Callaway Quantum Max Fast vs Callaway Quantum Max OS
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | Quantum Max Fast loft | Quantum Max OS loft | Quantum Max Fast lie | Quantum Max OS lie | Quantum Max Fast length | Quantum Max OS length |
|---|---|---|---|---|---|---|
| 4 | — | 19 | — | 60.375 | — | 39.125 |
| 5 | 22 | 22 | 60.75 | 61 | 38.75 | 38.5 |
| 6 | 25 | 25 | 61.375 | 61.625 | 38.125 | 37.875 |
| 7 | 28 | 29 | 62 | 62.25 | 37.5 | 37.25 |
| 8 | 32 | 33 | 62.5 | 62.875 | 36.875 | 36.625 |
| 9 | 37 | 37 | 63 | 63.5 | 36.25 | 36 |
| PW | 42 | 42 | 63.25 | 63.75 | 36 | 35.75 |
| AW | 46 | 47 | 63.5 | 64 | 35.75 | 35.5 |
| GW | 50 | 51 | 63.75 | 64 | 35.5 | 35.5 |
| SW | 56 | 55 | 64 | 64 | 35.25 | 35.25 |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- Quantum Max Fast
- Quantum Max OS
What the differences mean
At the 7-iron, the Quantum Max Fast is 28° and the Quantum Max OS is 29°, a 1° gap. Each degree of loft is worth roughly 3 to 4 yards of carry at the same swing speed, so the Quantum Max Fast should carry roughly 3 to 4 yards further with that club, on a slightly lower, shallower flight than the Quantum Max OS. Across the 9 clubs both sets share, the Quantum Max OS averages 0.3° weaker, with the largest gap at the 7-iron (28° vs 29°). Beyond loft, the Quantum Max Fast 7-iron sits 0.2° flatter (62° vs 62.25°), which nudges start direction slightly right for a right-hander; the Quantum Max Fast 7-iron is 0.25 inches longer (37.5" vs 37.25").
The sets are built differently: the Quantum Max Fast runs 5-iron to SW (9 clubs), the Quantum Max OS 4-iron to SW (10 clubs).
The Quantum Max Fast is a game improvement iron and the Quantum Max OS a super game improvement iron, so they sit one step apart on the forgiveness scale. The Quantum Max OS is the more forgiving design, with a wider sole, more offset and more perimeter weighting for high handicaps, beginners and slower swing speeds. The Quantum Max Fast trades some of that for a more compact head, thinner topline and more control over flight and shape, which suits roughly 10 to 25 handicaps.
Both heads are listed as two-piece Modern 360° Undercut cavity body with a Progressive Tri-Sole and urethane microspheres. With the build method this similar, differences in feel come down to head size, sole width, topline and offset rather than how the heads are made.
Both sets were introduced in 2026, so this is a choice between two models from the same lineup rather than an upgrade: Callaway designed them to sit side by side for different players.
Which should you choose?
The Quantum Max OS is the weaker-lofted set — up to 1° weaker than the Quantum Max Fast. That trades raw distance for a steeper landing angle and more predictable stopping power into greens.
Both charts are reproduced in full on their own pages: Callaway Quantum Max Fast specs and Callaway Quantum Max OS specs.
Frequently asked questions
Is the Callaway Quantum Max Fast stronger lofted than the Quantum Max OS?
Yes. The Callaway Quantum Max Fast 7-iron is 28° against 29° for the Quantum Max OS, 1° stronger, which is worth roughly 3 to 4 yards of extra carry with the same swing.
What is the loft difference between the Callaway Quantum Max Fast and Quantum Max OS?
At the 7-iron the difference is 1° (28° vs 29°). The largest gap on a shared club is 1° at the 7-iron, and 5 of the 9 shared clubs differ.
Which is better for higher handicap golfers, the Callaway Quantum Max Fast or the Quantum Max OS?
The Quantum Max OS. As a super game improvement iron it is the more forgiving design, suited to high handicaps, beginners and slower swing speeds. The Callaway Quantum Max Fast is a game improvement iron, better suited to roughly 10 to 25 handicaps.
Do the Callaway Quantum Max Fast and Quantum Max OS have the same lie and length?
Not exactly. At the 7-iron the Callaway Quantum Max Fast is 62° lie and 37.5 inches, the Quantum Max OS 62.25° and 37.25 inches. Both can be bent or built to your own fit.
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