Wheel Nut Indicator Standard Flat Ring Style - Fluoro Yellow - 21mm - (25 Pack)

21mm Fluoro Yellow Wheel Nut Indicators 25 pack loose. Specially designed for 21mm wheel nuts on steel rims.

Streamline your pre-start checks with our flat ring Wheel Nut Indicators. Designed for easy visual inspection, these indicators provide a quick and reliable way to identify loose or missing wheel nuts. Save time and ensure a thorough inspection process for your fleet of vehicles.

Our Fluoro Yellow Wheel Nut Indicators are not just bright—they're tough too. Manufactured using polyethylene and durable construction for long-lasting security. With a 120℃ melting point, these indicators can help you detect potential wheel safety issues before they escalate.

When installed in a uniform pattern, misalignment to the pattern will indicate a loose wheel nut. Damaged, warped or melted indicators may mean overheating issues and missing indicators may mean lost, broken or stripped studs or nuts.

Installation pattern reference: See the installation pattern diagram in the image gallery above, showing the three common layouts — inward, single‑file, and point‑to‑point — including examples of correct fitment and how movement indicates loosening.

Request a Bulk Quote - Fast response within 24 hours — tailored pricing for fleet managers and vehicle hire companies.

Specification

• Dimensions: A=46mm B=31mm C=6mm
• Unit Weight: 1.7gram
• Material: Polyethylene
• Melting Point: 120℃/ 248℉
• Standard Colour: Fluoro Yellow

*All Available Sizes in the Standard Series (mm): 19mm, 20mm, 21mm, 22mm, 27mm, 32mm, 33mm, 34mm, 38mm, 41mm

Wheel Nut Indicator Standard Series (WNIS): WNIS19, WNIS20, WNIS21, WNIS22, WNIS27, WNIS32, WNIS33, WNIS34, WNIS38, WNIS41

Fitment and Measurement Guide

Suitable for larger SUVs, heavy‑duty 4×4 vehicles, vans and medium trailers fitted with steel rims. Commonly used where stronger wheel assemblies are required for heavier loads. Always check your wheel‑nut hex size before ordering.

How To Measure

Measure across the flats (A/F) with a vernier caliper, or check the socket size that fits your wheel nut — both methods give you the correct hex size.

Will dispatch ASAP (usually same business day) by Australia Post via Standard or Express Post option.