Name: Drill Pipe
Brand: ZC Steel Pipe

Standard

API Spec 5DP, API Spec 7-2, RP7G

Grades

4 grades

Size Range

OD 2⅜"–6⅝"; Range R1, R2, R3

Applications

→ Oil and gas exploration and development — primary drilling string component transmitting torque and conveying drilling fluid
→ Geothermal drilling — high-temperature well drilling applications
→ Water well drilling — deep water well boreholes
→ Directional and horizontal drilling — IEU and NC-series tool joints for deviated wells

Physical & Mechanical Properties

Property	Value / Range
Standard	API Spec 5DP, API Spec 7-2, RP7G
Grades	E-75, X-95, G-105, S-135
PSL	PSL-1, PSL-2, PSL-3
OD range	2⅜″ – 6⅝″
Length range	R1, R2, R3
Application	Oil and gas, geothermal, and water well drilling
Internal coating	DPC, TC2000, TK-34, TK-34P, TK-34XT
Hard banding	ARNCO 100XT, ARNCO 300XT, BOTN 1000, BOTN 3000

API 5CT Mechanical Requirements by Grade

Grade	Min–Max Yield MPa / ksi	Min Tensile MPa / ksi	Max Hardness	Heat Treatment
H40	276–552 / 40–80	414 / 60	—	None required
J55	379–552 / 55–80	517 / 75	—	None required
K55	379–552 / 55–80	655 / 95	—	None required
N80-1	552–758 / 80–110	689 / 100	—	Normalise or Q+T
N80Q	552–758 / 80–110	689 / 100	—	Q+T only
L80-1	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80-3Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80-9Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80 13Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
R95	655–758 / 95–110	724 / 105	—	Q+T only
C90	621–724 / 90–105	689 / 100	25.4 HRC	Q+T only
T95	655–758 / 95–110	724 / 105	25.4 HRC	Q+T only
P110	758–965 / 110–140	862 / 125	None	Q+T only
C110	758–828 / 110–120	793 / 115	29.0 HRC	Q+T only
Q125	862–1034 / 125–150	931 / 135	None	Q+T only

API 5CT grades manufactured and supplied by ZC Steel Pipe. Grade selection is driven by well depth, H₂S environment, and pressure containment requirements.

Grade	Yield MPa / ksi	Tensile MPa / ksi	Max Hardness	H₂S Service	Typical Application

Sour Service Grade Selection

Procurement Note — H₂S Grade Selection Never substitute P110 or Q125 for a sour-service grade based on cost or availability pressure. NACE MR0175 hardness limits exist to prevent sulphide stress cracking — a brittle fracture mode with no ductile warning in H₂S environments. The correct escalation path is L80 → T95 → C110 depending on H₂S partial pressure and well depth.

Condition	Correct Grade
Mild sour, moderate pressure	L80-1 PSL-2 (+ SR16 HIC test if required)
Moderate sour, high pressure	T95 Type 2 PSL-2 with NACE qualification
Severe sour, high pressure / HPHT	C110 PSL-2 with full NACE + Charpy
Deep HPHT, sweet (no H₂S)	P110 PSL-2 or Q125 PSL-2

Technical Guides for Each Grade

API Spec 5DP drill pipe tube-body tensile requirements (Table C.5). Standard grades E75 through V150, plus the sulfide-stress-cracking-resistant sour-service grades SS75 / SS95 / SS105 — these carry a capped maximum yield, an added tensile ceiling, and tighter phosphorus/sulfur limits for H₂S service. Tool joints carry their own tensile requirements; see the full spec table.

Grade	Min Yield ksi (MPa)	Max Yield ksi (MPa)	Min Tensile ksi (MPa)	Max Tensile ksi (MPa)	Service
E75	75 (517)	105 (724)	100 (689)	—	Standard
SS75	75 (517)	95 (655)	100 (689)	115 (793)	Sour (SSC)
X95	95 (655)	125 (862)	105 (724)	—	Standard
SS95	95 (655)	110 (758)	105 (724)	130 (896)	Sour (SSC)
SS105	105 (724)	120 (827)	115 (793)	140 (965)	Sour (SSC)
G105	105 (724)	135 (931)	115 (793)	—	Standard
S135	135 (931)	165 (1138)	145 (1000)	—	Standard
V150	150 (1034)	170 (1172)	160 (1103)	190 (1310)	Standard

Standards

API Spec 5DP — Drill pipe specification — mechanical properties, dimensions, and testing
API Spec 7-2 — Threading and gauging of rotary shouldered connections (tool joints)
RP7G — Recommended practice for drill stem design and operating limits

ZC supplies API 5DP drill pipe in OD 2⅜″ to 6⅝″ with external (EU), internal (IU) and internal-external (IEU) upsets and rotary shouldered tool joints per API Spec 7-2. Standard length ranges: R1 20–23 ft, R2 29–32 ft, R3 40–45 ft. The table below is the full API 5DP dimensional matrix.

OD (in)	Wt (lb/ft)	Grade	Upset	Tool Joint	Pipe OD (mm)	WT (mm)	Joint OD (mm)	Est Wt (kg/m)
2⅜″	6.65	E75, SS75	EU	NC26	60.33	7.11	85.73	10.48
2⅜″	6.65	X95, G105, SS95, SS105	EU	NC26	60.33	7.11	85.73	10.48
2⅞″	10.40	E75, SS75	EU	NC31	73.03	9.19	104.78	16.30
2⅞″	10.40	X95, G105, SS95, SS105	EU	NC31	73.03	9.19	104.78	16.41
2⅞″	10.40	S135, V150	EU	NC31	73.03	9.19	111.13	17.20
3½″	9.50	E75, SS75	EU	NC38	88.90	6.45	120.65	15.95
3½″	13.30	E75, SS75	EU	NC38	88.90	9.35	120.65	20.91
3½″	13.30	X95, SS95	EU	NC38	88.90	9.35	127.00	21.68
3½″	13.30	G105, SS105	EU	NC38	88.90	9.35	127.00	21.85
3½″	13.30	S135, V150	EU	NC38	88.90	9.35	127.00	22.19
3½″	15.50	E75, SS75	EU	NC38	88.90	11.40	127.00	24.87
3½″	15.50	X95, SS95	EU	NC38	88.90	11.40	127.00	25.02
3½″	15.50	G105, SS105	EU	NC38	88.90	11.40	127.00	24.96
3½″	15.50	S135, V150	EU	NC40	88.90	11.40	139.70	25.79
4″	14.00	E75, SS75	EU	NC46	101.60	8.38	152.40	23.65
4″	14.00	X95, G105, SS95, SS105	EU	NC46	101.60	8.38	152.40	23.65
4″	14.00	S135, V150	EU	NC46	101.60	8.38	152.40	23.93
4½″	13.75	E75, SS75	EU	NC50	114.30	6.88	168.28	23.69
4½″	16.60	E75, SS75	EU	NC50	114.30	8.56	168.28	27.50
4½″	16.60	X95, G105, SS95, SS105	EU	NC50	114.30	8.56	168.28	27.50
4½″	16.60	S135, V150	EU	NC50	114.30	8.56	168.28	27.83
4½″	20.00	E75, SS75	EU	NC50	114.30	10.92	168.28	32.98
4½″	20.00	X95, G105, SS95, SS105	EU	NC50	114.30	10.92	168.28	33.14
4½″	20.00	S135, V150	EU	NC50	114.30	10.92	168.28	33.72
4″	14	E75, SS75	IU	NC40	101.60	8.38	133.40	22.22
4″	14	X95, SS95	IU	NC40	101.60	8.38	133.40	22.34
4″	14	G105, SS105	IU	NC40	101.60	8.38	139.70	23.14
4″	14	S135, V150	IU	NC40	101.60	8.38	139.70	23.48
4½″	13.75	E75, SS75	IU	NC46	114.30	6.88	152.40	22.31
4½″	16.60	E75, SS75	IEU	NC46	114.30	8.56	158.75	27.68
4½″	16.60	X95, G105, SS95, SS105	IEU	NC46	114.30	8.56	158.75	27.95
4½″	16.60	S135, V150	IEU	NC46	114.30	8.56	158.75	28.22
4½″	20.00	E75, SS75	IEU	NC46	114.30	10.92	158.75	27.68
4½″	20.00	X95, SS95	IEU	NC46	114.30	10.92	158.75	33.11
4½″	20.00	G105, SS105	IEU	NC46	114.30	10.92	158.75	33.38
4½″	20.00	S135, V150	IEU	NC46	114.30	10.92	158.75	33.60
5″	19.50	E75, SS75	IEU	NC50	127.00	9.19	168.28	31.79
5″	19.50	X95, SS95	IEU	NC50	127.00	9.19	168.28	32.58
5″	19.50	G105, SS105	IEU	NC50	127.00	9.19	168.28	32.95
5″	19.50	S135, V150	IEU	NC50	127.00	9.19	168.28	33.60
5″	19.50	E75, SS75	IEU	5½ FH	127.00	9.19	177.80	33.22
5″	19.50	X95, G105, SS95, SS105	IEU	5½ FH	127.00	9.19	177.80	33.61
5″	19.50	S135, V150	IEU	5½ FH	127.00	9.19	184.15	34.89
5″	25.60	E75, SS75	IEU	NC50	127.00	12.70	168.28	40.73
5″	25.60	X95, SS95	IEU	NC50	127.00	12.70	168.28	41.80
5″	25.60	G105, SS105	IEU	NC50	127.00	12.70	168.28	42.11
5″	25.60	E75, SS75	IEU	5½ FH	127.00	12.70	177.80	42.14
5″	25.60	X95, SS95	IEU	5½ FH	127.00	12.70	177.80	42.51
5″	25.60	G105, SS105	IEU	5½ FH	127.00	12.70	184.15	43.35
5″	25.60	S135, V150	IEU	5½ FH	127.00	12.70	184.15	43.75
5″	TW 0.750	S135, V150	IEU	5½ FH	127.00	19.05	184.15	57.29
5½″	21.90	E75, SS75	IEU	5½ FH	139.70	9.17	177.80	35.43
5½″	21.90	X95, SS95	IEU	5½ FH	139.70	9.17	177.80	36.36
5½″	21.90	G105, SS105	IEU	5½ FH	139.70	9.17	184.15	37.38
5½″	21.90	S135, V150	IEU	5½ FH	139.70	9.17	190.50	38.87
5½″	24.70	E75, SS75	IEU	5½ FH	139.70	10.54	177.80	39.54
5½″	24.70	X95, G105, SS95, SS105	IEU	5½ FH	139.70	10.54	184.15	41.04
5½″	24.70	S135, V150	IEU	5½ FH	139.70	10.54	190.50	42.52
5½″	TW 0.500	S135, V150	IEU	5½ FH	139.70	12.70	184.15	46.30
5½″	TW 0.625	S135, V150	IEU	5½ FH	139.70	15.88	184.15	54.57
5½″	TW 0.750	S135, V150	IEU	5½ FH	139.70	19.05	190.50	62.86
5⅞″	23.40	E75, SS75	IEU	5½ FH	149.23	9.17	177.80	37.80
5⅞″	23.40	X95, SS95	IEU	5½ FH	149.23	9.17	184.15	39.35
5⅞″	23.40	G105, SS105	IEU	5½ FH	149.23	9.17	184.15	39.35
5⅞″	23.40	S135, V150	IEU	5½ FH	149.23	9.17	184.15	40.00
5⅞″	26.30	E75, SS75	IEU	5½ FH	149.23	10.54	177.80	42.86
5⅞″	26.30	X95, G105, SS95, SS105	IEU	5½ FH	149.23	10.54	184.15	43.31
5⅞″	26.30	S135, V150	IEU	5½ FH	149.23	10.54	190.50	44.48
5⅞″	TW 0.625	S135, V150	IEU	5½ FH	149.23	15.88	190.50	59.72
5⅞″	TW 0.750	S135, V150	IEU	5½ FH	149.23	19.05	190.50	67.77
5⅞″	TW 0.813	S135, V150	IEU	5½ FH	149.23	20.65	190.50	72.19
6⅝″	25.20	E75, SS75	IEU	6⅝ FH	168.28	8.38	203.20	40.91
6⅝″	25.20	X95, SS95	IEU	6⅝ FH	168.28	8.38	203.20	40.91
6⅝″	25.20	G105, SS105	IEU	6⅝ FH	168.28	8.38	209.55	42.34
6⅝″	25.20	S135, V150	IEU	6⅝ FH	168.28	8.38	215.90	44.26
6⅝″	27.70	E75, SS75	IEU	6⅝ FH	168.28	9.19	203.20	43.63
6⅝″	27.70	X95, G105, SS95, SS105	IEU	6⅝ FH	168.28	9.19	209.55	45.06
6⅝″	27.70	S135, V150	IEU	6⅝ FH	168.28	9.19	215.90	46.97
6⅝″	TW 0.522	S135, V150	IEU	6⅝ FH	168.28	13.26	215.90	57.34
6⅝″	TW 0.625	S135, V150	IEU	6⅝ FH	168.28	15.88	215.90	67.22
6⅝″	TW 0.750	S135, V150	IEU	6⅝ FH	168.28	19.05	215.90	77.96
6⅝″	TW 0.813	S135, V150	IEU	6⅝ FH	168.28	20.65	215.90	83.16

Dimensions and mass per API 5DP Annex D (SI units). "Wt" is the nominal weight designation in lb/ft; "TW" is a thick-wall variant. "Grades" lists the API 5DP body grades sharing that configuration; the sour-service SS75/SS95/SS105 grades share the dimensions of the E75/X95/G105 rows respectively. Contact ZC to confirm a specific OD × weight × grade × upset × tool-joint combination.

Procurement Note Specific OD × weight × grade × upset × tool joint combinations subject to mill availability — contact for confirmation. Full size matrix available on request for project specification.

📊 View Complete API 5DP Specification Table →

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Drill Pipe

Applications

Physical & Mechanical Properties

API 5CT Mechanical Requirements by Grade

Sour Service Grade Selection

Tool Joint Connections (API Rotary Shouldered)

Upset Types

Internal Coating Options

Hard Banding Options

Supply Enquiry — Drill Pipe