
Van der Valk 774221 Stainless Steel Hammerhead Bolt Coupling Set M8x20 (Pack Size 10)
774221
Van Der Valk Stainless Steel Hammerhead Bolt Coupling Set M8x20 – For Mounting Micro-Inverters to ValkPro+ Roof Carrier (Pack of 10)
The Van Der Valk M8x20 Hammerhead Bolt Coupling Set is designed for securely mounting micro-inverters to the roof carrier within the ValkPro+ flat roof PV mounting system. This complete set includes a bolt, washer, and lock nut, all made from corrosion-resistant stainless steel, ensuring a reliable and durable connection.
- Micro-Inverter Mounting: Ideal for fixing micro-inverters directly onto the ValkPro+ roof carrier.
- Hammerhead Bolt Design: Allows easy and secure fitting into roof carrier channels for a streamlined installation.
- Stainless Steel Components: Bolt, washer, and lock nut offer excellent corrosion resistance and mechanical strength.
- Complete Coupling Set: Includes M8x20 hammerhead bolt, washer, and lock nut for a ready-to-use solution.
- Pack Size for Efficiency: Supplied in sets of 10 for convenience on-site and system uniformity.
Technical Specification
- Product Type: Hammerhead Bolt Coupling Set
- Material: Stainless Steel
- Bolt Size: M8 x 20mm
- Contents: Bolt, Washer, Lock Nut
- Pack Size: 10 Sets
✅ Mount micro-inverters securely and efficiently with the Van Der Valk M8x20 Hammerhead Bolt Coupling Set – the ideal fit for ValkPro+ roof carriers.

Range | ValkPro+ |
Product | Bolt |
Delivery Options:
- PRIORITY DELIVERY – Next Working Day (All items in stock and ordered before 3 pm) - £7.08 inc-VAT. (£5.90 ex-VAT)
- Orders Over £100 (before VAT): We offer free standard shipping on all orders shipped to UK mainland addresses
- Orders under £100 (before VAT): Our standard delivery fee to UK mainland addresses is £5.90 ex-VAT (£7.08 inc-VAT)
*Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £12 ex-VAT for all orders (Prices subject to change).
Items requiring specialist shipping:
- Orders containing Solar Panels, Batteries and/or Inverters: Up to 50 qty will be dispatched on a pallet and incur a £120 ex-VAT delivery charge**.
**Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £180 ex-VAT (Prices subject to change).
Contact us if you have any further questions.