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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.


[2003024] K2 Single Standing Seam Clamp Check Availability
K2 Single Standing Seam Clamp
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K2 Single Standing Seam Clamp


Double standing seam suits SingleRail System.

The Single Standing SeamClamp is suitable for double folded standing seams made of titanium zinc, aluminium, stainless or galvanised steel.


FEATURES:

  • Aluminium clamp
  • Opening dimension: 7.0mm


Also available in a box of 50 units.

[2001928] K2 SingleHook 1.1 Set 51 In Stock
K2 SingleHook 1.1 Set
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K2 SingleHook 1.1 Set


To fasten K2 system components to tile roofs with narrow rafters from 36 mm. Slotted bore hole bracket for installation and height adjustability of the SingleRail including T-Bolt (stainless steel) and locking nut (stainless steel).

Material: Aluminium EN AW-6063 T66


Also available in a box of 40 units.

[2002651] K2 SingleHook Vario Set Check Availability
K2 SingleHook Vario Set
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K2 SingleHook Vario Set


Dual, height-adjustable SingleHook Vario roof fastener, made of stainless steel, for direct connection to the SingleRail.

Bracket with slotted hole for mounting and adjusting the height of the SingleRail.

Height of bracket infinitely adjustable on baseplate to suit various battens by means of slotted hole. Including T-Bolt and Locking nut for SingleRail assembly.


Dimensions:

  • Base plate width: 100 mm
  • Height under bracket: 45-65 mm
  • Bracket height: 68 mm
  • Total height: 172-192 mm
  • Bracket depth: 110 mm


Material: Stainless steel


Also available in a box of 25 units.

[2001976] K2 SingleRail 36 - Rail Connector Set 318 In Stock
K2 SingleRail 36 - Rail Connector Set
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K2 SingleRail 36 - Rail Connector Set


K2 SingleRail 36 - Rail Connector Set Rail connector for K2 mounting rails, type "SingleRail 36". Material: Aluminium.


Set consists of:

  • 1 x SingleRail connector 36, aluminium EN AW-6063 T66
  • 4 x T-Bolts M8x20 Stainless Steel
  • 4 x locking nut M8, Stainless Steel


Also available in a small box of 10 units and larger box of 60 units.

[2004258] K2 SingleRail 36 3.65m 180 In Stock
K2 SingleRail 36 3.65m
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K2 SingleRail 36 3.65m


K2 SingleRail 36 mounting rail with side-connection and static confirmation in K2 Base. Can be used variably for different roof connections


FEATURES:

  • Length: 3.65m
  • Material: aluminium EN AW-6063 T66

Also sold in 100 units/pallet

[2002404] K2 SingleRail 50 - Rail Connector Set 71 In Stock
K2 SingleRail 50 - Rail Connector Set
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K2 SingleRail 50 - Rail Connector Set


K2 SingleRail 50 - Rail Connector Set Rail connector for K2 mounting rails, type "SingleRail 50". Material: Aluminium.


Set consists of:

  • 1 x SingleRail connector 50, aluminium EN AW-6063 T66
  • 4 x T-Bolts M8x20 Stainless Steel
  • 4 x locking nut M8, Stainless Steel


Also available in a small box of 10 units and larger box of 50 units.

[2003606] K2 SingleRail 50 3.65m 57 In Stock
K2 SingleRail 50 3.65m
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K2 SingleRail 50 3.65m


K2 SingleRail 50 mounting rail with side-connection and static confirmation in K2 Base. Can be used variably for different roof connections


FEATURES:

  • Length: 3.65m
  • Material: Aluminium

Also sold in 100 units/pallet

[2002683] K2 SingleRail L-Adapter SET 47 In Stock
K2 SingleRail L-Adapter SET
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K2 SingleRail L-Adapter SET


Set consists of:

  • 1 L-adapter SingleRail, aluminium
  • 1 self-locking nut M8, stainless steel
  • 1 T-Bolt M8x20, stainless steel
  • 1 Mushroom head bolt M10x25 stainless steel
  • 1 Serrated nut M10, stainless steel


Also available in a box of 100 units.

[2003393] K2 SingleRail Splice Foot 258 In Stock
K2 SingleRail Splice Foot
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K2 SingleRail Splice Foot


Aluminium roof fastener with SingleRail connection for bitumen roofs. Base plate: 89 mm x 50.8 mm. Total height of component: 68 mm. Height adjustment: 36.9 mm - 57.5 mm.



Material:
Aluminium EN AW-6063 T66.

[1001643] K2 Slot Nut M8 - Stainless Steel 1720 In Stock
K2 Slot Nut M8 - Stainless Steel
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K2 Slot Nut M8 - Stainless Steel


The Fast-installation M K2 slot nut can be put into the K2 rail everywhere. The slotted nut will adjust itself in the rail and can be readjusted to every place of the rail.

  • Material: Stainless steel
  • Thread of screw: M8


Also available in a box of 250 units.

[2001853] K2 Solid Round Seam Clamp 123 In Stock
K2 Solid Round Seam Clamp
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K2 Solid Round Seam Clamp


Metal seam clamp with a round hole for fixing the K2 SolidRail on metal seam roofs with double standing seam. Material: stainless steel A.

  • Round seam
  • Opening dimension: 10,5 mm


Also available in a box of 100 units.

[2003082] K2 Solid Snap Seam Clamp CF x 60 In Stock
K2 Solid Snap Seam Clamp CF x
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K2 Solid Snap Seam Clamp CF x

 

Double standing seam suits SingleRail System.

The K2 Solid Snap Seam Clamp CF x is suitable for angled and snap seam profiles. Material: Clamp: Aluminium; Screws: Stainless steel A2

 

FEATURES:     

  • Aluminium clamp
  • Opening dimension: 14.0mm

 


 

[2001712] K2 Solid Standing Seam Clamp Check Availability
K2 Solid Standing Seam Clamp
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K2 Solid Standing Seam Clamp


Metal seam clamp with round hole for fixing the K2 SolidRail on metal seam roofs with double standing seam.


FEATURES:

  • Double folded standing seam
  • Material: Stainless Steel A2
  • Standing seam opening width: 3.5 mm


Also available in a box of 100 units.

[2004244] K2 SolidHook Vario 2 Narrow Rafters K2 SolidHook Vario 2 Narrow Rafters - Image 2 162 In Stock
K2 SolidHook Vario 2 Narrow Rafters
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K2 SolidHook Vario 2 Narrow Rafters


Stainless steel roof hook for SolidRail and InsertionRail.

For fastening of K2 System parts on clay brick roofs with pan tile roofing. Bracket with elongated hole to fix the SolidRail with T-Bolt and nut M10.

Similar to the original Vario2 (1000107) but the borehole pattern in the base plate is different. With this new design (non-staggered) borehole, one can now also fix the hook to narrow rafters as woodscrews can be placed in line.

FEATURES:

  • Base plate: 140x55x5 mm
  • Bracket: 30x6 mm
  • Bracket height: 57-76 mm
  • Height under bracket: 41-50 mm
  • Total height: approx. 128-156 mm
[2004269] K2 SolidRail Light Rail 3.65m 219 In Stock
K2 SolidRail Light Rail 3.65m
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K2 SolidRail Light Rail 3.65m


Aluminum mounting rail with static confirmation for low snow zones and short spans.


FEATURES:

  • Length: 3.65m, Height: 37mm
  • Material: Aluminium EN AW 6063-T66
[2003013] K2 SolidRail SolFastener M8x85/50 I FZD Check Availability
K2 SolidRail SolFastener M8x85/50 I FZD
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K2 SolidRail SolFastener M8x85/50 I FZD 


Solar panel Solar Fastener for steel Ø 8,0 with M8x85/50 thread, FZD Solar fastener (stainless steel) for mounting K2 system components on roofs with sheet metal or trapeze or wave shaped roofs (for steel substructure) (without adapter plate). Building authority-certified. The head of the bolt has a six-lobe drive.

  • Clamping area (mm): 14-55
  • Suitable mounting systems: InsertionRail, SolidRail
  • Pitched Roof
  • Screw Length (mm): 85
  • Screw Thread: M10x50
  • Weight: 0.094Kg
[2004264] K2 SolidRail UltraLight Rail 3.65m 379 In Stock
K2 SolidRail UltraLight Rail 3.65m
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K2 SolidRail UltraLight Rail 3.65m


Aluminum mounting rail with static confirmation. Can be used variably for different roof connections.


FEATURES:

  • Length: 3.65m, Height: 32mm
  • Material: Aluminium EN AW-6063

Also sold in 100 units/pallet

[2004106] K2 Spax Screw 6 x 80 -  100 units 13 In Stock
K2 Spax Screw 6 x 80 - 100 units
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K2 Spax Screw 6 x 80


Self-drilling wood screw, flange head Self-drilling wood screw with flange head (Topix) and star socket (Torx) from Heco. With European Technical Assessment (ETA) approval.

  • Box of 100 Units
  • Dimension: M6x80
  • Matches TX 25/40 screwdrivers
  • Material: stainless steel A2
[2004111] K2 Spax Screw 8 x 80 - 50 Units 17 In Stock
K2 Spax Screw 8 x 80 - 50 Units
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K2 Spax Screw 8 x 80


Self-drilling wood screw, flange head Self-drilling wood screw with flange head (Topix) and star socket (Torx) from Heco. With European Technical Assessment (ETA) approval.

  • Box of 50 Units
  • Dimension: M8x80
  • Matches TX 25/40 screwdrivers
  • Material: stainless steel A2
[2004112] K2 Spax Screw M8 x 100 - box of 50 units 38 In Stock
K2 Spax Screw M8 x 100 - box of 50 units
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K2 Spax Screw M8 x 100


Self-drilling wood screw, flange head Self-drilling wood screw with flange head (Topix) and star socket (Torx) from Heco. With European Technical Assessment (ETA) approval.

  • Box of 50 Units
  • Dimension: M8x100
  • Matches TX 25/40 screwdrivers
  • Material: stainless steel A2
[1001164] K2 SpeedClip Check Availability
K2 SpeedClip
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K2 SpeedClip


Glass fibre reinforced clip for direct mounting of SpeedRail on sheet metal.

Material: glass fibre reinforced polyamide, EPDM


Also available in a box of 40 units.


Please note, for each SpeedClip you need 2 head steel sheet screws 6x36 mm

[1003558] K2 Speedlock Set 22 307 In Stock
K2 Speedlock Set 22
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K2 Speedlock Set 22


“SpeedLock” mounting security for fusing the K2 SpeedRail in case of thermal expansion.


The set consists of:

  • 1 SpeedLock, Aluminium
  • 1 DIN 7991 hexagon socket countersunk head screw M8 x 20, stainless steel
  • 1 M K2 slot nut with clip, Stainless steel, plastic


Also available in a small box of 10 units and larger box of 140 units.

[2004057] K2 Stairplate Set 114 In Stock
K2 Stairplate Set
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K2 Stairplate Set


Micro Inverter and Optimiser of the companies Solar Edge and Enphase can be hooked in all K2 rails (except MiniRail) with K2 StairPlate without screwing it directly on the roof. With the corresponding screws and nuts the tools can be connected with the K2 StairPlate in advance. The height of the modules and the tools to be used must be noted.


Material stainless-steel 1.4301

[2002035] K2 T Bolt 20/12 M8x30 for Crossrail 1782 In Stock
K2 T Bolt 20/12 M8x30 for Crossrail
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K2 T Bolt M8x30 20/12

 

T bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head form: 20/12

 

Also available in a box of 100 units. 

[1000637] K2 T Bolt M10x20 2553 In Stock
K2 T Bolt M10x20
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K2 T Bolt M10x20


T Bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head form: 28/15
  • Head dimensions: 22.5 × 10.5 × 4 mm
  • Material: Stainless steel A2 (1.4301)
  • Thread of screw: M10x20 mm


Also available in a box of 100 units.

[1000041] K2 T Bolt M10x30 1457 In Stock
K2 T Bolt M10x30
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K2 T Bolt M10x30


T Bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head form: 28/15
  • Head dimensions: 22.5 × 10.5 × 4 mm
  • Material: Stainless steel A2 (1.4301)
  • Thread of screw: M10x30 mm


Also available in a box of 100 units.

[1002387] K2 T Bolt M8x20 1165 In Stock
K2 T Bolt M8x20
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K2 T Bolt M8x20


T Bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head shape: 20/12
  • Head dimensions: 15.5 x 8.5 x 4 mm
  • Material: Stainless steel A2 (1.4301)
  • Thread of screw: M8x20 mm


Also available in a box of 100 units.

[1000614] K2 T Bolt M8x20 with Wider Head 28/15 701 In Stock
K2 T Bolt M8x20 with Wider Head 28/15
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K2 T Bolt M8x20 with Wider Head 28/15


T Bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head: 28/15 with four cornered shaft
  • Material: Stainless steel A2 (1.4301)
  • Thread of screw: M8x20 mm


Also available in a box of 100 units.

[1000368] K2 T Bolt M8x30 2841 In Stock
K2 T Bolt M8x30
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K2 T Bolt M8x30


T bolt to be placed anywhere into the c-cell of the rail. It can be placed and readjusted to any place of the rail.

  • Head form: 28/15
  • Head dimensions: 22.5 × 10.5 × 4 mm
  • Material: Stainless steel A2 (1.4301)
  • Thread of screw: M8x30 mm


Also available in a box of 100 units.

[2001881] K2 TerraGrif K2SZ 333 In Stock
K2 TerraGrif K2SZ
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K2 TerraGrif K2SZ


Mounting accessories for establishing equipotential bonding of the K2 mounting systems or for earthing the module frames. 

** Incompatible systems: BasicRail (landscape mounting).

 

Material: stainless steel 301 TA

[2003427] K2 Thread-Forming Metal Screw 4.8x20mm 1578 In Stock
K2 Thread-Forming Metal Screw 4.8x20mm
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K2 Thread-Forming Metal Screw 4.8x20mm


K2 Self-tapping screw with mounted EPDM supported washer. Hexagon screws for the connection of mounting rails and rail connectors, as well as for the SpeedClip assembly.


FEATURES:

  • Dimension: 4.8x20 mm
  • Material: Stainless steel A2, EPDM


Also available in a box of 500 units.

[2002514] K2 Universal End Clamp One SILVER 30-42mm K2 Universal End Clamp One SILVER 30-42mm - Image 2 76 In Stock
K2 Universal End Clamp One SILVER 30-42mm
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K2 Universal End Clamp One SILVER 30-42mm


Universal clamp (end clamp) with easy "click" function for the SingleRail (36,50,63), CrossRail (36,48,80), UltraLight(32), Light (37), SpeedRail (22), MultiRail, ClampRail and CoverRail pitched roof systems, as well as for the S-Domeand D-Dome flat roof systems.


FEATURES:

  • Module frame heights: 30-42mm
  • Dimensions: 65 x 33 x 66.8 mm
  • Material: EN AW 6063 T66 / EN AW 6082 T6 / A2 / POM


Also available in a box of 20 units.

[2004124] K2 Universal KL-Clamp – Box of 20 K2 Universal KL-Clamp – Box of 20 - Image 2 60 In Stock
K2 Universal KL-Clamp – Box of 20
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K2 Universal KL-Clamp – Box of 20


K2 sheet metal seam clamp for Klip-Lok 700 Hi-strength® and Klip-Lok Optima® 700 (Lysaght ™) sheet metal roofing; KingKlip® 700 (Fielders®); Klip-Lok® 406 (Lysaght ™).

With direct connection option for K2 module clamps.

Material: Aluminium EN AW 6063-T66

[2003071] K2 Universal Mid Clamp One SILVER 30-42mm 90 In Stock
K2 Universal Mid Clamp One SILVER 30-42mm
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K2 Universal Mid Clamp One SILVER 30-42mm


Universal clamp (mid clamp) with easy "click" function for the SingleRail (36,50,63), CrossRail (36,48,80), UltraLight (32), Light (37), SpeedRail (22), MultiRail, ClampRail and CoverRail pitched roof systems, as well as for the S-Dome and D-Dome flat roof systems.


FEATURES:

  • Module frame heights: 30-42mm
  • Dimensions: 65 x 37 x 65.6 mm
  • Material: EN AW 6063 T66 / EN AW 6082 T6 / A2 / POM


Also available in a box of 20 units.

[1001052] S-5! Seam Clamp Check Availability
S-5! Seam Clamp
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S-5!  | Alternergy

S-5! Seam Clamp


For fastening of K2 System parts on standing seam metal roofs.


Available to order within 2-3 working days. Contact sales on 020 3763 7000 or at sales@alternergy.co.uk.

[79-s-5-GXM10] S-5-GXM 10 Mini insert 211 In Stock
S-5-GXM 10 Mini insert
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S-5!  | Alternergy

S-5-GXM 10 Mini insert


S-5-GXM 10 Mini insert - specifically for use with the S-5-K Grip Mini clamp.

GXM-10 insert is suitable for use on:

  • SpeedDeck® SpeedDeck®
  • LYSAGHT KLIP-LOK® 406
  • McElroy Metal Mirage
  • AEP Span Klip-Rib®
  • Metal Sales Clip-Loc
  • Safintra Saflok 410
  • Safintra Saflok 700
  • Domico Dach®And other similar profiles


Please refer to product datasheet for full list of compatible roof materials.


Note: K-Grip seam clamps can come with 2 different ‘mini inserts’: one smaller S-5-GXM 50 (Mini) and one bigger S-5-GXM 10 (Mini), which is more popular in this country. Still, it's important to check if the insert you require fits in the roof covering before ordering.

[79-s-5-GXM50] S-5-GXM 50 Mini insert Check Availability
S-5-GXM 50 Mini insert
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S-5!  | Alternergy

S-5-GXM 50 Mini insert


S-5-GXM 50 Mini insert - specifically for use with the S-5-K Grip Mini clamp.

GXM-50 insert is suitable for use on:

  • LYSAGHT KLIP-LOK Classic® 700
  • LYSAGHT KLIP-LOK 700 Hi-Strength®
  • Stramit® Speed Deck Ultra®
  • Fielders KingKlip® 700
  • And other similar profiles


Please refer to product datasheet for full list of compatible roof materials.


Note: K-Grip seam clamps can come with 2 different ‘mini inserts’: one smaller S-5-GXM 50 (Mini) and one bigger S-5-GXM 10 (Mini), which is more popular in this country. Still, it's important to check if the insert you require fits in the roof covering before ordering.

[79-S-5-K-Grip-Mini] S-5-K Grip Mini S-5-K Grip Mini   - Image 2 22 In Stock
S-5-K Grip Mini
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S-5!  | Alternergy

S-5-K Grip Mini clamp


The S-5-K Grip Mini clamp was specifically developed to fit Klip-Rib® and other bulb snap-together seams. The design utilizes multiple inserts (sold separately) in order to accommodate a variety of bulb snap-together profiles. Each insert has a unique shape that allows for a tight fit and provides increased holding strength over other attachment options. Compatible with most common metal roofing materials excluding copper.

The S-5-K Grip Mini is a bit shorter than the S-5-K Grip and has one base bolt rather than two.


All included hardware is stainless steel. Each mini clamp is supplied with 1 x M8 bolt.

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