Maltby MMB-17 Irons Specifications
Full factory loft, lie and length chart for the Maltby MMB-17 irons, from 2013.
- Years produced
- from 2013
- Category
- Blade / Muscleback
- Construction
- forged, modified muscle back with weight relief pocket (3-7) and tungsten toe weighting (3-5)
- Material
- forged 8620 carbon steel
- Set makeup
- 3–GW
Data confidence: medium. These figures are compiled from secondary sources rather than a manufacturer spec sheet. If you have an original catalogue page, send it over and we will update the chart.
Loft, lie & length chart
| Club | Loft (°) | Lie (°) | Length (in) | Offset (in) | Bounce |
|---|---|---|---|---|---|
| 3 | 21 | 60 | — | 0.145 | 3 |
| 4 | 24 | 60.5 | — | 0.138 | 3 |
| 5 | 27 | 61 | — | 0.131 | 3 |
| 6 | 31 | 61.5 | — | 0.124 | 3 |
| 7 | 35 | 62 | — | 0.117 | 3 |
| 8 | 39 | 62.5 | — | 0.11 | 3 |
| 9 | 43 | 63 | — | 0.105 | 3 |
| PW | 47 | 64 | — | 0.1 | 5 |
| GW | 51 | 64 | — | 0.1 | 5 |
Lofts and lies are the factory standard build. Individual clubs may differ if they have been bent, re-shafted or re-gripped during their life.
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Loft progression
About the Maltby MMB-17
The MMB-17 - Modified Muscle Back - is Maltby's forged blade-style iron softened just enough for a wider market: a weight relief pocket and inverted muscle design in the 3-through-7 irons, tungsten toe weighting in the 3-, 4- and 5-irons, and Maltby's MG multi-groove face, all forged from 8620 carbon steel for a soft feel. The GolfWorks' own Maltby MPF ratings chart dates it to 2013 with an MPF of 714, in the Super Game Improvement band by Maltby's own measurement despite reading as a traditional blade at address. Lofts run a 39-degree 8-iron and 47-degree pitching wedge with a matching 51-degree gap wedge, both wedges built to the same 291-gram head weight; a "DBM Black Forged" special finish was also sold under the PF701+ name. Sold as bare heads or built-to-order sets (commonly 4-PW or 4-P plus approach wedge) through The GolfWorks rather than off the rack.
Frequently asked questions
What is the loft of a Maltby MMB-17 7-iron?
Based on the confirmed 6-iron (31 degrees) and 8-iron (39 degrees) anchor points on the manufacturer-format chart, the 7-iron loft is 35 degrees, following the even 4-degree-per-club progression documented from the 6-iron through the gap wedge.
What does MMB stand for in the Maltby MMB-17?
Modified Muscle Back - a forged blade-style shape softened with a weight relief pocket, inverted muscle design in the 3-through-7 irons and tungsten toe weighting in the long irons, aimed at a wider range of players than a pure blade.
How forgiving is the Maltby MMB-17?
The GolfWorks' own MPF chart rates it 714 at the 6-iron - inside Maltby's Super Game Improvement playability band - despite its traditional blade-style look at address.
Production status
Introduced in 2013, the Maltby MMB-17 has no confirmed end date on file. LoftChart records a discontinuation year only where a source dates it, and none has been found for this set, so it may or may not still be in the Maltby catalogue — check with Maltby or a retailer before counting on a new set. Used sets appear on eBay, and should be measured against the chart above before buying, since irons are routinely bent from standard.
- GolfWorks Maltby MPF Ratings chart (golfworks.com/content/PDFs/Head_MPFs/MPFRatingsChart.pdf, retrieved July 2026) — 'MALTBY MMB-17 Forged #6 2013, MPF 714', fixing year_introduced 2013 and the Super Game Improvement playability band.
- GolfWorks-format retailer spec tables (audiogolfguide.com 'Maltby MMB-17 DBM Black Forged PF701+ Iron Set', golfironsi.com 'Maltby MMB-17 DBM Black Forged Iron Set 4-PW' and 'Maltby MMB-17 Forged Blade Iron Set 4-GW', read via search-indexed content) — the confirmed anchor points used to build the chart above: 3-iron 21 degrees/60 lie, 4-iron 24/60.5, 5-iron 27/61, 6-iron 31/61.5, 8-iron 39/62.5/276 g, 9-iron 43/63/284 g, PW 47/64/291 g/0.100 in offset/5 degrees bounce, GW 51/64/291 g/0.100 in/5 degrees bounce; irons 3-9 bounce of 3 degrees; offset for irons 3-8 spanning 0.145 down to 0.110 inches. Also: forged 8620 carbon steel, tungsten toe weighting in the 3-5 irons, weight relief pocket/inverted muscle in 3-7, and MG multi-groove face.
- The GolfWorks 'Maltby DBM, TE, MMB-17 Irons' comparison article (golfworks.com/maltby-dbm-te-mmb-17-irons/a/1711/) — positions the MMB-17 within Maltby's blade/players-cavity family.
- INTERPOLATION NOTE (confidence: medium): the 7-iron loft (35) and lie (62) are not independently sourced but are arithmetically forced by the confirmed, evenly-spaced 4-degree/0.5-degree steps between the sourced 6-iron (31/61.5) and 8-iron (39/62.5) anchors. The 9-iron offset (0.105) is a linear interpolation between the sourced 8-iron (0.110) and PW (0.100) values, not an independently confirmed figure. No manufacturer length column was found for this model - GolfWorks sells it as a bare head/custom-build product - so length is omitted rather than guessed.
Last updated 29 July 2026. Spot an error? info@loftchart.com