S135 API 5DP Drill Pipe | API Spec 5DP S135 Ultra‑High Strength Drill Pipe

API Spec 5DP highest‑strength grade for ultra‑deep high‑torque well operation
Inertia friction welded heavy‑duty upset tool joint for extreme torsion load
NC26‑NC40 full thread options, industry‑standard R2 length 9.14 meter
Ultra‑high yield & tensile strength, bear extreme heavy‑load underground drilling
100% NDT inspection for pipe body & welding seam, complete mill documentation

Product Overview

API 5DP S135 drill pipe is ultra‑high‑strength grade drill pipe for ultra‑deep oil‑gas well drilling. Manufactured according to API Spec 5DP standard, inertia friction welding connects pipe body and heavy‑duty upset thickened tool joint, to sustain extreme high torque, heavy tensile load in ultra‑deep underground drilling environment.

S135 is top strength grade within API 5DP drill pipe series, applied for ultra‑deep oil‑gas well, high‑torque mining drilling and heavy‑load geological exploration. Equipped with NC26, NC31, NC38, NC40 thread connections, standard R2 length 9.14m.

Each S135 drill pipe receives strict dimensional inspection, thread precision check, mechanical performance test and full non‑destructive testing. Mill test certificate will be provided for every batch, third‑party inspection is supported.

Drill Pipe

Chemical & Mechanical Property Snapshot

Grade	C (%)	Mn (%)	P (%) Max	S (%) Max	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HRC)
S135	0.30‑0.35	1.35‑1.65	0.020	0.015	931‑1069	≥1000	≥15	≤32

Detailed Technical Specifications

Item	Details
Product Name	S135 API 5DP Drill Pipe
Applicable Standards	API Spec 5DP
Material Grade	S135
Common Outer Diameter	2‑3/8″, 2‑7/8″, 3‑1/2″, 4″, 4‑1/2″
Standard Length	R2:9.14 m
Tool Joint Type	Upset thickened tool joint
Welding Method	Inertia friction welding
Thread Connection	NC26, NC31, NC38, NC40
Connection Performance	Ultra‑high torque & tensile resistance, extreme heavy‑load
Application Scenario	Ultra‑deep wells, high‑pressure high‑torque mining drilling
Inspection Process	Dimensional measurement, thread inspection, mechanical property testing, NDT
Certification Document	Mill Test Certificate supplied for each batch
Thread Protection	Protective caps installed on both ends
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	7‑15 working days after receiving deposit
Package	Waterproof paper + galvanized steel strap + seaworthy export wooden pallet

Dimension Table

Nominal Size (inch)	OD (mm)	Wall Thickness (mm)	ID (mm)	Unit Weight (kg/m)	Thread Type	Standard Length Range
2-3/8″	60.33	4.83	50.67	16.02	NC26 / NC31	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
2-7/8″	73.03	5.51	62.01	23.29	NC31 / NC38	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
3-1/2″	88.90	5.49	77.92	29.76	NC38 / NC40	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4″	101.60	6.65	88.30	38.23	NC44	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4-1/2″	114.30	6.88	100.54	44.50	NC46 / NC50	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5″	127.00	7.52	111.96	53.41	NC50 / NC56	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5-1/2″	139.70	7.72	124.26	61.70	NC56 / NC61	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
6-5/8″	168.28	8.38	151.52	81.58	NC70	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m

Product Comparison Table

Product	Main Function	Material / Standard	Key Characteristics	Typical Applications
G105 Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	API Spec 5DP, G105	High torque & tensile performance, fatigue‑resistant	Deep oil‑gas wells, coal‑bed methane drilling
S135 Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	API Spec 5DP, S135	Ultra‑high strength, heavy torque, high load capacity	Ultra‑deep wells, high‑pressure high‑torque mining drilling
4145H Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	SY/T 5290,4145H alloy steel	Excellent abrasion and impact resistance	Heavy‑duty mine drilling, rock bolt anchoring projects

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Drilling for Oil and Gas Exploration

Water Well Drilling

Drilling for Geological Exploration

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is S135 drill pipe used for?

It is designed for ultra‑deep oil‑gas well, high‑torque heavy‑load mining drilling projects.

Can S135 drill pipe replace G105 directly?

S135 has higher strength, but higher cost; select grade depends on actual drilling depth and torque load.

What is hardness range for S135 grade?

Max HRC ≤32 per API Spec 5DP requirement.

What inspection you perform for S135 drill pipe?

Dimension, thread inspection, mechanical test and full‑body NDT.

What thread sizes available?

NC26, NC31, NC38, NC40 standard threads.

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S135 API 5DP Drill Pipe | API Spec 5DP S135 Ultra‑High Strength Drill Pipe