Description
Overview:
The Rammer Stem 32mm for Heavy Breakers is a high-strength internal component designed for handheld construction breakers in the Atlas Copco range. Referenced by OEM number 912903, it supports and guides the impact mechanism to keep your breaker striking efficiently under continuous use. Built from tough, heat-treated alloy steel with a protective finish, it is sized to match common 32 mm systems and is engineered for demanding demolition and roadwork tasks. Key dimensions include a 32 mm diameter body, a 1 1/4 in (31.75 mm) hex shank for secure drive engagement, and precision tapers of 42 mm (top) and 47 mm (bottom). It is a direct-fit service part for models such as Cobra Mk1 and Cobra TT, helping restore performance and reduce downtime.
Key Features:
- 32 mm diameter body with 1 1/4 in (31.75 mm) hex shank for positive tool retention and drive
- Top taper 42 mm and bottom taper 47 mm for accurate seating and alignment
- OEM-equivalent geometry for Atlas Copco reference 912903 to ensure correct fit
- Tough, heat-treated alloy steel for wear resistance and long service life
- Precision-machined surfaces to minimise play, vibration, and premature wear
- Protective finish to help resist corrosion in wet or gritty site conditions
- Direct replacement on compatible Cobra breakers; no modification required
- Supports high impact loads typical of concrete and asphalt breaking
- Helps maintain consistent impact energy and reduce unplanned downtime
- Straightforward to install during routine service or overhaul
Typical Applications:
Used in general demolition, breaking concrete slabs, cutting road surfaces and asphalt, utility openings, fence and post driving, and maintenance work around highways and building sites. Suitable for daily site use where a compact, handheld breaker must deliver reliable impact performance.
Also known as:
Sometimes referred to as an impact stem, hammer stem, striker rod, centre rod, rammer bar, or shank stem. These terms describe the same internal breaker component that transfers impact force within the tool assembly.
Fits Models:
COBRATT, Cobra Mk1, Cobra TT
Alternate Part Numbers:
912903
Product Specifications
| L&S Part No. | 912903 |
|---|---|
| Manufacturer | Atlas Copco |
| OEM No. | 3083328700 |
| Unit of Sale | 1 |
| Applications | COBRATT, Cobra Mk1, Cobra TT |
| Machine Type | Breakers |
| Fits Brands | Belle |
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