Description
Nitrile Rubber O Ring Supplier India | NBR / Buna-N | Standard & Custom Sizes | KELOR Ahmedabad
Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT
MOQ: 1000 Nos | Material: NBR / Buna-N | Hardness: 60–90 Shore A
Nitrile Rubber O Ring Supplier in India
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, supplies Nitrile Rubber O Rings (NBR O Rings / Buna-N O Rings) in standard metric and inch sizes — 70 Shore A standard hardness — -20°C to +120°C temperature range — resistant to petroleum oil, hydraulic fluid, diesel, and lubricants — black standard colour — custom sizes available as per drawing or sample. Supplied across India with GST invoice and MOQ 1000 Nos.
O rings are frequently ordered alongside valve supplies — butterfly valves, ball valves, check valves, Y strainers, and gate valves — as replacement seals, maintenance stock, or fitment components for flanged joints and valve assemblies. Krishna Industries supplies both valves and associated O rings in a single consolidated order, simplifying procurement for plant maintenance teams and EPC contractors.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | Nitrile Rubber — NBR / Buna-N (Acrylonitrile Butadiene Rubber) |
| Standard Hardness | 70 Shore A (range 60–90 Shore A available) |
| Temperature Range | -20°C to +120°C |
| Colour | Black (standard) — custom on request |
| Size Range | Standard metric (DIN 3771 / ISO 3601) and inch (AS 568) sizes |
| Custom Sizes | Available as per drawing or sample |
| Finish | Smooth moulded surface — no flash, no parting line marks |
| MOQ | 1000 Nos |
| HSN Code | 40169300 |
Media Compatibility — What NBR O Rings Resist
| Media | NBR Resistance | Suitable? |
|---|---|---|
| Petroleum oil / lubricating oil | Excellent | ✅ Yes |
| Hydraulic fluid (mineral oil based) | Excellent | ✅ Yes |
| Diesel / fuel oil | Excellent | ✅ Yes |
| Water (ambient temperature) | Good | ✅ Yes |
| Air / compressed air | Excellent | ✅ Yes |
| Dilute acids and alkalis | Moderate | ⚠️ Check concentration |
| Steam (saturated) | Poor | ❌ Use EPDM instead |
| Aromatic solvents / ketones | Poor | ❌ Use FKM/Viton instead |
| Ozone / weathering | Poor | ❌ Use EPDM instead |
For steam service: specify EPDM O rings. For aggressive chemical or solvent service: specify FKM (Viton) O rings. Krishna Industries supplies EPDM and FKM O rings on request — mention your media and temperature when placing order.
Common Use Alongside Valves
- Butterfly valve body seals — NBR seat ring replacement for CI butterfly valves in water and general utility service
- Ball valve stem seals — NBR O ring stem packing for three piece ball valves in oil and hydraulic service
- Flanged joint gaskets — NBR O ring face seal for raised face flanges in hydraulic and fuel oil lines
- Y strainer cover seals — NBR O ring for strainer cover/plug seal in oil service
- Check valve disc seals — NBR disc seat seal for wafer check valves in pump discharge lines
- Actuator seals — NBR piston and stem seals for pneumatic and hydraulic actuators
Applications
- Hydraulic systems — cylinders, pumps, control valves, accumulators — NBR is the standard seal for mineral oil hydraulic systems
- Pneumatic systems — compressed air cylinders, actuators, fittings — NBR standard for dry or lightly lubricated air
- Pump sealing — centrifugal and reciprocating pumps handling oil, fuel, or water
- Automotive and engineering workshops — engine oil seals, fuel system seals, gearbox seals
- Water treatment plants — general pipeline sealing in ambient temperature water service
- Industrial machinery maintenance — replacement O ring stock for plant maintenance departments
Ordering — Single Supplier for Valves and O Rings
Plant maintenance teams and EPC procurement departments can order Nitrile Rubber O Rings from Krishna Industries in the same order as butterfly valves, ball valves, check valves, gate valves, and Y strainers — single GST invoice, single dispatch, single point of contact. Specify size (ID × cross-section in mm, or AS 568 dash number), quantity, and hardness (default 70 Shore A if not specified). Custom sizes supplied as per drawing or sample with lead time.
WhatsApp RFQ: Send size list and quantity to +91 93135 43530 for bulk pricing within 2 hours.
GST Invoice: GSTIN 24AKLPP6499B1ZT
MOQ: 1000 Nos | Dispatch: Pan India
Frequently Asked Questions
1. What sizes are available?
Standard metric sizes per DIN 3771 / ISO 3601 and inch sizes per AS 568 are available from stock. Custom sizes — specify ID (inner diameter), CS (cross-section diameter), and hardness — are supplied as per drawing or sample.
2. What hardness is standard?
70 Shore A is the standard hardness for general industrial use. 60 Shore A (softer — better sealing on rough surfaces) and 80–90 Shore A (harder — better for high pressure and extrusion resistance) are available on request.
3. Can NBR O rings be used for steam?
No — NBR has poor resistance to steam and hot water above 80°C. For steam service, specify EPDM O rings. Krishna Industries supplies EPDM on request.
4. Can you supply alongside a valve order?
Yes — O rings, valve seats, and gaskets can be included in the same order as valves. Single consolidated GST invoice. Mention O ring requirements in your valve RFQ.
5. What is the MOQ?
MOQ is 1000 Nos. Bulk quantities welcome — pricing improves at 10000 Nos and above.
6. Do you supply FKM / Viton O rings?
Yes, on request. FKM (Viton) O rings for aromatic solvent, aggressive chemical, and high temperature service — and EPDM O rings for steam, hot water, and ozone service — are available. Specify media and temperature in your RFQ.
