OSK™ Max Truck O-Ring Kit Buna-N 70 & 90 Duro 1430 Pc
Built to Keep Service Trucks Working and Repair Shops Profitable
When a hydraulic hose fails or a fitting starts leaking, downtime costs money. The OSK™ Max Truck O-Ring Kit is designed to keep service trucks, hydraulic repair shops, and field technicians fully stocked with the most common AS568, Boss, and Flange O-Rings in Buna-N 70 and Buna-N 90 durometer compounds.
This professional-grade kit includes 1,430 total O-Rings of the most common Buna-N 70 Duro sizes, plus 155 Boss Buna-N 90 and 45 Flange Buna-N 90 O-Rings. You get the right hardness, the right cross sections, and the right sizes to seal hydraulic fittings correctly the first time. Less guesswork. Less downtime. More completed jobs per day.
Operating temperature: -40° to +250°F (–40° to +121°C)
Material & Performance Details
This kit includes:
- Buna-N (Nitrile) 70 Duro – Black
- Buna-N (Nitrile) 90 Duro – Black
Buna-N is the industry standard for hydraulic and petroleum-based systems due to its excellent oil resistance and dependable compression set performance.
Performance Strengths
- Strong resistance to petroleum oils and fuels
- Good abrasion resistance
- Excellent sealing in hydraulic applications
- Reliable performance in dynamic and static systems
Excellent resistance to:
- Petroleum oils
- Hydraulic fluids
- Diesel fuel
- Gasoline
- Mineral oils
Limited capability with:
- Ozone exposure
- Sunlight / UV
- Mild acids
Not compatible with:
- Strong acids
- Ketones
- Brake fluids (glycol-based)
- Aromatic hydrocarbons
The OSK™ MAX Truck O-Ring Kit includes the most common AS568 standard sizes across three cross sections plus Boss and Flange seals:
1,230pc Standard AS568 O-Rings in 68 different Buna-N 70 Duro sizes:
Box 1 -000 Series 1/16" CS (sizes and dimensions listed on the AS568 O-Rings Chart) :
- -006 through -018 25pcs/EA
- -019 through -022 20pcs/EA
- -023 through -026 15pcs/EA
- -028 through -030 15pcs/EA
Box 2 -100 Series 3/32" CS (sizes and dimensions listed on the AS568 O-Rings Chart) :
- -109 through -118 25pcs/EA
- -119 through -120 20pcs/EA
- -121 through -127 15pcs/EA
- -128 through -129 10pcs/EA
- -131 10pcs
- -133 10pcs
- -135 5pcs
Box 3 -200 Series 1/8" CS (sizes and dimensions listed on the AS568 O-Rings Chart) :
- -210 through 214 20pcs/EA
- -215 through -222 15pcs/EA
- -223 through -224 10pcs/EA
- -226 10pcs
- -228 10pcs
- -232 10pcs
- -236 10pcs
155pc Boss SAE -900 O-Rings in 8 different Buna-N 90 Duro sizes: Box 4
- -903 #3 Fitting 15pcs
- -904 #4 Fitting 25pcs
- -906 #6 Fitting 15pcs
- -907 #7 Fitting 25pcs
- -908 #8 Fitting 25pcs
- -910 #10 Fitting 25pcs
- -912 #12 Fitting 15pcs
- -916 #16 Fitting 10pcs
45pc Box 5 Flange Seals in 6 different Buna-N 90 Duro sizes: Bix 5
- Flange Fitting #8 10pcs
- Flange Fitting #12 10pcs
- Flange Fitting #16 10pcs
- Flange Fitting #20 5pcs
- Flange Fitting #24 5pcs
- Flange Fitting #32 5pcs
Applications & Use Cases
This kit is built for:
- Hydraulic service trucks
- Mobile repair technicians
- Heavy equipment repair
- Agricultural machinery
- Construction equipment
- Fleet maintenance shops
- Industrial maintenance departments
Whether sealing ORB fittings, Boss fittings, or hydraulic flange connections, this kit covers the most common field-repair scenarios so your team can complete jobs without waiting on parts.
Key Specifications
- Material: Buna-N (Nitrile)
- Durometer: 70A and 90A
- Color: Black
- Standard: AS568, Boss, Flange
- Temperature Range: -40° to +250°F (–40° to +121°C)
- Total Pieces: 1,430 O-Rings
- 1,230 Buna-N 70 Duro
- 155 Boss Buna-N 90
- 45 Flange Buna-N 90
Why Buy from The O-Ring Store LLC
When you buy this kit from us, you are not just getting O-Rings. You are getting support, accuracy, and reliability.
- ISO9001:2015 certified quality management
- USA stock for fast delivery
- Same-day shipping on in-stock items
- Full lot traceability available
- Custom kit configurations available
- Expert technical support
- Competitive pricing with no compromise on quality
We make getting O-Rings easy. That means the right sizes, the right durometer, and the right advice when you need it. Your benefit is simple: fewer comebacks, fewer leaks, and more completed service calls.
Frequently Asked Questions
1. Is this kit suitable for hydraulic service trucks?
Yes. It was specifically designed for mobile hydraulic repair technicians and service trucks that need the most common AS568, Boss, and Flange sizes on hand.
2. What is the difference between 70 and 90 durometer O-Rings?
70 Duro is more flexible and commonly used in standard hydraulic sealing. 90 Duro is harder and better suited for higher-pressure Boss and flange fittings where extrusion resistance is critical.
3. Can this kit be customized?
Yes. We build many customers O-Ring kits based on your most popular kits but Brand Labeled for them. (10 Kit Min)
