Proto-Concept C03 TC Irons Specifications
Full factory loft, lie and length chart for the Proto-Concept C03 TC irons, 2023–present.
- Years produced
- 2023–present
- Category
- Players Irons
- Construction
- forged tour cavity back (soft-iron forging with CNC-milled undercut on
- Material
- S20C/S25C soft carbon steel
- 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) |
|---|---|---|---|
| 4 | 22 | 60.5 | 38.5 |
| 5 | 25 | 61 | 38 |
| 6 | 28 | 61.5 | 37.5 |
| 7 | 32 | 62 | 37 |
| 8 | 36 | 62.5 | 36.5 |
| 9 | 40 | 63 | 36 |
| PW | 45 | 63.5 | 35.5 |
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 C03 TC
The C03 TC ("Tour Cavity") is a players iron in PROTOCONCEPT's C-series, sitting between the muscle-back C01 and the pocket-cavity C05 - a soft-iron forging with a CNC-milled undercut back cavity on the #4 through #7 irons only, so the long irons get extra forgiveness while the short irons keep a higher, more compact centre of gravity for a controlled, flatter flight with more spin. It was announced 19 May 2023, not 2022 as sometimes listed - PROTOCONCEPT's own first-look coverage and MyGolfSpy's review both date the launch to spring 2023. Heads are sold component-style, 4-PW, and 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, consistent with the rest of the C-series in this dataset.
Related models
Frequently asked questions
What is the loft of a Proto-Concept C03 TC 7-iron?
The Proto-Concept C03 TC 7-iron has a loft of 32 degrees, a lie of 62 degrees, and a recommended steel length of 37 inches.
When was the Proto-Concept C03 TC released?
It was announced on 19 May 2023 - not 2022, which some listings imply by association with PROTOCONCEPT's earlier Golf Digest Hot List recognition.
What does 'TC' mean on the Proto-Concept C03 TC?
Tour Cavity. A CNC-milled undercut is machined into the back of the #4 through #7 heads only, giving the long irons extra forgiveness while the shorter irons keep a higher, more controlled centre of gravity.
Where it sits in the lineup
Introduced in 2023, the Proto-Concept C03 TC is a current players set in the Proto-Concept range as of September 2026, with no replacement announced. New sets are built to the standard lofts, lies and lengths in the chart above, though a fitting can move any of them — so confirm the numbers on the order sheet. Used sets appear on eBay, and should be measured against this chart before buying.
- fairwayjockey.com Proto Concept C03TC Custom Irons listing - full spec table: lofts 22/25/28/32/36/40/45, lies 60.5-63.5, recommended steel assembly lengths 38.5 to 35.5 inches, face progression 3.6-4.4 mm, soft-iron forging with CNC undercutting on #4-#7
- shop.torquegolf.com 'Proto Concept Irons C03' listing - independent corroboration of the 25/28/32/36/40/45 loft/lie/FP chart for #5-PW, bounce 3-8 degrees, and S25C soft-iron construction with CNC undercutting on #5-#7
- protoconceptgolf.com blog 'FIRST LOOK: PROTO CONCEPT CO3 TC IRON REVIEW', published 2023-05-19 - fixes the announcement date used for year_introduced
- mygolfspy.com First Look and full review of the Proto Concept C03TC (July 2023) - corroborates the spring/2023 release window and the improved-sole, CNC-undercut cavity design versus the C01
- Status check, 29 September 2026: confirmed as a current model with no replacement announced. Live and available on Proto-Concept's store (protoconceptgolf.com).
Last updated 29 September 2026. Spot an error? info@loftchart.com