O-ring NBR 25x3 mm

Applications & Compatibility | Material Advantages | Technical Specifications & Usage Tips

The O-Ring 25x3 NBR 70 ShA is a versatile nitrile rubber sealing ring with an inner diameter of 25 mm and cross-section or thickness of 3 mm. Manufactured from NBR (nitrile rubber) at a hardness of 70 Shore A, it offers excellent balance between flexibility and durability, especially in oil, grease, and many hydraulic fluid environments.

This listing is offered in a bulk pack of 1000 pieces, an optimal solution for B2B users such as maintenance departments, machine builders, and industrial service providers who require consistent, high-volume stock.

In English-language searches, typical queries include:

• “O-ring 25x3 NBR 70”

• “nitrile O-ring 25x3 mm”

• “O-ring 25x3 pack of 1000”

• “OR-25X3-NBR70 O-ring”

• “O-ring NBR 70 25x3 bulk”

This description integrates these key phrases (e.g. O-ring 25x3 NBR70, nitrile O-ring 25x3, O-ring pack of 1000) and related synonyms (e.g. sealing ring, rubber gasket) to boost SEO relevance.

Applications & Compatibility

• Used in hydraulic systems, pneumatic equipment, valves, pumps, and cylinders as static or dynamic seals

• Common in automotive and machinery seals where compact O-rings like 25x3 are needed

• Also useful in instrumentation, small engines, fluid connectors, and general mechanical assemblies

• Bulk quantity (1000 pc) suits production lines, preventive maintenance, and OEM supply

Because of the 70 ShA hardness, the ring retains sufficient resilience to form sealing under moderate compression while resisting deformation over time. Additionally, the nitrile compound resists oils, greases, petroleum, and many lubricants (typical in NBR’s compatibility range).

Material Advantages & Durability

• NBR 70 delivers a strong combination of elastic recovery, chemical resistance, and mechanical strength

• Suitable for operating temperatures typically between - 30 °C and + 100 °C (some sources note up to + 135 °C under ideal conditions)

• Efficient sealing performance under moderate pressure differentials

• Bulk packaging allows for cost-effective replenishment and reduces downtime from shortages

Technical Specifications & Usage Tips

Usage Tips:

• Select correct gland dimensions to ensure proper squeeze (e.g. ~10-30% compression depending on design)

• Insert O-ring carefully to avoid twisting or nicking

• Use lubricant (compatible grease) during installation to reduce friction and wear

• Periodically check for hardening or degradation in harsh environments

• Store bulk rings in cool, dry environment away from direct sunlight to prolong shelf life

📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
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This bulk offering is distinct from any small-pack version on simmering.pl, helping to avoid internal cannibalization while attracting industrial buyers.

FAQ (Frequently Asked Questions)

Q: What does “25x3 NBR 70” mean?
A: It denotes an O-ring with an inner diameter of 25 mm, a cross-section (thickness) of 3 mm, made of nitrile rubber (NBR) with hardness 70 Shore A.

Q: Is this ring compatible with oils and greases?
A: Yes — NBR (nitrile rubber) is widely used for seals in oil, fuel, and lubricant environments, offering good resistance for typical industrial use.

Q: Why buy a pack of 1000?
A: Bulk purchase ensures supply continuity, cost efficiency, and readiness for maintenance or production demands without frequent reorders.

Q: What is the working temperature range?
A: Usually around - 30 °C to + 100 °C, with some tolerance toward + 135 °C under optimal conditions.

Q: Can this O-ring be used in dynamic sealing (e.g. pistons)?
A: It can serve in light dynamic or reciprocating applications, but for high-speed dynamic sealing specialized elastomers (like FKM) may be preferred.