Combination Nut (Butterfly)
Butterfly nut combined with disc for one-piece tie rod fastening.
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Combination Nut (Butterfly)
A butterfly nut combined with an integrated disc, giving a one-piece fastener for tie rods. Fewer parts on site and faster assembly than separate nut and washer.
Specifications
- One-piece nut and disc
- Butterfly hand tightening
- Fits D15 / D20 threads
- Reduces parts count
Engineering-reviewed quote within 24 hours.
Technical Specifications
| Thread | D15 / D20 |
| Material | 45# steel / cast |
| Surface | Zinc plated / black |
Material45# steel / cast
Surface FinishZinc plated · Black
Rated LoadInquire
Unit WeightInquire
PackagingCartons on pallet
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
- Confirm thread size
- Order to reduce on-site parts
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
Combination Nut (Butterfly) — 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).