Hammers
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Frequently asked questions
What does 500 g or 1 lb on a hammer refer to?
It is the head mass, excluding the handle. Engineer's hammers of 300 to 500 g suit punching and pinning; 1 to 2 kg suits heavy assembly work. Using too heavy a hammer for small jobs distorts parts and tires the user.
When should I use plastic, rubber or dead blow hammers?
Plastic or brass faced hammers are used where machined surfaces must not be marked, such as fitting shafts or setting fixtures. Dead blow hammers contain steel shot that cuts rebound and delivers force more evenly. Soft rubber mallets suit thin sheet and fragile parts.
Why must two steel hammer faces never be struck together?
Steel hammer faces are hardened, and hardened steel striking hardened steel can throw chips. Do not use a hammer with a cracked, chipped or mushroomed face; replace the head and wear eye protection when striking.
How do wood, fiberglass and steel handles differ?
Wood handles absorb vibration well but can shrink and loosen the head in hot, humid conditions. Fiberglass handles are durable and less affected by moisture. One-piece steel handles are strongest but transmit more vibration to the hand.
How does a brass hammer differ from a steel one on parts?
Brass is softer than hardened steel, so it does not mark steel parts and does not spark when striking, which suits areas with flammable vapor. Brass faces deform over time and need replacing. Steel hammers deliver more concentrated force, suiting pins, chisels and punches.
How do I tell a loose hammer head and what should be done?
A head that turns or shifts on the handle, a visible gap at the eye, or a dull sound when striking indicates looseness. A loose head can fly off, so stop using the hammer at once. Wood handles need re-wedging or a new handle, while one-piece hammers should be replaced whole.
Where should a hammer strike a part to avoid damage?
Do not strike shaft ends, bearing edges or threads directly; use a brass drift, sleeve or bearing fitting tool to spread the force. The face should meet the target squarely and centrally to avoid glancing blows and flying parts. Several moderate blows are usually safer than one very hard blow.
When are sledge hammers and club hammers used?
Sledge hammers of about 2 to 10 kg are swung with both hands for demolition, driving stakes or freeing large press-fitted parts. Club hammers of about 1 to 2 kg are used one-handed for heavy blows on chisels or punches. Keep a firm stance and clear space around the swing.
