RS PRO Slot Pan Steel Machine Screw DIN 85, 560-748

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The slot connection will take core of moving the screw along the slot If you leave the rotation about the screw axis unconstrained you will be able to rotate

Round Slot Head Screws Machine screws have finer threads than wood screws They are designed to be used in conjunction with a nut or Cutting screw head slots in a lathe

studiobet78 slot Captive Screw, M3 X , Press-in, PhillipsSlot Combination, Knurled Bright Knob  You can position them say 8 apart, slot between them, then loosen one, slide it closer, tighten, loosen the other and then space them back