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SL Shaft Lab Golf Est. 2012 · Boise, ID
Fitting Lab / Iron

Iron Fitting

A set of irons is only as good as its weakest link. Even well-made individual clubs can feel disconnected from one another if frequency, lie, and gapping were never checked as a set.

What We Capture

Set-Wide Consistency, Not Club-by-Club Guesswork

Every shaft in a proposed set is checked on the board for its frequency step relative to the club next to it — usually 4–5 CPM between clubs in a well-built set. Dynamic lie angle is verified with impact tape at true address posture, not a static bench reading alone.

Once frequency and lie are dialed in, we map carry distance gaps across the whole set so no two clubs are quietly fighting for the same yardage.

Iron Session Data Points
Frequency StepCPM / club
Dynamic Lie Angledegrees
Carry Gappingyds / club
Strike Consistency
The Variables

What We Check Across the Whole Set

Frequency Step

Each shaft is measured against its neighbors so the set steps up in stiffness evenly, rather than jumping unevenly between certain clubs.

Dynamic Lie Angle

Checked with impact tape at real address posture. A lie angle just a few degrees off can push shots consistently left or right regardless of swing path.

Shaft Length

Standard lengths assume an average posture and setup. A half-inch adjustment either direction can change strike location more than most golfers expect.

Set Makeup & Gapping

We map carry distance across every club to catch overlapping or oversized gaps before deciding where irons should stop and hybrids or wedges take over.

Cavity vs. Blade Design

Forgiveness and feel trade off differently across head designs. We match head style to your actual strike pattern rather than your handicap number alone.

Signs Your Set Is Out of Sync

What an Iron Fitting Usually Fixes

Every Club Feels a Little Different

If your 6-iron feels nothing like your 8-iron in the hands, an uneven frequency step is usually the culprit — not an inconsistent swing.

A Strike Pattern That Won't Move

Persistent toe or heel contact across several clubs often points to a lie angle or length issue rather than a repeated swing flaw.

Yardage Gaps That Don't Add Up

Two clubs that carry the same distance, or a gap that's twice the size of every other, usually means the set makeup needs a second look.

Divots Angled Left or Right

A consistent divot direction across multiple irons is one of the clearest on-course signs of a lie angle mismatch worth checking on the board.

Get Your Whole Set on the Same Page

Iron sessions run 60–90 minutes and include a full frequency and gapping report you keep, whether you order a new set or not.