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A2 Stainless Steel
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A2 stainless is also called 303 stainless or 304 stainless steel. It can also be called 18/8 because it approximately contains 18% Chromium and 8% Nickel. It is an austenitic non magnetic steel. The Chromium gives the metal corrosion protection properties, although it can still oxidise (tarnish). It is commonly used for fasteners in food, dairy and agriculture businesses because it is safe to use with food. A2 comes in three different property classes 50 (500 N/mm2), 70 (700 N/mm2) and 80 (800 N/mm2) tensile strengths.
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ACME Thread
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An American screw thread having a section that is a mean between the V threads and square threads. It has a 29 degree included angle, and is mainly used for feeds and adjusting screws on machine tools.
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Acorn Nut
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A nut shaped with an acorn head that 'caps' the top. An acorn nut, also referred to as crown hex nut, blind nut, cap nut, domed cap nut, or dome nut. When used with a bolt, setscrew or threaded end, the domed end encloses the external thread of the threaded fastener, either to protect the thread itself or to protect nearby objects from contact with the thread. In addition, the dome gives a more finished appearance.
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Aerotight Nut
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A special vibration resistant self locking nut (also known as stiffnuts), which self lock due to slots in two places (located on the top of the nut), these slots are then bent slightly inwards and downwards after the nut has been tapped. When the nut is screwed onto a bolt thread, the two slotted parts are forced back to their original position locking and securing the nut in place.
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Allthread
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Round bar threaded for its full length, is available in all thread types and grades.
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Anco nuts
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Mainly used in the petro-chemical industry, it is an all metal self lock nut with a stainless steel ratchet pin. The nut prevents removal of coatings and damage to the bolt threads.
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Angle controlled tightening
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"Tightening procedure in which a fastener is first tightened so that the clamped surfaces are pulled together, it is tightened further by giving the nut an additional measured rotation such as a 1/2 turn or more. Frequently bolts are tightened beyond their yield point by this method in order to ensure that a precise preload is achieved. Using this method, bolts of short length can be elongated too much and the bolt material must be sufficiently ductile to cater for the plastic deformation involved. Because of the bolt being tightened beyond yield, its re-use is limited."
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ANSI
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The American National Standards Institute is a private non-profit making organisation that oversees the development fastener product standards in the United States.
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ASME
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The dimensional standards for fasteners, developed by the American Society of Mechanical Engineers
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Barrel nut
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An internally threaded scew with a slotted head, used in the furniture industry.
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Basic thread profile
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This is the theoretical profile of external and internal threads with no manufacturing tolerance applied
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Bearing Nuts
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Bearing nuts are also known as slotted hook nuts and are used to lock bearing onto shafts and shafts onto housings
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Bearing stress
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The surface pressure acting on a joint face directly as a result of the force applied by a fastener
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