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Drill Collar
3 1/8in
(79.4mm)
NC23-31,
3 1/2in
(88.9mm)
NC26-35(2 3/8IF),
4 1/8in
(104.8mm)
NC31-41(2 7/8IF),
4 3/4in
(120.7mm)
NC35-47,
5in
(127.0mm)
NC38-50(3 1/2IF),
6in
(152.4mm)
NC44-60, NC44-60,
6 1/4in
(158.8mm)
NC44-62,
6 1/2in
(165.1mm)
NC46-65(4IF), NC46-65(4IF),
6 3/4in
(171.4mm)
NC46-67(4IF), NC50-67(4 1/2IF),
7in
(177.8mm)
NC50-70(4 1/2IF), NC50-70(4 1/2IF),
7 1/4in
(184.2mm)
NC50-72(4 1/2IF),
7 3/4in
(196.8mm)
NC56-77,
8in
(203.2mm)
NC56-80,
8 1/4in
209.6mm)
6 5/8 REG,
9in
(228.6mm)
NC61-90,
9 1/2in
(241.3mm)
7 5/8 REG,
9 3/4in
(247.6mm)
NC70-97,
10in
(254.0mm)
NC70-100,
11in
(279.4mm)
8 5/8 REG,

Drill Collar

Nomenclature

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