Price is for 1 complete set (225 O-rings).
Total Pieces: 225 rubber O-rings
Material: Black Nitrile Rubber (NBR) — Oil resistant
Sizes: 18 different metric sizes
Applications: Automotive · Plumbing · Hydraulic · Pneumatic · Sealing gaskets
Australian Stock · Fast Dispatch · OZ Wonderful
⬤ COMPLETE O-RING ASSORTMENT — EVERY SIZE YOU NEED ⬤
225 pieces · 18 metric sizes · Black nitrile rubber · Oil, fuel, and chemical resistant
Product: 225Pcs Rubber O-Ring Assortment Set — Black Nitrile Rubber
Total Pieces: 225 O-rings
Material: Black Nitrile Butadiene Rubber (NBR) — High quality rubber
Colour: Black
Number of Sizes: 18 different metric sizes
Size Range: #3 (3mm ID) to #22 (22mm ID)
Thickness Range: 1mm to 4mm cross-section diameter
Properties: Oil resistant · Fuel resistant · Chemical resistant · Temperature range -30°C to +120°C
Applications: Automotive seals · Plumbing gaskets · Hydraulic systems · Pneumatic fittings · Fuel system seals · Engine gaskets · Water pump seals
Compatible With: Cars · Trucks · Motorcycles · Boats · Industrial equipment · Hydraulic systems
Australian Stock: Yes — fast dispatch from local warehouse
225Pcs Rubber O-Ring Assortment Set — Black Nitrile
Metric Sizes #3 to #22 · Automotive Seal · Hydraulic Gasket Kit
Complete O-ring assortment with 225 pieces in 18 different metric sizes. Black nitrile rubber is oil, fuel, and chemical resistant. Essential for automotive, plumbing, hydraulic, and pneumatic repairs.
✅ Applications — Where To Use These O-Rings
Product Description — 225Pcs Rubber O-Ring Assortment Set
The 225Pcs Rubber O-Ring Assortment Set is a comprehensive collection of metric O-rings in 18 different sizes, ranging from #3 (3mm inner diameter) to #22 (22mm inner diameter). Made from high-quality black nitrile rubber (NBR), these O-rings provide excellent sealing performance in automotive, hydraulic, pneumatic, and plumbing applications.
Nitrile rubber (NBR) is the preferred material for oil and fuel sealing applications. It offers excellent resistance to petroleum-based oils, fuels, hydraulic fluids, and many chemicals. With a temperature range of -30°C to +120°C, these O-rings perform reliably in demanding environments, from engine bays to hydraulic systems.
The set includes the most commonly used metric O-ring sizes — from small #3 seals for precision applications up to #22 for larger fittings. Whether you're rebuilding a carburetor, repairing a hydraulic line, or replacing a plumbing gasket, you'll find the right size in this kit.
📋 Complete O-Ring Contents — 18 Metric Sizes (225 Pieces)
| Size (#) | Inner Diameter (mm) | Cross Section (mm) | Quantity | Typical Applications |
|---|---|---|---|---|
| #3×1 | 3mm | 1mm | 20 pcs | Small precision seals, carburetor jets |
| #4×1 | 4mm | 1mm | 20 pcs | Tiny fittings, fuel system seals |
| #4.5×2 | 4.5mm | 2mm | 20 pcs | Small hydraulic ports, valves |
| #5×2 | 5mm | 2mm | 20 pcs | Small fuel fittings, sensors |
| #6×2 | 6mm | 2mm | 20 pcs | Common small size, many applications |
| #6×2.5 | 6mm | 2.5mm | 20 pcs | Thicker seal for grooves |
| #6×3 | 6mm | 3mm | 20 pcs | Heavy duty small seals |
| #7×2 | 7mm | 2mm | 20 pcs | Automotive sensors, coolant fittings |
| #8×2 | 8mm | 2mm | 20 pcs | Very common size, fuel line seals |
| #9×2 | 9mm | 2mm | 5 pcs | Less common, specific applications |
| #10×2 | 10mm | 2mm | 5 pcs | Hydraulic fittings, plumbing |
| #12×3 | 12mm | 3mm | 5 pcs | Larger hydraulic seals |
| #13×3 | 13mm | 3mm | 5 pcs | Fuel pump seals, hoses |
| #14×2.5 | 14mm | 2.5mm | 5 pcs | Plumbing fittings, taps |
| #17×2.5 | 17mm | 2.5mm | 5 pcs | Pipe fittings, connectors |
| #18×4 | 18mm | 4mm | 5 pcs | Thick heavy duty seal |
| #20×2 | 20mm | 2mm | 5 pcs | Larger diameter fittings |
| #22×2 | 22mm | 2mm | 5 pcs | Maximum size in kit |
💡 Size Number Explanation: The size number (#3, #4, #5, etc.) refers to the inner diameter in millimetres. For example, #6×2 means 6mm inner diameter with 2mm cross-section thickness.
📊 Size Distribution Summary
| Smallest Size | #3×1 (3mm ID, 1mm CS) — 20 pieces |
| Largest Size | #22×2 (22mm ID, 2mm CS) — 5 pieces |
| Most Common Sizes | #3-8 range — 180 pieces (80% of kit) |
| Large Sizes (#9-22) | 45 pieces (20% of kit) |
| Total | 225 pieces · 18 different sizes |
🔧 Key Features & Benefits
⬤ Nitrile Rubber (NBR) — Why It's The Right Choice
What is Nitrile Rubber (NBR)? Nitrile butadiene rubber is a synthetic rubber copolymer with excellent resistance to oils, fuels, and chemicals. It's the most commonly used rubber for sealing applications in automotive and industrial environments.
Key Properties:
• Excellent resistance to petroleum-based oils and fuels
• Good resistance to hydraulic fluids and mineral oils
• Wide temperature range (-30°C to +120°C)
• Good abrasion resistance and tensile strength
• Low compression set — maintains seal shape over time
Not suitable for: Brake fluids (DOT), phosphate ester hydraulic fluids, ozone/weather exposure (use EPDM for those applications).
📏 Technical Specifications
| Product Type | Rubber O-Ring Assortment Set — Metric Sizes |
| Material | Black Nitrile Rubber (NBR / Buna-N) |
| Colour | Black |
| Total Pieces | 225 O-rings |
| Number of Sizes | 18 different metric sizes |
| Inner Diameter Range | 3mm — 22mm |
| Cross Section Range | 1mm — 4mm |
| Temperature Range | -30°C to +120°C |
| Hardness | 70 Shore A (standard industrial grade) |
| Applications | Automotive · Hydraulic · Pneumatic · Plumbing · Fuel systems |
📏 How To Choose The Correct O-Ring Size
💡 Pro Tip: If you're replacing an old O-ring, measure the cross-section thickness first. If the old O-ring has flattened, measure the groove depth to determine the correct CS.
🔍 Common Applications by Size
🔧 REAL USER APPLICATIONS 🔧
✅ Automotive: Used #6×2 O-ring to replace leaking fuel injector seal on a Toyota — perfect fit, leak stopped immediately.
✅ Hydraulic: #10×2 and #12×3 used for hydraulic fitting seals on log splitter — withstood 2500psi without leakage.
✅ Motorcycle: #8×2 O-ring for carburetor bowl gasket on vintage bike — fuel leak resolved.
✅ Plumbing: #14×2.5 used for tap valve seal — fixed dripping garden tap.
"Having all these sizes in one box has saved me so many trips to the parts store. The quality seems good — the rubber feels right for oil applications." — Workshop mechanic
🔧 Quick Selection Guide — Most Common Uses
🛢️ Chemical Compatibility — What Nitrile Resists
Excellent Resistance (Use with confidence): Engine oil, diesel fuel, petrol/gasoline, hydraulic oil, mineral oil, grease, transmission fluid, power steering fluid, gear oil.
Good Resistance (Generally OK): Water, diluted acids, diluted alkalis, propane, butane, LPG.
Poor Resistance (DO NOT USE): Brake fluid (DOT), phosphate ester fluids, strong acids, ozone/UV exposure, ketones (acetone, MEK), chlorinated solvents.
Important: For brake systems or outdoor/UV exposure applications, use EPDM rubber O-rings instead.
❓ Frequently Asked Questions
Shipping & Support — Australian Stock
⬤ 225Pcs Rubber O-Ring Assortment Set — Black Nitrile
18 Metric Sizes · #3×1 to #22×2 · Oil & Fuel Resistant · Automotive/Hydraulic/Plumbing
225 Pieces — Complete Seal Gasket Kit for Repairs and Maintenance
💡 Trade & Bulk Orders Welcome! Contact us for volume discounts for workshops and industrial users.
⚠️ REMINDER: Price is for 1 complete set (225 O-rings). Black nitrile rubber. Oil resistant. 18 metric sizes. Australian stock — fast dispatch.