The Callaway Quantum Max OS is a 2026 super game-improvement iron engineered to deliver maximum forgiveness, powerful ball speed, and consistent carry — all wrapped in a bold, oversized shape that inspires confidence the moment you step up to address. Designed specifically for male golfers who want more solid contact across the entire face, the Quantum Max OS combines cutting-edge AI face technology, a modern undercut cavity, and a progressive sole design to help you hit the ball higher, farther, and straighter — shot after shot.
This custom single iron is built precisely to your specifications: right hand, 5-iron, Stiff flex, True Temper Elevate 85 steel shaft, and a Lamkin Crossline New Logo Midsize grip. The result is a fully personalised club fitted for your swing, ready to deliver the maximum performance benefit of every technology inside the Quantum Max OS head.
The fully exposed undercut, combined with extreme perimeter weighting, pushes mass to the very edges of the clubhead — creating exceptional stability and a low centre of gravity that promotes a penetrating, high-launch ball flight. The advanced two-piece construction allows the face to flex more efficiently across its entire surface, generating faster ball speeds and superior forgiveness even on off-centre impacts. This means that shots struck towards the heel or toe retain more energy and land closer to your intended target. For a super game-improvement iron, the 360° Undercut Cavity sets the Quantum Max OS apart by extending the high-performance zone well beyond the central sweet spot.
Callaway's artificial intelligence analyses thousands of real-world impact patterns and uses that data to sculpt each iron face into a unique, optimised shape that no human engineer could design manually. The result is a face that delivers more consistent launch angle, ball speed, and spin rate from wherever contact is made — producing tighter shot groupings and a larger effective sweet spot across the set. Unlike a conventionally shaped face that is optimised only at the geometric centre, the AI-Optimized Face performs at a consistently high level even when golfers miss the centre slightly — which is exactly how most golfers play, most of the time.
The sole geometry of the Quantum Max OS is not a single, uniform shape repeated across the entire set — it is progressively reengineered from the long irons through to the wedges to suit the demands of each individual club. In the longer irons, a leading-edge chamfer sits higher off the turf to promote a cleaner entry angle and reduce the tendency to dig on sweeping swings. Moving into the shorter irons, the sole profile transitions to a shape tailored for a steeper attack angle and a smooth exit through the turf. The outcome is more consistent ball-striking, better speed retention even on heavy contact, and more reliable performance across a wide variety of lie conditions and course surfaces.
Tiny urethane microspheres are injected into the cavity cavity directly behind the face of the Quantum Max OS. At the moment of impact, these microspheres compress and absorb the high-frequency vibrations that would otherwise generate a harsh, metallic sound and a stiff, uncomfortable sensation in the hands. The technology effectively bridges the gap between the hard-hitting performance of a speed-focused game-improvement iron and the soft, rewarding feel that golfers typically associate only with premium forged player's irons. The result is an impact sensation that is clean, satisfying, and forged-like — making every shot, whether solid or slightly off-centre, feel noticeably better in the hands.
The True Temper Elevate 85 is a premium steel shaft engineered for game-improvement iron players who want the consistency and control of steel combined with a weight profile that encourages high launch and maximum carry distance. At 85 grams (trimmed, Stiff), the Elevate 85 is lighter than a conventional steel shaft, which helps generate higher clubhead speed without sacrificing the stability and feedback that steel provides over graphite alternatives. The vanadium-enriched alloy construction adds durability and torsional resistance, ensuring the face returns to the correct position at impact even under aggressive swings. In Stiff flex, the Elevate 85 provides a responsive, controlled feel throughout the swing — ideal for players with faster swing speeds who still want the launching characteristics of a game-improvement iron.
The Lamkin Crossline is one of the most trusted grip designs in golf — renowned for its durability, all-weather traction, and consistent performance across a wide range of playing conditions. The New Logo Midsize version features an enlarged diameter that effectively reduces grip pressure in both hands, which in turn promotes a more relaxed forearm tension and a freer, more consistent swing tempo. For players who benefit from reduced tension in the hands and wrists — particularly those with larger hands or players prone to gripping too tightly — the Midsize profile is a meaningful performance upgrade over a standard grip. The Crossline pattern provides confident traction in both wet and dry conditions, making it a reliable choice for golfers who play year-round in varying weather.
| Specification | Detail |
|---|---|
| Brand | Callaway Golf |
| Model | Quantum Max OS (2026) |
| Category | Irons – Super Game Improvement |
| Intended For | Men |
| Hand | Right Hand (MRH) |
| Configuration | Single iron – 5-iron |
| Shaft Material | Steel |
| Shaft | True Temper Elevate 85 |
| Shaft Weight (Stiff) | 85 g (trimmed) |
| Flex | Stiff (S) |
| Grip | Lamkin Crossline New Logo Midsize |
| Grip Size | Midsize |
| Key Technologies | Modern 360° Undercut Cavity, Next Generation AI-Optimized Face, Progressive Tri-Sole Design, Urethane Microspheres |
| Awards | Golf Digest 2026 Hot List – Gold Medal |
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