Proto-Concept C07 Irons Specifications
Full factory loft, lie and length chart for the Proto-Concept C07 irons, 2020–2024.
- Years produced
- 2020–2024
- Category
- Game Improvement Irons
- Construction
- pocket cavity (forged SAE8655 face on S20C body, 3-level face-thickness variation)
- Material
- SAE8655 chromium-molybdenum steel face, S20C carbon steel body
- Set makeup
- 4–PW
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) | Bounce |
|---|---|---|---|---|
| 4 | 22 | 61 | 38.5 | 3 |
| 5 | 25 | 61.5 | 38 | 4 |
| 6 | 28 | 62 | 37.5 | 5 |
| 7 | 31 | 62.5 | 37 | 6 |
| 8 | 35 | 63 | 36.5 | 6.5 |
| 9 | 39 | 63.5 | 36 | 7.5 |
| PW | 44 | 64 | 35.75 | 8.5 |
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 Proto-Concept C07
The C07 is the most forgiving model in PROTOCONCEPT's original C-series, part of the first iron range from the brand the Endo forging house and the Golf Partner retail group established in 2019, on the market from 2020 alongside the C01 and C05. A forged SAE8655 chromium-molybdenum face with three distinct thickness zones - about 1.8 mm at the top blade thinning to 2.7 mm lower on the face - is joined to an S20C carbon steel body over a pocket cavity, pushing weight low and deep for an easy, straight ball flight. Heads are sold component-style, 4-PW, assembled to order in Japan or the USA. Lengths below are the manufacturer's recommended steel assembly lengths; PROTOCONCEPT publishes face progression rather than offset, so that key is omitted. The loft ladder carried unchanged into PROTOCONCEPT's current "PC" (Premium Custom) C07PC line, which added a 49-degree gap wedge.
Related models
Frequently asked questions
What is the loft of a Proto-Concept C07 7-iron?
The Proto-Concept C07 7-iron has a loft of 31 degrees, a lie of 62.5 degrees, and a recommended steel length of 37 inches.
Is the Proto-Concept C07 forged?
The face is forged SAE8655 chromium-molybdenum steel with three distinct thickness zones, joined to an S20C forged carbon-steel body over a pocket cavity.
Is the Proto-Concept C07 the most forgiving model in the C-series?
Yes - among the original C01, C03, C05 and C07 lineup, the C07's deep pocket cavity and low, deep centre of gravity make it the most game-improvement-oriented of the four.
Finding a used set
The Proto-Concept C07 ran from 2020 to 2024 and is no longer in production, so the used market is the only source. Search the used listings on eBay, and check the loft and lie against the chart above before buying — sets this age have often been bent from standard.
- customclubs.eu 'Proto Concept - C07 Forged - 6 irons (custom)' listing - spec table: lofts 22/25/28/31/35/39/44, lies 61-64, recommended steel assembly lengths 38.5 to 35.75 inches, SAE8655 chromium-molybdenum face with three-level thickness deviation (1.8-2.7 mm) on an S20C body
- shop.torquegolf.com 'Proto Concept Irons C07' listing - independent corroboration of the identical loft/lie ladder plus bounce 3-8.5 degrees and face progression 3.0-4.5 mm across #4-PW
- mygolfspy.jp 'Know Your Japanese Brands: Proto Concept' (September 2021) - dates the C05 and C07 to the market from 2020 as part of PROTOCONCEPT's original C-series, alongside the brand's 2019 founding by the Endo forging house and Golf Partner
- protoconceptgolf.com 'C07PC FORGED IRON' current product page - confirms the loft ladder (22/25/28/31/35/39/44) carried over unchanged from the original C07 into the current C07PC line, which adds a 49-degree gap wedge not present in the original set
- Status check, 29 September 2026: year_discontinued is 2024. The C07 is on the maker's discontinued models page (proto-c.jp) and the C07PC Forged was published on 27 September 2024.
Last updated 29 September 2026. Spot an error? info@loftchart.com