Threaded Rubber Expansion Joint

The threaded rubber expansion joint, also referred to as screw-type rubber joint, BSP threaded flexible connector, or NPT rubber expansion coupling, is designed for small-diameter piping systems where flexibility, vibration absorption, and compact installation are essential. This type of joint features BSPT or NPT male/female threaded ends instead of flanges, making it ideal for HVAC, plumbing, firefighting, and industrial water or oil transmission systems.

Constructed with high-quality EPDM, NBR, or Neoprene rubber, and reinforced with nylon or steel fabric layers, the threaded rubber expansion joint offers excellent durability under low to medium pressure. It effectively compensates for pipe misalignment, thermal expansion, and slight displacement, helping to reduce system stress and extend service life.

Available in sizes from DN15 to DN80, it is widely used in tight spaces and short pipeline sections. This joint provides a reliable, leak-proof, and cost-effective solution for domestic, commercial, and industrial applications requiring threaded connections and high-performance sealing.

Key Features

• Compact threaded design for BSPT/NPT pipe connections

•Ideal for small-diameter pipes in HVAC, plumbing, and water systems

•Flexible rubber body absorbs vibration and reduces noise

•Allows for axial, lateral, and slight angular movement compensation

•Easy to install in tight or confined spaces

•Made of EPDM, NBR, or Neoprene rubber with fabric reinforcement

•Leak-free and corrosion-resistant for low to medium pressure systems

•Suitable for water, air, and light oil transmission lines

Technical Specifications

Nominal Diameter (DN)	Inch	Length (L) mm	Axial Extension mm	Lateral Displacement mm	Angular Deflection (°)

DN20

¾”

110

DN25

1″

115

DN32

1¼”

120

DN40

1½”

125

DN50

2″

130

DN65

2½”

140

DN80

3″

160

Project	Unit	TRJ-1	TRJ-2	TRJ-3

Model

–

TRJ-1

TRJ-2

TRJ-3

Working Pressure

MPa (kgf/cm²)

1.0 (10)

1.6 (16)

2.5 (25)

Burst Pressure

MPa (kgf/cm²)

2.0 (20)

3.0 (30)

4.5 (45)

Vacuum Resistance

KPa (mmHg)

53.3 (400)

86.7 (650)

100 (750)

Operating Temperature

°C

-15 ~ 115°C
(Special: -30 ~ 250°C)

Applicable Media

–

Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc.

Material	Temperature Range (°C)	Oil Resistance	Acid & Alkali Resistance	Elasticity	Abrasion Resistance	Typical Applications

EPDM

-40 ~ 120

Poor

Excellent

Medium

Water, Steam, Air

NR (Natural Rubber)

-30 ~ 80

Poor

Medium

Excellent

Industrial Water, Air

NBR

-20 ~ 100

Excellent

Medium

Good

Oil, Lubrication Systems

Neoprene

-35 ~ 100

Good

Medium

Good

Seawater, Mild Chemicals

Silicone

-60 ~ 200

Poor

Good

Low

Food Grade, Medical

FKM (Viton)

-20 ~ 250

Excellent

Medium

Excellent

Chemical, High Temp Oil

Butyl (IIR)

-40 ~ 120

Poor

Good

Excellent

Medium

Gas, Acidic Gases

Preparation:
Ensure the threaded ends of the joint and connecting pipes are clean and free of damage. Apply appropriate sealing tape or sealant.
Connection:
Hand-tighten the rubber joint onto the pipeline, ensuring threads engage properly without cross-threading.
Tightening:
Gradually tighten with a wrench to achieve a secure and leak-free connection, but avoid over-tightening to prevent damage to the joint.
Inspection:
Check alignment and tightness after installation. Perform a pressure test to confirm no leakage is present.

Regular Checks:
Inspect regularly for any sign of leakage, deformation, cracks, or corrosion on threads and rubber body.
Thread Condition:
Periodically check thread conditions. Reapply sealant or sealing tape if leakage occurs.
Replacement:
Replace immediately upon visible damage, excessive wear, or if the joint has exceeded its service life.
Protection:
Avoid direct exposure to harmful chemicals, oils, and extreme temperatures to extend the life of the rubber joint.
Cleaning:
Regularly clean threads and rubber surfaces gently using mild detergent and water to prevent corrosion and deterioration.

Why Choose Our Rubber Expansion Joints

•Proven Quality

Our products are made from high-quality rubber and steel materials, tested for durability and long-term service under harsh industrial conditions.

•Global Standards

Manufactured in compliance with DIN, ANSI, JIS standards. Compatible with global piping systems.

•Custom Solutions

Available in multiple sizes and materials (EPDM, NBR, FKM) to meet various media and working conditions.

•Factory Direct Supply

Competitive pricing with fast delivery from our own manufacturing facility.

•Trusted by Clients Worldwide

Exported to Southeast Asia, the Middle East, Europe, and other regions with excellent client satisfaction.

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