SS 304 Expansion Joint & Stainless Steel 316L Exhaust Bellows Manufacturer in India

Nishra Overseas is a leading manufacturer, stockist, supplier and exporter of Stainless Steel Bellows in India, supplying SS 304 Expansion Joints and SS 316L Exhaust Bellows to industries across 50+ countries from our facility in Mumbai. Our bellows are engineered to absorb axial, lateral, and angular movement in piping systems while maintaining a leak-tight seal under high pressure and high temperature conditions.

A bellow is a flexible metallic component whose corrugated sidewalls expand and contract to compensate for thermal movement, vibration, and misalignment in a pipeline or duct. Stainless Steel Bellows are widely used to improve the efficiency of combustion and exhaust systems, absorb mechanical stress, and extend the service life of connected equipment. Because they are manufactured from stainless steel, our bellows are lightweight, corrosion-resistant, and easy to install — reducing both construction load and installation time on site.

Table of Contents

1. What is a Stainless Steel Bellow
2. Stainless Steel Bellows Specification
3. Stainless Steel Bellows Tubing Characteristics
4. Stainless Steel Exhaust Bellows Features
5. Applications of SS 304 / 316L Bellows
6. Dimensions of Stainless Steel Expansion Joint
7. Stainless Steel Bellows Manufacturer in India
8. Stainless Steel Bellows Supplier in India
9. Stainless Steel Bellows Exporter in India
10. Why Choose Nishra Overseas
11. FAQs

What is a Stainless Steel Bellow

Stainless Steel Bellows are precision-formed, corrugated tubular components used to compensate for thermal expansion, contraction, vibration, and slight misalignment in piping and ducting systems. The flexible corrugated wall expands as pressure or gas flows through it and contracts as it is released, allowing the bellow to absorb movement without transmitting stress to the rest of the system. SS Bellows Tubing is generally manufactured from 304, 304L, 316, or 316L grade stainless steel, with end connections available as flanged, welded, or threaded joints offering strong resistance to corrosion.

Stainless Steel Expansion Joints are manufactured to ensure a complete seal under the specific pressure, temperature, and environmental conditions of the application. Their anti-vibration and anti-dislocation properties, combined with excellent flexibility and displacement compensation, make them a preferred choice for engineers across India. SS Exhaust Bellows also offer a clean, precise finish, while 316L bellows add extra resistance to shock loads and high-speed operating conditions along with superior resistance to chlorides and pitting corrosion.

As a specialized manufacturer of Welded Bellows and Stainless Steel Bellows Tubing, Nishra Overseas produces bellows in multiple grades including 304, 304L, 316, 316L, 321, 347, AM350, Alloy 718, and Duplex steel to meet diverse industrial requirements.

Stainless Steel Bellows Specification

Parameter	Specification
Material	SS 304, 304L, 316, 316L, 321, 347, AM350
Thickness	0.05 mm and up, in increments of 0.025 mm
Standard Leak Rate	< 1 x 10⁻⁹ std CC He/sec
Outside Diameter	9 mm (0.358″) to 564 mm (22.2″)*
Inside Diameter	5 mm (0.198″) to 506 mm (19.9″)*
Shape	Round (standard); Non-round available on request
Length	Up to 2,440 mm (96″)
End Connections	Flanged, Welded, Threaded
Standards	ASME, ASTM, DIN, EN, EJMA

*Custom sizes manufactured on request as per customer drawing.

Stainless Steel Bellows Tubing Characteristics

• High temperature and high pressure resistance
• Excellent vibration and noise absorption
• Compact, space-saving design
• Strong resistance to abrasion
• Excellent corrosion resistance, even in chloride and marine environments
• Long fatigue life under repeated cyclic movement
• Smooth, hygienic internal surface finish

Stainless Steel Exhaust Bellows Features

• Resistance to high and very high system pressures
• Large axial, lateral, and angular movement absorption
• Compact dimensions requiring minimal installation space
• Low spring/adjusting force rates for smoother compensation
• Optimal compensation performance even in confined spaces
• Early leak indication through a standard check hole (on double-layer bellows)
• Complete burst resistance in engineered designs
• Option for continuous leak monitoring in critical or hazardous media
• Economical use of high-grade, corrosion-resistant alloys such as Inconel, Incoloy, Hastelloy, Titanium, and Tantalum for special applications
• Insulation against structure-borne noise, reducing transmitted noise by up to 20 dB

Applications of SS 304 / SS 316L Bellows

Stainless Steel Bellows manufactured by Nishra Overseas are used across a wide range of industrial and commercial applications, including:

• Gas water heaters and gas stoves
• Flow meters and volume compensators
• Vacuum chambers and vacuum systems
• Temperature and pressure sensors
• Automotive and industrial exhaust systems
• Power plant and boiler expansion joints
• Chemical and petrochemical process piping
• HVAC and ducting systems
• Pharmaceutical and food processing equipment
• Marine and shipbuilding piping systems

SS Flexible Bellows have very few leakage points and can transmit torque directly, which is why they are widely specified in gas appliances, metering equipment, and exhaust piping. SS 316L Bellows, in particular, minimize the risk of micro-leakage at welded joints, making them ideal for critical or high-purity applications, though as with any pressure component, correct sizing and installation are essential since a burst bellow can have serious consequences.

Dimensions of Stainless Steel Expansion Joint

Nominal Size (NB)	OD (mm)	ID (mm)	Wall Thickness (mm)	Standard Length (mm)
15 NB	21.3	16.0	0.15 – 0.30	100 – 300
25 NB	33.7	27.0	0.15 – 0.30	100 – 400
50 NB	60.3	52.0	0.20 – 0.40	150 – 500
100 NB	114.3	104.0	0.25 – 0.50	200 – 800
200 NB	219.1	205.0	0.30 – 0.60	300 – 1200
300 NB	323.9	305.0	0.35 – 0.70	400 – 1500

Custom dimensions, corrugation profiles, and end-connection designs are manufactured according to customer specifications and drawings. Contact our engineering team for a size chart specific to your grade and pressure class.

Stainless Steel Bellows Manufacturer in India

Nishra Overseas is recognized among the leading Stainless Steel Bellows manufacturers in India, producing SS 304 Expansion Joints, SS 316L Exhaust Bellows, and AM350 Welded Bellows from our production base in Mumbai, Maharashtra. Manufacturing directly in India allows us to offer tighter quality control, faster turnaround, and significantly lower pricing compared to imported bellows, thanks to competitive labor and raw material costs.

Every batch of bellows is manufactured under strict process control, from tube forming and hydraulic corrugation to end-fitting welding and leak testing, ensuring each bellow meets the required leak rate, burst pressure, and fatigue-life specifications. As a manufacturer — not just a trader — we can offer custom diameters, thicknesses, corrugation counts, and end configurations to suit OEM and project-specific requirements, backed by mill test certificates and ISO 9001:2015 certified processes.

Stainless Steel Bellows Supplier in India

As a trusted Stainless Steel Bellows supplier in India, Nishra Overseas maintains ready stock of SS 304, 304L, 316, and 316L Bellows Tubing in standard sizes and thicknesses, allowing us to fulfil urgent and bulk orders without production delays. We supply to EPC contractors, OEMs, fabricators, and MRO buyers across sectors including power, oil & gas, chemical processing, HVAC, and automotive exhaust manufacturing.

Buying directly from a manufacturer-supplier rather than through a stockist or trader helps our customers save on cost while ensuring full traceability of material from mill to delivery. We supply Stainless Steel Bellow Tube and SS Flexible Bellows in various thicknesses and custom designs to clients across Mumbai, and pan-India through our dealer and distribution network.

Stainless Steel Bellows Exporter in India

Nishra Overseas is an established exporter of SS 304 Bellows, SS 316L Exhaust Bellows, and AM350 Welded Bellows from India, shipping to project sites and industrial buyers in over 50 countries. Our export documentation, packing standards, and quality certification are aligned with international requirements, enabling smooth customs clearance and on-time delivery for overseas buyers.

Whether you require a single trial shipment or a long-term supply contract, our export team manages logistics, third-party inspection coordination (TPI), and documentation (COA, MTC as per EN 10204 3.1/3.2, packing list, and certificate of origin) end-to-end, so international clients receive consistent quality shipment after shipment.

Why Choose Nishra Overseas

• ISO 9001:2015 certified manufacturing and quality processes
• Manufacturer, stockist, supplier, and exporter under one roof
• Bellows available in SS 304, 304L, 316, 316L, 321, 347, AM350, Alloy 718, and Duplex grades
• Competitive pricing due to in-house manufacturing based in Mumbai, India
• Custom sizes and designs manufactured as per customer drawing
• Mill test certificates and third-party inspection support on request
• Reliable export experience to 50+ countries
• Fast response to enquiries — typically within 24 hours