Attaching additional equipment to a car is a task that almost every owner faces. Whether it's installation parking sensors, LED backlight, rear view cameras or even a bumper after repair - you can’t do without reliable fastenings. This is where they come to the rescue self-tapping clips for cars - small but critical details on which the strength and durability of the installation depends.
However, not all clips are created equal. Selecting the wrong type or material may result in peeling paint on the body, corrosion at fastening points, or even tearing off of equipment while driving. In this article, we’ll look at what types of clips there are, how to choose them correctly for a specific task, and how to avoid common mistakes during installation - from choosing the diameter to processing the holes before screwing them in.
We will pay special attention to nuances that are rarely talked about: for example, why stainless steel clips are not always better than plastic ones, how to properly drill holes for them in aluminum panels and what to do if the self-tapping screw “does not hold” in a plastic bumper. I also collected current prices for 2026 and a comparative table of popular brands - from budget to premium.
What are self-tapping clips and why are they needed?
Self-tapping clip (also called piston or self-tapping bushing) is a fastener that is inserted into a pre-drilled hole in the body or plastic part of the car. It serves two purposes:
- Fixes the self-tapping screw, preventing it from turning in soft material (plastic, aluminum).
- Distributes the load, preventing cracking or deformation of the panel.
Without a clip, the self-tapping screw becomes loose over time, especially if it is subject to vibration (for example, when driving off-road). This leads to:
- 🔧 Loss of fastening — equipment falls off or dangles.
- 💦 Moisture penetration — through the expanded hole, water enters the body cavities, causing corrosion.
- 🎨 Damage to paintwork - the self-tapping screw scratches the paint from the inside, which later leads to rust.
Clips are divided into two main types based on material:
- 🔄 Plastic - lightweight, do not conduct current, do not rust, but less durable. Suitable for attaching light elements (wiring, lighting).
- ⚙️ Metal (steel, aluminum, brass) - withstand high loads, but require anti-corrosion treatment. Used for heavy parts (bumpers, crankcase protection).
Types of clips for self-tapping screws: how not to get confused in sizes and shapes
The main problem when choosing clips is the lack of a universal standard. Manufacturers use different designation systems, and sizes may differ even for outwardly similar models. Let's look at the key parameters that you need to focus on.
1. Hole diameter - the most critical parameter. The clip should fit tightly into the hole, but not split it. Popular sizes:
- 📏
5 mm— for light plastic panels (door trim, dashboard). - 📏
6–8 mm- a universal option for most body work. - 📏
10 mm or more— for heavy parts (bumpers, engine protection).
2. Clip length depends on the thickness of the material in which it is installed. For example:
- 🔹
10–15 mm— for thin plastic (body kits, spoilers). - 🔹
20–30 mm- for metal body panels. - 🔹
40 mm+— for multilayer structures (for example, bumper + amplifier).
3. Head shape determines which screw can be used:
- 🔧 Flat head — for “secret” fastenings (for example, in the cabin).
- ⚙️ Hexagon - for reliable fixation of heavy parts.
- ⭐ Under the Star (Torx) - often used in premium cars (Audi, BMW).
Important: some clips have thread inside (for screwing in a self-tapping screw) and ribbed surface on the outside (for fixing in the hole). For example, clips Hilti or Fischer This design is often used for maximum reliability.
How to measure the diameter of a hole without a caliper?
If you don't have precise tools at hand, take a self-tapping screw that fits tightly into the hole and measure its diameter with a ruler. Then subtract 0.5–1 mm - this will be the desired clip size. For example, if a 6 mm screw fits tightly, take a 5–5.5 mm clip.
Top 5 clip brands: comparison table 2026
There are hundreds of manufacturers on the market, but only a few are trustworthy. We tested clips from different brands for strength, corrosion resistance and ease of installation. The results are in the table below.
| Brand | Material | Diameters (mm) | Price for 10 pcs. (₽) | Features |
|---|---|---|---|---|
| Fischer | Stainless steel/nylon | 5–12 | 450–700 | Best price-quality ratio, suitable for VW, Skoda, Toyota. |
| Hilti | Galvanized steel | 6–16 | 800–1200 | For professional installation, they can withstand loads of up to 50 kg per mount. |
| Moll | Aluminum/plastic | 4–10 | 300–500 | Lightweight and corrosion-resistant, ideal for interior electrical applications. |
| HEYCO | Nylon PA66 | 5–8 | 200–400 | A budget option for plastic panels, they do not rust, but are fragile in cold weather. |
| Böllhoff | Stainless steel A2/A4 | 6–20 | 1000–1500 | Premium segment, used in Mercedes, Porsche. 10 year warranty. |
⚠️ Attention: Clips HEYCO and other budget brands may become brittle at temperatures below -20°C. If you operate your car in a harsh climate, choose metal analogues or nylon clips with a modifier PA66-GF30 (resistant to frost).
Step-by-step instructions: how to install a clip under a self-tapping screw
It would seem that it could be simpler - drill a hole, insert a clip, screw in a self-tapping screw. But in practice there are a lot of nuances on which the reliability of the fastening depends. Let's look at the process step by step.
1. Marking and drilling
- 📍 Use masking tape for marking - it will prevent the drill from slipping.
- 🔨 For metal, take a drill 0.1–0.2 mm smaller than the diameter of the clip (for example, for a 6 mm clip - a 5.8 mm drill). For plastic, on the contrary, 0.1 mm more.
- ⚡ Drill at low speed (400-600 rpm) to avoid melting the plastic or damaging the paint.
2. Hole processing
- 🧴 For metal: apply anti-corrosion composition (for example, Molykote or WD-40 Specialist) to the edges of the hole.
- 🖌️ For plastic: remove burrs and melted edges with a stationery knife.
3. Installation of the clip
- 🔧 Insert the clip perpendicular to the surface - misalignment will lead to a loose fit.
- 🛠️ For metal clips, use mandrel (can be made from a bolt of a suitable diameter) so as not to deform the thread when driving.
- ❄️ If the clip doesn't fit: don't hit it with a hammer! Heat it with a hairdryer (for plastic) or lubricate it with silicone grease.
4. Tightening the self-tapping screw
- 🔩 Use a self-tapping screw with countersunk head, if the clip is recessed into the panel.
- 🔧 Tighten without fanaticism - an overtightened screw can break the thread in the clip.
✅ Checked the diameter of the drill and clip
✅ Cleaned the surface from dirt and oil
✅ Applied anti-corrosion coating (for metal)
✅ Prepared a mandrel for hammering in the clip
✅ I chose a self-tapping screw with a suitable head
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If the clip rotates in the plastic, drop a drop into the hole cyanoacrylate glue (superglue) before installation. This will increase grip, but will make disassembly more difficult.
Common mistakes and how to avoid them
Even experienced craftsmen sometimes make mistakes when working with clips. Here are the most common ones and how to prevent them:
1. Wrong hole diameter
If the hole is too large, the clip will wobble; if it's too small, the plastic will crack. Solution: Always drill to size, taking into account the material:
- 🔹 Metal: the drill is 0.1–0.2 mm smaller than the clip.
- 🔹 Plastic: the drill is 0.1 mm larger (the plastic shrinks when inserted).
2. Ignoring anti-corrosion treatment
Metal clips without protection rust in 1–2 years, especially in places with high humidity (wheel arches, sills). Solution: use clips from stainless steel A4 (for marine climates) or treat galvanized clips Zincorem.
3. Tightening the self-tapping screw
Excessive tightening force will deform the clip or break the thread. Solution: tighten the screw until it stops, and then make a quarter turn back - this will relieve the tension.
4. Using wood screws
Self-tapping screws with rare threads (for example, “yellow” or “black”) are not intended to work with clips. They have a large thread pitch and do not hold well. Solution: take screws from fine carving (for example, M4×0.7 or M5×0.8).
The most common reason for clips falling out is the wrong choice of screw. Use only self-tapping screws with fine metric thread (not “dowel” or “wood”).
How to remove the clip without damaging the panel
Removing the clip without damaging the hole is not an easy task. Especially if it was installed a long time ago and has become “stuck”. Here are proven methods:
1. For plastic clips:
- 🔥 Heat the clip with a construction hairdryer (temperature 60–80°C) - the plastic will become softer.
- 🪛 Pry the clip with a thin flat-head screwdriver, rocking it from side to side.
- 🧲 If the clip is broken, drill it with a drill 1 mm smaller than the hole diameter, then cut a new thread with a tap.
2. For metal clips:
- 🔧 Use clip remover (sold in auto stores for 200–300 ₽).
- 🔨 If there is no puller, carefully drill the clip in the center with a 2-3 mm drill, then knock it out with a punch.
- ⚠️ Do not try to tear out the clip with pliers - this will deform the hole!
⚠️ Attention: When removing clips from aluminum panels (for example, in Jaguar or Audi A8) never use a hammer! Aluminum is soft and easily deformed. Better to drill out the clip and cut a new thread.
Where to buy clips for self-tapping screws: online vs offline
The choice of where to buy depends on urgency and budget. Let's look at the pros and cons of each option:
1. Car stores (offline)
- ✅ Pros: You can touch the product and immediately check the size.
- ❌ Cons: limited assortment, often stale goods (clips can be fragile from old age).
- 💰 Price: 20–30% more expensive than online.
Where to look: AutoSpetsCenter, IXORA, existential.
2. Online stores
- ✅ Pros: wide selection, fresh batches, customer reviews.
- ❌ Cons: the risk of running into a fake (especially brands Hilti or Fischer).
- 💰 Price: 15–50% cheaper, frequent discounts.
Recommended sites:
- 🛒 Avito — for used clips (for example, after disassembling a car).
- 🛒 Wildberries - budget options (HEYCO, Moll).
- 🛒 220 Volt - professional clips (Hilti, Böllhoff).
3. Disassembly and services
- ♻️ You can find original clips from a specific car model (for example, from BMW E60 or Toyota Camry).
- ⚠️ Risk: Clips may be worn out or rusty.
Check before purchasing online certificate of conformity from the seller. Fake clips are often made from low-quality plastic, which crumbles during installation.
FAQ: Answers to frequently asked questions
Can furniture clips be used for cars?
No, furniture clips (e.g. for IKEA) are not suitable. They are made of soft plastic that does not withstand vibrations and temperature changes. Cars require clips with markings PA66 (nylon) or metal with anti-corrosion coating.
Which self-tapping screw is better: with a press washer or a countersunk one?
Depends on the task:
- 🔧 With press washer - for outdoor work (bumpers, protection), since the washer distributes the load.
- 🔹 Secret - for the interior or places where aesthetics are important (for example, fastening door trim).
What to do if the clip rotates in the plastic?
Solutions:
- Drill out the clip, insert a new one with a larger diameter (for example, instead of 6 mm - 8 mm).
- Pour into the hole epoxy resin or liquid plastic, then screw in the screw.
- Use the clip with threaded insert (for example, Fischer DuoPower).
Do I need to drill a hole for the clip in the new bumper?
No, if the bumper already has technological holes for fastenings. If there are no holes, drill only on the reverse sideso as not to damage the front part. Use drill with depth stop.
What glue can be used to fix the clip?
Suitable options:
- 🔹 Loctite 406 - cyanoacrylate glue for plastic.
- 🔹 3M Scotch-Weld DP100 — two-component epoxy adhesive for metal.
- 🔹 ABRO ES-102 - a budget option for emergencies.
⚠️ Do not use superglue "Moment" - it is fragile and cannot withstand vibrations.