Allen screw

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Allen screw

[′al·ən ‚skrü]
(design engineering)
A screw or bolt which has an axial hexagonal socket in its head.
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References in periodicals archive ?
If you are working with a sight housing that was previously held on with pins, tap the holes to 8-32 and use four Allen screws (3/16" length will fit flush when screwed in, longer 1/4" screws protrude a bit.
If you are going to do this I recommend using the same threads on all the Allen screws to make it a little more user friendly for the customer.
We, however, lay drained and demoralised at its feet, with one remaining Allen screw boring a hole in our nerves.
Also, there was no Allen screw in the bottom of the plunger hole, but there is on some guns.
The rear sight, additionally secured with an Allen screw, retains the firing pin block and its spring.
Batteries will last for approximately 1-1/2 hours left in the on position The V2 is adjustable for windage using an Allen screw on the right side and elevation screws are located beside the on/off pushbutton.
There are two tiny allen screws to adjust the laser diode for windage and elevation and a pair of wrenches--plus some swabs for cleaning the front of the laser--are included.
All you have to do is loosen -- and then tighten -- two Allen screws to change barrels.
Two small allen screws adjust windage and elevation, and a solar cell provides most of the power, although there is a battery if there isn't enough light.
The grip frame is also secured to the main frame with Allen screws.