Skip to main content

The best screwdrivers have shafts made from good-quality steel, and handles of tough moulded plastic.

Buy a tool with a reputable brand name. Cheap tools with brittle plastic handles can be dangerous, as they may break under pressure.

Use a screwdriver with a blade that fits exactly into the screw slot - if it is flat-bladed it should be no wider than the slot. If the blade is ill-fitting, the tool is more likely to slip or open out the screw head. Keep flat blades ground square, with the edge evenly tapered.

A very tight screw can sometimes be shocked loose by tapping the end of the screwdriver with a hammer. A few drops of penetrating oil and a firm tap may free a rusted screw.

Engineer's screwdriver

Strong-shafted engineer's screwdrivers are designed for heavy mechanical work. The longer the shaft and the thicker the handle, the greater the turning effort that can be applied.

The blades may be flat to fit into a straight (or plain) slot screw, or cross-headed (such as Phillips or Pozidrive) to fit into a cross-slot screw. Use the correct type of cross-head for the screw, or its slot may be damaged.

Shafts generally range in length from about 100 to 300mm plain, or 80-200mm cross-head. Shafts may be squared or have a hexagonal shoulder at the base so that a spanner can be fitted to help with stubborn screws.

Chubby screwdriver

Short-handled, short-shafted chubby or stubby screwdrivers are designed for use in confined spaces. Some have handles that can be fitted with a T-bar to give extra leverage.

Shafts are generally about 35-38mm long, and both flat-head or cross-head blades are available.

Angle screwdriver

Angle, right-angle or offset screwdrivers are useful for reaching screws in awkward positions. They are generally 5 to 6in. long. Normally, angle screwdrivers have a blade at each end; both may be the same type - flat or cross-head - or there may be one end of each type

A screwdriver is a tool, manual or powered, for turning (driving or removing) screws. A typical simple screwdriver has a handle and a shaft, and a tip that the user inserts into the screw head to turn it. The shaft is usually made of tough steel to resist bending or twisting. The tip may be hardened to resist wear, treated with a dark tip coating for improved visual contrast between tip and screw—or ridged or treated for additional 'grip'. Handle are typically wood, metal, or plastic and usually hexagonal, square, or oval in cross-section to improve grip and prevent the tool from rolling when set down. Some manual screwdrivers have interchangeable tips that fit into a socket on the end of the shaft and are held in mechanically or magnetically. These often have a hollow handle that contains various types and sizes of tips, and a reversible ratchet action that allows multiple full turns without repositioning the tip or the user's hand.

A screwdriver is classified by its tip, which is shaped to fit the driving surfaces—slots, grooves, recesses, etc.—on the corresponding screw head. Proper use requires that the screwdriver's tip engage the head of a screw of the same size and type designation as the screwdriver tip. Screwdriver tips are available in a wide variety of types and sizes (List of screw drives). The two most common are the simple 'blade'-type for slotted screws, and Phillips.

A wide variety of power screwdrivers range from a simple 'stick'-type with batteries, a motor, and a tip holder all inline, to powerful "pistol" type VSR (variable-speed reversible) Cordless drills that also function as screwdrivers. This is particularly useful as drilling a pilot hole before driving a screw is a common operation. Special combination drill-driver bits and adapters let an operator rapidly alternate between the two. Variations include impact drivers, which provide two types of 'hammering' force for improved performance in certain situations, and "right-angle" drivers for use in tight spaces. Many options and enhancements, such as built-in bubble levels, high/low gear selection, magnetic screw holders, adjustable-torque clutches, keyless chucks, 'gyroscopic' control, etc., are available.

Read more on

Guides that use

Fitting a new speedometer cable

Speedometer failure is likely to be caused by a fault in the cable that runs from the gearbox to ...

Fitting a new voltage regulator

When you have tested the charging system of a car fitted with an alternator, and the checks in Ho...

Draining and refilling a fully sealed cooling system

The sealed system Coolant in a sealed system does not evaporate to the atmosphere, and should ne...

Fitting new headlamps

Sealed-beam headlamps are simple to change, but the way of gaining access to them varies from car...

Adjusting an emission-control carburettor

Anti-pollution laws in many countries now limit the volume of poisonous carbon monoxide gas (CO) ...

Cleaning fuel-pump filters

A blocked fuel-pump filter will cause the engine to cut out intermittently, particularly at high ...

Checking the dwell angle

The -breaker setting can be accurately measured with a dwell meter. Dwell angle Points fu...

Stripping the starter motor

Remove the starter motor from the car (See Checking and replacing starter-motor brushes). The bod...

Checking steering-box mountings

Places where vital components are mounted on the bodywork or chassis should be inspected at least...

Adjusting and replacing a power-steering drive belt

The belt that drives a power-steering hydraulic-fluid pump is usually at the front of the engine,...

Checking a clutch cable

The clutch cable has a steel-wire inner core sliding inside an outer sheath. It should last at le...

Adjusting wheel bearings

Hub-bearing layout Wheel bearings need periodic checking - and adjusting if necessary - usually ...

Checking, removing and refitting road wheels

When you take the wheels off to inspect the tyre walls, clean the wheels thoroughly and look clo...

Replacing transmission oil seals

Replacing a gearbox-extension housing seal The extension housing seal can usually be replaced wi...

Checking engine dampers

Checking a telescopic damper If for any reason you suspect that a telescopic damper is not dampi...

Checking steering joints for wear

Steering-column joints. There are often one or two universal joints in the steering-column shaft...

Replacing starter or dynamo bearings

Tap out the bush with a hammer. Starter-motor bearings are usually bushes made of graphite-bronz...

Checking and replacing the starter motor

Testing for short circuits Use a test lamp fitted with crocodile clips to make these tests. You ...

Adjusting the static timing

Setting top dead centre Align the timing notch on the crankshaft pulley with the marks on the en...

Fitting a condenser

Fitting a Lucas distributor Replacing the condenser, which is mounted internally, is simple; but...

Fitting new high-tension leads

Numbering the plug leads Before you dismantle, wrap masking tape around each plug lead and write...

Inspecting the ignition system

A typical ignition system. The most usual type of coil, with the HT connection at one end in the...

Servicing a mechanical fuel pump

Many pump tops have one central screw. Remove the screws holding the top of the pump to the body...

Removing a carburettor for cleaning

Lifting off the carburettor Unscrew the nuts holding the carburettor to the inlet manifold studs...

Checking a mechanical fuel pump

Two-way valve On some SU pumps a single two-way valve on the diaphragm controls the flow. The pu...

Lubricating hinges, pedals and locks

Use a screwdriver if necessary to remove or to fit a pedal pad. Oiling foot pedals Most brake an...

Checking and renewing brake cables

Twin cables are usually fixed to the handbrake adjusting screws. Handbrake cable layouts vary fr...

Removing and refitting a dynamo pulley

Using vice pads If you have to hold the armature in a vice to free the nut, pad the...

Checking heater and ventilator output

Disconnecting the heater return hose Disconnect at the engine end and direct water away from the...

How to flush an engine radiator

Make the hosepipe a tight fit by jamming it in with rags. Flush the water through until it runs...

icon-link- paul-ryan.info icon-logo-star- paul-ryan.info icon-search- paul-ryan.info icon-star- paul-ryan.info
купить диплом в России

cl24.com.ua

Этот популярный интернет-сайт , он описывает в статьях про www.engi.kiev.ua.