M6 Mudguard Yellow Zinc Washers Catalog for Auto | OEM
M6 Mudguard Yellow Zinc Washers Catalog for Auto | OEM Supply
Engineered for automotive OEMs & tier‑1 suppliers — corrosion‑proof yellow zinc M6 mudguard washers that reduce assembly rejects by 23% and cut per‑unit cost by 31% compared to traditional zinc‑plated alternatives.
⚙️ 350M+ washers produced annuallyWhy Standard Washers Fail in Automotive Mudguard Applications
For OEM buyers and procurement managers, every fastener failure means warranty claims, line stoppages, and reputational risk. Here are the five most costly pain points we hear from auto‑supply chains:
Premature Corrosion
Standard clear zinc fails after 72h salt spray. Yellow zinc lasts 240+ hours — yet many suppliers still cut corners.
Inconsistent ID/OD
M6 mudguard washers with loose tolerances cause rattling, paint peel, and rework. 23% of field returns trace back to washer geometry.
High Shipping Cost
Overseas suppliers often ship low‑density packs, wasting container space. +18% freight vs. optimized packaging.
Missing Certifications
Many importers lack IATF 16949 or ISO 9001, forcing OEMs to re‑qualify. $2,700+ per new supplier audit.
Late Delivery
Lead times of 8–12 weeks from some Asian mills create inventory gaps. 31% of procurement managers report line stoppages due to fastener delays.
🔩 Boen Fastener M6 Mudguard Yellow Zinc Washers — OEM‑Grade Precision
Our M6 mudguard washers with yellow zinc finish are engineered to meet the most demanding automotive corrosion and dimensional standards. Every batch is traceable, tested, and certified.
✅ Core Advantages
- 🔹 Yellow zinc passivation — 240–360 h salt spray (ASTM B117)
- 🔹 M6 ID: 6.4 ±0.1 mm — snug fit on M6 studs, no wobble
- 🔹 OD: 18–22 mm options — mudguard‑specific load distribution
- 🔹 Grade 8.8 / 10.9 — high‑strength carbon steel, 10‑μm zinc layer
- 🔹 100% dimensional inspection — CMM & go/no‑go gauges per batch
- 🔹 OEM packaging — bulk, poly‑bag, or custom label with barcode
📊 Technical Specifications — M6 Mudguard Washer
| Parameter | Value | Standard |
|---|---|---|
| Inner Diameter (ID) | 6.4 ± 0.1 mm | DIN 125 / ISO 7089 |
| Outer Diameter (OD) | 18.0 / 20.0 / 22.0 mm | OEM spec |
| Thickness | 1.6 / 2.0 / 2.5 mm | DIN 125A |
| Material | Carbon steel C45 / 10B21 | EN 10083 |
| Coating | Yellow zinc (Zn + Cr3+ passivation) | ASTM B633 SC2 |
| Salt Spray Resistance | ≥ 240 h (red rust) | ASTM B117 |
| Hardness | 300–350 HV | ISO 6507 |
| Packing | 1,000 / 2,000 / 5,000 pcs per bag | Per buyer request |
📌 Custom OD, thickness, and packaging are available for OEM programs. Minimum order quantity: 50,000 pcs for custom sizes.
🚗 Application Scenarios
🏭 Trusted by Automotive & Industrial OEMs Worldwide
📸 Dedicated yellow zinc plating line, Handan facility
+ 26 more OEM clients
✅ IATF 16949 pending audit
“Switched to Boen’s M6 yellow zinc washers for our mudguard line. Coatings failure dropped 37%, and the dimensional consistency ended our fitment issues. Reliable 4‑week lead time.”
“We were paying 42% more for domestic washers. Boen’s factory‑direct pricing and yellow zinc quality beat our previous supplier on both cost and salt spray performance.”
“The tech spec table they provided matched our internal validation perfectly. Zero non‑conformance in the first 150,000 pcs. We’ve now listed them as an approved supplier.”
❓ Frequently Asked Questions — M6 Mudguard Yellow Zinc Washers
1. What is the difference between yellow zinc and clear zinc for M6 mudguard washers?
Yellow zinc (Cr3+ passivation) provides 3–5× better salt spray resistance than clear zinc. For automotive mudguard applications exposed to road salt and moisture, yellow zinc is the industry standard. Our M6 mudguard washers achieve 240+ hours to red rust per ASTM B117.
2. Can you provide OEM custom packaging with our logo?
Yes — we offer custom poly‑bag, box, and barcode labeling. For OEM programs, MOQ: 50,000 pcs per SKU. Lead time for custom packaging is 10–14 days after approval.
3. What shipping methods do you use for export to the USA / Europe?
We ship via FOB Tianjin / Shanghai or CIF major ports (Hamburg, Rotterdam, Los Angeles). Typical transit: 25–32 days sea freight. Air freight available for urgent orders. We consolidate shipments to reduce container cost by up to 18%.
4. Do you offer free samples for quality evaluation?
Absolutely. We provide free samples (10–20 pcs) with you covering shipping. Sample lead time: 3–5 days. We also share test reports and dimensional data for your engineering team to review.
5. What is the typical lead time for a 500,000‑pc order of M6 washers?
Standard production lead time is 18–22 working days after deposit. For repeat orders, we can reduce to 14 days. We maintain a buffer stock of 2M pcs of raw material for fast turnaround.
6. Do you have IATF 16949 certification?
We are currently ISO 9001:2015 certified and in the final stage of IATF 16949 certification (expected Q2 2026). In the meantime, we meet all customer‑specific requirements with full PPAP documentation.
7. Can you supply washers for both metric and imperial mudguard studs?
Our standard M6 mudguard washers are metric. For imperial sizes (e.g., 1/4″), we offer custom tooling with a 30‑day lead time. Contact our engineering team for a feasibility review.
8. What payment terms do you offer for OEM buyers?
We accept T/T (30% deposit, 70% before shipment), L/C at sight, and for established OEM partners, net‑60 terms. We also support USD and EUR invoicing.
⭐ Real Feedback from Automotive & Industrial Buyers
“We evaluated three suppliers for M6 mudguard washers. Boen’s yellow zinc finish outperformed the rest in both salt spray and dimensional repeatability. Cost savings of 28% vs. our European supplier, without any quality compromise.”
“The yellow zinc washers arrived earlier than quoted, and the PPAP documentation was flawless. We’ve now standardized on Boen for all M6 mudguard applications across three plants.”
“Technical support was outstanding — they adjusted the OD to 21 mm for our specific mudguard bracket. Zero defects in 220,000 pieces delivered. Will order again.”
💬 Real‑Time Support — What Our Clients Say
📸 Live chat screenshots from recent OEM inquiries — response within 2 hours during business hours.
James Lin — Senior Fastener Engineer, Boen Fastener
With 14 years in fastener R&D and quality management, James has overseen over 1,200 OEM washer programs for automotive, agricultural, and construction clients across 30 countries. He leads Boen’s technical compliance team and is a member of the American Fastener Institute (AFI).
✉️ shuan@fastenboen.com | 📞 +86 15630072814
🚀 Ready to Secure Your M6 Mudguard Washer Supply?
Get a factory‑direct quote within 24 hours. Free samples, PPAP support, and dedicated account management.
🔒 Risk‑free: Free samples + 30‑day money‑back guarantee on first order. Limited‑time: free DDP shipping for first 3 OEM trials.
