Srixon I-403 AD vs Srixon I-506
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | I-403 AD loft | I-506 loft | I-403 AD lie | I-506 lie | I-403 AD length | I-506 length |
|---|---|---|---|---|---|---|
| 2 | — | 18 | — | 59 | — | 39.25 |
| 3 | 20 | 21 | 60 | 59.5 | — | 38.75 |
| 4 | 23 | 24 | 60.5 | 60 | — | 38.25 |
| 5 | 26 | 27 | 61 | 60.5 | — | 37.75 |
| 6 | 29 | 30 | 61.5 | 61 | — | 37.25 |
| 7 | 33 | 34 | 62 | 61.5 | — | 36.75 |
| 8 | 37 | 38 | 62.5 | 62 | — | 36.25 |
| 9 | 41 | 42 | 63 | 62.5 | — | 35.75 |
| PW | 45 | 46 | 63.5 | 63 | — | 35.25 |
| AW | 50 | — | 63.5 | — | — | — |
| SW | 55 | — | 63.5 | — | — | — |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- I-403 AD
- I-506
What the differences mean
At the 7-iron, the I-403 AD is 33° and the I-506 is 34°, a 1° gap. Each degree of loft is worth roughly 3 to 4 yards of carry at the same swing speed, so the I-403 AD should carry roughly 3 to 4 yards further with that club, on a slightly lower, shallower flight than the I-506. Across the 8 clubs both sets share, the I-506 averages 1° weaker, with the largest gap at the 3-iron (20° vs 21°). The pitching wedges are 45° and 46°; the stronger one leaves a 5° jump to a 50° gap wedge, which matters when planning wedge gapping. Beyond loft, the I-506 7-iron sits 0.5° flatter (62° vs 61.5°), which nudges start direction slightly right for a right-hander.
The sets are built differently: the I-403 AD runs 3-iron to SW (10 clubs), the I-506 2-iron to PW (9 clubs).
The I-403 AD is a game improvement iron and the I-506 a players iron, so they sit 2 steps apart on the forgiveness scale. The I-403 AD is the more forgiving design, with a wider sole, more offset and more perimeter weighting for roughly 10 to 25 handicaps. The I-506 trades some of that for a more compact head, thinner topline and more control over flight and shape, which suits roughly scratch to 10 handicaps.
The I-403 AD is listed as lost wax precision cast cavity back and the I-506 as forged cavity back. Forging, as in the I-506, is generally credited with a softer feel; casting, as in the I-403 AD, allows more complex cavity and weighting shapes, which is why it dominates forgiving irons. The I-403 AD adds tungsten weighting, which lowers the centre of gravity and raises stability on mis-hits, helping the long irons launch.
The I-506 came out 1 year after the I-403 AD, but it is a different line rather than a direct replacement, so the two were designed for different golfers as well as different seasons.
Which should you choose?
The I-506 is the weaker-lofted set — up to 1° weaker than the I-403 AD. 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: Srixon I-403 AD specs and Srixon I-506 specs.
Frequently asked questions
Is the Srixon I-403 AD stronger lofted than the I-506?
Yes. The Srixon I-403 AD 7-iron is 33° against 34° for the I-506, 1° stronger, which is worth roughly 3 to 4 yards of extra carry with the same swing.
What is the loft difference between the Srixon I-403 AD and I-506?
At the 7-iron the difference is 1° (33° vs 34°). The largest gap on a shared club is 1° at the 3-iron, and all 8 shared clubs differ.
Which is better for higher handicap golfers, the Srixon I-403 AD or the I-506?
The Srixon I-403 AD. As a game improvement iron it is the more forgiving design, suited to roughly 10 to 25 handicaps. The I-506 is a players iron, better suited to roughly scratch to 10 handicaps.
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