2-3/8" Mayhew Junior Drill Rod for mining exploration core drilling

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114mm-dth-drill-rod
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2-7/8”Mayhew Junior Drill Rod

2-7/8" Mayhew Junior Drill Rod

2-3/8" Mayhew Junior Drill Rod


2-3/8" Mayhew Regular Drill Rod


2-7/8" Mayhew Regular Drill Rod


Drill pipe is designed to allow the introduction of a drilling fluid or air to the bit and to provide the mechanism to transfer energy developed by the drill motor to the bit.   

The correct selection of drill pipe, in most instances, determine how successful you are and what options you have as far as depth, bore hole size, and push and pull down ability.   

The selection of drill pipe is one of the most important decisions mainly due to cost and rig capability.  

Below is a breakdown of what the most popular drill pipes are and their benefits.  


Mayhew Jr (Junior) drill pipe engineered with weld on joints
NC26
2-7/8" IF modified drill pipe:
2-7/8" FEDP drill pipe:
3-1/2" API drill pipe:

Description Pipe OD Pipe Wall Connection OD Connection ID Length(ft)
2-3/8 IF Flush 3 1/2 0.375 3 1/2 1 3/4 20
2-3/8 IF 2 3/8 .280/254 3 1/2 1 3/4 10, 15, 20
2-3/8 FEDP 2 3/8 .280/254 3 1/8 1 1/2 10, 15, 20
2-3/8 Mayhew Jr 2 3/8 .280/254 3 1 1/2 10, 15, 20
2-3/8 Mayhew Jr 2 3/8 0.19 2 3/4 1 1/2 5, 10
2-7/8 Mayhew Jr Pipe Flush 2 7/8 0.362 2 7/8 1 1/2 10, 15, 20
Mayhew Reg. Flush 3 1/2 0.375 3 1/2 1 1/2 20
Mayhew Reg. 2 3/8 .280/254 3 1/2 or 3 1/4 1 1/2 10, 15, 20
2-7/8 IF 4 1/2 0.337 4 1/8 2 1/2 10, 15, 20
3-1/2 IF 5 1/2 0.362 4 3/4 2 11/16 10, 15, 20
3-1/2 API Reg Flush 4 1/2 0.337 4 1/2 1 1/2 10, 15, 20
4-1/2 API Reg Flush 5 1/2 .362/.478 5 1/2 2 1/4 10, 15, 20
AWJ/AW w/Flats 1 3/4 .188/.250 1 3/4 5/8 5,10
NWJ/NW w/Flats 2 5/8 .188/.250 2 5/8 1-1/4 or 1-3/8 5,10


Mayhew Junior Rods
 
We manufacture drill rods from seamless tubing and hardened & tempered alloy steel tool joints.
All our tool joints are pre-machined and heat treated before final machining to ensure accuracy.
All threads are gauged to international standards to ensure interchangebility on existing rods irrespective of supplier.
 
We manufacture a wide variety of rods which include conventional, RC and aircore flush.
 
Our drill rods can be supplied in a variety of different threads which include Remet, Metzke, Api, ARD, Api internal flush, Junior Mayhew and so forth.
 
We also manufacture reverse circulation drill pipe, and reverse circulation  stainless steel RC rods.  


 

Specifcations of Drill Pipe
Name A B C D E F G H
TOOL JOINTS:1  
2 3/8 API Regular 2-3/8" 3-1/8" 2-5/8" 3 5 3 60° API 1
2 7/8 API Regular 2-7/8" 3 3/4 3 3 1/2 5 3 60° API 1 1/4
3 1/2 API Regular 3 1/2 4 1/4 3 1/2 3 3/4 5 3 60° API 1 1/2
4 1/2 API Regular 4 1/2 5 1/2 4-5/8" 4 1/4 5 3 60° API 1 1/4
2 3/8 API Internal Flush 2-3/8" 3-3/8" 2-7/8" 3 4 2 60° API 1 3/4
2 7/8 API Internal Flush 2-7/8" 4-1/8" 3 25/64 3 1/2 4 2 60° API 2-1/8"
3 1/2 API Internal Flush 3 1/2 4 3/4 4  1/64 4 4 2 60° API 2 11/16
2 3/8 Mayhew Junior 2-3/8" 2 3/4 2 21/64 2 1/4 4 2 60° Mod. API 1 1/2
2 3/8 Mayhew Regular 2-3/8" 3 1/4 2 35/64 3 4 1 1/2 60° Mod. API 1-5/8"
2 7/8 Mayhew Full Hole 2-7/8" 3 3/4 3  3/64 3-3/8" 4 1 1/2 60° Mod. API 2
2 3/8 Failing Exploration 2-3/8" 2 31/32 2 1/2 2 3/4 4 2 60° Mod. API 1 1/2
2 7/8 Failing Exploration 2-7/8" 3 3/4 3-1/8" 3 1/4 4 2 60° Mod. API 1-7/8"
2 3/8 Hughes Acme Regular 2-3/8" 3-1/8" 219/32 3 4 3-3/8" 29° Acme 1
2 3/8 Winter Weiss 2-3/8" 3 1/4 235/64 3 4 1 1/2 60° Mod. API 1 1/2
2 7/8 Winter Weiss 2-7/8" 37/16 235/64 3 4 1 1/2 60° Mod. API 1 1/2
3 1/2 API Full Hole 3 1/2 4-5/8" 4 3 3/4 5 3 60° Mod. API 27/16
FLUSH JOINT TAPERED THREAD  
United Geophysical (1 11/16 OD) 111/16 111/16 1-3/8" 1 6 3 29° Acme 1