Is a chromed wrench with a mirror finish stronger than a satin-finish wrench? Is it necessary to have both chrome and impact sockets? Is there any benefit to a dead-blow hammer?
Those are good questions that deserve answers:
Hand wrenches come with three basic finishes:
- Chrome
- Satin
- Industrial
They all start out with an identical chunk of steel alloyed with chrome vanadium. The only difference is the type of finish they get.
Satin
A Brand X satin-finish wrench is as strong as that brand’s chrome-finish wrench.
Industrial
Wrenches with black industrial finishes are designed for use in factories. They are more economical, but corrode more easily if used outdoors.
Chrome
- “Impact sockets,” the dull black sockets recommended for use with impact wrenches, are made from chrome-molybdenum steel. Chrome-moly sockets have more give than chrome vanadium sockets, allowing them to stand up to the hammering of impact wrenches.
- Chrome sockets are built with thinner walls to access tighter spaces when used with hand tools. Those thin walls, combined with the slightly brittle nature of chrome vanadium, can crack if used with an impact wrench.
Jaw design can influence the strength of open-end wrenches.
“Every so often some wrench manufacturer comes out with a V-shape in the back of the jaws on their open-end wrenches,” says Tom Clark, Wright Tools engineer. “Anywhere there’s a sharp corner in steel, it can create a stress riser, and those V-shaped wrenches can have problems with cracking at the V.”
Vintage coarse-toothed socket wrenches withstood more torque than their fine-toothed counterparts because a single, thick pawl was stronger than a single, thinner pawl. But manufacturers figured out how to have multiple, smaller teeth on the pawl mechanism to give strength nearly equal to coarse-toothed pawls. Today’s quality ratchet wrenches “purr” rather than “rattle” when twisted.
Dead-blow hammers have a cavity inside their head partially filled with lead shot. When the hammer is swung, the shot shift to the rear of the cavity. On impact, inertia drives the shot toward the striking surface, adding force to the blow a split second after the initial impact. The secondary impact also reduces rebound.
As a test, allow a dead-blow and a solid-head hammer to free-fall so their heads simultaneously hit an anvil. The dead-blow hammer consistently rebounds less.
Personal experience indicates the force; i.e., pain, from dead-blow or solid-head hammers smacking a finger is pretty much the same.
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