# O-ring 250x2.5 mm NBR 70 · 21A7 · 5331-14-246-5384

Source: https://oringaero.fr/en/produits/21a7-250x2-5.html

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1. O-ring2. Drawing[Open the PDF drawing ↗](https://oringaero.fr/plans/Plan_21a7-250x2-5_250x2.5_21A7.pdf)O-RING · NBR

# O-ring 250 × 2.5 mm · NBR 70 · 21A7

O-ring with an inside diameter of 250 mm and a cross-section of 2.5 mm (250x2.5), in NBR 70 Shore A to NF L 17-121 (material code 21A7). Nominal outside diameter 255 mm, weight 4.751 g. Reference 5331-14-246-5384.

Oringaero reference | OA-21A7-250X2.5 | 

Material code | [21A7 — NBR](https://oringaero.fr/en/matieres/21A7.html) | 

Material standard | NF L 17-121 | 

Hardness | 70 Shore A | 

Inside Ø | 250 ± 1.40 mm | 

Cross-section | 2.5 ± 0.08 mm | 

Nominal outside Ø | 255 mm | 

Colour | Black | 

Weight | 4.751 g | 

Continuous temperature¹ | −20 to +120 °C | 

Short-term temperature¹ | −20 to +140 °C | 

Tolerances | ISO 3601-1:2012 — class A, annex A | 

Surface imperfections | ISO 3601-3:2005 + Amd 1:2018 — grade N | 

Reference | **5331-14-246-5384** | 

¹ Service temperatures to NF L 17-121; the short-term temperature applies to brief exposure.

QuantityAdd to my request
- Manufacturer: JUNGA Ltd, EN 9100 certified

- Lead time: 2 to 4 weeks depending on quantity

- Packaging: individual bags, labelled to NF L

- Price: on quotation; state the conformity documents you need

## Application and inspection

Petroleum fuels and some diester lubricants.

Values measured at qualification of compound 21A7: tensile strength 20.4 MPa, elongation at break 366 %, compression set 20.5 % (70 h at 125 °C), density 1.22 g/cm³.

[Tolerances, surface imperfections and storage →](https://oringaero.fr/en/normes.html)

## Explore this material

[Properties and temperatures: 21A7](https://oringaero.fr/en/matieres/21A7.html)
[Browse all dimensions](https://oringaero.fr/en/catalogue/21a7-1.html)
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Adjacent catalogue sizes are not interchangeable; confirm dimensions and suitability.