The Castle TC1 Hidden Locking Fastener is a game-changer for creating sleek, seamless decking. Designed for use with Castle composite decking, this fastener eliminates the need for visible screws or nails, giving your deck a polished, professional appearance. Its clever design locks the boards tightly in place while ensuring even spacing for a flawless finish.

As part of a three-fastener system that includes the Control Expansion & Contraction (CEC) Fastener, the TC1 plays a vital role in managing the natural movement of decking boards. This system prevents warping or distortion by controlling how boards expand and contract over time, adding to the longevity and durability of your deck. Built for strength, ease of use, and long-lasting performance, the Castle TC1 Hidden Locking Fastener is a must-have for both DIY enthusiasts and professional installers.

Key Features:

  • Part of a three-fastener system
  • Works with the Control Expansion & Contraction (CEC) Fastener
  • Designed for uniform spacing and stability
  • Strong, durable, and easy to install
  • Secures decking boards with no visible screws or nails

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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Castle TC1 hidden Fastener clip

for Ultra Guard Composite Decking Boards
  • £0.60 inc. VAT
  • (Delivery from £185.00 inc. VAT )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Thursday 15th October? Order within 1 day, 46 minutes