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Threaded Rods & Studs › Fully Threaded Rods & Studs

Replacement Rod String Coupling for Oilfield Pumping Units with Factory Threaded Rod Coupling and Oilfield Machined Rod Connector Ends

Updated 2026-11-04 · Markdown version

Model no. Customized

US$1.20 – 12.00 / piece

MOQ 100 pieces · Final price confirmed in your quote

Surface Treatment: Black / Plain
Material: AISI 4140 / 5140 Alloy Steel.etc
Standard: Customized
Class SM (Surface-Hardened): Features a spray-metal coating with surface hardness ≥595 HV200 and a coating thickness of 0.254–0.508 mm.
Full-Size Couplings: Offer maximum connection strength with a cross-sectional area 2.6–3.4 times that of the corresponding rod body.

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Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order.

Specifications

Surface Treatment	Black / Plain
Applicable Medium	Complex Media, Petroleum & Chemicals, General Fluids
After-sales Service	Avaliable
Model NO.	Customized
Warranty	1 Year
Flexible or Rigid	Rigid
Material	AISI 4140 / 5140 Alloy Steel.etc
Standard	Customized
Product Name	Sucker Rod Coupling
Key Characteristics	High Connection Strength, Fatigue Resistance,
Key Characteristics2	Wear Resistance, Anti-Galling
Connection with	Sucker Rods, Polished Rods, Sinker Bars
Customization	Size, Class, Coating, Marking, Packaging.etc
Transport Package	Wooden Cases
Specification	Customized
Origin	China
Class T (Through-Hardened)	Ideal for general well conditions. Phosphate or black oxide coating available upon request for enhanced corrosion resistance.
Class SM (Surface-Hardened)	Features a spray-metal coating with surface hardness ≥595 HV200 and a coating thickness of 0.254–0.508 mm.
Full-Size Couplings	Offer maximum connection strength with a cross-sectional area 2.6–3.4 times that of the corresponding rod body.
Slim-Hole Couplings	Enable operators to run one-size-smaller tubing — e.g., 1-inch rods in 2-7/8-inch tubing and 7/8-inch rods in 2-3/8-inch tubing.
Delivery Terms	FOB, CIF, EXW and Express Delivery
Accepted Currencies	USD, EUR, and CNY
Payment Methods	T/T, L/C and others.
Category	Fully Threaded Rods & Studs

Technical parameters

Product Name	Sucker Rod Coupling
Product Category	Oilfield sucker rod connection equipment
Available Types	Full-size, slim-hole, reducing, polished rod coupling
Material	AISI 4140 / 5140 alloy steel.etc
Material Grades	Class T (through-hardened); Class SM (surface-hardened)
Manufacturing Standard	Spec , RP R
Nominal Size Range	5/8 in. to 1-1/8 in.
Thread Type	Standard thread, cold-rolled
Surface Treatment	Phosphate / Black oxide; Spray-metal coating
Key Characteristics	High connection strength, fatigue resistance, wear resistance, anti-galling
Performance Highlights	Reliable under high-load, abrasive, and deviated well conditions
Connection	Sucker rods, Polished rods
Applications	Beam pumping, PCP, slim-hole completions, deviated wells
Product Advantages	Stronger than rod body; slim-hole design allows one-size-smaller tubing
Customization	Size, class, coating, marking, packaging
Packaging	Wooden case, pallet, Moisture Protection and Customization, Export-standard packing
MOQ	Negotiable

Description

Replacement Rod String Coupling for Oilfield Pumping Units with Factory Threaded Rod Coupling and Oilfield Machined Rod Connector Ends is part of our fully threaded rods & studs range (Threaded Rods & Studs).

Key details

Standard: Customized
Material: AISI 4140 / 5140 Alloy Steel.etc
Surface Treatment: Black / Plain
Applicable Medium: Complex Media, Petroleum & Chemicals, General Fluids
Warranty: 1 Year
Flexible or Rigid: Rigid
Product Name: Sucker Rod Coupling
Key Characteristics: High Connection Strength, Fatigue Resistance,

Available configurations include surface treatment, material, standard, class sm (surface-hardened) and full-size couplings. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request.

Ordering through Engineering Hardware & Fasteners

Minimum order is 100 pieces at US$1.20 – 12.00 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you.

Frequently asked questions

What is the minimum order quantity (MOQ) for Replacement Rod String Coupling for Oilfield Pumping Units with Factory Threaded Rod Coupling and Oilfield Machined Rod Connector Ends?

The listed minimum order is 100 pieces, at US$1.20 – 12.00 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size.

What are the main specifications of Replacement Rod String Coupling for Oilfield Pumping Units with Factory Threaded Rod Coupling and Oilfield Machined Rod Connector Ends?

Standard: Customized; Material: AISI 4140 / 5140 Alloy Steel.etc; Surface Treatment: Black / Plain; Applicable Medium: Complex Media, Petroleum & Chemicals, General Fluids; Warranty: 1 Year; Flexible or Rigid: Rigid. The full specification table and any technical parameter tables are listed on this page.

Can this product be customized (OEM)?

Listed configurations include surface treatment, material, standard, class sm (surface-hardened) and full-size couplings. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing.

What is the lead time and how is it shipped?

Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment.

Which other fully threaded rods & studs are available?

The Fully Threaded Rods & Studs category lists 1,054 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/threaded-rods-studs/fully-threaded-rods-studs/

How we work

Specified, checked and shipped by Engineering Hardware & Fasteners

Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing.

DIN, ISO, ASTM, ANSI, JIS and GB standard parts
Non-standard parts made to your drawing
Dimensions, thread gauges and plating checked before packing
Export cartons and pallets, consolidated mixed orders
Samples available for approval before mass production

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US$1.20 – 12.00MOQ 100 piecesGet a quote WA