What is an adjustable pry bar?
|A modern design, the adjustable pry bar features a claw that can be adjusted up to 180°, and locked at the preferred angle. Some models incorporate an extendable shaft, allowing the user to increase or decrease the length of the bar by 315mm (12.5in).|
|This type of bar has a round shaft, for ease of use and economy of production, and features a handle rather than a second claw or tip; some handles are ridged for extra grip.|
|The claw is curved to reduce the risk of damaging the surfaces of objects during levering and prying. Due to the lack of a nail slot or nail puller, however, it cannot be used to remove nails.|
|The adjustable claw makes this bar very versatile for a range of light levering and prying applications; because you’ll have the option of adjusting to a straight or bent claw, there is no need for a second claw.|
|Claws adjusted to acute angles can be used to lift and pry objects in confined spaces, and to increase the angle of leverage where required.|
|Claws adjusted to obtuse angles can be used for gentler prying applications where less force is required, or to lift and move objects only a short distance.|
|An extendable shaft allows the user to increase and decrease the length of the bar. As a longer shaft offers greater leverage, extending the shaft will make levering and prying actions much easier (see: A note on leverage and length). Retracting the shaft will offer the user greater control over the bar; ideal for precision use.|
|Adjustable claw bars with non-extendable shafts are available in lengths of 250-380mm (10-15in), while extendable models are available in lengths of 600mm (23.5in), plus 315mm (12.5in) available extension.|
|Bars with non-extendable shafts can weigh from 370-580g (13oz-1.3lb). The extendable model weighs 2.05kg (4lb 8oz).|
|For comparison, this means that the lightest adjustable claw bar weighs the same as a standard computer mouse …|
|… while the largest weighs roughly the same as four pints of milk and a can of lemonade …|
|… and the extendable model weighs the same as a packaged whole chicken.|
What are adjustable pry bars made of?
|Adjustable pry bars are forged from chrome vanadium steel, a type of steel alloy which incorporates carbon, manganese, phosphorous, sulphur, silicon, chromium, and vanadium. This may also be referred to as ‘chromium-vanadium steel’.|
|The presence of chromium and vanadium in the alloy makes the steel more hardenable – this means that it can be hardened (made tougher) to a greater degree than some other steels.|
|Chromium also has the benefit of helping to resist abrasion, oxidation, and corrosion, while the addition of carbon (found in the majority of steel alloys) improves elasticity.|
|Improved elasticity counters the brittleness that can come from hardening steel, and means that the tool is more likely to bend than snap under excessive force – this is much safer for the user.|
What are adjustable pry bars coated with?
|The adjustable pry bars shown here are coated with a phosphate coating for corrosion resistance.
This is a type of crystalline conversion coating which can be formed on ferrous metals like alloy steels, and is applied prior to any other coating or painting.
|Crystalline conversion coating uses a solution which reacts naturally with the surface of a metal object. In this case, a mixture of phosphoric acid and phosphate salts is applied to the surface of a tool via spraying or immersion in a bath, forming a crystalline layer of phosphates which cannot be dissolved or washed away.|
|A phosphate coating alone is porous and will not prevent rust or corrosion unless sealed with an oil or other sealant after application. If a tool is marketed as corrosion resistant and has a phosphate coating, another sealant must have been applied to the surface of the tool.|
What is an adjustable pry bar used for?
|Adjustable pry bars can be used for a range of prying, levering, and lifting applications such as:|
|Door and board lifting|
|Prying tightly fastened objects loose|
|Lifting paving slabs|