Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
High-Quality BAS Shaft Combination Seal
PU & NBR Construction | Low-Friction for Hydraulic Systems
The High-Quality BAS Shaft Combination Seal is a premium dynamic sealing solution crafted from PU and NBR materials. Its PU component ensures exceptional wear resistance and low friction, while the NBR element provides reliable elasticity for consistent preload. Designed for hydraulic systems, it excels in cylinders and machinery, delivering stable performance under medium-to-high pressure. This seal balances durability and efficiency, extending service life and reducing energy loss in demanding applications.
5.0
design customization
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Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Product Advantages
Dual-Material Synergy: The PU component offers exceptional wear resistance (3-5x that of standard rubber) and low friction (≤0.3 coefficient), minimizing energy loss and heat generation. The NBR element provides reliable elasticity, ensuring consistent preload to compensate for wear and maintain tight sealing over time.
High-Pressure Stability: Designed to perform under medium-to-high pressure (up to 35MPa), withstanding pressure fluctuations and mechanical impact in dynamic hydraulic systems.
Long Service Life: Superior material durability and structural integrity reduce replacement frequency, lowering maintenance costs for industrial applications.
Product Principle
The seal operates on a "dynamic sealing + elastic preload" mechanism:
The PU segment forms the primary sealing interface with the piston rod, leveraging its low friction and wear resistance to prevent medium leakage during reciprocating or rotational movement.
The NBR component acts as an elastic preload element, applying constant pressure to the PU segment. Under system pressure, this creates a "self-tightening effect"—higher pressure enhances the seal’s contact with the rod, reinforcing sealing reliability.
Product Details
Material Specifications: PU (Shore A93) for the sealing lip, NBR (Shore A70) for the elastic element, both rigorously tested for compatibility with mineral oil-based hydraulic fluids.
Precision Design: Smooth surface finish on the PU contact area (Ra ≤0.8μm) reduces rod abrasion; compact structure fits standard grooves for easy installation without special tools.
Temperature Adaptability: Stable performance in -35℃ to 80℃ (peak 95℃ for short periods), suitable for harsh environmental conditions.
Application Range
Ideal for dynamic sealing in:
Construction machinery (excavator hydraulic cylinders, loader rams)
Agricultural equipment (tractor lift cylinders, harvester hydraulic systems)
Industrial hydraulic machinery (injection molding machines, forging presses)
Other medium-to-high pressure hydraulic piston rod systems.
Product Size Chart
| 1 | BAS6*14*5.7 | 43 | BAS38.1*47.65*7.94 | 85 | BAS76*91*13 | 127 | BAS45*55*10 |
| 2 | BAS6.35*12.7*3.18 | 44 | BAS38.1*50.8*6.35 | 86 | BAS76.2*95.25*15.75 | 128 | BAS50*58*10 |
| 3 | BAS9.53*15.88*6.35 | 45 | BAS38.1*50.8*9.53 | 87 | BAS76.2*88.9*9.52 | 129 | BAS50*60*7.3 |
| 4 | BAS12.7*19.05*4.76 | 46 | BAS40*50*7 | 88 | BAS76.2*92.7*12.5 | 130 | BAS50.8*63.5*6.35 |
| 5 | BAS12.7*19.05*6.35 | 47 | BAS40*50*7.3 | 89 | BAS76.2*101.6*15.87 | 131 | BAS51*63.5*7 |
| 6 | BAS13*19*4 | 48 | BAS41.28*47.63*9.53 | 90 | BAS80*92*9 | 132 | BAS55*70*7.5 |
| 7 | BAS15.88*22.23*3.18 | 49 | BAS41.28*50.8*4.76 | 91 | BAS82.55*95.25*9.52 | 133 | BAS55*63*10 |
| 8 | BAS19*25.4*3.35 | 50 | BAS41.28*50.8*7.94 | 92 | BAS82.55*98.42*9.52 | 134 | BAS63*75*14 |
| 9 | BAS19.05*25.4*3.18 | 51 | BAS41.28*50.8*9.52 | 93 | BAS82.55*101.6*9.52 | 135 | BAS63*78*10 |
| 10 | BAS19.05*25.4*4.76 | 52 | BAS44.45*50.8*6.35 | 94 | BAS82.55*101.6*12.7 | 136 | BAS70*80*11.5 |
| 11 | BAS19.05*25.4*6.35 | 53 | BAS44.45*57.15*9.53 | 95 | BAS86*96*12 | 137 | BAS82.55*95.25*9.53 |
| 12 | BAS19.05*31.75*6.25 | 54 | BAS44.45*60.33*11.11 | 96 | BAS88.9*101.6*9.52 | 138 | BAS95*110*11.4 |
| 13 | BAS22.23*28.56*6.35 | 55 | BAS47.63*73.03*15.8 | 97 | BAS90*105*6 | 139 | BAS95*105*11.4 |
| 14 | BAS25.4*31.75*3.18 | 56 | BAS50*60*10 | 98 | BAS100*112*14 | 140 | BAS99*110*11.4 |
| 15 | BAS25.4*31.75*4.76 | 57 | BAS50*63*9 | 99 | BAS101.6*114.3*6.35 | 141 | BAS100*108*8 |
| 16 | BAS25.4*31.75*6.35 | 58 | BAS50*65*10 | 100 | BAS101.6*114.3*9.52 | 142 | BAS100*110*11.4 |
| 17 | BAS25.4*31.75*9.53 | 59 | BAS50*65*12 | 101 | BAS114.3*127*6.35 | 143 | BAS119*130*11.4 |
| 18 | BAS25.4*34.93*4.76 | 60 | BAS50.8*63.5*6.35 | 102 | BAS114.3*127*9.5 | 144 | BAS120*130*11.4 |
| 19 | BAS25.4*34.93*7.95 | 61 | BAS50.8*63.5*9.52 | 103 | BAS114.3*127*9.53 | 145 | BAS124*135*11.4 |
| 20 | BAS25.4*38.1*6.35 | 62 | BAS50.8*63.5*14.29 | 104 | BAS114.3*133.35*15.88 | 146 | BAS125*133*6.5 |
| 21 | BAS25.4*38.1*9.53 | 63 | BAS50.8*65.88*12.7 | 105 | BAS120*150.5*18 | 147 | BAS125*135*11.4 |
| 22 | BAS28.58*34.93*6.35 | 64 | BAS53.97*63.5*6.35 | 106 | BAS130*150*14.5 | 148 | BAS125*145*14.5 |
| 23 | BAS28.58*38.1*4.76 | 65 | BAS53.98*63.5*14.29 | 107 | BAS130*150.8*18 | 149 | BAS133.4*146.1*14.4 |
| 24 | BAS28.6*34.9*6.4 | 66 | BAS57.1*72.8*12.7 | 108 | BAS133.5*152.4*15.75 | 150 | BAS135*148*14.5 |
| 25 | BAS30.16*26.99*3.18 | 67 | BAS57.15*66.68*9.52 | 109 | BAS150*170*14.5 | 151 | BAS139*150*10.5 |
| 26 | BAS30.16*39.69*4.76 | 68 | BAS57.15*66.68*9.95 | 110 | BAS150*180*15 | 152 | BAS139.7*152.5*14 |
| 27 | BAS31.75*41.28*4.76 | 69 | BAS57.15*69.85*9.52 | 111 | BAS158.75*177.8*15.75 | 153 | BAS140*150*10.5 |
| 28 | BAS31.75*41.28*7.95 | 70 | BAS57.15*73.05*9.52 | 112 | BAS160*172*14 | 154 | BAS150*160*12 |
| 29 | BAS31.75*41.28*9.53 | 71 | BAS57.15*76.2*9.53 | 113 | BAS170*185*11.4 | 155 | BAS154*165*13 |
| 30 | BAS31.75*38.1*6.35 | 72 | BAS60*75*11.4 | 114 | BAS170*200*15 | 156 | BAS155*165*13 |
| 31 | BAS31.75*44.45*6.35 | 73 | BAS63.5*73.03*9.52 | 115 | BAS200*225*18.5 | 157 | BAS159*170*13 |
| 32 | BAS31.75*47.63*11.11 | 74 | BAS63.5*76.2*6.35 | 116 | BAS220*250*15 | 158 | BAS160*170*13 |
| 33 | BAS31.75*50.8*6.35 | 75 | BAS63.5*76.2*9.52 | 117 | BAS230*260*15 | 159 | BAS171.4*184.1*14.2 |
| 34 | BAS34.8*47.5*9.52 | 76 | BAS63.5*82.55*14.29 | 118 | BAS16*24*5 | 160 | BAS172*185*14.5 |
| 35 | BAS34.92*50.8*7.93 | 77 | BAS63.5*82.55*15.75 | 119 | BAS16*25*8 | 161 | BAS177.82*196.85*9.6 |
| 36 | BAS34.93*44.45*7.95 | 78 | BAS65*80*10 | 120 | BAS18*26*5 | 162 | BAS178*197*9.5 |
| 37 | BAS34.93*44.45*9.53 | 79 | BAS66.68*76.2*9.53 | 121 | BAS31.75*41.28*4.5 | 163 | BAS180*190*12 |
| 38 | BAS34.93*50.8*11.11 | 80 | BAS68*80*14 | 122 | BAS34.93*41.28*6.6 | 164 | BAS184*195*15 |
| 39 | BAS35*41*7 | 81 | BAS69.85*82.55*9.52 | 123 | BAS38.1*47.625*5 | 165 | BAS185*195*15 |
| 40 | BAS38*44.5*4.8 | 82 | BAS69.85*88.9*14.29 | 124 | BAS42*50*8 | 166 | BAS209.4*225.3*14.4 |
| 41 | BAS38.1*44.45*6.35 | 83 | BAS70*78*10 | 125 | BAS44.5*54*5 | 167 | BAS209.5*222.25*14.4 |
| 42 | BAS38.1*47.63*9.53 | 84 | BAS72*86*12 | 126 | BAS45*55*5 | 168 | BAS228.6*248.4*16 |
| 169 | BAS280*304*17.5 |
FAQ
Q: What fluids is this seal compatible with?
A: Optimized for mineral oil-based hydraulic fluids. Avoid exposure to strong solvents, synthetic esters, or acidic/basic media.
Q: What is the maximum operating speed?
A: Recommended for speeds ≤0.5m/s to ensure minimal wear and heat buildup.
Q: How to ensure proper installation?
A: Ensure the rod surface is free of burrs or scratches (Ra ≤0.8μm); install with the PU lip facing the medium side.
FOREVER SEALS Selling Points
Quality Assurance: Each FOREVER SEALS BAS seal undergoes strict pressure testing and material certification to meet international industrial standards, ensuring consistent performance.
Customization Capability: FOREVER SEALS offers tailored sizes and material variants (e.g., FKM for high-temperature needs) to match specific customer requirements, backed by advanced manufacturing processes.
Technical Support: The FOREVER SEALS team provides dedicated installation guides, maintenance advice, and responsive after-sales service to maximize seal longevity and system efficiency.
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