BK25 THK Ball Screw Support Unit
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Product details
- Quality Premium
- Vendor THK
- SKU BK25-THK
- Inside diameter (d) 25mm
THK square fixed-side support unit for ball screws with a 25 mm bearing journal diameter. The BK25 contains a factory-preloaded P5 angular-contact bearing set in a DF arrangement, providing accurate shaft positioning and high axial rigidity. Its compact housing allows straightforward installation without additional bearing... Read full description ↓ Show less ↑
THK square fixed-side support unit for ball screws with a 25 mm bearing journal diameter.
The BK25 contains a factory-preloaded P5 angular-contact bearing set in a DF arrangement, providing accurate shaft positioning and high axial rigidity. Its compact housing allows straightforward installation without additional bearing adjustment.
The unit is supplied complete with its housing, bearing set, holding lid, collars, seals, lock nut and locking screw.
Product characteristics
Category: Ball screw support units
Manufacturer: THK
Series: BK
Design: Square support unit
Mounting position: Fixed side
Bearing journal diameter: 25 mm
Bearing arrangement: DF angular-contact arrangement
Bearing accuracy: P5
Bearing used: 7205 equivalent
Preload: Factory adjusted
Weight: 2.300 kg
Country of origin: Japan
Main dimensions
Shaft diameter d: 25 mm
Length L: 42 mm
L1: 12 mm
L2: 54 mm
L3: 9 mm
Housing width B: 106 mm
Housing height H: 80 mm
Housing thickness b: 53 mm
Shaft centre height h1: 48 mm ±0.02 mm
B1: 64 mm
H1: 70 mm
E: 33 mm
Mounting-hole pitch P: 85 mm
C1: 22 mm
C2: 10 mm
Square dimension T: 35 mm
Mounting-hole dimensions
Through-hole diameter d1: 11 mm
Counterbore diameter d2: 17.5 mm
Counterbore depth h: 11 mm
Holding-lid thread M: M5
Collar dimensions
Collar outside diameter D: 31.3 mm
Collar thickness t: 9 mm
Load ratings
Basic dynamic axial load rating Ca: 20.2 kN
Static permissible axial load: 11.5 kN
Axial rigidity: 190 N/μm
Components supplied
Housing: 1
Precision bearing set: 1
Holding lid: 1
Collars: 2
Seals: 2
Lock nut: 1
Hexagonal socket-head locking screw with set piece: 1
The BK25 is designed for the fixed end of a ball screw and can be paired with a THK BF25 supported-side unit.
FREE UK Mainland Delivery on Orders of £50 or More (Excluding VAT)
We offer a range of delivery options to suit your requirements. All delivery charges are calculated and displayed at checkout.
UK Delivery Options
Royal Mail Standard — £2.00
For eligible parcels up to 1.5kg. Estimated delivery within 3–5 working days from dispatch. This is an untracked service.
Royal Mail Tracked 48 — £4.00
For eligible parcels up to 3kg. Estimated delivery within 2–3 working days from dispatch, with tracking provided.
Next Working Day – UK Mainland — £8.50
Orders placed before 3.30pm Monday to Friday are normally dispatched the same working day, subject to stock availability. Delivery is typically within 1–2 working days from dispatch.
Next Working Day AM – Pre 12 — £20.00
Priority delivery aiming for arrival before midday on the next working day, subject to carrier availability.
Next Working Day AM – Pre 10.30 — £30.00
Priority delivery aiming for arrival before 10.30am on the next working day, subject to carrier availability.
Free Delivery
Free standard delivery is available on qualifying UK Mainland orders of £50 or more, excluding VAT. Estimated delivery is 3–5 working days.
Excludes Northern Ireland, Scottish Highlands, Scottish Islands and items requiring separate heavy or bulk delivery arrangements.
Northern Ireland
Royal Mail Standard and Tracked 48 are available for eligible parcels.
Our Northern Ireland courier service costs £15.00 for eligible consignments up to 30kg, with estimated delivery within 2–3 working days.
Scottish Highlands and Islands
Additional courier charges may apply to remote Scottish destinations.
- Scottish Islands courier: £25.00, estimated 2–3 working days.
- Scottish Highlands courier: £35.00, estimated 2–3 working days.
Please contact us before ordering if you need confirmation of delivery charges.
Click & Collect — FREE
Collect your order from Bearing King Ltd, Unit 5, Northfield Business Park, Parkgate, Rotherham, S60 1SD.
Please wait until you receive your collection-ready email before travelling.
International Delivery
We ship throughout Europe and worldwide. Available shipping services and charges are calculated at checkout.
Import duties, local taxes and customs clearance charges may apply and are normally the recipient's responsibility.
Important Delivery Information
Orders placed after 3.30pm, at weekends or on bank holidays will normally be processed on the next working day.
Delivery times are estimates rather than guarantees. Carrier delays can occasionally occur, and your statutory rights remain unaffected.
For urgent deliveries, same-day courier enquiries or heavy shipments, please call 01709 527269 or email enquiries@bearing-king.co.uk.
Returns Policy
1. You may return an unused item in new condition unless faulty within 30 days of receipt. Damaged or used goods cannot be refunded.
2. A copy of our returns form must be included with the returned goods.
3. Customers will be responsible for the original and return shipping charges unless our customer service department determines that we are at fault for an order error or product defect. Bearing King will not be responsible for any return item lost in transit.
4. Once we receive the package and the goods are checked, we will refund you by the payment method used when the order was placed.
5. Please allow 3-5 days for your return to be processed or exchange to be sent.