Sealed Bearings
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| 16pcs TRAXXAS SLASH 4X4 SLASH 4X4 PLATINUM Rubber Sealed Ball Bearing Set | |
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$6.50 (1 Bid) Time Remaining: 10h 1m |
| 6900 2RS sealed bearings ABEC7 10x22x6 rubber seal 10 pieces | |
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$4.95 Time Remaining: 1d 9h 9m Buy It Now for only: $4.95 |
| 24pcs TAMIYA TL 01 TL 01LA TL 01B Rubber Sealed Ball Bearing Set | |
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$7.99 Time Remaining: 10h 2m |
| 18pcs HPI 18 VORZA 4WD BUGGY Rubber Sealed Ball Bearing Set | |
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$6.99 (1 Bid) Time Remaining: 10h 2m |
| 5x10 x4mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.80 Time Remaining: 15d 22h 22m Buy It Now for only: $1.80 |
| 14pcs TAMIYA ASTUTE NISSAN KING CAB TOYOTA HILUX Metal Sealed Bearing Set | |
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$5.50 Time Remaining: 10h 9m |
| 14pcs HPI SPRINT SPRINT 2 Metal Sealed Ball Bearing Set | |
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$5.50 Time Remaining: 10h 12m |
| 8x16x5mm Ball Bearing 688 2TS Bearing Teflon Sealed 688 Bearing 8x16mm | |
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$2.99 Time Remaining: 25d 6h 49m Buy It Now for only: $2.99 |
| 15pcs TEAM ASSOCIATED RC18T RC18MT RC18B RC18R Rubber Sealed Bearing Set | |
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$5.99 Time Remaining: 10h 14m |
| 28pcs OFNA JAMMIN X1 CR PRO Rubber Sealed Ball Bearing Set | |
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$9.50 Time Remaining: 10h 18m |
| 14pcs YOKOMO MR 4TC MR 4MT Metal Sealed Ball Bearing Set | |
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$5.50 (1 Bid) Time Remaining: 10h 21m |
| 5x11 x4mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.80 Time Remaining: 15d 22h 21m Buy It Now for only: $1.80 |
| Traxxas 4907 T Maxx 4x4 Nitro 33 Blue Sealed Axle Bearings Complete Set 8 | |
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$0.95 Time Remaining: 18h 19m |
| 35pcs TAMIYA TXT 1 Metal Sealed Ball Bearing Set | |
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$9.50 Time Remaining: 1d 10h 2m |
| New 10pcs 6x10 x3mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$6.59 Time Remaining: 25d 21h 39m Buy It Now for only: $6.59 |
| 14pcs HPI 110 BLITZ SHORT COURSE TRUCK Metal Sealed Ball Bearing Set | |
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$5.50 Time Remaining: 1d 10h 4m |
| 24pcs KYOSHO V One RRR V One R4 Metal Sealed Ball Bearing Set | |
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$7.99 Time Remaining: 1d 10h 6m |
| 32pcs TAMIYA CR 01 Metal Sealed Ball Bearing Set | |
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$9.50 Time Remaining: 1d 10h 6m |
| 10x15 x4mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$2.00 Time Remaining: 15d 22h 35m Buy It Now for only: $2.00 |
| 14pcs TEAM LOSI XXX T CR Metal Sealed Ball Bearing Set | |
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$5.99 Time Remaining: 1d 10h 7m |
| 15pcs TEAM LOSI HIGH ROLLER STRIKE Metal Sealed Ball Bearing Set | |
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$5.99 Time Remaining: 1d 10h 13m |
| 8x16 x5mm Blue Rubber Seals Bearings ABEC 3 | |
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$1.90 Time Remaining: 22d 16h 8m Buy It Now for only: $1.90 |
| 24pcs OFNA JAMMIN X2 Metal Sealed Ball Bearing Set | |
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$7.99 Time Remaining: 1d 10h 14m |
| 18pcs KYOSHO LAZER ZX 5 FS 4WD BUGGY Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 1d 10h 15m |
| Traxxas 5116 Sealed Ball Bearings 5x11x4mm 2 Rustler VXL | |
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$2.93 Time Remaining: 10d 4h 29m Buy It Now for only: $2.93 |
| 18pcs YOKOMO B MAX4 4WD BUGGY Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 1d 20h 46m |
| LOSI 5IVE T 8 PC RUBBER SEALED WHEEL BEARING KIT BY FULLFORCE RC | |
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$15.00 Time Remaining: 2d 8h 47m Buy It Now for only: $18.00 |
| LOSI TEN T 10T 22 PC FULL RUBBER SEALED BEARING KIT BY FULLFORCE RC | |
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$16.00 (1 Bid) Time Remaining: 2d 8h 49m |
| 6x10 x3mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.80 Time Remaining: 17d 18h 59m Buy It Now for only: $1.80 |
| AXIAL SCX10 SCORPION 28 PC FULL RUBBER SEALED BEARING KIT BY FULLFORCE RC | |
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$24.99 Time Remaining: 2d 8h 51m Buy It Now for only: $30.00 |
| Losi Ten SCTE 4WD SEALED BEARINGS 10 T Ten T US FREE SHIPPING LOSB0128 | |
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$1.54 (5 Bids) Time Remaining: 2d 9h 46m |
| 5x11x4mm Ball Bearing MR115 2TS Bearing Teflon Sealed MR115 Bearing | |
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$2.99 Time Remaining: 25d 7h 7m Buy It Now for only: $2.99 |
| 18pcs MUGEN SEIKI MBX 6 MBX 6T Rubber Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 2d 10h 2m |
| 16pcs XRAY NT1 NITRO TOURING NT1 2009 SPECS Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 2d 10h 4m |
| 16pcs TRAXXAS EP STAMPEDE EP RUSTLER EP BANDIT Rubber Sealed Bearing Set | |
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$6.50 Time Remaining: 2d 10h 6m |
| 5x8 x25mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.80 Time Remaining: 20d 3m Buy It Now for only: $1.80 |
| 36pcs TAMIYA JUGGERNAUT 1 JUGGERNAUT 2 Metal Sealed Ball Bearing Set | |
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$9.99 Time Remaining: 2d 10h 9m |
| 22pcs HPI SAVAGE 21 25 SS SS 46 X XSS Metal Sealed Ball Bearing Set | |
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$7.50 (1 Bid) Time Remaining: 2d 10h 9m |
| Team Losi 1 10 TEN T SEALED BEARINGS 8 axle ball LOSB0819 | |
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$8.99 Time Remaining: 22d 2h 25m Buy It Now for only: $8.99 |
| 16pcs KYOSHO 110 USA 1 MONSTER TRUCK Rubber Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 2d 10h 15m |
| 14pcs TRAXXAS JATO JATO 33 Metal Sealed Ball Bearing Set | |
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$5.50 Time Remaining: 2d 10h 19m |
| 5x9 x3mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.80 Time Remaining: 15d 23h 1m Buy It Now for only: $1.80 |
| Team Losi XXX SCT 1 10 Short Course Truck 8 Count Rubber Sealed Wheel Bearings | |
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$0.99 Time Remaining: 2d 10h 28m |
| NEW MUGEN MBX6R USA KIT RUBBER SEALED BEARING KIT mbx 6r mbx 6t KYOSHO OFNA HPI | |
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$0.99 (1 Bid) Time Remaining: 2d 10h 52m |
| 22pcs TAMIYA TGM 03 TNX MONSTER TRUCK Metal Sealed Ball Bearing Set | |
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$6.99 Time Remaining: 2d 22h 12m |
| 6x12x4mm Ball Bearing MR126 2TS Bearing Teflon Sealed MR126 Bearing | |
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$2.99 Time Remaining: 25d 6h 44m Buy It Now for only: $2.99 |
| 24pcs TEAM LOSI 110 COMP CRAWLER Metal Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 2d 22h 15m |
| HPI Baja 5sc SS SEALED BEARINGS 12x24x6 B089 Axle Ball 107173 | |
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$0.99 (1 Bid) Time Remaining: 3d 9h 45m |
| 10pcs 5 x 8 x 25mm Metal Sealed Ball Bearings | |
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$5.00 Time Remaining: 28d 8h 20m Buy It Now for only: $5.00 |
| 14pcs TEAM ASSOCIATED EP TC5F TC5R TC5 FT Metal Sealed Ball Bearing Set | |
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$5.50 Time Remaining: 3d 10h 5m |
| 14pcs DURATRAX EVADER EXB EVADER EXT Rubber Sealed Ball Bearing Set | |
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$5.99 Time Remaining: 3d 10h 10m |
| 25pcs MUGEN SEIKI MTX 4 MTX 4R Metal Sealed Ball Bearing Set | |
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$7.99 Time Remaining: 3d 10h 14m |
| 4x8 x3mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$1.90 Time Remaining: 22d 10h 50m Buy It Now for only: $1.90 |
| 14pcs CORALLY 110 RDX Phi Metal Sealed Ball Bearing Set | |
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$5.50 Time Remaining: 3d 10h 31m |
| 16pcs SERPENT 18 966 Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 3d 10h 34m |
| 15x21 x4mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$3.00 Time Remaining: 20d 27m Buy It Now for only: $3.00 |
| 16pcs DURATRAX STREET FORCE GP STREET FORCE GP2 Metal Sealed Bearing Set | |
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$5.99 Time Remaining: 3d 10h 35m |
| 17pcs TAMIYA TB 03 TB 03D TB 03R Rubber Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 3d 10h 41m |
| 16pcs TRAXXAS SLASH 4X4 SLASH 4X4 PLATINUM Metal Sealed Ball Bearing Set | |
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$8.50 Time Remaining: 14d 10h 47m Buy It Now for only: $8.50 |
| 22pcs HPI E SAVAGE Metal Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 3d 10h 42m |
| 16pcs SERPENT 18 960 08 Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 3d 10h 43m |
| ProTek R C 8x14x4mm rubber sealed wheel bearings 4 | |
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$1.99 Time Remaining: 3d 11h 52m |
| 10x16 x4mm Blue Rubber Seals Ball Bearings ABEC 3 | |
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$2.70 Time Remaining: 15d 22h 4m Buy It Now for only: $2.70 |
| ProTek R C 8x14x4mm rubber sealed wheel bearings 4 | |
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$1.99 Time Remaining: 3d 11h 52m |
| 14pcs TEAM LOSI JRX S JRX S PRO JRX S TYPE R Metal Sealed Ball Bearing Set | |
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$5.99 Time Remaining: 3d 12h 54m |
| Blue sealed ball bearings for Tamiya Hornet Grasshopper Lunchbox etc | |
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$6.83 Time Remaining: 7h 13m Buy It Now for only: $6.83 |
| SCHUMACHER AXIS 2 PRO MI2 EC MISSION SST SPORT Metal Sealed Bearing Set | |
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$5.99 Time Remaining: 3d 12h 55m |
| 16pcs YOKOMO GT 4 Rubber Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 3d 12h 55m |
| 18pcs THUNDER TIGER TOMAHAWK BX TOMAHAWK ST Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 3d 12h 56m |
| Team Durango DNX408 SEALED BEARINGS axle wheel ball | |
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$9.99 Time Remaining: 23d 34m Buy It Now for only: $9.99 |
| OFNA Jammin SCRT10 CRT5 Rubber Sealed Axle Bearings | |
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$0.99 (1 Bid) Time Remaining: 4d 7h 26m |
| New HPI Nitro RS4 3 Evo + Rubber Sealed Axle Bearings Set of 8 | |
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$0.99 (1 Bid) Time Remaining: 4d 9h 27m |
| 6 x 10 x 3mm Blue Rubber Sealed Bearing | |
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$1.19 Time Remaining: 16d 1h 42m Buy It Now for only: $1.19 |
| Savage Flux HP 2350 X XL Set of 8 Rubber Sealed Axle Bearings HPI B085 | |
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$0.99 Time Remaining: 4d 9h 33m |
| TEN T SEALED BEARINGS 8 axle ball LOSB0126 Team Losi 1 10 | |
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$0.99 Time Remaining: 4d 9h 37m |
| Traxxas 4907 T Maxx 4x4 Nitro 33 Blue Sealed Axle Bearings Complete Set 8 | |
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$8.95 Time Remaining: 3d 2h 51m Buy It Now for only: $8.95 |
| 22pcs TRAXXAS E REVO REVO 33 PLATINUM Metal Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 4d 10h 1m |
| 22pcs HPI SAVAGE 21 25 SS SS 46 X XSS Metal Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 4d 10h 2m |
| 21pcs TAMIYA DF03 DF03RA Metal Sealed Ball Bearing Set | |
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$6.99 Time Remaining: 4d 10h 4m |
| Serpent 811 Cobra T Rubber Seal Bearing Set ABEC 3 | |
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$10.00 Time Remaining: 27d 20h 51m Buy It Now for only: $10.00 |
| 22pcs KYOSHO MINI INFERNO Metal Sealed Ball Bearing Set | |
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$6.99 Time Remaining: 4d 10h 5m |
| 22pcs HPI E SAVAGE Rubber Sealed Ball Bearing Set | |
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$7.50 Time Remaining: 4d 10h 6m |
| Rubber Sealed Bearings 5x10 x4mm bearing 10 pcs | |
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$10.99 Time Remaining: 10d 19h 31m Buy It Now for only: $10.99 |
| 17pcs TEAM LOSI XXX NT Adam Drake 2 Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 4d 10h 6m |
| 16pcs XRAY 118 M18 PRO M18MT M18T N18MT N18T Metal Sealed Bearing Set | |
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$5.99 Time Remaining: 4d 10h 7m |
| Losi Mini T Ball bearing Set Teflon Sealed NIP | |
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$8.99 Time Remaining: 4d 10h 10m |
| 8 x 16 x 5mm Teflon Sealed Bearing 6882TS | |
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$1.19 Time Remaining: 23d 7h 1m Buy It Now for only: $1.19 |
| 16pcs TEAM LOSI NXT SPEED T XXX DESERT TRUCK Metal Sealed Bearing Set | |
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$5.99 Time Remaining: 4d 10h 10m |
| 33pcs TEAM ASSOCIATED MGT 80 4WD MONSTER TRUCK Metal Sealed Ball Bearing Set | |
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$9.50 Time Remaining: 4d 10h 10m |
| NMB R 1350S 20 Used 13mm OD x 4mm x 5mm ID Rubber Sealed HDD Motor Bearings | |
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$10.00 Time Remaining: 27d 6h 36m Buy It Now for only: $10.00 |
| 18pcs KYOSHO MP9 MP9e 4WD BUGGY Rubber Sealed Ball Bearing Set | |
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$6.99 Time Remaining: 4d 10h 11m |
| 18pcs KYOSHO 110 DBX DBX VE DST Metal Sealed Ball Bearing Set | |
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$6.50 Time Remaining: 4d 12h 7m |
Reciprocating Hydraulic Seals for Water-based Fluids
A major use of water based fluids is in longwall mining roof supports, where HFA (5 / 95) fluids are generally used. These have the advantage over mineral oil of much greater fire resistance and lower cost and over plain water in that the 5% component provides corrosion protection, and a bactericide, which means that stainless steel components are not required, and that maintenance of the fluid is easier. Their disadvantage is poor lubricity. In recent years there have been major developments in the sealing technology used in roof support applications.
SEALS FOR ROOF SUPPORT CYLINDERS
The mining roof support has hydraulic cylinders for two separate purposes. The legs, which are often double telescopic cylinders, support the roof of the mine. The ram is generally a conventional double acting cylinder for positioning purposes. The legs are semi-static when loaded by the roof, and the full bore pressures are governed by a yield valve which will release fluid, allowing the cylinder to slowly converge at pressures between 400 and 500 bar. In the case of a double telescopic cylinder the pressure in the inner stage is trapped, and will be greater than that in the outer stage by the area ratio of the bores. 1000 bar pressures are not uncommon in these instances.
In a converging leg friction and pressure forces on the piston seal are additive, unlike a conventional double acting cylinder where the forces are opposed. This obviously increases the extrusion forces on the piston seal during convergence. Maximum pump pressures, which are fed to both the annuli of the legs for lowering the roof support chock, and to the positioning rams are now around 315 bar. It is fortunate that the operation of the roof support cylinders is intermittent in view of the poor lubricity of the HFA fluids.
Over the years sealing applications have evolved from the traditional rubber and rubber-fabric seal constructions to a design which has a face of hard wearing thermoplastic polyester elastomer in contact with the bore, whereas the older design relies on a nitrile rubber dynamic sealing element.
The initial objective of the development which led to the polyester faced design was a seal which could run on a greater range of bore finishes than the rubber-fabric design.
During the 1980’s, the fluids used in roof support equipment were generally mineral oil based emulsions, HFAE. These formed a soapy scum which helped to provide boundary lubrication for the seals and bearings in cylinders, but these tended to block valves and filters. For these reasons cleaner fluids, both micro emulsions and synthetic HFAE’s were developed. There has also been a growing requirement for environmentally acceptable fluids to be used in these applications. As such newer fluids did not in many cases provide the lubricity of the older HFAE’s which in turn saw problems arise due to the destruction of seals with rubber dynamic elements. As the piston seal in the roof support leg is critical in supporting the roof, the change from the old design to the new has been rapid.
With regard to gland sealing, these are, of course less safety critical, but visible leaking is becoming increasingly unacceptable.
Plastic bearings have long been used on the pistons to avoid the possibility of metal-to-metal pick up; however s.g. iron bearings were commonly used on both chrome-plated and phosphor-bronze plated rod finishes. This inevitably led to rod and gland scoring with increasingly arduous duty, this problem has been overcome by the use of fabric-reinforced polyester bearing strips. Dirt entry and corrosion problems have led to improvements in wiper designs with the introduction of an external flap on the wiping lip to prevent the entry of dirt via the outer diameter of the wiper. The gland seal design continues to include a plastic anti-extrusion ring, but is now of a larger section to withstand the increased metal-to-metal gaps which are the result of using bearing strip, the sealing material is now a responsive hydrolysis-resistant thermoplastic polyurethane, energised by a nitrile element.
For over 100 years, Hallite Seals, who are an ISO 9001 accredited manufacturer and provider of Hydraulic Seals and sealing solutions to the global fluid power industry, has been at the cutting edge of fluid power technology, manufacturing a wide range of rod / gland, piston, wiper and static seals.
About the Author
Hallite Seals International are an ISO 9001 accredited manufacturer and provider of Hydraulic Seals and sealing solutions to the global fluid power industry. We operate in all five continents of the world, and work with a number of major international brands - renowned for their commitment to engineering excellence.
For over 100 years Hallite Seals International has been at the cutting edge of fluid power technology, manufacturing a wide range of rod / gland, piston, and static seals, as well as support and bearing components, for technically challenging applications, from a wide range of materials which include Polytetrafluoroethylene (PTFE), Polyurethane (AU), nitrile rubbers (NBR) and Fluoro-elastomers (FKM).
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