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K2 Pitched Roof Systems


K2 pitched-roof mounting systems are built for installers who want fast fitting, secure connections, and a clean finish across a wide range of roof types. From compact rail solutions for tile roofs to robust rails for larger arrays, K2’s modular approach makes it easy to choose the right system for the roof structure, loading requirements, and installation style.

  • Insertion System – Best for tile roofs, corrugated fibre cement, corrugated sheet metal, and trapezoidal sheet metal when you want a sleek, low-profile finish and fast installs (no standard module clamps). 
  • MiniRail System – Best for trapezoidal sheet metal roofs. Short-rail solution designed to reduce components and speed up installs, ideal where full-length rails aren’t needed.
  • MultiRail System – Best for trapezoidal sheet metal and corrugated sheet metal roofs. Flexible short-rail platform for versatile roof layouts, balancing speed and adjustability.
  • SingleRail System – Best for pantiles, corrugated roofs (metal or fibre cement via hanger bolts), and standing seam metal roofs (via seam clamps). Classic single-layer rail setup for straightforward installs and broad compatibility.
  • SolidRail System – Best “cover-most-roofs” option: suitable for pan tiles, plain tiles, slate, plus trapezoidal and corrugated metal, corrugated fibre cement, and standing seam (using the appropriate roof attachments). Heavy-duty rail option for higher loads and larger spans, often chosen for bigger arrays or tougher site conditions.
  • BasicRail System – Best for trapezoidal sheet metal roofs; it’s a floating rail concept (BasicLock) designed to manage thermal expansion. Cost-effective rail solution for standard pitched-roof PV builds with reliable performance.
  • CrossHook / CrossRail CrossHook – A flexible rail system compatible with tile and standing seam roofs via the relevant roof attachments. The system is useful on uneven roofs or when optimising rail positioning.


[2004611] K2 End Clamp XS Set 30mm 444 In Stock
K2 End Clamp XS Set 30mm
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K2 End Clamp XS Set 30mm


Black anodised module end clamp set for fixing solar modules with frame heights of 30 mm. Not compatible with the K2 Dome 6 system.

Material: Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Width: 33.7mm
  • Height: 58mm
  • Depth: 65mm
[2004621] K2 End Clamp XS Set Black 30mm 1306 In Stock
K2 End Clamp XS Set Black 30mm
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K2 End Clamp XS Set Black 30mm


Black anodised module end clamp set for fixing solar modules with frame heights of 30 mm. Not compatible with the K2 Dome 6 system. 

Material: Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Black anodised
  • Width: 33.7mm
  • Height: 58mm
  • Depth: 65mm

 

[2004622] K2 End Clamp XS Set Black 35mm Check Availability
K2 End Clamp XS Set Black 35mm
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K2 End Clamp XS Set Black 35mm


Black anodised module end clamp set for fixing solar modules with frame heights of 35 mm. Not compatible with the K2 Dome 6 system. 

Material: Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Black anodised
  • Width: 33.7mm
  • Height: 63mm
  • Depth: 65mm

 

[1004765] K2 EndCap for SolidRail Light 370 In Stock
K2 EndCap for SolidRail Light
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K2 EndCap for SolidRail Light


End caps for K2 SolidRail Light.

Material: glass fibre reinforced polyamide.


Also available in a box of 100 units.

[1004766] K2 EndCap for SolidRail Medium 131 In Stock
K2 EndCap for SolidRail Medium
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K2 End Cap for SolidRail Medium


K2 End Cap for K2 SolidRail Medium
Material: glass fibre reinforced polyamide


Also available in a box of 100 units.

[2001731] K2 Flat Head Screw M8x40 mm 61 In Stock
K2 Flat Head Screw M8x40 mm
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K2 Flat Head Screw M8x40 mm


Hexagon socket head cap screw DIN 912EN ISO 4762.

  • Dimensions: M8x 40mm, serrated underhead
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2000125] K2 HangerBolt M12x300 Set 197 In Stock
K2 HangerBolt M12x300 Set
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K2 HangerBolt M12-300 Set


For fastening the K2 SolidRail and SingleRail mounting rails on roofs with corrugated fiber cement or sheet metal on timber substructures. The K2 hanger bolts are equipped with an extra-long metric thread for installation height adjustment. Hanger bolts are outfitted with a pre-mounted adapter plate.


The set consists of:

  • 1 hangerscrew
  • 3 Collar nut with riffle, Stainless steel
  • 1 Rubber seal, EPDM
  • 1 Washer, Stainless steel
  • 1 Adapter plate with long slot 11 x 39 mm, Stainless steel


Also available in a box of 100 units.


Available to order within 3-5 working days. Contact sales on 020 3763 7000 or at sales@alternergy.co.uk.

[1000093] K2 Hexagonal socket head cap screw M10x20mm 813 In Stock
K2 Hexagonal socket head cap screw M10x20mm
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K2 Hexagonal socket head cap screw M10x20mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M10x 20
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 100 units.

[2001730] K2 Hexagonal socket head cap screw M8 x 30 mm 447 In Stock
K2 Hexagonal socket head cap screw M8 x 30 mm
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K2 Hexagonal socket head cap screw M8x30mm


Bolts with serrated under head according DIN 912/ EN ISO 4762

  • Dimensions: M8x 30mm
  • Material: Stainless steel A2
  • WS 6mm
[2001735] K2 Hexagonal socket head cap screw M8x16mm 300 In Stock
K2 Hexagonal socket head cap screw M8x16mm
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K2 Hexagonal socket head cap screw M8x16mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x 16
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2001729] K2 Hexagonal socket head cap screw M8x20mm 575 In Stock
K2 Hexagonal socket head cap screw M8x20mm
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K2 Hexagonal socket head cap screw M8x20mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x 20
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2001732] K2 Hexagonal socket head cap screw M8x25mm 419 In Stock
K2 Hexagonal socket head cap screw M8x25mm
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K2 Hexagonal socket head cap screw M8x25mm


Hexagon socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x25
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2001728] K2 Hexagonal socket head cap screw M8x35mm 843 In Stock
K2 Hexagonal socket head cap screw M8x35mm
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K2 Hexagonal socket head cap screw M8x35mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x 35
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2002179] K2 Hexagonal socket head cap screw M8x50mm 737 In Stock
K2 Hexagonal socket head cap screw M8x50mm
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K2 Hexagonal socket head cap screw M8x50mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x 50
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2001734] K2 Hexagonal socket head cap screw M8x60mm Check Availability
K2 Hexagonal socket head cap screw M8x60mm
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K2 Hexagonal socket head cap screw M8x60mm


Hexagon. socket head cap screw DIN 912EN ISO 4762

  • Dimensions: M8x 60
  • Drive: six lobe (Imbus) SW 6
  • Material: Stainless steel


Also available in a box of 200 units.

[2002767] K2 Insertion Rail Cable Clip, 8 cm Check Availability
K2 Insertion Rail Cable Clip, 8 cm
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K2 Insertrtion Rail Cable Clip, 8 cm


Plastic profile to hold the DC wiring in the K2 Insertion Rail system.


Material: Polycarbonate

[2002765] K2 Insertion Rail Connector, BLACK Check Availability
K2 Insertion Rail Connector, BLACK
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K2 Insertion Rail Connector, Black


Rail connector for quick and easy connection of two K2 Insertion Rails

Material: Aluminium EN AW-6063 T66

[2002761] K2 Insertion Rail End Stop Set, BLACK Check Availability
K2 Insertion Rail End Stop Set, BLACK
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K2 Insertion Rail End Stop Set, Black


End angle for K2 Insertion Rail. Incl. fitted grub screw M6

Material: aluminium [AIMgSi0.5 F22]

[2002766] K2 Insertion Rail Fix Stop Set Check Availability
K2 Insertion Rail Fix Stop Set
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K2 Insertion Rail Fix Stop Set


K2 side stop to hold the insertion rail in place and prevent lateral protrusion. Incl. fitted grub screw M8

Material: Aluminium [AIMgSi0.5 F22]

[2004086] K2 InsertionRail 30; 5.40 m Black Check Availability
K2 InsertionRail 30; 5.40 m Black
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K2 InsertionRail 30; 5.40 m Black


Insertion rail with static confirmation in K2 Base to mount solar modules with a frame height of 30 mm. Material: Aluminium EN AW-6063 T66


FEATURES:

  • Height [mm]: 45.7
  • Length [m]: 5.40
  • Width [mm]: 54
  • Module frame height [mm]: 30
  • Mounting systems: K2 InsertionRail
  • Surface: Black anodised
[2004085] K2 InsertionRail 30; 5.40 m Silver Check Availability
K2 InsertionRail 30; 5.40 m Silver
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K2 InsertionRail 30; 5.40 m Silver


Insertion rail with static confirmation in K2 Base to mount solar modules with a frame height of 30 mm. Material: Aluminium EN AW-6063 T66

FEATURES:

  • Height [mm]: 45.7
  • Length [m]: 5.40
  • Width [mm]: 54
  • Module frame height [mm]: 30
  • Mounting systems: K2 InsertionRail
  • Surface: Aluminium mill
[2004217] K2 InsertionRail 35; 5.40 m Black Check Availability
K2 InsertionRail 35; 5.40 m Black
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K2 InsertionRail 35; 5.40 m Black


Insertion rail with static confirmation in K2 Base to mount solar modules with a frame height of 35 mm. Material: Aluminium EN AW-6063 T66

FEATURES:

  • Height [mm]: 50.70
  • Length [m]: 5.40
  • Width [mm]: 54
  • Module frame height [mm]: 35
  • Mounting systems: K2 InsertionRail
  • Surface: Black anodised
[2004216] K2 InsertionRail 35; 5.40 m Silver Check Availability
K2 InsertionRail 35; 5.40 m Silver
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K2 InsertionRail 35; 5.40 m Silver


Insertion rail with static confirmation in K2 Base to mount solar modules with a frame height of 35 mm. Material: Aluminium EN AW-6063 T66

FEATURES:

  • Height [mm]: 50.70
  • Length [m]: 5.40
  • Width [mm]: 54
  • Module frame height [mm]: 35
  • Mounting systems: K2 InsertionRail
  • Surface: Aluminium mill
[1000473] K2 Locking Washer, M8 (Pack of 100) 2 In Stock
K2 Locking Washer, M8 (Pack of 100)
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K2 Locking Washer, M8 (Pack of 100)


FEATURES:

  • Pack of 100 units
  • Locking washer for bolted connections DIN EN 10151
  • Dimensions: S8; 8.4 x 13 x 0.8 mm
  • Stainless steel A2
  • Warranty: 12 years
  • Certificates: EN, CE


Also available in a box of 200 units.

[1005156] K2 Mid Clamp XS Set 30-33mm 1 In Stock
K2 Mid Clamp XS Set 30-33mm
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K2 Mid Clamp XS Set 30-33mm


For mounting of modules with module frame depths of 30 - 33 mmto be used with S-Dome 2.0 and D-Dome 2.0.

The set is preassembled and can be easily mounted with every K2 rail. M K2 insertnuts are self-locking and can be moved by applying light pressure to the stainless steel screw in the rail.


Middle clamp XS set, consisting of:

  • 1 aluminium middle clamp XS, cold pressed
  • 1 stainless steel socket screw (M8x50)
  • 1 M K2 insert nut M8, stainless steel
  • 1 securing washer S8. stainless steel


Also available in a box of 200 units.

[2004609] K2 Mid Clamp XS Set 30mm 632 In Stock
K2 Mid Clamp XS Set 30mm
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K2 Mid Clamp XS Set 30mm


For Module centre clamps XS Set for fixing solar modules with frame heights of 30 mm. Not compatible with the K2 Dome 6 system.

Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Width: 32.5mm
  • Height: 58mm
  • Depth: 65mm

 

[2004610] K2 Mid Clamp XS Set 33-35mm Check Availability
K2 Mid Clamp XS Set 33-35mm
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K2 Mid Clamp XS Set 33-35mm


For Module centre clamps XS Set for fixing solar modules with frame heights of 33-35 mm. Not compatible with the K2 Dome 6 system.

Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Width: 32.5mm
  • Height: 63mm
  • Depth: 65mm

 

[2004619] K2 Mid Clamp XS Set Black 30mm 383 In Stock
K2 Mid Clamp XS Set Black 30mm
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K2 Mid Clamp XS Set Black 30mm


For Module centre clamps XS Set for fixing solar modules with frame heights of 30 mm. Not compatible with the K2 Dome 6 system.

Material: Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Black anodised
  • Width: 32.5mm
  • Height: 58mm
  • Depth: 65mm

 

[2004620] K2 Mid Clamp XS Set Black 33-35mm Check Availability
K2 Mid Clamp XS Set Black 33-35mm
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K2 Mid Clamp XS Set Black 33-35mm


For Module centre clamps XS Set for fixing solar modules with frame heights of 33-35 mm. Not compatible with the K2 Dome 6 system.

Material: Aluminium EN AW 6063 T66, stainless steel, TPE/PA.

  • Black Anodised
  • Width: 32.5mm
  • Height: 63mm
  • Depth: 65mm

 

[2004213] K2 MiniFive MK2 End 41 In Stock
K2 MiniFive MK2 End
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K2 MiniFive MK2 End


Additional adapter as module support for the MiniRail MK2 System with an inclination of 5° for improved rear ventilation.


FEATURES:

  • Width = 90 mm
  • Height = 186.5 mm
  • Inclination of 5°
  • Material: EN AW-6063 T66


Also available in a box of 20 units.

[2004212] K2 MiniFive MK2 Front 21 In Stock
K2 MiniFive MK2 Front
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K2 MiniFive MK2 Front


Additional adapter as module support for the MiniRail MK2 System with an inclination of 5° for improved rear ventilation.


FEATURES:

  • Width = 90 mm
  • Height = 101.5 mm
  • Inclination of 5°
  • Material: EN AW-6063 T66


Also available in a box of 20 units.

 

[2004631] K2 MiniRail 60 1.80m 122 In Stock
K2 MiniRail 60 1.80m
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K2 MiniRail 60 1.80m

K2 MiniRail for mounting solar modules on trapezoidal sheet metal roofs. Higher rail for the installation of optimisers and higher rear ventilation.

[2004596] K2 MiniRail 60 Set 114 In Stock
K2 MiniRail 60 Set
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K2 MiniRail 60 Set


Short rail for mounting solar modules on trapezoidal sheet metal roofs. Higher rail for the installation of optimisers and higher rear ventilation.

Material:Aluminium EN AW-6063 T66, EPDM, stainless steel A2

The set consists of:

  • 1 x MiniRail
  • Length: 0.385m
  • Width: 85.4mm
  • Height: 60mm
  • 4 x thread-forming metal screw (dimension: 6x25mm)
  • MiniRail EPDM Strip 380x20x3
[2004211] K2 MiniRail MK2 Set 1089 In Stock
K2 MiniRail MK2 Set
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K2 MiniRail MK2 Set


Short rail for mounting solar modules on trapezoidal sheet metal roofs, incl. 4 thread-forming tapping screw with sealing washer.

Material: Aluminium EN AW-6063 T66, EPDM, Stainless Steel A2

The set consists of:

  • 1 x MiniRail with EPDM, aluminium EN AW-6063 T66/ EPDM
  • Length: 0.385m
  • Width: 85.4mm
  • Height: 31.4mm
  • 4 x thread-forming tapping screw with EPDM


Also available in a box of 40 units.

[2002401] K2 MiniRail MiniFIVE End 90mm K2 MiniRail MiniFIVE End 90mm - Image 2 Check Availability
K2 MiniRail MiniFIVE End 90mm
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K2 MiniRail MiniFIVE End 9


Additional Adapter as a module support for K2 MiniRail System. Significantly more output by improved ventilation and optimised solar irradiation.


FEATURES:

  • Width = 90 mm
  • Inclination of 5°
  • Material: EN AW-6063 T66


Also available in a box of 20 units.

[2002399] K2 MiniRail MiniFIVE Front 90mm K2 MiniRail MiniFIVE Front 90mm - Image 2 Check Availability
K2 MiniRail MiniFIVE Front 90mm
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K2 MiniRail MiniFIVE Front 9

 

Additional Adapter as a module support for K2 MiniRail System. Significantly more output by improved ventilation and optimised solar irradiation.

 

FEATURES:      

  • Width = 90 mm
  • Inclination of 5°
  • Material: EN AW-6063 T66

 

Also available in a box of 20 units.

[2003293] K2 Multi Monti fastener for concrete 7,5 x 60 100 In Stock
K2 Multi Monti fastener for concrete 7,5 x 60
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K2 Multi Monti fastener for concrete 7,5 x 60


Screw anchor, Multi MontiMulti Monti screw anchor (Heco) for fastening to concrete with combined washer.

The certified screw anchor is driven directly into a pre-drilled hole, where it is immediately loadable.

Material: carbon steel bright zinc plated, A2K


  • Packing unit: 1 piece
  • Head shape: Hexagonal
  • Length (mm): 60
  • Screw system: External hexagon
[2002570] K2 Multi Monti fastener for concrete, 7.5 x 40 / 5 100 In Stock
K2 Multi Monti fastener for concrete, 7.5 x 40 / 5
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K2 Multi Monti fastener for concrete, 7.5 x 40/5


Concrete screw anchor MULTI-MONTI-plus MS 7,5x40 with flange head is driven directly into a pre-drilled hole, where it is immediately loadable. Its reinforced toothed concrete thread cuts an internal thread into the building material.

 

  • Head shape: Flat round head
  • Packing Unit: 1 piece
  • Length(mm): 40
  • Material: carbon steel bright zinc plated, A2K
  • Screw system: Socket TX 30
[2001300] K2 MultiRail 10 1075 In Stock
K2 MultiRail 10
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K2 MultiRail 10


The MultiRail mounting system for photovoltaic assemblies was developed specifically for trapezoidal sheet metal. It blends roof connection with module railing in one single component.


FEATURES:

  • Length: 100mm
  • Material: Aluminium EN AW-6063 T66, EPDM
  • Easy and proven – as a short rail or a flexible component in various lengths
  • Quick planning with less material and greater effectiveness
  • Solid base rail for S-Dome Small trapezoidal elevation
  • K2 MultiRail with EPDM-backing, pre-drilled for 2 screws per MultiRail


Also available in a box of 25 units.

[2004209] K2 MultiRail 10 CSM 265 In Stock
K2 MultiRail 10 CSM
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K2 MultiRail 10 CSM


Short rail with static confirmation in K2 Base. For direct mounting in landscape orientation on corrugated sheet metal covering with a radius of 22-45 mm.


FEATURES:

  • Length: 100mm
  • Height: 35mm
  • Widh: 39mm
  • Material: Aluminium EN AW-6063 T66, EPDM

 

Also available in a box of 30 units.

[2002793] K2 MultiRail 25 4 x Boreholes 436 In Stock
K2 MultiRail 25 4 x Boreholes
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K2 MultiRail 25 4 x Boreholes


The MultiRail mounting system for photovoltaic assemblies was developed specifically for trapezoidal sheet metal. It blends roof connection with module railing in one single component.


FEATURES:

  • Length: 250mm
  • Height: 32mm
  • Width: 39mm
  • Material: Aluminium EN AW-6063 T66, EPDM
  • Easy and proven – as a short rail or a flexible component in various lengths
  • Quick planning with less material and greater effectiveness
  • Solid base rail for S-Dome Small trapezoidal elevation
  • K2 MultiRail with EPDM-backing, pre-drilled for 4 screws per MultiRail


Also available in a box of 50 units.

[2004210] K2 MultiRail 25 CSM 2 In Stock
K2 MultiRail 25 CSM
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K2 MultiRail 25 CSM


Short rail with static confirmation in K2 Base. For direct mounting in landscape orientation on corrugated sheet metal covering with a radius of 22-45 mm.


FEATURES:

  • Length: 250mm
  • Height: 35mm
  • Widh: 39mm
  • Material: Aluminium EN AW-6063 T66, EPDM

 

Also available in a box of 50 units.

[1005394] K2 Omega Clip - Box of 100 2 In Stock
K2 Omega Clip - Box of 100
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K2 Omega Clip


External cable clip of solar cables for cables extending beyond K2 rails.

Fixation in the C-chamber of the profile.


Material: Polypropylen with UV stabiliser, black

[1002361] K2 Pad Spacer PA 2mm 39 In Stock
K2 Pad Spacer PA 2mm
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K2 Pad Spacer PA 2mm


Spacer compensates for height differences when installing the K2 threaded roof hooks and the K2 rails (except solid), any number of spacers can be stacked on top of each other for individual height compensation.

Material: glass fiber reinforced PA


Also available in a box of 1,000 units.

[2000120] K2 Rafterbolt M10-180 Set 175 In Stock
K2 Rafterbolt M10-180 Set
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K2 Rafterbolt M10-180 Set


For fastening of K2 System parts on trapeze and wave shape roofs. The K2 Rafter Screw is equipped with an extra long metric thread enabling variable height adjustment. The screw is furnished with a hexagonal head, providing time saving installation with a power drill.


The set consists of:

  • 1 rafter screw
  • 3 Collar nut with riffle, Stainless steel
  • 1 Rubber seal, EPDM
  • 1 Washer, Stainless steel
  • 1 Adapter plate with long slot 11 x 39 mm, Stainless steel


Also available in a box of 100 units.

[2000121] K2 Rafterbolt M10-200 Set 304 In Stock
K2 Rafterbolt M10-200 Set
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K2 Rafterbolt M10-200 Set


For fastening of K2 System parts on trapeze and wave shape roofs. The K2 Rafter Screw is equipped with an extra long metric thread enabling variable height adjustment. The screw is furnished with a hexagonal head, providing time saving installation with a power drill.


The set consists of:

  • 1 rafter screw
  • 3 Collar nut with riffle, Stainless steel
  • 1 Rubber seal, EPDM
  • 1 Washer, Stainless steel
  • 1 Adapter plate with long slot 11 x 39 mm, Stainless steel


Also available in a box of 100 units.

[2000122] K2 Rafterbolt M10-250 Set 13 In Stock
K2 Rafterbolt M10-250 Set
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K2 Rafterbolt M10-250 Set


For fastening of K2 System parts on trapeze and wave shape roofs. The K2 Rafter Screw is equipped with an extra long metric thread enabling variable height adjustment. The screw is furnished with a hexagonal head, providing time saving installation with a power drill.


The set consists of:

  • 1 rafter screw
  • 3 Collar nut with riffle, Stainless steel
  • 1 Rubber seal, EPDM
  • 1 Washer, Stainless steel
  • 1 Adapter plate with long slot 11 x 39 mm, Stainless steel


Also available in a box of 100 units.


Available to order within 3-5 working days. Contact sales on 020 3763 7000 or at sales@alternergy.co.uk.

[1002389] K2 Rail Connector Set - CrossRail 36 Check Availability
K2 Rail Connector Set - CrossRail 36
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K2 Rail Connector Set - CrossRail 36


Aluminium rail connector as connecting element between two K2 CrossRails 36.


The set consists of:

  • 1 Rail connector (P1002284), Aluminium
  • 4 T-Bolts M8 x 20, Stainless steel


Also available in a small box of 10 units and larger box of 70 units.

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