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
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
Accessory Weights
| Name | Spec | Weight | Material | Surface |
|---|---|---|---|---|
| Tie rod (high strength) | D15 × 1000 | 1.5 kg | Q235 · 45# · 40Cr | Black / zinc / HDG |
| Tie rod (high strength) | D20 × 1000 | 2.6 kg | Q235 · 45# · 40Cr | Black / zinc / HDG |
| Tie rod section | D15 × 250 | 0.375 kg | 45# | Black / zinc |
| Wing nut (shanxing nut) | D15 | 0.32 kg | 45# / QT450-10 | Black / zinc |
| Wing nut (shanxing nut) | D20 | 0.8 kg | 45# / QT450-10 | Black / zinc |
| Connecting nut | D20 × 110 | 0.8 kg | QT450-10 / 45# | Zinc plated |
| Disc nut | D20 × 50 × 110 | 0.92 kg | QT450-10 | Black / zinc |
| Disc (round plate) | D15 × 100 | 0.53 kg | Q235 / 45# | Black |
| Square washer | 120 × 120 | 0.98 kg | Q235 | Black / zinc |
| Channel washer | 60 × 140 | 0.7 kg | Q235 / 45# | Black |
| Embedded plate | D20 × 67 × 96 | 0.6 kg | QT450-10 | Black / zinc |
| Cone (climbing) | D20 × 33 × 59 × 110 | 0.93 kg | 45# | Black / zinc |
| Waler fastener (backing plank clip) | D15 / 10# | 0.55 kg | 45# | Black / quenched version |
| Embedded foot bolt (single-sided) | D25 × 700 | 2.4 kg | HRB400 ribbed bar | Black / zinc |
| Hex nut | D15 / across-flats 23-25 | — | 45# | Black / zinc |
| Hex nut (tall) | D15 / height 37 / AF 25 | — | 45# | Black / zinc |
| Hex nut | D15 / across-flats 50-25 | — | 45# | Black / zinc |
| Hex nut | D20 / across-flats 23-31 | — | 45# | Black / zinc |
| Hex nut | D20 / across-flats 50-32 | — | 45# | Black / zinc |
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 7-30d · Custom 20-35d
- Packaging
- Seaworthy: pallet + strapping + waterproof
- Payment
- T/T · L/C at sight
- Incoterms
- FOB Tianjin · CIF · CFR · EXW
Related Technical Reading
Related Products
Technical FAQ
Plum Washer — Answers for Engineers and Buyers
A formwork tie rod is a high-strength threaded bar that, together with nuts, anchor plates and walers, holds formwork panels against the lateral pressure of fresh concrete. It passes through the wall section and is either fully recovered after stripping (through-tie used with a sleeve) or permanently embedded (lost-end / water-stop type).