McMaster-Carr

Without a head to get in the way, these screws fit in tight spaces where standard shoulder screws cannot. Either thread them in a countersunk hole for a flush mount, or install them with the shoulder sticking out to use them as pins or dowels for aligning and locating components.

Dowel Pin Assortments

Dowel pins are commonly used as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. They're slightly oversized for a tight fit.

Hole-Alignment Pins

Line up holes by driving these pins through existing rivet, pin, and bolt holes in multiple pieces of metal.

Clamping and Workholding

Locating Pins

Install these pins in a plate or table and mate with holes in a workpiece for precise alignment.

Spring-Loaded Guides

Use spring force to push workpieces into position against stops and rails. The internal spring allows easy insertion and removal of parts in a fixture and accommodates slight variations in size from part to part.

Locating and Support Buttons

Made to tight tolerances, use these rests to support and position workpieces and fixtures from the bottom or side.

High-Precision Index Plungers

To align two parts with more precision than standard spring plungers, these index plungers have a mating bushing that improves alignment and repeatability.

Inspection and Measuring Fixturing

Use these components in coordinate measuring machine (CMM) applications to raise a workpiece and reliably position it on a fixture plate with ¼"-20 holes.

Ball-Lock Quick-Change
Fixture Clamps

Build these components into fixture plates, machine subplates, and tombstones for quick changes. The system clamps and locates at the same time for accurate positioning with repeatability of ±0.0005".

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Fastening and Joining

Pins

Spring Plungers

Headless Alloy SteelPrecision Shoulder Screws