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121 drill collar
121 drill collar

Minimum Order: 0
Quality/Safety Certification: 0.00


The drill collar is according to SY/T5144-1997 and API 7-1 " Specification for Rotary Drill Stem Elements" standard

 The drill collar is according to SY/T5144-1997 and API 7-1 " Specification for Rotary Drill Stem Elements" standard, the material uses AISI 4145H alloy structural steel to carry on the deep hole processing, before thread and spiral groove processing against the total cross-section to quenching and the tempering heat treatment. After thread examination qualified, and carries on cold rolling processing to the thread root and the slips, reduces the thread part fatigue failure to increase the drill collar service life.

 

Drill collar dimension Specifications
ThreadtypeD/ODD/IDL mmTaiwan shoulder
chamfer diameter
Reference
 bending
strength ratio
mminmminDF mm
NC23-3179.43 1/831.81 1/4915076.22.57:1
NC26-35(2 3/8IF)88.93 1/238.11 1/2915082.92.42:1
NC31-41(2 7/8IF)104.84 1/850.829150or9450100.42.43:1
NC35-47120.74 3/450.829150or9450114.72.58:1
NC38-50(3 1/2IF)127.05   57.22 1/49150or9450121.02.38:1
NC44-60152.46   57.22 1/49150or9450144.52.49:1
NC44-62158.86 1/457.22 1/49150or9450149.22.91:1
NC46-62(4IF)158.86 1/457.22 13/169150or9450150.02.63:1
NC46-65(4IF)165.16 1/271.42 1/49150or9450154.82.76:1
NC46-65(4IF)165.16 1/257.22 13/169150or9450154.83.05:1
NC46-67(4IF)171.46 3/471.42 1/49150or9450159.53.18:1
NC50-67(4 1/2IF)171.46 3/457.22 13/169150or9450159.52.37:1
NC50-70(4 1/2IF)177.87   71.42 1/49150or9450164.72.54:1
NC50-70(4 1/2IF)177.87   57.22 13/169150or9450164.72.73:1
NC50-72(4 1/2IF)184.27 1/471.42 13/169150or9450169.53.12:1
NC50-77196.87 3/471.42 13/169150or9450185.32.70:1
NC50-80203.28   71.42 13/169150or9450190.13.02:1
6 5/8REG209.68 1/471.42 13/169150or9450195.62.93:1
NC61-90228.69   71.42 13/169150or9450212.73.17:1
7 5/8REG241.39 1/276.23     9150or9450223.82.81:1
NC70-97247.69 3/476.23     9150or9450232.62.57:1
NC70-100254.01076.23     9150or9450237.32.81:1

 

AB Type Drill collar mechanical properties
OD scopeYield strength
 Mpa 
Tensile strength
 Mpa
Elongation
 %
Brinell har
dness HB
Charpy im
pact J
mmin
79.4-174.63 1/8-6 7/8≥758≥965≥13≥285≥54
177.8-279.47-11≥689≥931≥13≥285≥54

 

C Type Drill collar mechanical properties
OD scopeYield strength
 Mpa
Tensile strength
 Mpa
Elongation
 %
mmin
89.9-174.63 1/2-6 7/8≥758≥827≥18
177.8-279.47-11≥689≥758≥20

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