API Reference Tables

API 5DP — Complete Drill Pipe Specification Tables

Q: What grades of drill pipe does API 5DP cover?

API 5DP covers five standard drill pipe body grades — E75 (75 ksi min yield), X95, G105, S135, and V150 (150 ksi, the highest) — plus three sulfide-stress-cracking-resistant sour-service grades: SS75, SS95, and SS105. The SS grades carry a capped maximum yield and additional tensile ceiling, with tighter phosphorus and sulfur limits, for improved resistance in H₂S environments.

Q: What is the difference between EU, IU, and IEU drill pipe upsets?

The upset is the thickened, forged section at each end of the tube where the tool joint is welded. EU = external upset (thickened on the outside only), IU = internal upset (thickened on the inside only), and IEU = internal-external upset (thickened both inside and outside). IEU is the most common on modern drill strings because it gives the largest cross-section at the weld for the highest connection strength while keeping a smooth internal bore.

Q: What tool joint connections are used on API 5DP drill pipe?

API 5DP drill pipe uses rotary shouldered connections (RSC). Across the size range the connections are the Numbered Connection (NC) series — NC26, NC31, NC38, NC40, NC46 and NC50 — and the Full Hole (FH) series: 4½ FH, 5 FH, 5½ FH and 6⅝ FH. Larger and higher-grade pipe uses the larger connections. Thread details are defined in API Spec 7-2.

Q: Does API 5DP specify a full chemical composition?

No. API 5DP restricts only phosphorus (P) and sulfur (S); the balance of the chemistry is left to the manufacturer to meet the specified mechanical properties. For the tube body: Grade E75 allows P ≤ 0.030% and S ≤ 0.020%; grades X95/G105/S135/V150 allow P ≤ 0.020%, S ≤ 0.015%; and the sour-service SS grades are tightest at P ≤ 0.015%, S ≤ 0.010%.

Q: What are the standard length ranges for drill pipe?

Drill pipe is supplied in three ranges: Range 1 (about 20–23 ft), Range 2 (about 29–32 ft, the most common), and Range 3 (about 40–45 ft). Range 2 is standard for most rotary rigs, while Range 3 reduces the number of connections to make up on deep wells. Each range has order-tolerance limits on maximum length variation and minimum length.

Q: What is the minimum yield strength of the tool joint versus the tube body?

The tool joint and the tube body have separate tensile requirements. For grades E/X/G/S/V the tool joint has a minimum yield of 120,000 psi (827 MPa) and minimum tensile of 140,000 psi (965 MPa), with 13% minimum elongation. Sour-service SS tool joints require 110,000 psi minimum yield with a 125,000 psi maximum, 125,000 psi minimum tensile, and 15% minimum elongation. The tube body minimums follow the grade name (e.g. E75 = 75,000 psi yield).

Full API 5DP drill pipe data: tube body and tool-joint dimensions and mass for every size from 2⅜″ to 6⅝″, by grade, upset type and rotary shouldered connection; tensile requirements for grades E75 through V150 (plus sour-service SS grades); and phosphorus/sulfur chemistry limits.

→ Drill Pipe → Grade Selector Tool → API 5CT Casing Tables

API 5DP Drill Pipe Specifications

API 5DP specifies steel drill pipe with upset ends and welded-on tool joints (rotary shouldered connections) for drilling and production. A joint of drill pipe is an assembly: the tube body, the forged upset, and the tool joint, each with its own dimensional and mechanical requirements.

Use these tables to find tube body OD and wall, tool-joint outside diameter, pin bore, bevel diameter and approximate mass by size, grade, upset and connection — plus grade tensile and chemistry requirements.

Table data transcribed from API 5DP Annexes C (US units) and D (SI units) and verified 2026-07-08. One printed value flagged — see the Dimensions note.

Showing 82 of 82 rows

API 5DP Drill Pipe Dimensions & Mass — tube body OD/wall, tool-joint OD, pin bore, bevel diameter and approximate mass by size, grade, upset and connection (API 5DP Tables C.1 / D.1, SI units)
OD	Nom. Wt	Grades	Upset	Connection	Body OD (mm)	Wall (mm)	Tool Joint OD (mm)	Pin ID (mm)	Bevel Ø (mm)	Mass (kg/m)
2 3/8″	6.65	E75, SS75	EU	NC26	60.33	7.11	85.73	44.45	82.96	10.48
2 3/8″	6.65	X95, G105, SS95, SS105	EU	NC26	60.33	7.11	85.73	44.45	82.96	10.48
2 7/8″	10.40	E75, SS75	EU	NC31	73.03	9.19	104.78	53.98	100.41	16.3
2 7/8″	10.40	X95, G105, SS95, SS105	EU	NC31	73.03	9.19	104.78	50.80	100.41	16.41
2 7/8″	10.40	S135, V150	EU	NC31	73.03	9.19	111.13	41.28	100.41	17.2
3 1/2″	9.50	E75, SS75	EU	NC38	88.90	6.45	120.65	68.28	116.28	15.95
3 1/2″	13.30	E75, SS75	EU	NC38	88.90	9.35	120.65	68.28	116.28	20.91
3 1/2″	13.30	X95, SS95	EU	NC38	88.90	9.35	127.00	65.10	116.28	21.68
3 1/2″	13.30	G105, SS105	EU	NC38	88.90	9.35	127.00	61.93	116.28	21.85
3 1/2″	13.30	S135, V150	EU	NC38	88.90	9.35	127.00	53.98	116.28	22.19
3 1/2″	15.50	E75, SS75	EU	NC38	88.90	11.40	127.00	65.10	116.28	24.87
3 1/2″	15.50	X95, SS95	EU	NC38	88.90	11.40	127.00	61.93	116.28	25.02
3 1/2″	15.50	G105, SS105	EU	NC38	88.90	11.40	127.00	53.98	116.28	24.96
3 1/2″	15.50	S135, V150	EU	NC40	88.90	11.40	139.70	57.15	127.41	25.79
4″	14.00	E75, SS75	EU	NC46	101.60	8.38	152.40	82.55	145.26	23.65
4″	14.00	X95, G105, SS95, SS105	EU	NC46	101.60	8.38	152.40	82.55	145.26	23.65
4″	14.00	S135, V150	EU	NC46	101.60	8.38	152.40	76.20	145.26	23.93
4 1/2″	13.75	E75, SS75	EU	NC50	114.30	6.88	168.28	95.25	154.00	23.69
4 1/2″	16.60	E75, SS75	EU	NC50	114.30	8.56	168.28	95.25	154.00	27.5
4 1/2″	16.60	X95, G105, SS95, SS105	EU	NC50	114.30	8.56	168.28	95.25	154.00	27.5
4 1/2″	16.60	S135, V150	EU	NC50	114.30	8.56	168.28	88.90	154.00	27.83
4 1/2″	20.00	E75, SS75	EU	NC50	114.30	10.92	168.28	92.08	154.00	32.98
4 1/2″	20.00	X95, G105, SS95, SS105	EU	NC50	114.30	10.92	168.28	88.90	154.00	33.14
4 1/2″	20.00	S135, V150	EU	NC50	114.30	10.92	168.28	76.20	154.00	33.72
4″	14	E75, SS75	IU	NC40	101.60	8.38	133.40	71.45	127.41	22.22
4″	14	X95, SS95	IU	NC40	101.60	8.38	133.40	68.28	127.41	22.34
4″	14	G105, SS105	IU	NC40	101.60	8.38	139.70	61.93	127.41	23.14
4″	14	S135, V150	IU	NC40	101.60	8.38	139.70	50.80	127.41	23.48
4 1/2″	13.75	E75, SS75	IU	NC46	114.30	6.88	152.40	85.73	145.26	22.31
4 1/2″	16.60	E75, SS75	IEU	NC46	114.30	8.56	158.75	82.55	145.26	27.68
4 1/2″	16.60	X95, G105, SS95, SS105	IEU	NC46	114.30	8.56	158.75	76.20	145.26	27.95
4 1/2″	16.60	S135, V150	IEU	NC46	114.30	8.56	158.75	69.85	145.26	28.22
4 1/2″	20.00	E75, SS75	IEU	NC46	114.30	10.92	158.75	76.20	145.26	27.68
4 1/2″	20.00	X95, SS95	IEU	NC46	114.30	10.92	158.75	69.85	145.26	33.11
4 1/2″	20.00	G105, SS105	IEU	NC46	114.30	10.92	158.75	63.50	145.26	33.38
4 1/2″	20.00	S135, V150	IEU	NC46	114.30	10.92	158.75	57.15	145.26	33.6
5″	19.50	E75, SS75	IEU	NC50	127.00	9.19	168.28	95.25	153.99	31.79
5″	19.50	X95, SS95	IEU	NC50	127.00	9.19	168.28	88.90	153.99	32.58
5″	19.50	G105, SS105	IEU	NC50	127.00	9.19	168.28	82.55	153.99	32.95
5″	19.50	S135, V150	IEU	NC50	127.00	9.19	168.28	69.85	153.99	33.6
5″	19.50	E75, SS75	IEU	5 1/2 FH	127.00	9.19	177.80	95.25	170.66	33.22
5″	19.50	X95, G105, SS95, SS105	IEU	5 1/2 FH	127.00	9.19	177.80	95.25	170.66	33.61
5″	19.50	S135, V150	IEU	5 1/2 FH	127.00	9.19	184.15	88.90	170.66	34.89
5″	25.60	E75, SS75	IEU	NC50	127.00	12.70	168.28	88.90	153.99	40.73
5″	25.60	X95, SS95	IEU	NC50	127.00	12.70	168.28	76.20	153.99	41.8
5″	25.60	G105, SS105	IEU	NC50	127.00	12.70	168.28	69.85	153.99	42.11
5″	25.60	E75, SS75	IEU	5 1/2 FH	127.00	12.70	177.80	88.90	170.66	42.14
5″	25.60	X95, SS95	IEU	5 1/2 FH	127.00	12.70	177.80	88.90	170.66	42.51
5″	25.60	G105, SS105	IEU	5 1/2 FH	127.00	12.70	184.15	88.90	170.66	43.35
5″	25.60	S135, V150	IEU	5 1/2 FH	127.00	12.70	184.15	82.55	170.66	43.75
5″	TW 0.750	S135, V150	IEU	5 1/2 FH	127.00	19.05	184.15	82.55	170.66	57.29
5 1/2″	21.90	E75, SS75	IEU	5 1/2 FH	139.70	9.17	177.80	101.60	170.66	35.43
5 1/2″	21.90	X95, SS95	IEU	5 1/2 FH	139.70	9.17	177.80	95.25	170.66	36.36
5 1/2″	21.90	G105, SS105	IEU	5 1/2 FH	139.70	9.17	184.15	88.90	170.66	37.38
5 1/2″	21.90	S135, V150	IEU	5 1/2 FH	139.70	9.17	190.50	76.20	180.18	38.87
5 1/2″	24.70	E75, SS75	IEU	5 1/2 FH	139.70	10.54	177.80	101.60	170.66	39.54
5 1/2″	24.70	X95, G105, SS95, SS105	IEU	5 1/2 FH	139.70	10.54	184.15	88.90	170.66	41.04
5 1/2″	24.70	S135, V150	IEU	5 1/2 FH	139.70	10.54	190.50	76.20	180.18	42.52
5 1/2″	TW 0.500	S135, V150	IEU	5 1/2 FH	139.70	12.70	184.15	88.90	170.66	46.3
5 1/2″	TW 0.625	S135, V150	IEU	5 1/2 FH	139.70	15.88	184.15	79.38	170.66	54.57
5 1/2″	TW 0.750	S135, V150	IEU	5 1/2 FH	139.70	19.05	190.50	76.20	180.18	62.86
5 7/8″	23.40	E75, SS75	IEU	5 1/2 FH	149.23	9.17	177.80	101.60	170.66	37.8
5 7/8″	23.40	X95, SS95	IEU	5 1/2 FH	149.23	9.17	184.15	88.90	170.66	39.35
5 7/8″	23.40	G105, SS105	IEU	5 1/2 FH	149.23	9.17	184.15	88.90	170.66	39.35
5 7/8″	23.40	S135, V150	IEU	5 1/2 FH	149.23	9.17	184.15	76.20	170.66	40
5 7/8″	26.30	E75, SS75	IEU	5 1/2 FH	149.23	10.54	177.80	82.55	170.66	42.86
5 7/8″	26.30	X95, G105, SS95, SS105	IEU	5 1/2 FH	149.23	10.54	184.15	88.90	170.66	43.31
5 7/8″	26.30	S135, V150	IEU	5 1/2 FH	149.23	10.54	190.50	82.55	180.19	44.48
5 7/8″	TW 0.625	S135, V150	IEU	5 1/2 FH	149.23	15.88	190.50	76.20	180.19	59.72
5 7/8″	TW 0.750	S135, V150	IEU	5 1/2 FH	149.23	19.05	190.50	76.20	180.19	67.77
5 7/8″	TW 0.813	S135, V150	IEU	5 1/2 FH	149.23	20.65	190.50	76.20	180.19	72.19
6 5/8″	25.20	E75, SS75	IEU	6 5/8 FH	168.28	8.38	203.20	127.00	195.66	40.91
6 5/8″	25.20	X95, SS95	IEU	6 5/8 FH	168.28	8.38	203.20	127.00	195.66	40.91
6 5/8″	25.20	G105, SS105	IEU	6 5/8 FH	168.28	8.38	209.55	120.65	195.66	42.34
6 5/8″	25.20	S135, V150	IEU	6 5/8 FH	168.28	8.38	215.90	107.95	195.66	44.26
6 5/8″	27.70	E75, SS75	IEU	6 5/8 FH	168.28	9.19	203.20	127.00	195.66	43.63
6 5/8″	27.70	X95, G105, SS95, SS105	IEU	6 5/8 FH	168.28	9.19	209.55	120.65	195.66	45.06
6 5/8″	27.70	S135, V150	IEU	6 5/8 FH	168.28	9.19	215.90	107.95	195.66	46.97
6 5/8″	TW 0.522	S135, V150	IEU	6 5/8 FH	168.28	13.26	215.90	107.95	195.66	57.34
6 5/8″	TW 0.625	S135, V150	IEU	6 5/8 FH	168.28	15.88	215.90	107.95	195.66	67.22
6 5/8″	TW 0.750	S135, V150	IEU	6 5/8 FH	168.28	19.05	215.90	107.95	195.66	77.96
6 5/8″	TW 0.813	S135, V150	IEU	6 5/8 FH	168.28	20.65	215.90	107.95	195.66	83.16

Note on one value: the standard prints the mass of 4½″ · 20.00 · E75/SS75 · IEU as 27.68 kg/m, which is identical to the lighter 16.60 row and appears to be an erratum in the standard (its X95/G105/S,V siblings are 33.11/33.38/33.60). It is shown here as printed. Confirm against your controlled copy before use.

Source: API 5DP Annex D (SI units). Dimensions are the assembled drill pipe (tube + tool joint). "Nom. Wt" is the nominal weight designation; "TW" denotes a thick-wall variant. Symbols D_dp, t, D, d_p, D_r defined in the Reference tab. Not all size/grade/connection combinations are stocked — contact ZC to confirm.

API 5DP Tube Body Tensile Requirements — minimum and maximum yield and tensile strength, in ksi (MPa), by grade (API 5DP Table C.5)
Grade	Min Yield ksi (MPa)	Max Yield ksi (MPa)	Min Tensile ksi (MPa)	Max Tensile ksi (MPa)
E75	75 (517)	105 (724)	100 (689)	—
SS75	75 (517)	95 (655)	100 (689)	115 (793)
X95	95 (655)	125 (862)	105 (724)	—
SS95	95 (655)	110 (758)	105 (724)	130 (896)
SS105	105 (724)	120 (827)	115 (793)	140 (965)
G105	105 (724)	135 (931)	115 (793)	—
S135	135 (931)	165 (1138)	145 (1000)	—
V150	150 (1034)	170 (1172)	160 (1103)	190 (1310)

Values in ksi with MPa in parentheses. "—" = no maximum specified. Tube-body minimum elongation is a function of the tensile-specimen cross-sectional area (API 5DP Table C.7), not a single fixed value.

API 5DP Tool Joint Tensile Requirements — yield, tensile and minimum elongation, in ksi (MPa), by grade group (API 5DP Table C.5)
Grade group	Min Yield ksi (MPa)	Max Yield ksi (MPa)	Min Tensile ksi (MPa)	Max Tensile ksi (MPa)	Min Elong.
E75, X95, G105, S135, V150	120 (827)	165 (1138)	140 (965)	—	13%
SR25 (E.8) supplement	130 (896)	165 (1138)	140 (965)	—	13%
SS75, SS95, SS105 (sour)	110 (758)	125 (862)	125 (862)	145 (1000)	15%

Values in ksi with MPa in parentheses. "—" = no maximum specified. Elongation is a fixed minimum for tool joints.

API 5DP restricts only phosphorus (P) and sulfur (S). The balance of the composition is at the manufacturer's discretion to meet the mechanical requirements.

Tube Body

API 5DP Tube Body Chemistry — maximum P and S by grade group (API 5DP Table C.4)
Grade group	P max %	S max %
E75	0.03	0.02
X95, G105, S135, V150	0.02	0.015
SS75, SS95, SS105 (sour)	0.015	0.01

Tool Joint

API 5DP Tool Joint Chemistry — maximum P and S by grade group (API 5DP Table C.4)
Grade group	P max %	S max %
E75, X95, G105, S135, V150	0.02	0.015
SS75, SS95, SS105 (sour)	0.015	0.01

Drill pipe collapse rating uses the API 5C3 (Bulletin 5C3 / ISO 10400) four-regime collapse-pressure model — the same formulas that apply to casing and tubing. The governing regime is selected by the pipe's diameter-to-wall ratio D/t; the lowest of the applicable results is the rated collapse pressure. Yield strength Y_p is in psi and pressures are in psi.

Source: API Bulletin 5C3 6th edition. For the complete grade table (H40–Q125 and beyond), burst pressure and pipe-body yield, see the API 5C3 Performance Properties page →

Collapse Pressure Regimes

Formula 1 Pyp = 2 × Yp × [(D/t - 1) / (D/t)²]

Applies for thick-wall pipe. Not a true collapse pressure but the external pressure that produces minimum yield stress at the pipe inner wall (Lame equation). D/t ≤ (D/t)_YP.

Formula 3 Pp = Yp × [A / (D/t) - B] - C

Derived from statistical regression of 2488 collapse tests on K55, N80, and P110 seamless pipe. Based on 95% probability that collapse pressure exceeds minimum, with no more than 0.5% of pipe failing below minimum. Applies for (D/t)_YP ≤ D/t ≤ (D/t)_PT.

Formula 5 Pt = Yp × [F / (D/t) - G]

Arbitrary formula bridging plastic and elastic regimes. Its curve segment runs between the zero crossing of the average plastic collapse formula and the tangent with the minimum elastic collapse formula. Applies for (D/t)_PT ≤ D/t ≤ (D/t)_TE.

Formula 7 Pe = 46.95×10⁶ / [(D/t) × (D/t - 1)²]

Applies for thin-wall pipe (D/t ≥ (D/t)_TE). Based on theoretical elastic buckling theory by Clinedinst (1939), set at 75% of theoretical value to account for imperfections.

Axial-Stress (Biaxial) Correction

Formula 8 Ypa = Yp × [√(1 - 0.75 × (Sa/Yp)²) - 0.5 × (Sa/Yp)]

Modified yield strength under axial stress (Hencky-von Mises criterion). Substitute Ypa for Yp in collapse formulas. Positive Sa = tension. Not valid when axial yield strength < 24,000 psi.

Collapse Coefficients — Drill Pipe Grades

API 5C3 collapse-formula coefficients and D/t regime boundaries for the API 5DP body grades (Tables 2, 3 and 4)
Grade	Min Yield (ksi)	A	B	C	F	G	(D/t)_YP	(D/t)_PT	(D/t)_TE
E75	75	3.054	0.0642	1806	1.99	0.0418	13.6	22.91	32.05
X95	95	3.124	0.0743	2404	2.029	0.0482	12.85	21.33	28.36
G105	105	3.162	0.0794	2702	2.053	0.0515	12.57	20.7	26.89
S135	135	3.278	0.0946	3601	2.133	0.0615	11.92	19.18	23.44
V150	150	3.336	0.1021	4053	2.174	0.0666	11.67	18.57	22.11

A, B, C = plastic-collapse coefficients (Formula 3); F, G = transition-collapse coefficients (Formula 5). (D/t)_YP, (D/t)_PT, (D/t)_TE are the D/t breakpoints between the yield→plastic, plastic→transition and transition→elastic regimes. V150 maps to the API 5C3 150 ksi coefficient row.

Tool Joint Connections (RSC)

NC series (Numbered Connection): NC26, NC31, NC38, NC40, NC46, NC50

FH series (Full Hole): 4 1/2 FH, 5 FH, 5 1/2 FH, 6 5/8 FH

All are rotary shouldered connections. Thread details per API Spec 7-2.

Upset Types

EU — external upset (thickened outside only)
IU — internal upset (thickened inside only)
IEU — internal-external upset (thickened both)

Tube Body OD Tolerance (Table C.2)

API 5DP tube body outside-diameter tolerances
Location / size	Tolerance
OD (Ddp) <= 4 in	+/- 0.031 in
OD (Ddp) > 4 in	+1.0% Ddp / -0.5% Ddp
Beyond upset (M_eu): >= 2 3/8 in and <= 3 1/2 in	+0.094 in / -0.031 in
Beyond upset (M_eu): > 3 1/2 in and <= 5 in	+0.109 in / -0.75% Ddp
Beyond upset (M_eu): > 5 in and <= 6 5/8 in	+0.125 in / -0.75% Ddp

Length Ranges (Table C.3)

API 5DP drill pipe length ranges (feet)
Range	Length (ft)	Order class	Max variation (ft)	Min length (ft)
Range 1	20–23	95% of order	2	21
Range 2	29–32	90% of order	2	30
Range 3	40–45	90% of order	3	40

Charpy Impact Test Temperatures (Table C.8)

Minimum absorbed energy is specified separately for the tube body and tool joint and varies by grade, product specification level (PSL) / supplementary requirement (SR) and specimen size. Test temperatures:

API 5DP Charpy V-notch impact test temperatures by PSL / SR
PSL / SR	Test temperature
PSL-1	+70 °F ± 5 °F (approx. +21 °C)
SR19 (E.4)	+70 °F ± 5 °F
SR20 (E.5)	+14 °F ± 5 °F (approx. -10 °C)
SR24 (E.7)	+70 °F ± 5 °F
SR25 (E.8)	-4 °F ± 5 °F (approx. -20 °C)
PSL-3	-4 °F ± 5 °F

Dimension Symbols

API 5DP drill pipe dimension symbols (Figures B.1 and B.12)
Symbol	Meaning
Ddp	Drill pipe tube body outside diameter (in / mm)
t	Tube body wall thickness (in / mm), tolerance -12.5%
Dte	Drill pipe weld-neck diameter, maximum (in / mm)
D	Tool joint outside diameter (in / mm), tolerance +/-0.031 in (+/-0.79 mm)
dp	Pin bore / tool joint inside diameter (in / mm), tolerance +0.016/-0.031 in (+0.41/-0.79 mm)
Lpb	Pin (external thread) length (in / mm), tolerance +/-0.250 in (+/-6.35 mm)
Lb	Box (internal thread) length (in / mm), tolerance +/-0.250 in (+/-6.35 mm)
Dr	RSC bevel diameter (in / mm), tolerance +/-0.016 in (+/-0.41 mm)
Wdp	Approximate mass of the drill pipe assembly (lb/ft / kg/m), calculated

Frequently Asked Questions

What grades of drill pipe does API 5DP cover?