Plum Washer
Plum (corrugated) washers that lock the wing nut against vibration.
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Plum Washer
Heat-treated spring steel washer with a lobed inner profile that bites into the rod thread, maintaining nut preload during concrete vibration. The flower-shaped body also spreads load on the panel. Anti-rust finish; standard sizes for D15/D20 tie rods.
Specifications
- D15 / D20 tie rods
- Lobed thread-gripping profile
- Heat-treated spring steel
- Anti-loosening under vibration
- Anti-rust finish
Prices are quoted based on product specifications, material/grade, quantity, destination and current market conditions. Contact us for the latest quotation.
Engineering-reviewed quote within 24 hours.
Technical Specifications
| Thread | M15 / M20 |
| Material | Heat-treated spring steel |
| Function | Thread-gripping anti-loosening washer |
| Surface | Phosphate / zinc |
| Packaging | Bulk bags |
MaterialQ235 / 45# steel
Surface FinishPlain (black) · Zinc plated
Rated LoadBearing element — rated by system load
Unit WeightSquare washer 120 × 120: 0.98 kg · channel washer 60 × 140: 0.7 kg
PackagingCartons on pallet · marked per BOM
Production Process
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06Material Grades Explained
| Grade | Notes |
|---|---|
| Q235 | Plain carbon steel. Economic option for light and medium formwork loads. Not heat treated. |
| 45# | Medium carbon steel. The standard formwork tie rod grade in China; quenchable to class 8.8. |
| 40Cr | Alloy steel. Higher hardenability and better fatigue performance than 45#; used where repeated reuse matters. |
| Class 10.9 bolt | Quenched and tempered alloy steel bolt used in the climbing cone set. Not electroplated without a documented baking cycle. |
| QT450-10 | Ductile (nodular) iron with 450 MPa tensile and 10% elongation. Used for sleeves and embedded plates where toughness and castability matter. |
| HRB400 | Hot-rolled ribbed bar (threaded steel) to Chinese standard. Used for embedded foot bolts; good bond with concrete. |
Applications
Procurement Guide
- Use one washer per nut on vibration-exposed joints
- Confirm inner hole matches rod diameter
- For HDG rods, choose zinc washers to avoid galling
Procurement Information
- OEM / Custom
- Own drawing or label welcome
- MOQ
- Trial orders OK · mixed SKU welcome
- Lead time
- Stock 3d · Custom 7-15d
- Packaging
- Seaworthy: pallet + strapping + waterproof
- Payment
- T/T · L/C at sight
- Incoterms
- FOB Tianjin · CIF · CFR · EXW
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Technical FAQ
Plum Washer — Answers for Engineers and Buyers
Tie spacing is governed by the maximum lateral pressure of fresh concrete, which depends on pour rate, concrete temperature, slump and wall height, plus the allowable load of the rod, the waler and the panel facing. Spacing must be calculated per pour, not copied from a previous project.