Best 1/2 Inch Edge Finder (2026): 5 Picks for Mill Setup

Specs compared

Specifications are manufacturer rated as listed, collected 25 October 2026.

What the listings tell you, and what they leave out

Accuracy is stated for two of the five listings only: Brown and Sharpe states a tolerance of plus or minus 0.0001 inch, and HHIP states an accuracy of .0002 inch. The other three listings state no accuracy figure, so their precision rests on descriptions such as precision ground, finely ground and lapped, or hardened and ground on all working surfaces. Shank and tip sizes are stated for every listing, with 1/2 inch shanks on all five and 3/8 inch shanks on three of them.

What the listings leave out matters as much. No listing states a warranty term or a safety certification, and only Brown and Sharpe states a weight, at 2.39 ounces, while Generic states 7 ounces. The RAHISH listing states its facts in its title and spec table, with no separate bullet detail to add. Treat any figure a listing does not state as not stated, rather than borrowing it from another listing.

Buying guide: choosing the best 1/2 inch edge finder

Shank size

Every listing here states a 1/2 inch shank, while ASSORTS, Generic and RAHISH also state a 3/8 inch shank in their sets. A single finder with a 1/2 inch shank suits a mill setup that uses that shank size, while a set with both shank sizes covers more setups. Check the shank size against the holder the mill uses before ordering.

Tip size and contact type

Tip sizes vary: Brown and Sharpe states a 0.500 inch tip, HHIP states .20/.50 inch tips, ASSORTS states a cone double end of 1/2 inch by 3/16 inch and a single end of 3/8 inch by 3/16 inch, and Generic states .200 & .375 inch tips with a wiggler and centering point. Brown and Sharpe is the only audible finder here, giving an audible click and visible deflection on contact, while the others state mechanical contact without sound. For work where a click confirms contact, the audible finder stands apart.

Stated accuracy

Brown and Sharpe states the smallest tolerance figure here, a tolerance of plus or minus 0.0001 inch of nominal size, followed by HHIP at .0002 inch. The other listings state no accuracy figure, so compare them on build descriptions instead: hardened steel, precision ground and lapped, or hardened and ground on all working surfaces. Where a job needs a stated figure, pick from the two listings that give one.

Sets against single finders

ASSORTS states 5 pieces, Generic states 4 pieces, and RAHISH states 8 pieces, while Brown and Sharpe and HHIP are single finders. A set covers more edge and center tasks in one purchase, with cases stated for ASSORTS and Generic, while a single finder gives a stated accuracy figure and a simpler choice. The CNC tooling category holds more tooling guides for the same mill setup.

Project Match

• Workpiece edge location in CNC milling: Brown and Sharpe, with a 1/2 inch shank, a 0.500 inch tip and an audible click on contact.
• Jig boring and machine work starting points: HHIP, which states it locates the starting point for machine work and jig boring, and Generic, which states jig borers among its machines.
• Edges, shoulders, grooves, center points and scribe lines: ASSORTS, which lists all of those uses, and Generic, which states shoulders, grooves, center points and a scribed line.
• Center and edge finding in one set: RAHISH, an 8 piece center and edge finder set with 1/2 inch and 3/8 inch shanks.
• Material stated: alloy steel for RAHISH, hardened steel for Brown and Sharpe and ASSORTS, metals for HHIP, and not stated for Generic.

How the scores add up

The HQ Score weighs performance, build, value, safety and warranty. For edge finders, safety means a stated safety-relevant feature or certification; none of these listings state one, so all five score 0 for safety. None of the five listings state a warranty term either, so warranty also scores 0 across the comparison, and the ranking rests on performance, build and value from the stated shanks, tips, accuracy and set contents. How we pick explains the weights.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

FAQ: lasers and CNC

What is an edge finder?

An edge finder is a milling accessory that locates a workpiece edge, shoulder, groove, center point or scribed line, so the mill can be set to the workpiece. The listings here describe edge finders for milling, drilling, jig boring and CNC work.

Which shank sizes do these listings state?

All five listings state a 1/2 inch shank. ASSORTS, Generic and RAHISH also state a 3/8 inch shank in their sets.

What accuracy do the listings state?

Brown and Sharpe states a tolerance of plus or minus 0.0001 inch, and HHIP states an accuracy of .0002 inch. The other three listings state no accuracy figure.

What feedback does an audible edge finder give?

Brown and Sharpe states an audible click and visible deflection upon edge contact. The other listings state mechanical contact without sound.

Does any listing state a warranty?

No. None of the five listings states a warranty term, so warranty scores 0 for every pick here.

Related: CNC tooling, dial indicator vs edge finder, tool setter vs edge finder, edge finder vs probe.