1225-Piece O-Ring Assortment Kit, 32 Metric Sizes 4–50mm, NBR Nitrile Rubber Seals for Aerospace, Hydraulic, Fuel, and Pneumatic System Maintenance
Stopping a maintenance job to source a single O-ring from a supplier is an unnecessary interruption that adds time and cost to a task that should be completable in a single session. Supplied by JHEARs Aerospace, this 1225-piece nitrile O-ring assortment covers 32 metric sizes from 4mm to 50mm, providing comprehensive bench stock of the common O-ring sizes that come up repeatedly in fuel system fitting repairs, hydraulic system maintenance, pneumatic component servicing, and general mechanical assembly work. When the right size is already in the kit, the job continues rather than waiting on a parts order.
The nitrile (NBR) rubber construction provides good resistance to petroleum-based fuels, hydraulic fluids, and oils, making this assortment suitable for the fluid system fitting and seal replacement work that forms a regular part of aviation and engineering maintenance. With 32 sizes and 1225 pieces across the kit, the assortment provides both the size range to cover most common metric fitting applications and sufficient quantity in each size to handle multiple replacements before restocking is required.
Spec: 1225-piece O-ring assortment kit. 32 metric sizes, 4mm to 50mm inner diameter range. Nitrile (NBR) rubber construction. Suitable for petroleum fuels, hydraulic fluids, and oil system fitting and seal applications. Organised multi-compartment storage case.
Who this is for: Aircraft mechanics and MRO engineers who need a comprehensive metric O-ring stock for fuel, hydraulic, and pneumatic fitting repairs and seal replacements, flight schools maintaining a well-stocked maintenance bench with the common seal sizes needed for training fleet servicing, and any engineering workshop where metric O-ring availability across a range of sizes is a routine maintenance requirement.
FAQ
Are nitrile (NBR) O-rings suitable for use with aviation fuel and hydraulic fluids?
Nitrile rubber O-rings have good compatibility with petroleum-based fuels (AVGAS, Jet-A), mineral hydraulic fluids, and oils, making them suitable for many aviation fuel system and hydraulic fitting applications. They are not compatible with synthetic hydraulic fluids such as Skydrol or with oxygen system applications, which require specific elastomer types. Always verify O-ring material compatibility with the specific fluid and system in your aircraft maintenance manual before installation.
How are the 32 sizes organised in the kit?
The kit is supplied in a multi-compartment storage case with sizes separated by compartment for easy identification and selection. Each compartment is labelled with the corresponding O-ring size, allowing the correct replacement to be found quickly without sorting through a mixed collection.
Does this kit cover AS568 standard sizes as well as metric sizes?
This kit covers 32 metric sizes in the 4–50mm range. AS568 is an imperial standard used widely in US-type aircraft fittings and may not be directly interchangeable with metric sizes even where the dimensions appear close. For aircraft with US-standard hydraulic and fuel fittings, verify whether metric or AS568 imperial O-ring sizes are specified in your maintenance documentation before selecting a replacement from this kit.
Why should I purchase my O-ring assortments from JHEARs Aerospace?
At JHEARs Aerospace, we supply practical maintenance consumables including seal and O-ring assortments selected for use in aviation and engineering maintenance environments. Having the right O-ring size on the bench when it is needed keeps maintenance tasks moving and avoids the cost and delay of single-item parts sourcing for routine seal replacements.
