Product Description

Features and benefits
1. a hardness range of **5 to **1 BHN and a charpy impact value of *0 ft-lbs are quaranteed for evenly distributed *6 points in any cross sections at room temperature;
2. connections are phophated coated after machining to protect the threads from corrosive elements and to provent galling upon initial make-up;
3. thread roots are cold rolled on API and H**0 connections;
4. pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections.
when ordering please specify
1. drill collar OD and ID;
2. overall length;
3. connections required(size and type)
4. special feature desired, for example: slick or spiral;
    stress relief features;
    slip and /or elevator recess,
    hardbanding;
Number and       Product  Outside Diameter Inside Diameter  Length   Bevel Diameter Bending Strength
connection table  Code        mm in                    mm in           mm           mm                 Ratio

NC****1 Z*1/Z*******0 *9.4 3 1/8 *1.8 1 1/4 ***0 *6.2 2.*7:1
NC****5(2 3/8 IF) Z*1/Z*******0 *8.9 3 1/2 *8.1 1 1/2 ***0 *4.5 2.*2:1
NC****1(2 7/8 IF) Z*1/Z*******0 **4.8 4 1/8 *0.8 2 ***0 **1.6 2.*3:1
NC****7 Z*1/Z*******0 **0.6 4 3/4 *0.8 2 ***0 **4.7 2.*8:1
NC****0(*1/2IF) Z*1/Z*******0 **7 5 *7.2 2 1/4 ***0 **1 2.*8:1
NC****0 Z*1/Z*******0 **2.4 6 *7.2 2 1/4 ***0 or ***0 **4.5 2.*9:1
NC****0 Z*1/Z*******0 **2.4 6 *1.4 2 *3/*6 ***0 or ***0 **4.5 2.*4:1
NC****2 Z*1/Z*******0 **8.8 6 1/4 *7.2 2 1/4 ***0 or ***0 **9.2 2.*1:1
NC****2(4IF) Z*1/Z*******0 **8.8 6 1/4 *1.4 2 *3/*6 ***0 or ***0 **0 2.*3:1
NC****5(4IF) Z*1/Z*******0 **5.1 6 1/2 *7.2 2 1/4 ***0 or ***0 **4.8 2.*6:1
NC****5(4IF) Z*1/Z*******0 **5.1 6 1/2 *1.4 2 *3/*6 ***0 or ***0 **4.8 3.*5:1
NC****7(4IF) Z*1/Z*******0 **1.4 6 3/4 *7.2 2 1/4 ***0 or ***0 **9.5 3.*8:1
NC****7(*1/2IF) Z*1/Z*******0 **1.4 6 3/4 *1.4 2 *3/*6 ***0 or ***0 **9.5 2.*7:1
NC****0(*1/2IF) Z*1/Z*******0 **7.8 7 *7.2 2 1/4 ***0 or ***0 **4.7 2.*4:1
NC****0(*1/2IF) Z*1/Z*******0 **7.8 7 *1.4 2 *3/*6 ***0 or ***0 **4.7 2.*3:1
NC****2(*1/2IF) Z*1/Z*******0 **4.2 7 1/4 *1.4 2 *3/*6 ***0 or ***0 **9.5 3.*2:1
NC****7 Z*1/Z*******0 **6.8 7 3/4 *1.4 2 *3/*6 ***0 or ***0 **5.3 2.*0:1
NC****0 Z*1/Z*******0 **3.2 8 *1.4 2 *3/*6 ***0 or ***0 **0.1 3.*2:1
6 5/8 REG Z*1/Z*******0 **9.6 8 1/4 *1.4 2 *3/*6 ***0 or ***0 **5.7 2.*3:1
NC****0 Z*1/Z*******0 **8.6 9 *1.4 2 *3/*6 ***0 or ***0 **2.7 3.*7:1
7 5/8 REG Z*1/Z*******0 **1.3 9 1/2 *6.2 3 ***0 or ***0 **3.8 2.*1:1
NC****7 Z*1/Z*******0 **7.6 9 3/4 *6.2 3 ***0 or ***0 **2.6 2.*7:1
NC*****0 Z*1/Z*******0 **4 *0 *6.2 3 ***0 or ***0 **7.3 2.*1:1
8 5/8 REG Z*1/Z*******0 **9.4 *1 *6.2 3 ***0 or ***0 **6.7 2.*4:1
note: Slips and elevator grooves can be produced upon the customers' requirement.