A ball-peen hammer (also spelled ball-pein) is a hand tool with a dual-purpose head: one flat striking face and one rounded, ball-shaped peen on the opposite side. It is primarily used for metalworking tasks such as shaping, peening, and riveting.
Anatomy of a Ball-Peen Hammer
- Flat face — the primary striking surface, used for driving punches, chisels, and general hammering on metal
- Ball peen — the rounded end, used for shaping sheet metal, closing rivets, and rounding off edges
- Head — typically forged from high-carbon steel, hardened and tempered for durability
- Handle — traditionally hickory wood; modern versions may use fibreglass or steel with a rubber grip
- Eye — the opening in the head through which the handle passes, secured with a wedge
Common Sizes
Ball-peen hammers are classified by head weight:
- 115 g (4 oz) — light work, jewellery, and precision tasks
- 225 g (8 oz) — general-purpose bench work
- 340 g (12 oz) — medium metalworking tasks
- 450 g (16 oz) — heavier forming and riveting
- 680 g (24 oz) and above — heavy industrial work
Uses in Construction
- Riveting — the ball peen spreads the end of a rivet to form a smooth, rounded head
- Metal shaping — forming curves and contours in sheet metal
- Striking punches and chisels — the flat face drives cold chisels, centre punches, and drift pins
- Straightening — flattening bent metal components
Application
Ball-peen hammers are found in workshops, fabrication shops, and on construction sites wherever metalwork is involved. Common applications include:
- Structural steelwork and steel erection
- Plumbing and pipefitting
- HVAC ductwork fabrication
- Blacksmithing and ornamental ironwork
- General maintenance and repair
Unlike a claw hammer, a ball-peen hammer is not designed for driving or pulling nails. It is a metalworker’s tool first and foremost.
Related Terms
- Claw hammer
- Sledgehammer
- Cross-peen hammer
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