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API 5CT Pup Joint - Short Length Threaded Steel Tube for Casing/Tubing String Length Adjustment

Casing Pup Joint - short connector for casing string length adjustment and wellhead spacing

API pup joint length options - 2ft to 20ft custom lengths with standard API threading for casing/tubing

Tubing Pup Joint - short production string component for downhole tool spacing and depth adjustments

Pup Joint with LTC connection - standard long thread coupling for oil well casing service

Pup Joint

Keywords（pipe type）: Pup Joints, Casing Pup Joints, Tubing Pup Joints, Perforated Pup Joints
Standards: API 5CT and 5B J55,K55,N80-1,N80-Q,P110, C95
Sizes: Tubing Coupling: 2-3/8'' - 4-1/2'' Casing Coupling: 4-1/2'' - 20' Length: 2, 3, 4, 6, 8, 10, 12 ft
Specification Range: 2-3/8INCH to 20INCH
Materials: J55, K55, N80, L80, C90,T95, P110 and Q125
T&C: EUE, NUE, STC, LTC, BTC, and Premium connection
Type: PIN*PIN, PIN*BOX
Testing: NDT Etc Related Rules of API 5CT and 5B
Packing: By Bundles, Seaworthy Packing
Application: Connecting Two Oil Tubing or Casing Pipes


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Pup Joints

Pup joints are used to adjust the height of tubing or casing strings or the depth of down-hole tools, and these pup joints are made of seamless steel pipes. Pup joint can be available with tubing pup joint or casing pup joint, and material for pup joint can be avalialbe in J55, K55, N80, L80 or P110, sizes of tubing pup joint range from 2⅜¡± to 4½¡±, and casing pup joint range from 4½¡± to 13⅜¡±, thread of pup joint can be 8RD, 10RD or BTC, length of tubing pup joint are often offered in 2ft, 3ft, 4ft, 6ft, 8ft, 10ft and 12ft, length of pup joint for special purpose can be available as per order. Pup joints are machined with an interchangeable Pin & Box thread on two ends or another configuration, one end is equipped with a coupling, and the other end is protected with a closed-end thread protector. Nominal weight of tubing pup joint is the same as tubing, and casing pup joint is the same as casing.

Tubing pup Joint

Tubing pup joints are designed and manufactured as per API 5CT to be used to adjust the height of tubings, and tubing pup joints are made of seamless steel tubings. Material grade of tubing pup joint can be available in J55, K55, N80, L80, or P110, sizes of tubing pup joint range from 2⅜¡± to 4½¡±, thread of pup joint can be 8RD, 10RD, or BTC, and end connection types can be NUE and EUE. The length of tubing pup joint is often offered in 2ft, 3ft, 4ft, 6ft, 8ft, 10ft, and 12ft. Length of pup joints for special purposes can be available as per order. Tubing pup joints are machined with interchangeable Pin & Box thread on two ends or another configuration, one end is equipped with a coupling, and the other end is protected with a closed-end thread protector. Nominal weight of the tubing pup joint is the same as the tubing. Tubing pup joints are internally and externally hydrostatically tested with tension and compression loads, and torque tested, electromagnetically inspected, the pup joint is full-body drift and straightness visually inspected, and phosphated and dye-penetrant inspected. and finally painted by machine to ensure an excellent appearance. Finished tubing pup joints are often packed by steel belts in bundles, and then fixed in a steel rack for easy transportation.

Casing the pup joint

Casing pup joints are designed and manufactured as per API 5CT to adjust the height of casings, and casing pup joints are made of seamless steel casings. Material grade of casing pup joint can be avalialbe in J55, K55, N80, L80 or P110, sizes of casing pup joint range from 4½¡± to 13⅜¡±, thread of pup joint can be 8RD, 10RD or BTC, length of tubing pup joint are often offered in 2ft, 3ft, 4ft, 6ft, 8ft, 10ft and 12ft, length of pup joint for special purpose can be available as per order. Casing pup joints are machined with an interchangeable Pin & Box thread on two ends or another configuration, one end is equipped with a coupling, and the other end is protected with a closed-end thread protector. Nominal weight of casing pup joint is the same as casing. Casing pup joints are internally and externally hydrostatically tested with tension and compression loads, and torque tested, electromagnetically inspected, the pup joint is full-body drift and straightness visually inspected, and phosphated and dye-penetrant inspected. and finally painted by machine to ensure an excellent appearance. Finished casing pup joints are often packed by steel belts in bundles, and then fixed in a steel rack for easy transportation.

Features

Transportation or piping systems that carry fluids, slurries, or gases under pressure or vacuum at varying temperatures.

Reduction of vibration.

Dampen sound transmission.

Compensate for movements due to thermal changes, misalignments caused by wear, load stresses, and settling of supporting foundations.

Molding production with a long radius arch.

Standard measures (length).

Advantages

Easy installation, flanges can be rotated.

For installation with “torsional misalignments”.

Flanges are not in contact with the medium, which enables lower-grade material.

Galvanic surfaces/ coatings are possible.

Gaskets can be eliminated.

Additional movement capabilities.

Self cleaning arch (no need filler material).

Economic.

Q: What is a pup joint, and what are its primary applications?

A: A pup joint is a short section of pipe used as an interconnecting component in oil and gas operations. Its primary function is to adjust the overall height of full-length tubing or casing strings, as well as to precisely adjust the depth of downhole tools. Additionally, pup joints are widely used as transition pieces in high-pressure flowlines, frac operations, and wellhead assemblies.

Q: What materials and steel grades do you offer for your pup joints?

A: We manufacture pup joints using premium materials to ensure high strength and durability. For oil country tubular applications, we supply seamless pup joints in API 5CT grades such as J55, K55, L80, N80, and P110. For drill stem components, we use high-strength AISI-4145H alloy steel. We also offer specialized options for sour gas (H2S) service environments.

Q: Do you manufacture pup joints for high-pressure frac operations?

A: Yes, we supply ultra-high-pressure flowline pup joints specifically designed for demanding shale and frac applications. These heavy-duty pup joints can withstand extreme pressures (up to 20,000 psi) and are built to handle extended duty cycles. They are available with specialized end connections to integrate seamlessly with your existing frac iron and flowline equipment.

Q: What is the Minimum Order Quantity (MOQ), and do you offer custom manufacturing?

A: We are highly flexible with our MOQ, which can be as low as 10 pieces for standard specifications. We fully support OEM and custom manufacturing services. Whether you require specific overall lengths, left or right-hand threads, custom shoulder types, or specialized surface treatments and coatings, our engineering team can tailor the product to your exact project requirements.

Q: How do you ensure the quality and traceability of your pup joints?
A: Quality and safety are our top priorities. Every pup joint is serialized with a distinctive heat number, ensuring full material traceability. Our manufacturing involves rigorous quality control, including ASME IX and BS EN 287-1 qualified welding, and ASNT/CSWIP approved inspections. We also welcome clients to appoint third-party inspection agencies (such as SGS or BV) to verify dimensions, mechanical properties, and overall quality before delivery.

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API 5CT casing size chart - OD from 4-1/2" to 20", wall thickness, and nominal weight per foot for J55 to P110 grades

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SPECIFICATIONS
TUBING PUP JOINT	OD	GRADE	END TYPE	LENGTH(FT)
	2 3/8″	J/K/L/N/P	NUE/EUE	2/3/4/5/6/8/10/12
	2 7/8″	J/K/L/N/P	NUE/EUE	2/3/4/5/6/8/10/12
	3 1/2″	J/K/L/N/P	NUE/EUE	2/3/4/5/6/8/10/12
	4 1/2″	J/K/L/N/P	NUE/EUE	2/3/4/5/6/8/10/12

CASING PUP JOINT	OD	GRADE	END TYPE
	4 1/2″	J/K/L/N/P	LTC/STC/BTC
	5″	J/K/L/N/P	LTC/STC/BTC
	5 1/2″	J/K/L/N/P	LTC/STC/BTC
	6 5/8″	J/K/L/N/P	LTC/STC/BTC
	7″	J/K/L/N/P	LTC/STC/BTC
	7 5/8″	J/K/L/N/P	LTC/STC/BTC
	7 3/4″	J/K/L/N/P	LTC/STC/BTC
	8 5/8″	J/K/L/N/P	LTC/STC/BTC
	9 5/8″	J/K/L/N/P	LTC/STC/BTC
	10 3/4″	J/K/L/N/P	STC/BTC
	11 3/4″	J/K/L/N/P	STC/BTC
	13 3/8″	J/K/L/N/P	STC/BTC

Size / Thread	Weight*	Grades	Length	Surface treatment	Coupling
2 3/8″ EUE	4.7	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
2 7/8″ EUE	6.5	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
3 1/2″ EUE	9.3	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
4 1/2″ EUE	12.75	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
2 3/8″ NUE	4.6	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
2 7/8″ NUE	6.4	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
3 1/2″ NUE	9.2	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S
4 1/2″ NUE	12.6	J55 / L80/P110	R1/R2/R3	painting	C/W/N/S

Standard	Steel Grade	Yield Strength (MPA)		Tensile Strength (MPA)	Elongation
Standard	Steel Grade	min	max	min	Elongation
API 5CT	J55	379	552	517	0.5
API 5CT	N80	552	758	689	0.5

Grade	Yield Strength				Tensile Strength
	Min		Max		Min
	Psi	MPA	Psi	MPA	Psi	MPA
J55	55000	379	80000	552	75000	517
K55	55000	379	80000	552	95000	655
N80	80000	552	110000	758	100000	689
L80	80000	552	95000	655	95000	655
P110	110000	758	140000	965	125000	862

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