WK-DS085 SPIRAL ANCHOR 10PCS

A finished insulated facade still has to carry a house number, a bell push and a sensor bracket, and by then there is no masonry within reach. The WK-DS085 is the long fastener for that job, stocked at Renders World within the EWI insulation fixing accessories range.

What the WK-DS085 Spiral Anchor Fixes to a Polystyrene-Insulated Wall

The WK-DS085 spiral anchor is an 85 mm screw-in helical fastener that Klimas rates for lightweight non-structural fittings up to 5 kg per piece on polystyrene insulation walls, mounted without a through-fixing to the substrate.

Klimas names the fittings it is meant for — signboards, building numbers, mailboxes, lighting fixtures and motion sensors — which is most of what an elevation ends up carrying. Because the helix is driven into the insulation layer rather than past it, the sheet states that the fastener keeps continuity of the thermal insulation at the installation spot and eliminates thermal bridges there, and that is the reason it is fitted in preference to a plug reaching the wall behind.

• Stated substrate — polystyrene insulation walls, which is the only substrate the data sheet names for this fastener.
• Rated load — up to 5 kg per fastener, non-structural, applied as a static load from the mounted item.
• Body material — polyamide, specified by Klimas for resistance to changing weather conditions on an exposed elevation.

Why Fitters Choose the 85 mm Anchor Over a Through-Fixing

• Insulation continuity at every fixing point — the fastener stays inside the insulation layer, so a bell push does not open a path through the build-up.
• One bit, one operation — Klimas specifies a screw gun with a TORX-30 bit, and nothing else is needed at the wall once the position is marked.
• A 28 mm plate — load is spread across the plate rather than concentrated on a single screw shank sitting in soft board.
• One screw size to order — Ø 4.5 mm, and the sheet is explicit that it is not supplied, so it goes on the order rather than being guessed at on site.
• A 10-piece box — the pack matches the handful of accessory positions a finished elevation genuinely has, and prices cleanly into a schedule.

WK-DS085 Technical Specifications From the Klimas Data Sheet

Property	Value
Product code	WK-DS085
Manufacturer	Klimas Sp. z o.o. (Wkręt-met)
Fastener length	85 mm
Plate diameter	28 mm
Socket type	TORX-30
Screw diameter	4.5 mm, not supplied
Material	Polyamide
Maximum load	5 kg per piece, non-structural
Stated substrate	Polystyrene insulation walls
Pack quantity	10 pcs

 

One thing to settle before ordering: the Klimas sheet publishes a fastener length and no length-to-board-thickness table. The 85 mm body is a dimension, not a recommendation for a board depth, so the insulation depth at each mounting position is confirmed from the build-up record or on site — no arithmetic on the sheet's figures will produce that mapping.

How to Install the WK-DS085: Both Sequences Klimas Recognises

Klimas gives two installation routes, and which applies depends on whether the accessory positions are known before the reinforced layer goes on. Where they are, the fastener is screwed into the thermal insulation before the adhesive and reinforcing mesh are applied. On a wall that is already rendered, the sheet is specific: drill through the applied adhesive, reinforcing mesh and plaster with a drill bit for work in concrete, then screw the fastener into the insulation behind. The finish coat is drilled, not driven through.

1. Mark the installation positions on the facade before anything else, as step one of the sheet's method.
2. Either fit the fastener ahead of the adhesive and mesh, or drill the finished layers at each mark with a concrete bit.
3. Drive the fastener into the insulation with a screw gun and TORX-30 bit until the plate is seated.
4. Fix the item with a Ø 4.5 mm screw, bought separately and sized to the thickness of what is being mounted.

Klimas closes its sheet by noting that it does not stand behind the fixing where its recommendations on use and installation are not followed — which makes the drilled-hole route on a cured facade a specification point rather than a preference. For where mechanical fixings sit in the system as a whole, the EWI fixings installation guide sets out the sequence, and board plugs and their layout belong with the fixing pattern and spacing guide.

Fitting Notes: Screw Choice, Seating and What the Sheet Leaves to Site

The declared parameters cover the fastener and stop there, so the screw and the seating are the fitter's decisions. Trade practice on a long spiral anchor for insulation work is to use stainless steel externally, since a plated head weathers in exactly the visible position the accessory occupies.

• Screw material — stainless steel outdoors; the sheet sets the diameter at 4.5 mm and says nothing about material, so this is a durability choice rather than a declared requirement.
• Screw length — enough to pass the item and engage the fastener body fully, without bottoming out hard inside it.
• Seating — bring the 28 mm plate level with the finished surface, so the mounted item sits flat against the facade.
• What the sheet excludes — structural attachments, and anything exposed to large dynamic forces, with shutters, blinds and shades given as the manufacturer's own examples.

WK-DS085 or WK-DS050: Matching Fastener Length to the Detail

Both sizes of WK-DS are declared on one Klimas data sheet, and every published parameter except length is shared between them. The choice is therefore a single question about the depth of insulation at the mounting position.

Parameter	WK-DS085 (this pack)	WK-DS050
Fastener length	85 mm	50 mm
Plate diameter	28 mm	28 mm
Socket	TORX-30	TORX-30
Screw	4.5 mm, not supplied	4.5 mm, not supplied
Maximum load	5 kg, non-structural	5 kg, non-structural
Pack	10 pcs	10 pcs, 50 mm variant

 

Since the plate, socket, screw size and load rating are identical, the longer body is not the stronger fastener — it simply sits in more insulation where more insulation is present.

Ordering the WK-DS085 Pack: Price, Quantity and Screws

Renders World lists the 10-piece pack at £9.00, August 2026, reported available at the same fetch, with a listed pack weight of 500 g for carriage. Per fixing point that is £9.00 ÷ 10 = £0.90 per fastener, before the screw.

• Screws — one 4.5 mm screw per fastener, not in the box, length set by the item.
• Quantity — count fixing points rather than accessories, since a bracket may take two or four.
• Length — confirm the insulation depth at each position before choosing between the 85 mm and 50 mm bodies.

Is the WK-DS085 the Right Fastener for Your Detail?

• Light fittings on a polystyrene-insulated wall — the stated application: up to 5 kg, non-structural, on boards such as the graphite EPS insulation boards range.
• Shallower insulation at the fixing point — the 50 mm WK-DS050 spiral anchor shares the plate, socket, screw size and 5 kg rating with a shorter body.
• Shutters, blinds, awnings and anything structural — these sit outside the sheet's scope, so a through-fixing to the substrate is the right specification and performs best there.
• Stone wool linings — the declared substrate is polystyrene, so slabs from the mineral wool insulation range need a fastener declared for wool.
• Trade schedules — the Renders World desk will size fastener packs and screw lengths against an accessory list before the order goes in.

FAQ — WK-DS085 Load, Screws and Fitting Questions

Is the screw supplied with the pack? No. The box holds ten polyamide fasteners, and Klimas specifies a Ø 4.5 mm screw that is not supplied. Order screws alongside the pack, in stainless steel for anything external.

How many packs will a job take? Work from fixing points, because the schedule varies with what is being mounted:

• List the items going onto the finished elevation.
• Count the fixing points each one needs.
• Divide the total by the ten fasteners in a pack.

How much can one fastener hold? Up to 5 kg per piece, non-structural only. Items exposed to large dynamic forces are excluded by the manufacturer, and those take a through-fixing to the masonry or timber behind.

Which length suits my wall, 85 mm or 50 mm? The two share every declared parameter except length, so the answer follows the insulation depth at the mounting position. Klimas publishes no length-to-thickness table, so confirm the depth from the build-up record rather than reading it off a board schedule.

Can the fastener go into mineral wool? The data sheet names polystyrene insulation walls and no other substrate, so a wool facade is outside its declared scope. Specify a fastener declared for stone wool, and the fixing is covered by its own manufacturer's instructions.

Technical Documentation for the WK-DS085

• Klimas WK-DS product page and data sheet download — sizes, application, installation method and technical parameters, fetched August 2026.