O-Ring Kits & Assortments
AS568, metric, and material-specific O-ring kits for maintenance shops, field service, and OEM assembly lines — the right o ring kit reduces downtime and eliminates emergency procurement.
Overview
An O-ring kit is one of the most cost-effective ways to reduce equipment downtime. A single unplanned shutdown typically costs more than an entire year's kit inventory — having the right seal on the shelf eliminates the wait. Whether you need a standard AS568 assortment for general hydraulic maintenance, a metric ISO 3601 kit for European equipment, or a material-specific set for chemical or food processing, we supply kits that are organised, labelled, and ready for the shop floor. Choose a standard o ring kit when your equipment follows common AS568 or metric sizes and uses mineral oil, water or general industrial fluids. Choose a custom kit when your fleet uses a known subset of sizes, requires mixed materials such as NBR, FKM and EPDM, or must carry compound-specific certificates for FDA, NSF/ANSI 61 or aerospace specifications. Material-specific kits keep NBR, FKM and EPDM compartments separate so technicians cannot install the wrong compound in oil, chemical or water service. We offer both off-the-shelf standard kits and custom assortments built to your BOM. Custom kits can include multiple materials, special sizes, your own part numbers on the compartment labels, and compound-specific certificates of conformance for regulated applications. MOQ for standard kits: 1 set. MOQ for custom kits: 10–50 sets depending on configuration. Lead time: 5–10 business days for standard; 2–3 weeks for custom.
Kit Types
AS568 Assortment Kits
The industry standard for North American and global industrial maintenance. Typically includes 30–40 popular dash sizes in NBR 70 Shore A, organised in a rugged plastic case. Covers the O-ring sizes used in the majority of hydraulic cylinders, pneumatic systems, and pumps manufactured to AS568 dimensional standards. Use the size chart hub hub to confirm dash numbers and the O-ring kit selection guide for kit-selection methodology.
Coverage: Common coverage: -006 to -050, -110 to -178, -210 to -284
Metric O-Ring Kits
Sized to ISO 3601 and DIN 3771 dimensions. Essential for machinery imported from Europe or Asia where AS568 sizes do not match. Metric kits are increasingly specified by global OEMs standardising on ISO 3601 Grade N tolerances.
Coverage: Common coverage: 3×1.5 through 50×5 in standard metric increments
Material-Specific Kits
Kits compiled entirely from one material for applications where fluid compatibility is critical. Available in NBR (petroleum service), FKM (high temperature and aggressive chemicals), EPDM (water and steam), and VMQ (food and low-temperature). All compounds ISO 9001 certified; FDA-grade options available for FKM, EPDM, and VMQ.
Coverage: AS568 or metric sizes in the material of your choice
Custom Kits
Built to your exact requirements. Include only the sizes and materials you use, with custom labelling, packaging, and documentation. Eliminates obsolete inventory from standard assortments—companies using custom kits typically reduce seal spend 20–30% versus buying standard assortments.
Coverage: Any combination of sizes, materials, and quantities
Kits by Application
Pre-configured assortments matched to common maintenance scenarios. Each links to the application guide for material and sizing detail.
Hydraulic Cylinders
Hydraulic Maintenance Kit
382 pieces, 30 AS568 sizes, NBR 70 Shore A
Materials: NBR 70 Shore A
Automotive O-Rings
Automotive Multi-System Kit
NBR/HNBR for oil and fuel, EPDM for coolant — metric and AS568 sizes
Materials: NBR, HNBR, FKM, EPDM
Pool & Spa
Pool & Spa EPDM Kit
Metric 12×2 through 60×3 mm for pumps, filters and chlorinators
Materials: EPDM 70 Shore A
Pressure Washers
Pressure Washer Service Kit
NBR 90 Shore A pump seals plus EPDM hose fittings
Materials: NBR 90 Shore A, EPDM
Tri-Clamp & Sanitary
Food & Beverage Kit
270 pieces, 30 AS568 sizes, FDA VMQ and EPDM
Materials: FDA VMQ, EPDM
Fuel Injectors
High-Temperature Kit (FKM)
205 pieces, 24 AS568 sizes, FKM 75 Shore A for direct injection
Materials: FKM 75 Shore A
Faucet & Plumbing
Food & Beverage Kit (EPDM/VMQ)
270 pieces, NSF-61 EPDM and FDA VMQ for potable water repairs
Materials: FDA VMQ, EPDM
Water Filter
Food & Beverage Kit (EPDM/VMQ)
NSF-61 EPDM for filter housings, RO vessels and UV unions
Materials: EPDM 70 Shore A
Propane & Gas
Automotive Multi-System Kit
NBR and HNBR metric sizes for tank valves, regulators and appliances
Materials: NBR, HNBR
Garden Hose
Pool & Spa EPDM Kit
Metric 12×2 through 60×3 mm for hose quick-connects and outdoor seals
Materials: EPDM 70 Shore A
Consumer & Appliance
Consumer & Appliance Kit
VMQ, EPDM and NBR — cookers, drinkware, CO₂, kegs and home appliances
Materials: FDA VMQ, EPDM, NBR
Popular Configurations
| Kit Name | Contents |
|---|---|
| Hydraulic Maintenance Kit | 382 pieces, 30 AS568 sizes, NBR 70 Shore A, black |
| High-Temperature Kit | 205 pieces, 24 AS568 sizes, FKM 75 Shore A, brown |
| Food & Beverage Kit | 270 pieces, 30 AS568 sizes, FDA VMQ and EPDM, translucent/white |
| Metric Service Kit | 407 pieces, 32 ISO 3601 sizes, NBR 70 Shore A, black |
| Pool & Spa EPDM Kit | EPDM 70 Shore A, metric 12×2 through 60×3 mm — pump lids, filter valves, chlorinators |
| Pressure Washer Service Kit | NBR 90 Shore A pump head seals plus EPDM hose fittings — commercial unit sizes |
| Consumer & Appliance Kit | FDA VMQ, NSF EPDM and NBR 90A — metric 6×1.5 through 19×2.5 mm for cookers, bottles, CO₂ and home appliances |
Packaging Options
Compartment Cases
Durable plastic cases with hinged lids and individual compartments. Size labels are printed, not stickers, to resist oil and solvent exposure in workshop environments.
Re-Sealable Bags
Each size is packed in a zip-seal polyethylene bag with printed size, material, durometer, and lot number for traceability.
Custom Labelling
Add your company logo, internal part numbers, barcodes, QR codes, or colour-coded material identifiers. Supports direct integration with CMMS and ERP systems.
Frequently Asked Questions
What is an o ring kit?
An o ring kit is an organised assortment of O-rings in multiple sizes and often multiple materials, supplied in a compartment case or bag set. It lets maintenance teams replace failed seals immediately instead of waiting for procurement. Common formats include AS568 assortments, metric ISO 3601 sets and material-specific kits in NBR, FKM or EPDM.
What is an AS568 o ring kit?
An AS568 o ring kit contains popular inch-based dash-number sizes per the AS568 standard. It is the most common kit format for North American hydraulic, pneumatic and pump maintenance. See the AS568 size standard for the full dash-number table.
Which applications are O-ring kits used for?
O-ring kits are used wherever preventive maintenance covers many seal sizes. Common examples include pressure washer service, automotive O-ring repairs and general stock for rubber o ring replacement across mixed equipment fleets.
What is the most popular O-ring kit?
The 382-piece NBR AS568 assortment is the most widely used kit for general hydraulic and pneumatic maintenance. It covers 30 of the most commonly specified AS568 dash sizes in NBR 70 Shore A—the standard compound for petroleum oil, pneumatic air, and general industrial service. This single kit handles the majority of maintenance needs on hydraulic cylinders, pneumatic actuators, and pump systems made to North American dimensions.
Can I order a kit with multiple materials?
Yes. We build mixed-material kits—for example, NBR for oil service, EPDM for water, and FKM for high-temperature zones—all in one organised case with colour-coded compartments or material-labelled bags. Mixed-material kits are popular for maintenance shops servicing diverse equipment where a single-material assortment leaves gaps.
Do you offer metric O-ring kits?
Yes. Our metric kits are organised to ISO 3601 / DIN 3771 dimensions and are popular for servicing European and Asian machinery. The standard 407-piece metric service kit covers 32 ISO 3601 sizes from 3×1.5 mm to 50×5 mm in NBR 70 Shore A. FKM and EPDM metric kits are also available.
Can the kits be labelled with our part numbers?
Yes. For custom kits, we print your internal part numbers, descriptions, barcodes, and QR codes directly on compartment labels or bag headers. Labels are printed on oil-resistant stock—not standard paper stickers. This supports direct CMMS/ERP barcode scanning on the shop floor without re-labelling. MOQ for custom-labelled standard kits is typically 10 sets.
What is the MOQ for a custom O-ring kit?
Custom kit MOQ is typically 50–100 sets for fully bespoke assortments (custom sizes, custom quantities, custom materials). For simple custom labelling applied to a standard kit configuration, MOQ can be as low as 10 sets. Sample kits (1–2 sets) are available for evaluation before committing to production quantities.
How do I determine which sizes to include in a custom kit?
The most reliable approach is a 12-month consumption analysis from your maintenance records or CMMS. Pull every O-ring replaced in the past year, group by size and material, and rank by frequency. Include any size that was replaced more than twice per year. For new equipment without history, request the OEM's seal kit BOM—this lists every O-ring in the machine with quantities. We can build your custom kit directly from the BOM with appropriate buffer quantities per size.
What documentation comes with O-ring kits?
Standard kits include a packing list with size, material, durometer, compound designation, and piece count per compartment. On request, we provide: certificate of conformance (CoC) confirming compound specification; material data sheets (MDS/TDS); FDA compliance certificates for food-grade compounds; and lot-specific traceability records. For regulated industries (pharmaceutical, food, aerospace), specify documentation requirements at order time.
What is the shelf life of O-rings in a kit?
Properly stored O-rings have a shelf life of 5–10 years depending on material. NBR and EPDM: 7 years from manufacture date when stored at 15–25°C, away from ozone sources (motors, fluorescent lights), UV, and humidity above 65% RH. FKM and VMQ: 10+ years under the same conditions. FFKM: effectively unlimited. Store kits in sealed bags inside the compartment case, in a climate-controlled storeroom away from electrical equipment. ISO 2230 provides the full material-specific storage standard.
How do custom kits reduce overall seal spend compared to standard assortments?
Standard assortment kits inevitably include sizes that your specific equipment never uses—inventory that sits unused until the kit is eventually discarded. A custom kit contains only the sizes and materials required for your actual equipment fleet, eliminating obsolete inventory. Our analysis shows that organizations switching from standard assortments to custom kits typically reduce annual seal spend by 20–30% because every piece in the kit has a defined application. Additionally, custom kits reduce waste from incorrect material substitutions (installing an available but incompatible material because the correct one is not in the standard kit), which is a hidden cost driver in many maintenance operations.
Can kits be configured for specific regulatory requirements such as FDA, aerospace, or automotive?
Yes. We configure kits for regulated industries with full material certification and traceability documentation. For FDA applications, kits contain only compounds with FDA 21 CFR 177.2600 compliance, with material certificates confirming food-grade status. For aerospace, we supply kits containing AMS-specified compounds with full lot traceability and certificates of conformance. For automotive IATF 16949 facilities, kits are assembled under controlled conditions with documented material certifications and PPAP-level documentation available on request. Specify your regulatory framework when requesting a custom kit quotation, and our engineering team will ensure full compliance with your industry's quality standards.
What is included in a standard AS568 O-ring kit?
A standard AS568 O-ring kit contains an assortment of popular dash-number sizes in one material, usually 70 Shore A black NBR. A full-range kit typically covers 30–40 sizes from the -006 to -050, -110 to -178 and -210 to -284 series, with 200–450 pieces total. Each compartment is labelled with the AS568 dash number and piece count. The kit does not include FKM, EPDM or silicone unless you order a material-specific or mixed-material kit. Use size chart hub to verify which dash numbers correspond to your equipment groove dimensions.
How do I build a custom O-ring kit for my equipment fleet?
Start with a 12-month consumption analysis: list every O-ring replaced, group by size and material, and rank by frequency. Include any size replaced more than twice per year. Define materials per application — NBR for oil, FKM for high temperature/chemical, EPDM for water/steam, VMQ for food/pharma. Specify quantities based on 3–6 months of consumption plus buffer stock for critical equipment. Choose compartment labels with your internal part numbers if needed. Submit the list and we build the kit with compound-specific certificates. See O-ring kit selection guide for the full methodology.
Need a Custom Kit?
Tell us the sizes and materials you need, and we will quote a custom assortment.