---
description: Genuine Ronda 5021/5030/5040 winding stem (3000.177), Swiss made, 0.90mm, fits 5021/5030/5040/5010/5050/5130, requires cutting to case length.
title: Ronda Caliber 5021/5030/5040 Winding Stem - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/05/5030.jpg
---
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- **Ronda Caliber 5021/5030/5040 Winding Stem**
[](https://www.soflypart.com/wp-content/uploads/2019/05/5030.jpg)
# Ronda Caliber 5021/5030/5040 Winding Stem
$1.00
You Saved
| Brand | Choose an option Ronda- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.00 |
| 3 - 4 | 5% | $0.95 |
| 5 - 9 | 7% | $0.93 |
| 10 - 14 | 10% | $0.90 |
| 15+ | 15% | $0.85 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.00 |
| 3 - 4 | 5% | $0.95 |
| 5 - 9 | 7% | $0.93 |
| 10 - 14 | 10% | $0.90 |
| 15+ | 15% | $0.85 |
Ronda Caliber 5021/5030/5040 Winding Stem quantity
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## Product Description
This is a **genuine Ronda winding stem** for the **5021/5030/5040 movements**, **Swiss made**, designed for the **Startech 5000 series 12½ ligne chronograph calibers**. It serves as the **critical component connecting the crown to the keyless works** for **time setting, date quickset, and chronograph function control**. Featuring **Tap 10 (0.90mm)** specification, this product is **brand new and original**, and typically requires cutting to case length during installation.
## Specifications
- **Part Number**：**3000.177**（Ronda）/ **982004015000**（Boley）
- **Compatible Movements**：**Ronda 5010.B, 5020.B, 5021.D, 5030.D, 5040.B, 5040.D, 5040.E, 5040.F, 5050.B, 5050.C, 5130.B, 5130.D**
- **Origin**：**Swiss Made**
- **Thread Diameter**：**0.90mm**
## FAQ
**1. Is this winding stem an original Ronda genuine part?**
**Yes**.
**2. Which movements is this stem compatible with?**
It fits **5021.D, 5030.D, 5040.B/D/E/F** and related **5010, 5020, 5050, 5130** Startech chronograph calibers. All these movements feature **chronograph function and date display**.
**3. Does the stem need to be cut during installation?**
The stem is supplied at a general length and **must be cut to fit the specific case length** before attaching the crown. Both standard (20mm) and long (32mm) versions are available. This should be performed by a **qualified watchmaker**.
## Why Choose SOFLY Watch Parts?
**Fast Worldwide Shipping** – Orders are dispatched within 3 business days.
**Competitive Pricing** – Great value across watch movements, replacement parts and watchmaking tools.
**Extensive Selection** – More than 3,000 watch movements, parts and accessories available.
**Trusted Worldwide** – Trusted by watchmakers, repair professionals and watch enthusiasts worldwide.
**Personalized Sourcing** – Can’t find the part you need? Contact **info@soflypart.com** or WhatsApp **+86 18620212114.**
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