Hydraulic seals, O-rings and sealing components
Stocked by Raj Trading Corporation in Chennai - rod and piston seals, wipers, buffer seals, wear rings, back-up rings and packings, in NBR, polyurethane, FKM, PTFE, silicone and EPDM. Send a part code, a drawing or the measured dimensions of the worn seal for a quotation.
Kastas
10 rangesKastas Sealing Technologies of Turkey, represented in Chennai by Raj Trading Corporation. The range runs from chevron rod packings and U-cup seals through compact piston sets, static seals and guide tape to a full pneumatic programme. Each range below carries its technical sheet, cut from the 2026 Kastas item list, with every part code and size in it. Send a code or the measured dimensions of the worn seal for a quotation.
Chevron Rod Packing
Multi-piece chevron rod packing sets for heavy duty hydraulic cylinders. A K01 set stacks a header ring, fabric-reinforced elastomer middle rings and a back ring into one groove, so the stack can be adjusted to the duty rather than replaced as a unit. Suited to presses, heavy plant and high pressure rod applications. Stocked in Chennai by Raj Trading Corporation.
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Wiper Seals
Rod wipers and scrapers that keep dust, grit and water spray out of a hydraulic cylinder, which is what decides how long the rod seal behind them lasts. The range covers polyurethane and nitrile wipers, snap-in and press-fit designs, and profiles such as K05 with an additional static sealing lip. Eight profiles across the full bore range, stocked in Chennai.
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Compact Piston Seal Set
Double acting compact piston seal sets, where the sealing ring, its anti-extrusion rings and the guide elements all sit in a single groove. That makes them the usual choice when a cylinder has to be rebuilt to a shorter piston or a tighter housing. Covers K16, K18, K20, K42, K46, K518 and the high performance K518X. Supplied from Chennai.
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Rod & Piston U Cup Seals
Single acting U-cup seals with a symmetrical profile, so the same seal serves a rod or a piston application. The widest range Kastas publishes and the one most maintenance enquiries land on: polyurethane and fabric-reinforced profiles including K21, K22, K23, K31, K32, K33, K37, K38 and the XT200 and XT300 series. Held ex-stock in Chennai across the full size table.
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Rod & Piston PU Seal + O-Ring
Polyurethane U-rings energised by an elastomer O-ring, which keeps the lip loaded at low pressure where a plain U-cup can weep. Symmetrical, so K920 and K921 fit rod or piston applications from the same part. Supplied from Chennai for cylinder builders and maintenance departments.
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Hydraulic Piston Seal
Hydraulic piston seals for single acting cylinders, covering the K15 and K49 profiles. Chosen where the piston seals in one direction and the return is handled by the load or a second seal, which is the common arrangement on presses and lifting rams. Stocked in Chennai by Raj Trading Corporation.
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Buffer-Rod Seal
Buffer seals fitted ahead of the rod seal to take the pressure spikes before they reach it. On mobile plant and anywhere the load fluctuates hard, a buffer is what stops a rod seal failing early rather than wearing out. K29 profile, supplied from Chennai.
ExploreStatic Seal
Static seals and back-up rings for housings, end caps and flange faces, where nothing moves but the joint still has to hold pressure. Back-up rings also sit behind an O-ring to stop it extruding into the clearance gap as pressure rises. Covers K83, K84 and K85 across a long size range, stocked in Chennai.
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Rod Seal - Water + Oil
Chevron rings in water-resistant fabric-impregnated elastomer, made for water and water-oil emulsion rather than mineral oil. The usual answer on water hydraulics and on presses running an emulsion, where a standard polyurethane rod seal swells and fails. K150 profile, supplied from Chennai.
ExploreGas Spring Seal
Rod seals for gas springs, where the sealing job is to hold a charge of nitrogen for years rather than to seal hydraulic oil for a duty cycle. KGS profile, supplied from Chennai by Raj Trading Corporation.
ExplorePTFE bronze guide strip, hard polyester guide strip and PTFE bronze piston guide rings, cut to length or ring-formed to carry the side load off the sealing elements. Getting the guidance right is what keeps a rod concentric, and a seal running off-centre will not last whatever profile it is. Static and dynamic load ratings, top speed and the full size range are in the sheet. Supplied from Chennai.
The full Kastas pneumatic programme, K25 through K65, and the Tecnolan pneumatic range beside it: piston seals, combi seals that seal and guide from one groove, single acting piston U-seals, end-of-stroke cushioning seals, wiper seals, Tudo piston seals and magnetic piston seals for sensed cylinders. Pneumatic profiles are cut for low breakaway friction and for dry or minimally lubricated running, which is why a hydraulic seal of the same bore is usually the wrong part in an air cylinder. Twenty-six profiles, every size in the one technical sheet, stocked in Chennai by Raj Trading Corporation.
Insulation matting rated to 35 kV, for switchboards, control rooms and the floor in front of live panels. High quality rubber in a coin pattern, black or blue, 1 m wide, in 2 m and 10 m lengths and 2 mm, 2.5 mm or 3 mm thick, working from -20°C to +70°C. Anti-slip wet or dry, resistant to abrasion, and easy to wipe down. Stocked in Chennai by Raj Trading Corporation and cut to the run you need. Other colours on request. The sheet below carries the full specification; send the length of the board and the thickness for a quotation.
Levelling and anti-vibration mounts for machine tools, presses, compressors, pumps and generator sets, carrying 50 kg to 3000 kg per mount. The LK Series covers twenty sizes from LK 100 at 50-75 kg to LK 3000 at 2000-3000 kg, in M10, M12, M16, M20 and M24 threads, each a levelling screw over a bonded rubber pad so a machine can be set flat and isolated from the floor in one fitting. Louison Cushy Foot mounts cover the heavier bonded rubber and cast iron feet, A, B, AB and S types, from 75 kg to 1580 kg. Mounting a machine on isolators rather than bolting it down cuts the vibration it puts into the floor and the noise it puts into the building, and it stops a neighbouring machine shaking the one being set up. Stocked in Chennai by Raj Trading Corporation. The specification sheet below carries every model with its dimension and load range; send the machine weight and the number of mounting points for a quotation.
Platinum and peroxide cured silicone tubing, braided and wire reinforced hoses, inflatable gaskets, O-rings and moulded rubber components, imported and stocked in Chennai by Raj Trading Corporation. Twenty product families across 112 item codes. Platinum cured silicone is the grade for pharmaceutical, biotech and food contact work, where it is chosen for a cleaner cure with no peroxide by-products and lower extractables; peroxide cured tube is the general purpose grade for the same sizes at lower cost. Hoses are reinforced to suit the duty: polyester braid for pressure, SS 316L helical wire where a line has to take suction or resist kinking, fabric wrapping over wire for the heaviest transfer duty, and a PTFE lined, SS 304 braided, silicone covered construction where the fluid needs a chemically inert bore. The range also covers FEP encapsulated O-rings, tri-clover and moulded gaskets, diaphragms, corona treater sleeves, extruded door seals, silicone cords, bellows, expansion joints and rubber sheeting. The item list below carries every size against its RTC item code; send the bore, the wall and the duty for a quotation.
Silicone rubber tubing, braided hose, O-rings, extruded cord and strip, vibro sifter gaskets and food grade sheeting, stocked and supplied in Chennai by Raj Trading Corporation. Platinum cured silicone is the grade for pharmaceutical, biotechnology and food contact work, chosen for a cleaner cure with no peroxide by-products; peroxide cured tube covers the same sizes at lower cost for general purpose duty. Nylon braided hose takes the working pressures plain tube cannot, from 2 bar at 50 mm bore to 10 bar at 6 mm, and stays translucent so flow through the line remains visible. O-rings are supplied in silicone and, where the fluid rules silicone out, in FKM (Viton), EPDM, nitrile, neoprene and PTFE. Extruded cord and strip is cut and joined into gaskets for autoclave and oven doors and for vessels no standard ring fits; U section sifter gaskets seal vibro sifter and sieve decks; sheeting runs 1 mm to 10 mm on 1200 mm wide, 10 metre rolls in red, white and transparent. All of it holds from minus 60 to plus 220 degrees C and complies with FDA 21 CFR 177.2600, REACH and RoHS, with USP Class VI and ISO 10993-1 on the platinum cured grades. The specification sheet below carries the grades, approvals and service limits for all six; send the bore and wall, the section, the deck diameter or the thickness for a quotation.
Precision and power transmission shaft couplings stocked and supplied in Chennai by Raj Trading Corporation, in seven ranges from a 14 mm encoder coupling to a 200 mm jaw coupling rated at 4500 Nm. A coupling carries torque across the misalignment between two shafts, so the first choice is whether it has to absorb that misalignment or hold the shafts rigidly in line. For encoders, tachogenerators and stepper motors there are one piece beam couplings with a helical slit (types AF and AS, 14 to 50 mm outer diameter), polyurethane element encoder couplings (type EC) and plastic disc couplings (type DC) that run to 12000 rpm. For servo motors, ball screws and CNC axes, where backlash is not acceptable at higher torque, there are precision jaw couplings on a polyurethane spider (type GS, size 9 to 55, 1.8 to 685 Nm) and stainless steel lamina disc couplings in single and double pack (types SL and DL, size 5 to 42). For pumps, gearboxes, conveyors, cooling towers and rolling mills there are industrial jaw couplings (type GR, size 19 to 90, 10 to 4500 Nm) with a choice of 64 Shore D, 92 Shore A or 98 Shore A spider. Where two shafts must be held as one with no angular freedom there are rigid clamping couplings in steel and stainless, one piece or split (types ST, SS, STS and SSS, 10 to 30 mm bore). Hubs are supplied unbored, pilot bored or finish bored with keyway. The specification sheet below carries the dimensions, torques, speeds and misalignment limits for all seven; send both shaft diameters and the torque or motor rating for a quotation. Replacement spiders for the GR and GS jaw couplings, and for other jaw couplings already in service, are listed separately under Jaw Coupling Spiders.
V-ring seals in VA and VS profiles, stocked and supplied in Chennai by Raj Trading Corporation. A V-ring is an all rubber axial seal: it stretches onto the shaft, turns with it, and its flexible lip runs against a counterface such as a bearing housing, a washer or a plate. That makes it the seal for keeping dirt, dust, splash water and coolant out of a bearing rather than for holding pressure in, and it tolerates shaft runout and misalignment that a lip seal in a fixed housing will not. It is commonly fitted in front of an oil seal or a bearing as the outboard barrier. The VA profile runs from VA 003 to VA 200, covering shaft seats from 2.5 mm to 180 mm. The VS profile, a heavier section, runs from VS 005 to VS 199, covering 4 mm to 180 mm. Sizes on the list are written as inside diameter, outside diameter and section, for example 45*55*5.5/9, and each carries its own SOG number in the 600000 series for VA and the 610000 series for VS. The size list below carries every part code and dimension for both profiles; send the shaft diameter and the profile, or the part number stamped on the seal coming off, for a quotation.
Open spring vibration isolators, stocked and supplied in Chennai by Raj Trading Corporation, in four series covering 10 kg to 2300 kg per mount. A spring mount is specified on deflection rather than on load alone: these are made in nominal 20 mm, 25 mm and 50 mm deflection at rated load, which is where they isolate low frequency vibration that a bonded rubber mount is too stiff to touch. Springs are colour coded by rated load, so a mount can be identified on site long after its label has gone, and each carries 50 per cent overload capacity. The OSB20 and OSS20 series cover 10 kg to 100 kg at 20 mm deflection; OS25 covers 30 kg to 2300 kg at 25 mm; OS50 covers 100 kg to 1300 kg at 50 mm. Each mount has an expanding rubber cup around the spring for high frequency attenuation, and a base that can be bolted down or left free standing on a 5 mm rubber pad. Typical uses are air handling units, axial and centrifugal fans, low level pipe work, and pumps, generating sets and compressors on inertia bases. The specification sheet below carries every code with its colour, rated load, deflection and mounting dimensions; send the machine weight and the number of mounting points for a quotation.
Hydraulic piston seals, rod seals, backup rings and static seals from Tecnolan and Tecnotex, stocked and supplied in Chennai by Raj Trading Corporation. Ten ranges and just over 400 sizes, in polyurethane and in fabric reinforced nitrile. For the piston: the TTO and TTQ polyurethane glyd rings, 25 mm to 250 mm bore, the PDH compact piston seal in NBR with PTFE and POM, 40 mm to 225 mm, and the TPP inch series from 1.5 in to 5.5 in. For the rod: the BUF buffer seal, the GIP polyurethane rod seal, the TSE and TGO fabric rod seals from 12 mm to 230 mm, and the PSE and PSE/K fabric rod seals with POM up to 300 mm. Then the GKM polyurethane backup rings, 7 mm to 270 mm, and the GDS polyurethane static seals, 17 mm to 300 mm. The size list below gives every part number with its housing dimensions: D for the bore or outside diameter, d for the rod or inside diameter, and H for the groove width. Send the part number, or the bore, rod and groove sizes of the cylinder, for a quotation.
Guide rings, metallic wipers and bronze filled PTFE seals from Tecnolan and Tecnotex, stocked and supplied in Chennai by Raj Trading Corporation. Twelve ranges and over 1,200 sizes. Guide rings carry the side load so the seals do not have to: WRFRPR in green polyester composite with PTFE from 20 mm to 344 mm, WR in green fibre reinforced polyester from 20 mm to 250 mm, and WRB in brown phenolic fabric from 36 mm to 354 mm. The DKBI and AM metallic wipers set a polyurethane lip in a steel case for rods from 14 mm to 190 mm, and the HBY buffer seal in PU with POM covers 40 mm to 190 mm. The PTFE seals, all bronze filled PTFE on a nitrile energiser, run with less friction and stick-slip than rubber or polyurethane: the SPGW and PGPS piston seals, the piston glyd ring from 8 mm to 680 mm bore, the rod step seal from 4 mm to 700 mm, the PWS excluders, and the Roto Glyd rings for rods and pistons that turn as well as stroke. The size list below gives every size with its housing dimensions. Send the range with the groove diameter, width and depth, or the bore and rod sizes of the cylinder, for a quotation.
Polyurethane and nitrile spiders for jaw couplings, stocked and supplied in Chennai by Raj Trading Corporation from the Tecnolan and Tecnotex range. The spider is the flexible element between the two hubs of a jaw coupling: it carries the torque, takes up misalignment and damps shock, and it is the part that wears, so it is replaced on its own while the hubs stay on the shafts. Five types and 90 sizes. GR in red polyurethane, from 30 mm to 318 mm outside diameter, and MT in yellow, from 48 mm to 296 mm, for industrial jaw couplings. SBT in green and in yellow, from 40 mm to 220 mm. GS in red polyurethane, from 20 mm to 160 mm, for backlash free precision couplings on servo and CNC drives. And the H element in black nitrile rubber, H-95 to H-440. The size list below gives each spider with its outside diameter, inside diameter, thickness, petal count and minimum order. Quote the type and size as printed, such as GR-28, or send the outside diameter, thickness and petal count of the worn spider, for a quotation.
Imported series hydraulic seals in polyurethane, stocked and supplied in Chennai by Raj Trading Corporation: a wide range of wipers, U-seals and rod seals for general hydraulic cylinders, with a compact piston seal alongside. Five ranges and 885 sizes. The DHS wiper in green PU covers rods from 11 mm to 250 mm, and the AY wiper runs from 10 mm to 210 mm in metric sizes with an inch series as well. The UHS, UNS, UNR and UNP U-seals are the bulk of the series, from 4 mm to 420 mm in green polyurethane, single acting for rods and pistons, with a U2 rod U-seal at the top of the range. The UR rod seal comes in green and in blue polyurethane from 20 mm to 90 mm, and the DAS compact piston seal in black covers bores from 50 mm to 125 mm. The size list below gives every size with its dimensions, colour and minimum order. Send the profile with the inside diameter, outside diameter and height, or the measurements of the worn seal, for a quotation.
Nitrile O-rings in NBR 70 Shore A, black, stocked and supplied in Chennai by Raj Trading Corporation. 1,719 sizes from 0.74 mm to 658.88 mm inside diameter, across 34 cross-sections from 1 mm to 10 mm, covering the metric series and the inch sizes most hydraulic and pneumatic equipment is built to. Nitrile is the general purpose O-ring rubber: it holds up in mineral oils, hydraulic fluids, greases, water and air, and it is the right ring for most static and slow dynamic seals; for high temperatures, fuels and aggressive chemicals the Viton (FKM) ring is the one to ask for. The size list below gives every size by cross-section, with the page each cross-section starts on listed on its cover. Send the inside diameter and cross-section, or the groove dimensions, for a quotation.
Viton O-rings in FKM 75 Shore A, brown, stocked and supplied in Chennai by Raj Trading Corporation. Fluorocarbon rubber is the O-ring for heat, fuels and chemicals: it runs well above the temperature a nitrile ring will take and holds up in fuels, synthetic oils, many solvents and acids that swell or harden nitrile. 792 sizes from 1 mm to 658.88 mm inside diameter, across 19 cross-sections from 1 mm to 7 mm, and where a size has one the list gives its Tecnoring code and its BS (OR UK) and AS568 (USA) dash number, so a ring can be ordered against any of the three. The size list below gives every size by cross-section, with the page each cross-section starts on listed on its cover. Send the inside diameter and cross-section, or a BS or AS568 number, for a quotation.
X-rings, also called quad rings, in NBR 70 Shore A, black, stocked and supplied in Chennai by Raj Trading Corporation. An X-ring has four lobes where an O-ring is round, so it seals on two lips each side, holds lubricant in the pockets between them, and does not roll or twist in its groove. That makes it the better ring for reciprocating and slow rotary duty, with less friction and a lower breakaway than an O-ring. 376 sizes in the AS568 series, from -011 to -932, 2.85 mm to 658.88 mm inside diameter across 12 cross-sections, each fitting the groove of the O-ring with the same AS568 number. The size list below gives every dash number with its dimensions and minimum order. Send the AS568 number, or the inside diameter and cross-section, for a quotation.
Self-centring bonded seals, also called Dowty seals or Dowty washers, stocked and supplied in Chennai by Raj Trading Corporation. A bonded seal is a steel washer with a rubber ring bonded to its bore: it goes under the head of a banjo bolt, plug or threaded fitting and seals the port where a plain copper or fibre washer would weep, and the rubber lip centres it on the thread as it is tightened. These are NBR 90 on steel, in blue. Fourteen sizes for BSP fittings from 1/8" to 2-1/2", fifteen metric sizes from M5 to M30, and two assorted kit boxes for the workshop, one metric with 123 seals in 12 sizes and one inch with 105 in 6. The size list below gives each seal with its dimensions and minimum order. Send the thread size, for example 1/4" BSP or M14, for a quotation.
Radial shaft oil seals in nitrile rubber, SND and XTO make, stocked and supplied in Chennai by Raj Trading Corporation. An oil seal sits in the housing bore around a rotating shaft and keeps the lubricant in and the dirt out of gearboxes, pumps, motors, axles and bearings. 1,149 sizes from 6 mm to 320 mm shaft and 14 mm to 360 mm outside diameter. The size list below runs in order of outside diameter, and its cover gives the OD span of every page, so measure the housing bore first. Send the shaft diameter, outside diameter and width, for example 35 x 52 x 7, or the numbers moulded on the worn seal, for a quotation.
Rubber and cork friction pads for machine feet: ribbed rubber either side of a cork layer, laid under a machine to stop it walking across the floor and to cut the vibration it passes into it, with no bolting down. Stocked in four square sizes: 4 x 4 x 1 inch (100 x 100 x 25 mm), 6 x 6 x 1 inch (150 x 150 x 25 mm), 9 x 9 x 3/4 inch (225 x 225 x 20 mm) and 9 x 9 x 1 inch (225 x 225 x 27 mm). Used under machine tools, presses, compressors, pumps, generator sets and air conditioning plant. Stocked in Chennai by Raj Trading Corporation. The specification sheet below carries every size; send the size and quantity, or the machine weight and the number of feet, for a quotation.
Grooved rubber pads for machine feet: solid black rubber with a grooved face, laid under a machine to hold it in place on the floor and to cut the vibration it passes into it, with no bolting down. Stocked in six square sizes: 4 x 4 x 1/2 inch (100 x 100 x 12 mm), 4 x 4 x 1 inch (100 x 100 x 25 mm), 6 x 6 x 1/2 inch (150 x 150 x 12 mm), 6 x 6 x 1 inch (150 x 150 x 25 mm), 12 x 12 x 1/2 inch (300 x 300 x 12 mm) and 12 x 12 x 1 inch (300 x 300 x 25 mm). Used under machine tools, presses, compressors, pumps, generator sets and air conditioning plant. Stocked in Chennai by Raj Trading Corporation. The specification sheet below carries every size; send the size and quantity, or the machine weight and the number of feet, for a quotation.
Plain rubber pads: flat solid black rubber, 12 inch (300 mm) square, for laying under machines and equipment where a level, even bearing is wanted, and for cutting packing and pads to shape on site. Stocked in five thicknesses: 12 x 12 x 3/4 inch (300 x 300 x 20 mm), 12 x 12 x 1 inch (300 x 300 x 25 mm), 12 x 12 x 1 1/4 inch (300 x 300 x 30 mm), 12 x 12 x 1 1/2 inch (300 x 300 x 40 mm) and 12 x 12 x 2 inch (300 x 300 x 50 mm). Stocked in Chennai by Raj Trading Corporation. The specification sheet below carries every size; send the size and quantity, or the finished size of a cut piece, for a quotation.
Mechanical shaft seals and seal components for pumps, agitators and rotating equipment, supplied in Chennai by Raj Trading Corporation. Nineteen types: conical, single coil and multi spring seals, balanced and unbalanced, for shafts from 10 mm to 150 mm; PTFE, rubber and welded metal bellow seals, the metal bellow rated to 350 °C; cartridge seals in single and double form; dry running and top entry agitator seals up to 200 mm shaft and 60 bar; ARO, Calico, M6, wave spring and HJ type seals for process and textile pumps; seals for Grundfos pumps, rubber diaphragm seals for dyeing machines, and rotary joints for water, thermic fluid and steam. Faces in carbon, ceramic, silicon carbide and tungsten carbide, with Viton, PTFE, nitrile and EPDM secondary seals. Each type below lists its materials and operating limits. Send the seal type, the shaft diameter and the duty, meaning the fluid, pressure, temperature and speed, for a quotation.
