Mud flaps are not just a decorative element, but an important part of protecting the body from dirt, stones and moisture. However, their reliable fixation often becomes a headache for car owners. Standard plastic pistons break over time, and self-tapping screws without proper fastening tear holes in the arches, turning them into centers of corrosion. Solution to the problem - clips for self-tapping screws for mudguards, which combine the strength of metal fasteners with respect for the paintwork.

In this article, we will look at what types of clips exist, how to choose them correctly for a specific car model, and why cheap analogues can result in expensive repairs. You will also learn step-by-step installation instructions, secrets to long-lasting fasteners, and answers to frequently asked questions. The material will be useful for both beginners and experienced car enthusiasts who want to avoid common mistakes when working with body parts.

Why do we need clips for self-tapping screws for mudguards?

Many car owners ask the question: why can’t they just screw a self-tapping screw into the plastic or metal of the arch? The answer lies in three key issues:

  • 🔧 Corrosion: a self-tapping screw screwed directly into the metal breaks the protective layer of paint and primer, allowing moisture to enter. After 1-2 seasons, rust appears at the attachment point.
  • 💥 Plastic cracking: Mudguards made of ABS or polypropylene become brittle due to temperature changes. A self-tapping screw without a clip eventually “looses” the hole and the fastener falls out.
  • 🔄 Difficulty in dismantling: if you need to remove the mudguard (for example, for painting or replacement), it is almost impossible to unscrew the “bare” screw without damaging the paintwork.

Clips solve all these problems by:

  • 🛡️ Protective barrier: A rubber or plastic gasket on the clip seals the hole, preventing water from entering.
  • 🔩 Load distribution: The self-tapping screw is screwed into the metal or reinforced base of the clip, and not into the fragile plastic of the mudguard.
  • ⚙️ Reusable: high-quality clips can withstand 5–7 installation/removal cycles without loss of properties.
📊 How do you attach mud flaps to your car?
Self-tapping screws directly into the body
Clips for self-tapping screws
Plastic pistons
Another way

Types of clips for self-tapping screws: what they are and how they differ

There are more than 15 types of clips on the market, but only 4 main categories are relevant for mudguards. Their choice depends on the material of the arch, the type of mudguard and operating conditions.

Clip type Material Benefits Disadvantages Application
Metal with rubber gasket Galvanized steel + EPDM rubber Maximum strength, corrosion resistance, long service life (10+ years) High price, difficult to install in hard-to-reach places SUVs, commercial vehicles, aggressively driven vehicles
Plastic reinforced Polyamide with metal insert Lightweight, do not rust, easy to install Less reliable in case of strong vibrations, may break in frosts below -30°C Passenger cars, city use
Combined (plastic + rubber) Polypropylene + thermoplastic elastomer Versatility, vibration resistance, average price Average lifespan (3–5 years), can “tan” in the cold Most sedans and hatchbacks
Self-adhesive Aluminum/plastic + 3M glue No drilling, quick installation Unreliable when washed under high pressure, falls off at -20°C Temporary fastening, rented cars

They stand apart adjustable angle clips (for example, Heco Schraubdom M6 or Uxcell a18082600ux0348). They allow you to compensate for body unevenness and perfectly fit the mudguard to the contour of the arch. Such models are indispensable for tuned cars or cars after an accident, where the geometry of the body is damaged.

⚠️ Attention: Clips with external thread (for example, M5 or M6) require pre-drilling a hole of the exact diameter. If you take a drill 0.1–0.2 mm larger, the clip will dangle, and if it is smaller, it will split the plastic when screwed in.

How to choose clips for a specific car model

There are no universal clips - even one car model may require different types of fastenings on the front and rear arches. Here is the selection algorithm:

  1. Study the factory documentation: in the repair manual (for example, ETKA for Volkswagen or EPC for Mercedes) the original part numbers of the clips are indicated. For Toyota Corolla E210 it could be 90467-08063 (before) and 90467-08064 (back).
  2. Inspect old fasteners: If the mudguards were already in place, take a photo of the back of the clips. They often bear manufacturer's markings (for example, ITW, Panduit, HellermanTyton).
  3. Consider the arch material:
    • 🚗 For steel arches, metal clips with rubber are suitable.
    • 🛻 For aluminum (for example, Audi A8 or Jaguar XJ) require anodized clips to avoid galvanic corrosion.
    • 🔋 For plastic arches (for example, BMW i3) - only plastic or self-adhesive options.
  • Check the diameter of the screw: clips are designed for a specific thread - M4, M5 or M6. Self-tapping screw M6 in the clip under M4 it just won't screw in, but M4 in M6 will hang out.

    • To simplify the task, use the spare parts catalogs:

    💡

    If you cannot find original clips, look for analogues by thread pitch and cap diameter. For example, a clip ITW 25008000 interchangeable with Panduit PLT2.5-6-BLK for most European cars.

    Step-by-step instructions for installing clips for self-tapping screws

    Installing the clips requires care - one mistake can lead to chipped paint or a crack in the mudguard. Follow this algorithm:

    Remove the mudguard and clean the arch from dirt|Check the integrity of the paintwork at the fastening points|Select a drill to the diameter of the clip (see table below)|Seal the drilling area with masking tape to protect it from chipping-->

    Step 1. Marking and drilling

    • Apply marks with a center punch at the locations of future holes. For accuracy use template (can be cut out of cardboard in the shape of a splash guard).
    • Drill at low speed (300–500 rpm) with cooling (machine oil for metal, water for plastic). The diameter of the drill should be 0.1–0.2 mm less than the diameter of the clip.
    • For aluminum arches use step drill to avoid burrs.

    Step 2. Installing clips

    • For metal clips: insert the clip into the hole and press it in until it stops with light blows of a hammer through a wooden block. The rubber gasket should fit tightly to the body.
    • For plastic clips: Screw them in with a screwdriver until they click. Do not overtighten - the plastic may burst!
    • For self-adhesive: degrease the surface isopropyl alcoholAfter removing the protective layer from the adhesive base, press the clip for 30 seconds.

    Step 3. Attaching the mudguard

    • Check the alignment of the mudguard holes and clips. If necessary, adjust the position of the clips with pliers.
    • Screw in the screws with a force of 1.5–2 Nm (use torque screwdriver, if any). Over-stretching leads to deformation of the plastic!
    • After installation, treat the seams silicone grease (for example, CRC 5-56) to protect against moisture.
    Clip diameter Recommended drill Screw tightening torque Self-tapping screw type
    M4 3.3 mm 1.2 Nm Self-tapping screw for metal 4.2×16 mm
    M5 4.2 mm 1.8 Nm Self-tapping screw for metal 5×20 mm
    M6 5.0 mm 2.5 Nm Bolt M6×25 mm with washer
    ⚠️ Attention: If you hit an arch cavity while drilling (for example, a bumper reinforcement), use clips with an enlarged head (for example, ITW 25008001) or put rubber washer with a diameter of 20 mm. This will prevent the fastener from failing.

    Top 5 clip manufacturers: who to choose?

    The quality of the clips directly affects the durability of the fastening. Cheap Chinese analogues (NoName or Autostyle) often break during the first winter wash. We tested 12 brands and compiled a reliability rating:

    1. ITW (Germany)

      Leader in quality for premium cars. Clips series 25008 and 25010 used on conveyors BMW, Mercedes and Audi. Average price: 120–250 rubles/piece. The only manufacturer that gives a guarantee on rubber gaskets (5 years).

    2. Panduit (USA)

      Specializes in plastic clips for American and Japanese cars. Model PLT2.5-6-BLK is the best choice for Toyota Camry and Honda CR-V. Price: 80–150 rub/piece.

    3. HellermanTyton (Poland)

      Optimal price/quality ratio. Clips HT-6MM suitable for Skoda Octavia and Volkswagen Passat. Price: 60–100 rub/piece. The downside is the limited range for aluminum bodies.

    4. Uxcell (China, premium line)

      Not to be confused with cheap fakes! Ruler a18082600ux certified by ISO 9001 and supplied to the secondary market Hyundai and Kia. Price: 40–70 rub/piece.

    5. NPP "Plastmass" (Russia)

      The best domestic manufacturer. Clips PK-5 and PK-6 adapted to harsh climates (tested at -40°C). Price: 30–50 rub/piece. Suitable for Lada Vesta and GAZelle Next.

    How to distinguish an original ITW clip from a fake?

    Original ITW clips have:

    1. Manufacturer's logo on the cap (engraved, not glued on).

    2. A black rubber gasket with a matte finish (for fakes it is shiny and smells of chemicals).

    3. Packaging with a hologram and an article that matches the ETKA catalogue.

    4. Certificate of conformity TÜV SÜD (can be checked by the QR code on the package).

    Common installation mistakes and how to avoid them

    Even experienced craftsmen make mistakes that reduce the service life of clips by 2-3 times. Here are the most common mistakes and ways to prevent them:

    • 🔨 Drilling by eye:

      Consequences: the self-tapping screw does not fit into the clip, the mudguard hangs crookedly.

      Solution: use drilling jig (for example, KWT 11330000) or a cardboard template.

    • 💦 Ignoring sealing:

      Consequences: corrosion of the body under the clip after 1–2 years.

      Solution: apply anti-corrosion mastic (for example, Dinitrol 479) onto the thread of the self-tapping screw before screwing it in.

    • ❄️ Installation at sub-zero temperatures:

      Consequences: Plastic clips become brittle and break when tightened.

      Solution: Warm the clips with a hairdryer (temperature 40–50°C) before installation.

    • 🔧 Using rusty screws:

      Consequences: the clip “sticks” to the screw and breaks when dismantled.

      Solution: take screws from zinc or chrome plated coating (marking A2-70 or A4-80).

    💡

    Always check before installing clips body thickness at the point where the caliper is attached. If it is less than 0.8 mm (for example, on Dacia Sandero), use clips with increased support platform (for example, ITW 25008002).

    Alternative methods of attaching mudguards: pros and cons

    Self-tapping clips are not the only option. Let's look at the alternatives and their features:

    Mounting method Pros Cons Cost (for 1 mount)
    Plastic pistons Quick installation, no drilling They break during dismantling and cannot withstand vibration 10–20 rub.
    Double-sided tape (3M VHB) No damage to the body, sealed Falls off when washed under pressure >120 bar 50–80 rub.
    Rivets Strength, durability Irreversible installation, requires a riveter 30–60 rub.
    Clips for self-tapping screws Versatility, reusability, reliability Requires drilling, high price 60–250 rub.

    Suitable for temporary mounting (for example, on a rented car) double-sided tape 3M VHB 4950. It can withstand loads of up to 15 kg/cm² and can be removed without leaving marks if heated with a hairdryer. However, for permanent use Self-tapping clips remain the best choice — they withstand vibrations, high-pressure washing and temperature changes.

    If you need a "forever" mount (for example, for an SUV), consider aluminum rivets with sealant Loctite 577. This method is used on rally cars, where the mudguards are subject to extreme loads.

    FAQ: Answers to frequently asked questions

    Is it possible to use clips from one car model to another?

    Theoretically yes, but only if they match:

    • Diameter of the hole in the arch.
    • Thickness of the body at the attachment point.
    • Self-tapping thread type (M4, M5, M6).

    For example, clips from Volkswagen Golf IV (1J0 825 251) suitable for Skoda Octavia A4, since they have the same platform. And here are the clips from Toyota Corolla not suitable for Renault Logan due to the different geometry of the arches.

    How to remove the clip if the screw is stuck?

    Procedure:

    1. Treat the threads with penetrating lubricant (WD-40 or Liqui Moly MoS2-Spray).
    2. Heat the clip with a hair dryer (temperature 60–80°C) for 2–3 minutes.
    3. Use impact screwdriver or extractor for self-tapping screws (for example, Knipex 97 52 04).
    4. If the screw is broken, drill it with a drill 0.5 mm smaller than the thread diameter, then tap a new hole.

    ⚠️ Do not use an angle grinder - the sparks will damage the paintwork!

    How many clips are needed to attach one mudguard?

    The quantity depends on the car model:

    • Passenger cars (for example, Hyundai Solaris): 4–6 clips (2–3 for each arch).
    • Crossovers (for example, Toyota RAV4): 6–8 clips.
    • SUVs (for example, Nissan Patrol): 8–12 clips + additional rivets.

    The exact quantity is indicated in the repair instructions (section Body Repair Manual).

    Can the clips be painted to match the body color?

    Yes, but with reservations:

    • Metal clips can be painted powder paint (for example, PPG Envirobase) after defatting.
    • Plastic clips are painted acrylic varnish (for example, Motip Dupli-Color), but it peels off over time.
    • Rubber gaskets cannot be painted - this will ruin their elasticity.

    To select an exact color, use the paint code of your car (listed on the plate under the hood).

    How often should I check the condition of the clips?

    Recommended schedule:

    • Every 10,000 km or before a seasonal tire change: visual inspection for cracks.
    • Every 30,000 km: check the tightening torque of the screws (must correspond to the table above).
    • After each high-pressure wash: check for tightness (whether there is water under the clips).

    Signs of clip wear:

    • The mudguard "walks" when pressed.
    • Appearance of rust around the fastening.
    • Cracks on the plastic part of the clip.