Automotion produce a wide range of fasteners designed for application where it is important that fasteners are not separated from equipment (e.g. cover panels etc). This is now important to ensure that equipment complies with Machinery Directive 200642/EC - requiring that fasteners remain attached to fixed guards or equipment when guards are removed.
Our captive panel screws are manufactured mainly from stainless steel (A2, AISI 303 grade), but they can also be produced in stainless steel (A4, AISI 316), aluminium, brass or zinc plated steel.
Many finishes can be applied - black oxide finish, anodizing etc.
The main options are as follows:
|Black chrome is hard, non-reflective coating which is resistant to abrasion, heat and erosion. The black chrome surface is a dull, dark grey and may be waxed or oiled to darken surface.|
|Black Oxide Coating|
|Black oxide is a uniform black coating for ferrous metals. Generally it is considered a decorative coating and provides only very limited corrosion protections under mild corrosion conditions.|
|Cadmium||Cadmium is a bright, silvery white plating. Supplementary treatments for type II can be golden, iridescent, amber, black or olive drab.|
|Passivation is a process designed to remove foreign metals from the surface of stainless and corrosion resistant steels.|
|Phosphate Coating Ligth|
|Phosphate coating is a light coating for use as a base paint.|
|Yellow to orange colour depending on a proprietary process used. Will range from matt to bright finish depending on base metal. Good corrosion resistance and high tarnish resistance.|
|Nickel||Nickel is a corrosion protective plating for steel, zinc and zinc alloys as well as copper and copper alloys.|
|The primary use of chromate finishes on zinc is to retard or prevent formation of white corrosion products on zinc surfaces.|
|Hexagonal recess||Ideal for precision assembly. Most recommended where less surface area is available.|
|Provides good control in driveing. Always use a driver bit of the proper size which is in good condition.|
|Positive-engaging, fast-locating method which transmits drive torque with less required downward pressure. Good fastening appearance.|
|Slotted||Accepts standard blade screwdriver. Requires less downward pressure to drive parts than those with recessed openings. Use a proper fitting blade to minimise slippage.|
|Security||These screws are impossible to remove without the special matching screw driver.|
P0151 - Button Head - Hex Security and Torx® Options
P0154 - Socket Head - Cap Screw Security and Torx® options
P0158 - Hexagon Head Bolt
P0159 - Captive Panel Screw
P0160 - Thin Head Thumb Screws
P0161 - Thumb Screws
One option to retain screws to panels are our retaining washers. Used in place of retainer flanges, retaining washers are a simple but effective when used with our captive screws. The captive screws have a normal thread then a reduced diameter for the rest of the screw length.
The retaining washer has a small length of thread on the internal diameter and once screwed on to the captive screw is effectively captive.
These are simple but effective when used with our captive screws. The captive screws have a normal thread then a reduced diameter for the rest of the screw length.
The washer has a small length of thread on the internal diameter and once screwed on to the captive screw is effectively captive.
Screw the thin retaining washer onto the captive screw and the screw is therefore retained to the panel.
The flange is then joined to the panel using either a simple ball bearing (or for higher volume parts a hand punch) to form the bottom of the flange into the countersink. This retains the flange to the sheet.
Retaining flange secured onto panel using ball bearing or punch
The captive screw or bolt is then threaded onto the retainer flange and once the thread length is through the initial shallow threaded portion of the retainer flange - is captive
With any captive screw installation it is important to ensure that there is enough space for the threaded portion to become disengaged from the female thread of the structure.
To work eff ectively the captive screw when installed needs to have a space or counterbore between the thread and cover at least equal to the length of the thread.
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