Factory Price Carbon Steel DIN125 White Zinc Plated Grade 4.8 Flat Washer

If you work with anchors, bolted joints, or steel assemblies, you’ve already met the Plain Washer Din 125. It’s the quiet hero under the nut—distributing load, protecting the surface, and yes, saving you from avoidable call-backs. I’ve seen spec sheets argue for pages about coatings, yet the humble washer makes or breaks a joint’s repeatability. Funny how that happens.

What it is, and why it still matters

This model—carbon steel, white zinc plated—follows DIN 125 Type A geometry (thin, bright, consistent). In modern projects, many specs now cross-reference ISO 7089/7090, but field users still call it Plain Washer Din 125 out of habit. Fair enough; it’s the same family and the fit is what counts.

Core specifications (shop-floor friendly)

Process flow, testing, and real QC

Process (as actually run on good lines): coil slitting → stamping/punching → deburring & tumble → oil clean → plating (alkaline or acid Zn) → passivation → bake if specified (hydrogen relief) → 100% visual + AQL sampling → gauge checks (ID/OD/thickness) → hardness sampling → coating thickness → salt spray (as required) → packing (bulk/box, pallet).

Typical acceptance references: ISO 3269 lot inspection, ISO 4042 for coating, ISO 9227 for NSS. Certifications customers request: ISO 9001, RoHS/REACH, and a simple CoC. Many customers say they also want PPAP Level 2 for automotive, which is doable with notice.

Where it’s used

• Building & MEP: anchors, channel, threaded rod assemblies.
• General machinery and skid packages—spread load, protect paint.
• Solar racking and HVAC frames (indoor/outdoor; check coating class).
• Electrical cabinets—nice, clean seating under nuts and screws.

Vendor landscape (quick comparison)

Customization & notes from the field

Options: special OD, thickness, stamping, blue zinc or black oxide, HDG for coastal sites, bagging/labeling by drawing. One contractor told me they cut install time by standardizing on Plain Washer Din 125 packs pre-kitted with nuts/bolts—simple idea, surprisingly effective.

Mini case study

A solar EPC in Southeast Asia switched to white-zinc Plain Washer Din 125 for indoor inverter rooms and HDG outside. Result: fewer repaint defects and a cleaner torque signature on re-tightening after 90 days. The inspector’s comment—“no crushed paint, no wobble”—pretty much sums it up.

Origin & availability

Made in Hebei, China: No. 40, Zhuoju Road, Dongmingyang Industrial Park, Mingguan Town, Yongnian District, Handan City, Hebei Province China. Stock runs are steady; larger diameters may need a short run-up (I guess that’s normal anywhere).

Testing snapshot

Recent lab pulls I’ve seen: zinc thickness 8–10 μm avg (XRF), NSS 96 h to first white rust, adhesion OK per tape test; dimensions within DIN limits. Real-world use may vary—always match coating to environment.

References

1. ISO 7089: Plain washers — Normal series
2. ASTM B633: Electrodeposited coatings of zinc on iron and steel
3. ISO 9227: Corrosion tests in artificial atmospheres — Salt spray tests
4. ISO 4042: Fasteners — Electroplated coatings