to a NC thread in tool suppliers catalougue but angle is wrong as well as diameter. Length of thread is 2" I have measured off a sample for the male tread(pin) and machined a sample which appears ok but female is a problem because of the size of the tool tip for 4TPI
best regards to all
Burgy
best regards to all
Burgy





RE: Drill Pipe Threads
1) Small diameter of pin: 2 1/16,
2) Gauge of thread: 4 TPI,
3) Pin length: 3 inches,
4) Large diameter of pin: 2 9/16,
5) Thread form: V-0.038R.
Doing the math, the half angle of the pin is 4.76 degrees, I would get 10 degrees full angle, correctly corresponding to the listed 2 in/ft.
I realize you have mentioned attempting to source the NC catalogue to no avail. You may be right, nothing listed with pin length of two inches even. Perhaps you're dealing with a bastardized thread?
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Drill Pipe Threads
RE: Drill Pipe Threads
RE: Drill Pipe Threads
This is common in environmental & DCDMA products.
RE: Drill Pipe Threads
RE: Drill Pipe Threads
surfed up and down the net and found NWJ and it is used with 2 5/8" rods which all looks good. Now I only have to find the dimensions.
RE: Drill Pipe Threads
Although I have access to most drill pipe thread dimensions, I do not have the NWJ.
I don't know what you are making but there are a few options for your consideration.
1) Have a manufacturer thread the NWJ for you.
2) Purchase a sample piece with NWJ male x female
3) If you plan to do a lot of this work, you can purchase thread gages that would come with specifications.
Some companies that machine this connection are Penndrill (pittsburgh) 800-245-2115, Acker Drill 570-586-2061, to name a couple.
You can reach me at 717-328-4988
Dave
RE: Drill Pipe Threads
I maintain a small fleet of drills for a customer. Repairing and updating as required. He has recently changed from NW threads to this new thread and he wants me to make the rods subs ect.
I am in the process of manufacturing a new gearbox and modifying the other gearboxs to the tapered thread as well. Hence knowing the exact measurements and type of thread would be very beneifical. As you suggest purchase of thread gauges may be my best way to go. I have samples that I have measured and have made the pin but will need to manufacture a specical tool for the box. Also noted on one of the web sites that the NWJ is a modified Acme thread but the measurements I came up with is 60 degree.
Best regards
Burgy
RE: Drill Pipe Threads
Have your customer contact the rig manufacturer (if he recently bought a rig with the NWJ) or where he purchased the NWJ tooling. Have him ask for the thread drawings. If he says he has a local shop make special tools for him, I think they will send the drawings.
Meanwhile, I try to get some drawings.
Once you see the thread form, you can probably purchase some form threading tools.
Dave