Special Offers
In our special offers section you can find and buy castors and wheels that we currently promoting at a special sale price.These are generally products that we currently have either an excess of stock or new ranges of castors and wheels that we are promoting.
- Display 30 Products per page
- In Stock
200mm Shock Absorbing Fixed Castor, 450kg Capacity | Polyurethane Tyre Wheel, Ball bearing (KGDSP200ARFMUD)
Original price was: £122.49.£65.09Current price is: £65.09. Sale!200mm Shock absorbing (15mm Compression) fixed ... Read Morecastor and Polyurethane Tyred Aluminium Wheel. Load Capacity = 450kg
For the compression performance, please see the image for the curve by clicking on the thumbnail image above. To use this curve, please calculate the weight being carried by this castor and divide that by the one less than the number of castors on your equipment, So if you have a trolley using 4 of these castors and the total weight being carried is 500kg, then the compression of the rubber pad is the reading given on the y axis at 167kg which is just over 10mm.
- In Stock
200mm Shock Absorbing Swivel Castor, 400kg Capacity | Polyurethane Tyre Wheel, Ball bearing (GSST200WSF)
Original price was: £603.79.£232.94Current price is: £232.94. Sale!200mm Shock absorbing Swivel Castor with 30mm comp... Read Moreression. 160x120mm Top Plate with 140/110x105/80mm slotted bolt holes. Polyurethane Tyre with an Aluminium Centre Wheel fitted with Ball Bearing.Power Towable:- Max Load at 10km/h = 500kg
- Max Load at 20km/h = 400kg
- Out of Stock - On the Way
200mm Shock Absorbing Swivel Castor, 450kg Capacity | Polyurethane Tyre Wheel, Ball bearing (KGDSP200ASFMUD)
Original price was: £139.05.£73.89Current price is: £73.89. Sale!200mm Shock absorbing (15mm Compression) Swivel... Read More castor and Polyurethane Tyred Aluminium Wheel. Load Capacity = 450kg
For the compression performance, please see the image for the curve by clicking on the thumbnail image above. To use this curve, please calculate the weight being carried by this castor and divide that by the one less than the number of castors on your equipment, So if you have a trolley using 4 of these castors and the total weight being carried is 500kg, then the compression of the rubber pad is the reading given on the y axis at 167kg (500kg / 3 = 167kg) which is just over 10mm.
- In Stock
200mm Swivel Castor (Powder Coated), 900kg Capacity | Polyurethane Tyre Wheel (KGHP200ASFMUD)
Original price was: £171.85.£99.62Current price is: £99.62. Sale!200mm Heavy-duty Swivel Castor with a Powder Coate... Read Mored Pressed Steel Bracket and a 250mm overall height. The caster wheel has a Blue Polyurethane Tyre (Shore A 95) on an Aluminium Centre with Ball BearingsFeatures:- 900kg Load Capacity: For the most demanding applications and heavy-duty loads.
- Silver/Grey Powder Coating: Making this the best looking heavy-duty industrial castor on the market. The powder-coating not only looks great but also provides corrosion protection which prolongs its optimal performance and keeps the castor looking good.
- Quality Ball Bearings: For the lowest rolling resistance to reduce the effort needed to move.
- Double Ball Bearing Race and hardened bearing Seats in the swivel head: For an optimum swivel rotation function and durability.
- Strong Pressed Steel Plate: The top plate measure 140x110mm with fixing bolt holes slotted to 105x80/75mm to suit 10mm bolts
- Precision Engineered: These castors have an incredibly smooth swivelling function with no "rock" to the swivel head and no sideways movement on the wheel for exceptional operating performance.
- In Stock
200mm Swivel Castor with Brake (Powder Coated), 900kg Capacity | Polyurethane Tyre Wheel (KGHP200BSFMUD)
Original price was: £192.50.£111.60Current price is: £111.60. Sale!200mm Heavy-duty Swivel & Wheel Brake Castor w... Read Moreith a Powder Coated Pressed Steel Bracket and a 250mm overall height. The caster wheel has a Blue Polyurethane Tyre (Shore A 95) on an Aluminium Centre with Ball BearingsFeatures:- 900kg Load Capacity: For the most demanding applications and heavy-duty loads.
- Silver/Grey Powder Coating: Making this the best looking heavy-duty industrial castor on the market. The powder-coating not only looks great but also provides corrosion protection which prolongs its optimal performance and keeps the castor looking good.
- Total Stop Brake System: Applying the brake pedal simultaneously locks both the wheel and the swivel rotation.
- Quality Ball Bearings: For the lowest rolling resistance to reduce the effort needed to move.
- Double Ball Bearing Race and hardened bearing Seats in the swivel head: For an optimum swivel rotation function and durability.
- Strong Pressed Steel Plate: The top plate measure 140x110mm with fixing bolt holes slotted to 105x80/75mm to suit 10mm bolts
- Precision Engineered: These castors have an incredibly smooth swivelling function with no "rock" to the swivel head and no sideways movement on the wheel for exceptional operating performance.
- In Stock
200mm Swivel Castor with Brake, 250kg Capacity | Polypropylene Wheel, Plain Bore (LSV200PPBR)
Original price was: £18.03.£16.92Current price is: £16.92. Sale!200mm Top Plate swivel and Brake Castor with a Whi... Read Morete Polypropylene wheel. It has 105x80mm fixing bolt hole centres, 235mm overall height and the load capacity is 250kg using manual propulsion at 4km/h.This is one of our most popular castors and the White Polypropylene wheel is non-marking and won’t damage concrete floors. Because it is a hard tread it has the lowest rolling and swivelling resistance. It is ideal as a new component or a replacement caster for most general purpose domestic or industrial castor where the travel speed of the castor generally does not exceed walking speed. - In Stock
50mm Footmaster Castor with Levelling Foot, 150kg Capacity | Nylon Wheel, Plain Bore (KGDH50ASFNYN)
Original price was: £35.45.£27.35Current price is: £27.35. Sale!This 50mm Swivel Castor has Black Nylon wheel (pla... Read Morein bore) with an extra long adjustable foot (GDH-50-ASF-NYN). The aluminium castor frame has a durable ivory coloured powder coating for protection against wear and tear.The Threaded section of the Adjustable Foot extends a maximum of 56mm above the top of the top plate (64mm including the hex head). The Hex Head can be operated by a drill for quick operation.The overall height of the castor is 73mm and the adjustable foot can extend by up to 35mm to enable precise levelling.The load capacity of this product is 150kg and the recommended maximum total load over 4 castors is 450kg. - In Stock
50mm Furniture Castor, 50kg Capacity | Wheel (44-PAIR)
Original price was: £16.12.£15.12Current price is: £15.12. Sale!Sold in Pack o... Read Moref 2 with 1 Left Hand castor and 1 Right Hand castor
50mm Shepherd Castor with M8x16mm Threaded Stem. Standard Metal Tread Wheel. Load Capacity = 50kg. This pack of 2 castors comes with 1 Left Hand and 1 Right Hand Ball Type Castor.
These casters should be fitted diagonally opposite each other.
- In Stock
50mm Furniture Swivel Castor, 50kg Capacity | Metal Tread Wheel (46PAIR)
Original price was: £10.90.£10.22Current price is: £10.22. Sale!Sold in Pack o... Read Moref 2 with 1 Left Hand castor and 1 Right Hand castor
50mm Shepherd Castor with 9.5mm x 32mm Peg and Socket (8mm Circlip Stem). Ball type castors with standard metal tread wheel. Load Capacity = 50kg. This pack of 2 castors comes with 1 Left Hand and 1 Right Hand Ball Type Castor.
These casters should be fitted diagonally opposite each other.
- In Stock
50mm Low Level Swivel Castor, 160kg Capacity | Nylon Wheel, Plain Bore (2SL050NY0L)
Original price was: £18.51.£14.90Current price is: £14.90. Sale!50mm Low Level Twin Wheel Swivel Castor (REVVO Bra... Read Morend) with round top plate. The Nylon Wheels have a tread width of 14mm each and turn on a smooth Plain Bore. The Load Capacity of this castor is 160kg.This castors offers an exceptional load capacity in relation to their low overall working height and is ideal for heavy equipment being used on smooth, hard flooring. The differential action from the twin wheels makes for smooth operation.This castor has a round top plate with a diameter of 95mm and 4 fixing holes to suit a 6mm bolt. Each fixing hole is spaced 51mm from the directly opposite fixing hole (the largest distance between the fixing holes) - In Stock
50mm Low Level Swivel Castor, 160kg Capacity | Nylon Wheel, Plain Bore (MSTW050NY)
Original price was: £14.20.£9.94Current price is: £9.94. Sale!50mm Twin Wheel Swivel Castor with Round Top Plate... Read More (Keystone) with a 64mm overall height and 160kg load rating. The Nylon Wheels have a tread width of 14mm each and with a smooth Plain Bore.The round top plate has a diameter of 95mm and 4 fixing holes to suit 6mm bolts. Each fixing hole is spaced 51mm from the fixing hole diagonally opposite (the largest distance between the fixing holes)This castor offers an exceptional load capacity in relation to its low overall working height and is ideal for heavy equipment being used on smooth, hard flooring. The differential action from the twin wheels makes for smooth operation. - In Stock
50mm Low Level Swivel Castor, 160kg Capacity | Polyurethane Tyre Wheel, Plain Bore (2SL050PT0L)
Original price was: £26.21.£24.59Current price is: £24.59. Sale!50mm Low Level Twin Wheel Swivel Castor (REVVO Bra... Read Morend). The Polyurethane tyre wheels have a tread width of 14mm each and turn on a smooth Plain Bore. The Load Capacity of 160kg.This castors offers an exceptional load capacity in relation to their low overall working height and is ideal for heavy equipment being used on smooth, hard flooring. The differential action from the twin wheels makes for smooth operation.This castor has a round top plate with a diameter of 95mm and 4 fixing holes to suit a 6mm bolt. Each fixing hole is spaced 51mm from the directly opposite fixing hole (the largest distance between the fixing holes) - In Stock
50mm Shock Absorbing Fixed & Brake Castor, 40kg Capacity | Polyurethane Tyre Wheel (GDS050B65RF)
Original price was: £51.07.£34.54Current price is: £34.54. Sale!50mm Shock absorbing Fixed Castor with a Brake. Th... Read Moree top plate measures 55x55mm with 42x42mm fixing bolt holes centres to suit 6mm fixing bolts. The wheel as a soft (Shore 80A) polyurethane tyre for high elasticity and is fitted with a precision ball bearing. This castor has as load capacity of 40kg.The brake locks the wheel only allowing the swivel head to rotate freely when applied. The Top Plate is made from pressed steel and the frame is aluminium. The parts have powder coated and zinc plated for protectionThe shock absorbing functions means that the overall height can vary by 10mm. The castor's height without load is 100mm and this reduces incrementally by up to 10mm as the load increases providing up t0 10mm of compression for a fine shock absorbing function. - In Stock
50mm Shock Absorbing Fixed Castor, 40kg Capacity | Polyurethane Tyre Wheel (GDS05065RF)
Original price was: £45.40.£28.51Current price is: £28.51. Sale!50mm Shock absorbing Fixed Castor with Top plate m... Read Moreeasuring 55x55mm and 42x42mm fixing bolt holes centres to suit 6mm fixing bolts. The wheel as a soft (Shore 80A) polyurethane tyre for high elasticity and is fitted with a precision ball bearing. This castor has as load capacity of 40kg.The Top Plate is made from pressed steel and the frame is aluminium. The parts have powder coated and zinc plated for protectionThe shock absorbing functions means that the overall height can vary by 10mm. The castor's height without load is 100mm and this reduces incrementally by up to 10mm as the load increases providing up t0 10mm of compression for a fine shock absorbing function. - In Stock
50mm Shock Absorbing Swivel & Brake Castor, 40kg Capacity | Polyurethane Tyre Wheel (GDS050B65SF)
Original price was: £53.92.£33.86Current price is: £33.86. Sale!50mm Shock absorbing Swivel Castor with Brake. The... Read More Top plate measures 55x55mm and has 42x42mm fixing bolt holes centres to suit 6mm fixing bolts. The wheel as a soft (Shore 80A) polyurethane tyre for high elasticity and is fitted with a precision ball bearing. This castor has as load capacity of 40kg.The brake locks the wheel only allowing the swivel head to rotate freely.The Top Plate is made from pressed steel and has a double ball race with hardened bearing seats in the swivel head for smooth swivel rotation. The frame is aluminium. The parts have powder coated and zinc plated for protection.The shock absorbing functions means that the overall height can vary by 10mm. The castor's height without load is 100mm and this reduces incrementally by up to 10mm as the load increases providing up t0 10mm of compression for a fine shock absorbing function. - In Stock
50mm Shock Absorbing Swivel Castor, 40kg Capacity | Polyurethane Tyre Wheel (GDS05065SF)
Original price was: £48.24.£30.30Current price is: £30.30. Sale!50mm Shock absorbing Swivel Castor with Top plate ... Read Moremeasuring 55x55mm and 42x42mm fixing bolt holes centres to suit 6mm fixing bolts. The wheel as a soft (Shore 80A) polyurethane tyre for high elasticity and is fitted with a precision ball bearing. This castor has as load capacity of 40kg.The Top Plate is made from pressed steel and has a double ball race with hardened bearing seats in the swivel head for smooth swivel rotation. The frame is aluminium. The parts have powder coated and zinc plated for protection and keeps your castors looking newer for longer.The shock absorbing functions means that the overall height can vary by 10mm. The castor's height without load is 100mm and this reduces incrementally by up to 10mm as the load increases providing up t0 10mm of compression for a fine shock absorbing function. - In Stock
50mm Stainless Steel Footmaster Levelling Castor, 280kg Capacity | Nylon Wheel, Plain Bore (KSGDN-60F)
Original price was: £148.64.£104.05Current price is: £104.05. Sale!50mm Stainless Steel Footmaster levelling castor h... Read Moreas a stainless steel forged steel plate and castor frame. This castor has a Top Plate Fitting and 280kg Static and 140kg Dynamic Load Capacity. Machine Cast Nylon Wheel With Vibration Damping Rubber Pad. Nylon Handwheel height adjustment operation. The overall height is 82mm when the wheel is engaged with a total lift of up to 15mm using the rubber footpad.This stainless steel Footmaster Levelling castor has a double ball bearing with hardened stainless steel bearings in the swivel head and has completely corrosion-resistant components applied.Footmaster levelling castors are a multi-functional swivel castor that provides mobility, levelling and anti-vibration functions. This allows users to move and position large equipment into place.Because of the lifting and lowering function, like regular Jacking Castors, it is important understand that each castor may be subjected to HALF THE TOTAL WEIGHT. Therefore, the recommended load for each Footmaster Castor is half the castor's Static Load Capacity of when the castor is stationary and the foot-pads are lowered.This load capacity of the Footmaster Castor when being moved and positioned is given by the Dynamic Load Capacity. - In Stock
50mm Stainless Steel Footmaster Levelling Castor, 280kg Capacity | Nylon Wheel, Plain Bore (KSGDN-60S)
Original price was: £140.79.£98.56Current price is: £98.56. Sale!50mm Footmaster castor with Stainless forged steel... Read More plate and stainless casting frame, M12 x 18mm Threaded Stem Fitting. 280kg Static and 140kg Dynamic Load Capacity with Machine Cast Nylon Wheel and Vibration Damping Rubber Pad. Nylon Handwheel height adjustment Operation. This footmaster castor has an overall height of 82mm when the wheel is engaged with a total lift of 15mm using the rubber footpad.The version of the Footmaster Levelling castor has a double ball bearing with hardened stainless steel bearings in the swivel head. The KSGDN Footmaster castor has completely corrosion-resistant components applied.The Footmaster levelling castor is a multi-functional swivel castor that provides mobility, levelling and anti-vibration functions. This allows users to move and position large equipment into place.Because of the lifting and lowering function of the Footmaster castor, like regular Jacking Castors, it is important understand that each castor may be subjected to HALF THE TOTAL WEIGHT. Therefore, the recommended load for each Footmaster Castor is half the castor's Static Load Capacity of when the castor is stationary and the foot-pads are lowered.This load capacity of the Footmaster Castor when being moved and positioned is given by the Dynamic Load Capacity. - In Stock
60mm Furniture Castor with Brake, 60kg Capacity | Polypropylene Wheel (TW60TSB)
Original price was: £2.12.£1.24Current price is: £1.24. Sale!60mm Twin Wheel Furniture Castor with brake and M1... Read More0x20mm Threaded Stem. Black Polypropylene Wheels. Load Capacity = 60kg.This castor is an excellent choice for furniture, display equipment / stands and other light duty indoor applications. - In Stock
60mm Furniture Swivel Castor, 60kg Capacity | Polypropylene Wheel (TW60TS)
Original price was: £1.64.£1.11Current price is: £1.11. Sale!60mm Twin Wheel Furniture Swivel Castor with M10x2... Read More0mm Threaded Stem. Black Polypropylene Wheels. Load Capacity = 60kg.This castor is an excellent choice for furniture, display equipment / stands and other light duty indoor applications. - In Stock
60mm Twin Wheel Swivel Castor | Polyurethane Tyre Wheel, Ball Bearing, 150kg Capacity (GAJSD60ASFHUD)
Original price was: £139.12.£67.21Current price is: £67.21. Sale!60mm Swivel Castor with Dual Polyurethane ... Read MoreTyres for AGVsMaximize your AGV’s performance with our high-quality Automated Guided Vehicle Castors. This 70mm swivel castor features dual (twin) polyurethane tyres mounted on durable aluminium centres, complemented by precision ball bearings. Designed to meet the high demands of AGV applications, this castor ensures smooth, efficient, and reliable operation in industrial settings.The black powder-coated bracket offers superior protection compared to standard zinc-plated frames, enhancing durability in harsh environments. Its low overall height of just 87mm makes it ideal for compact AGV systems, ensuring stability without compromising load capacity—supporting up to 150kg (450kg over 4 castors).Key Specifications:
- Top Plate Fixing: 86x61mm bolt hole spacing with 9mm drilled holes, suited for 8mm bolts.
- Dual Polyurethane Tyres: 95 Shore A hardness for low tractive resistance, smooth and quiet operation.
- Non-Marking Tyres: Protects floors and reduces maintenance costs.
- Robust Swivel Bracket: Double ball race swivel head for enhanced manoeuvrability and durability.
Benefits:
- Optimized for AGVs: Engineered for automated guided vehicles, ensuring reliable, continuous performance.
- Smooth, Quiet Operation: Polyurethane tyres reduce rolling resistance and noise, enhancing efficiency.
- Long-Lasting Durability: Strong aluminium centres and black powder-coated brackets for extended lifespan.
- In Stock
63mm Fixed Castor, 122kg Capacity | 63mm Nylon Wheel, Plain Bore (288NY)
Original price was: £4.27.£2.71Current price is: £2.71. Sale!63mm Top Plate Fixed Castor (Pressed Steel) with 7... Read More6x35 Hole Centres. Nylon Wheel with Plain Bore. Load Capacity = 122kg - In Stock
63mm Footmaster Castor with Levelling Foot, 500kg Capacity | 63mm Nylon Wheel, Plain Bore (KGDH65ASFNYN)
Original price was: £67.01.£39.75Current price is: £39.75. Sale!This 63mm Swivel Castor has Black Nylon wheel (pla... Read Morein bore) with an extra long adjustable foot (GDH-65-ASF-NYN). The aluminium castor frame has a durable ivory coloured powder coating for protection against wear and tear.The Threaded section of the Adjustable Foot extends a maximum of 60mm above the top of the top plate (78mm including the hex head). The Hex Head can be operated by a drill for quick operation.The overall height of the castor is 98mm and the adjustable foot can extend by up to 48mm to enable precise levelling.The load capacity is 500kg and the recommended maximum total load to be carried by 4 castors is 1,500kg. - In Stock
63mm Footmaster Castor with Levelling Foot, 500kg Capacity | 63mm Nylon Wheel, Plain Bore (KGDL65ASFNYN)
Original price was: £65.23.£39.74Current price is: £39.74. Sale!This 63mm Heavy Duty Levelling Castor with a Black... Read More Nylon wheel (Ball Bearing) and adjustable foot (GDL-65-ASF-NYN). This castor is a swivel castor with a load capacity of 500kg. The aluminium castor frame has a durable ivory coloured powder coating for protection against wear and tear.The overall height of the castor is 98mm and the adjustable foot can extend by up to 18mm to enable precise levelling.The load capacity of this product is 500kg and the recommended maximum total load over 4 castors is 1,500kg. - In Stock
63mm Footmaster Levelling Castor, 550kg Capacity | 63mm Nylon Wheel, Plain Bore (KSGDN-80F)
Original price was: £226.21.£158.35Current price is: £158.35. Sale!63mm Footmaster castor with stainless forged steel... Read More plate and stainless steel casting frame - Top Plate Fitting. 550kg Static and 275kg Dynamic Load Capacity. Machine Cast Nylon Wheel With Vibration Damping Rubber Pad. Nylon Handwheel height adjustment operation. This footmaster castor has an overall height of 103mm when the wheel is engaged with a total lift of 15mm using the rubber footpad.The version of the Footmaster Levelling castor has a double ball bearing with hardened stainless steel bearings in the swivel head. The KSGDN Footmaster castor has completely corrosion-resistant components applied.The Footmaster levelling castor is a multi-functional swivel castor that provides mobility, levelling and anti-vibration functions. This allows users to move and position large equipment into place.Because of the lifting and lowering function of the Footmaster castor, like regular Jacking Castors, it is important understand that each castor may be subjected to HALF THE TOTAL WEIGHT. Therefore, the recommended load for each Footmaster Castor is half the castor's Static Load Capacity of when the castor is stationary and the foot-pads are lowered.This load capacity of the Footmaster Castor when being moved and positioned is given by the Dynamic Load Capacity. - In Stock
63mm Stainless Steel Footmaster Levelling Castor, 550kg Load Capacity (KSGDN-80S)
Original price was: £226.21.£158.35Current price is: £158.35. Sale!63mm Footmaster castor with Stainless forged steel... Read More plate and stainless casting frame, M12 x 18mm Threaded Stem Fitting. 550kg Static Load and 275kg Dynamic Capacity with Machine Cast Nylon Wheel and Vibration Damping Rubber Pad. Nylon Handwheel height adjustment Operation. This footmaster castor has an overall height of 103mm when the wheel is engaged with a total lift of 15mm using the rubber footpad.The version of the Footmaster Levelling castor has a double ball bearing with hardened stainless steel bearings in the swivel head. The KSGDN Footmaster castor has completely corrosion-resistant components applied.The Footmaster levelling castor is a multi-functional swivel castor that provides mobility, levelling and anti-vibration functions. This allows users to move and position large equipment into place.Because of the lifting and lowering function of the Footmaster castor, like regular Jacking Castors, it is important understand that each castor may be subjected to HALF THE TOTAL WEIGHT. Therefore, the recommended load for each Footmaster Castor is half the castor's Static Load Capacity of when the castor is stationary and the foot-pads are lowered.This load capacity of the Footmaster Castor when being moved and positioned is given by the Dynamic Load Capacity. - In Stock
63mm Swivel Castor, 60kg Capacity | 63mm Rubber Tyre Wheel, Plain Bore (261RNST)
Original price was: £12.31.£9.46Current price is: £9.46. Sale!63mm Threaded Stem Fitting Swivel Castor (Pressed ... Read MoreSteel) with M12x25mm Threaded Stem and an overall height of 81mm. The wheel has a Blue Elastic Rubber Tyre with a Black Nylon Centre, 25mm Tread Width and a Smooth Plain Bore. Load Capacity = 60kg.Elastic Blue Rubber tyres are stronger than standard natural rubber. It has a soft tread and is both gentle on floors and non-marking while absorbing fine vibrations when moving which provides user comfort and limits noise. - In Stock
650mm Heavy Duty Turntable , 1500kg Load Capacity (650L)
Original price was: £584.57.£455.62Current price is: £455.62. Sale!650mm Diameter Turntable for fitting to trailers a... Read Morend agricultural vehicles - The Turntable is supplied un-drilled.Connecting the "A" frame with the trailer chassis they allow a full swivel action at speeds of up to 15 mph and the Axial Load rating is 1500 kg. - In Stock
65mm Shock Absorbing Fixed Brake Castor, 50kg Capacity | Polyurethane Tyre Wheel (GDS065B65RF)
Original price was: £54.68.£39.62Current price is: £39.62. Sale!65mm Shock absorbing Fixed Castor with Wheel Brake... Read More and a Top plate measuring 55x55mm with 42x42mm fixing bolt holes centres to suit 6mm fixing bolts. The wheel as a soft (Shore 80A) polyurethane tyre for high elasticity and is fitted with a precision ball bearing. This castor has as load capacity of 50kg.The brake locks only the wheel and allows the swivel head to rotate freely when the brake is applied. The Top Plate is made from pressed steel and the frame is aluminium. The parts have powder coated and zinc plated for protectionThe shock absorbing functions means that the overall height can vary by 10mm. The castor's height without load is 115mm and this reduces incrementally by up to 10mm as the load increases providing up t0 10mm of compression for a fine shock absorbing function.