Mizuno JPX-850 vs Mizuno JPX-900 Hot Metal
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | JPX-850 loft | JPX-900 Hot Metal loft | JPX-850 lie | JPX-900 Hot Metal lie | JPX-850 length | JPX-900 Hot Metal length |
|---|---|---|---|---|---|---|
| 4 | 22 | 21 | 60 | 60 | 38.25 | 38.25 |
| 5 | 25 | 24 | 60.5 | 60.5 | 37.75 | 37.75 |
| 6 | 28 | 27 | 61 | 61 | 37.25 | 37.25 |
| 7 | 32 | 31 | 61.5 | 61.5 | 36.75 | 36.75 |
| 8 | 36 | 35 | 62 | 62 | 36.25 | 36.25 |
| 9 | 40 | 40 | 62.5 | 62.5 | 35.75 | 35.75 |
| PW | 45 | 45 | 63 | 63 | 35.5 | 35.5 |
| GW | 50 | 50 | 63 | 63 | 35.25 | 35.25 |
| SW | — | 55 | — | 63 | — | 35.25 |
| LW | — | 60 | — | 63 | — | 35.25 |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- JPX-850
- JPX-900 Hot Metal
What the differences mean
At the 7-iron, the JPX-850 is 32° and the JPX-900 Hot Metal is 31°, a 1° gap. Each degree of loft is worth roughly 3 to 4 yards of carry at the same swing speed, so the JPX-900 Hot Metal should carry roughly 3 to 4 yards further with that club, on a slightly lower, shallower flight than the JPX-850. Across the 8 clubs both sets share, the JPX-900 Hot Metal averages 0.6° stronger, with the largest gap at the 4-iron (22° vs 21°).
The sets are built differently: the JPX-850 runs 4-iron to GW (8 clubs), the JPX-900 Hot Metal 4-iron to LW (10 clubs).
Both are game improvement irons, built for roughly 10 to 25 handicaps. Perimeter-weighted cavity backs with wider soles, more offset and stronger lofts, aimed at mid handicaps. Because they target the same golfer, the decision comes down to the specific loft, feel and shaping differences rather than who the sets are made for.
Both heads are listed as investment cast. 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.
The JPX-900 Hot Metal arrived 2 years after the JPX-850, a typical one-generation refresh. Changes over that span are usually incremental: refined face thickness, revised weighting, updated looks and small loft tweaks rather than a new concept. Here the 7-iron loft moved from 32° to 31°.
Which should you choose?
The JPX-900 Hot Metal is the stronger-lofted set — up to 1° stronger than the JPX-850 on matching clubs. Expect longer carry per numbered iron but a flatter descent angle; gapping at the wedge end is where that shows up.
Both charts are reproduced in full on their own pages: Mizuno JPX-850 specs and Mizuno JPX-900 Hot Metal specs.
Frequently asked questions
Is the Mizuno JPX-850 stronger lofted than the JPX-900 Hot Metal?
No. The JPX-900 Hot Metal is the stronger-lofted set: its 7-iron is 31° against 32° for the Mizuno JPX-850, 1° stronger and worth roughly 3 to 4 yards of extra carry.
What is the loft difference between the Mizuno JPX-850 and JPX-900 Hot Metal?
At the 7-iron the difference is 1° (32° vs 31°). The largest gap on a shared club is 1° at the 4-iron, and 5 of the 8 shared clubs differ.
Are the Mizuno JPX-850 and JPX-900 Hot Metal aimed at the same golfer?
Yes. Both are game improvement irons, built for roughly 10 to 25 handicaps. Choose on feel, looks and gapping, ideally after hitting both.
Do the Mizuno JPX-850 and JPX-900 Hot Metal have the same lie and length?
At the 7-iron, yes: both are 61.5° lie and 36.75 inches long.
Shop both models
Compare prices for new and used sets on eBay:
We may earn a commission from purchases made through links on this page at no extra cost to you.