Sub 70 639 CB vs Sub 70 639 MB
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | 639 CB loft | 639 MB loft | 639 CB lie | 639 MB lie | 639 CB length | 639 MB length |
|---|---|---|---|---|---|---|
| 3 | 20 | 20 | 59.5 | 59.5 | 39 | 39 |
| 4 | 22 | 22 | 60 | 60 | 38.5 | 38.5 |
| 5 | 25 | 25 | 60.5 | 60.5 | 38 | 38 |
| 6 | 28 | 28 | 61 | 61 | 37.5 | 37.5 |
| 7 | 32 | 32 | 61.5 | 61.5 | 37 | 37 |
| 8 | 36 | 36 | 62 | 62 | 36.5 | 36.5 |
| 9 | 40 | 40 | 62.5 | 62.5 | 36 | 36 |
| PW | 44 | 45 | 63 | 63 | 35.75 | 35.75 |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- 639 CB
- 639 MB
What the differences mean
At the 7-iron, the 639 CB is 32° and the 639 MB is 32°, identical at the club most golfers compare on, although other clubs in the sets differ. Across the 8 clubs both sets share, the differences roughly cancel out, with the largest gap at the PW (44° vs 45°). The pitching wedges are 44° and 45°; the stronger one leaves a 6° jump to a 50° gap wedge, which matters when planning wedge gapping.
The 639 CB is a players iron and the 639 MB a blade iron, so they sit one step apart on the forgiveness scale. The 639 CB is the more forgiving design, with a wider sole, more offset and more perimeter weighting for roughly scratch to 10 handicaps. The 639 MB trades some of that for a more compact head, thinner topline and more control over flight and shape, which suits low single-digit handicaps who strike the ball consistently.
Both heads are listed as forged from a billet with a CNC-milled back. 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 2019, so this is a choice between two models from the same lineup rather than an upgrade: Sub 70 designed them to sit side by side for different players.
Which should you choose?
The 639 MB is the weaker-lofted set — up to 1° weaker than the 639 CB. 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: Sub 70 639 CB specs and Sub 70 639 MB specs.
Frequently asked questions
Is the Sub 70 639 CB stronger lofted than the 639 MB?
Not at the 7-iron, where both are 32°. Other clubs in the sets differ, so compare the full table above.
What is the loft difference between the Sub 70 639 CB and 639 MB?
At the 7-iron the difference is 0° (32° vs 32°). The largest gap on a shared club is 1° at the PW, and 1 of the 8 shared clubs differ.
Which is better for higher handicap golfers, the Sub 70 639 CB or the 639 MB?
The Sub 70 639 CB. As a players iron it is the more forgiving design, suited to roughly scratch to 10 handicaps. The 639 MB is a blade iron, better suited to low single-digit handicaps who strike the ball consistently.
Do the Sub 70 639 CB and 639 MB have the same lie and length?
At the 7-iron, yes: both are 61.5° lie and 37 inches long.
Shop Sub 70 639 CB
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