Product Guide
Crusher Hammers vs Blow Bars: Which Wear Part for Which Machine
Last updated September 2026 · By SKS Steel Zambia, Foundry & Machine Shop, Kalulushi
Crusher hammers and blow bars look similar at a glance, both are heavy steel strikers bolted to a rotor, but they belong to different machines and are not interchangeable. Here is how to tell which one your equipment actually needs.
What a Crusher Hammer Does
A crusher hammer hangs on a pivot pin inside a hammer mill rotor, swinging freely rather than being rigidly bolted. As the rotor spins, the hammer swings out and strikes the feed material, using swing momentum in addition to rotor speed to break it apart. This pivoting action lets the hammer flex back slightly on impact with hard or oversized material, which is why hammer mills are common on softer or more variable feed such as limestone, coal, and agricultural material.
How Hammers Differ From Blow Bars
A blow bar is bolted rigidly to the rotor of an impact crusher and does not pivot, striking with the full force of the rotor directly. A crusher hammer pivots on a pin and is used in hammer mills, which generally handle softer material at higher rotor speed. The two are shaped differently, mount differently, and wear differently, a hammer wears mainly at the striking tip, while a blow bar wears along its full striking face. Fitting one in place of the other is not a straightforward swap.
Hammer Mill vs Impact Crusher: Wear Part Comparison
| Factor | Hammer Mill (Crusher Hammer) | Impact Crusher (Blow Bar) |
|---|---|---|
| Mounting | Pivots freely on a pin | Bolted rigidly to the rotor |
| Typical feed | Softer, more variable material: limestone, coal, agricultural | Harder quarried rock |
| Wear pattern | Concentrated at the striking tip | Spread along the full striking face |
| Interchangeable? | No, different mounting and shape | No, different mounting and shape |
How to Confirm Which Part You Need
If you are not sure which wear part your machine takes:
- Check the mounting: if the worn part hangs loosely on a pin, it is a hammer, if it is bolted flat and rigid, it is a blow bar.
- Check your feed material: hammer mills generally run softer, more variable material, impact crushers run harder quarried rock.
- Send us the worn part or its dimensions: we can confirm which type it is and cast a matching replacement without needing an OEM drawing.
For alloy selection background, see our material comparison guide.
Frequently Asked Questions
No. A crusher hammer pivots freely on a pin, while a blow bar bolts rigidly to the rotor. The mounting and shape are different, so one cannot simply replace the other.
Manganese steel is the common choice, since it work-hardens under repeated impact, similar to blow bars and jaw plates. High-chrome iron can suit more abrasive feed depending on your material.
Yes. Send us your worn hammer or its dimensions and we can cast a matching replacement.
Need Crusher Hammers Cast to Fit?
WhatsApp us your mill model or a photo of the worn hammer and we will confirm fit and turnaround, or browse our Crusher Hammers page.