Steel Hex Head Pin Shoulder Pin with Unthreaded Shank for Locating

The Steel Hex Head Pin Shoulder Pin With Unthreaded Shank for Locating combines the driving torque of a hexagon head with the precision of a ground, unthreaded shank. The shank diameter is held to close tolerances, functioning as a locating shoulder or rotating pivot point. Threads, if present, are limited to the tip or omitted entirely, ensuring the full shank engages the mating component without play.

This design solves two common problems in fixture building: alignment drift from worn dowel pins, and the difficulty of extracting tight-fitting pins. You can drive it with a standard wrench, then remove it just as easily. The steel construction offers good tensile strength for most industrial locating applications, from assembly line changeover kits to mold base alignment.

Product Parameter (Specification)

Product Feature

• Full-length unthreaded shank Steel Hex Head Pin Shoulder Pin With Unthreaded Shank for Locating

• – No thread crests to damage mating bores or collect debris in dirty environments

• External hex drive – Use standard combination wrenches, sockets, or even a speed handle for fast changeovers without special tools

• Precision-ground locating diameter – Holds position within thousandths for repeatable fixture registration and assembly jigs

• Easy removal – Unlike press-fit dowel pins, you can back this pin out with a wrench in seconds, saving maintenance time

• Steel construction – Offers strength for locating stops in automated lines, welding fixtures, or heavy equipment alignment

• Wear-resistant option – Available with black oxide or zinc plating to resist rust in humid shop environments

Application

• Fixture and jig locating –Full-length unthreaded shank Steel Hex Head Pin Shoulder Pin With Unthreaded Shank for Locating

• Full-length unthreaded shank Positions parts consistently for drilling, welding, or assembly operations

• Quick-change tooling plates – Acts as a removable alignment pin for pallet systems or modular fixturing

• Equipment alignment stops – Provides a positive mechanical stop for moving slides or indexers

• Mold base alignment – Guides mold halves during assembly and teardown without galling guide pins

• Automation changeover kits – Allows operators to swap locating positions rapidly when switching product sizes

• Rotary indexing stations – The unthreaded shank serves as a short pivot shaft for light rotating components

• Inspection gauge fixtures – Creates repeatable part nests for CMM or go/no-go checks

Production Details

1. Hex head design for direct wrench engagement

The Steel Hex Head Pin Shoulder Pin With Unthreaded Shank for Locating external hexagon head allows installation and removal using standard combination wrenches, socket drivers, or even a speed handle. No need for special hex keys or press-fit extraction tools. This makes changeover faster compared to dowel pins or round head shoulder screws.

2. Fully unthreaded, precision-ground shank

The bearing surface is completely free of threads from the underside of the head down to the tip (or down to a short reduced-diameter section). The shank is centerless ground to a consistent tolerance, typically +0.000 / -0.002 inches or H7 metric fit. This smooth surface acts as both a locating dowel and a low-friction pivot.

3. Steel material with multiple finish options

Made from bar stock grades such as 12L14, 1045 medium carbon, or alloy steel like 4140. Surface finishes include plain (oil-coated), black oxide for mild rust resistance, or zinc plating for better corrosion protection in humid shop conditions. Hardened versions reach 40–50 HRC on the shank for wear-intensive applications like sliding stops.

4. Concentricity between hex head and shank

The hex head is machined on the same axis as the locating shank, typically within 0.001 inch TIR (total indicator reading). Poor concentricity would cause wobble or uneven seating. Our process uses live tooling on CNC lathes, so the hex is cut without re-chucking.

5. Optional threaded tip for retention

Some variants include a short male thread at the very end of the pin, sized smaller than the shank diameter. This allows a nut to be added on the opposite side of the workpiece, pulling the shoulder pin tight against its seat. For pure locating applications, no threads are present.

6. Chamfered lead-in for easier assembly

The tip of the unthreaded shank has a slight chamfer or radius. This helps guide the pin into the mating hole without scraping the bore wall. Particularly useful when aligning multiple pins across a large fixture plate.

7. Available in inch and metric dimensions

Inch sizes: shank diameters from 1/4″ up to 1″, with hex head widths across flats matching standard bolt dimensions. Metric sizes: 6mm to 25mm shank diameters, with hex head dimensions per ISO or DIN standards. Lengths from short locating buttons up to longer shoulder pins for stacked plates.