Lighter Long Irons
The 3- and 4-iron shafts use the lightest weight within each flex, making the longer clubs easier to accelerate than the progressively heavier shafts found later in the set.
AMT Black uses Ascending Mass Technology to create lighter long-iron shafts and progressively heavier scoring-club shafts, supporting speed in the long irons with added control and feel as the set moves toward the wedges.
AMT Black changes shaft weight throughout the set so the long irons, middle irons and scoring clubs can each provide an appropriate blend of speed, stability and feel.
The 3- and 4-iron shafts use the lightest weight within each flex, making the longer clubs easier to accelerate than the progressively heavier shafts found later in the set.
Beginning with the 5-iron, weight increases in approximately three-gram steps to create a clear transition as the clubs become shorter.
The short-iron and wedge shafts provide additional weight for golfers who prefer a more substantial feel when controlling tempo, trajectory and distance.
Every AMT Black shaft is assigned to a specific iron position. The 3- and 4-iron shafts share the lightest nominal weight, followed by progressive increases through the middle and short irons, with the heaviest shaft reserved for the wedge.
Select the raw shaft length corresponding with the intended club.
Weight begins at 94 grams in the 3- and 4-iron shafts and progresses to 115 grams in the wedge. This provides a moderate-weight steel option with a clear increase in scoring-club shaft weight.
Weight begins at 95 grams in the 3- and 4-iron shafts and progresses to 116 grams in the wedge, offering a firmer profile with the same ascending-weight concept.
| Intended Club | Flex | Weight | Raw Length | Tip Diameter | Butt Diameter | Torque |
|---|---|---|---|---|---|---|
| 3-Iron | Regular | 94 g | 40" | .355" | .600" | Low |
| 4-Iron | Regular | 94 g | 39.5" | .355" | .600" | Low |
| 5-Iron | Regular | 97 g | 39" | .355" | .600" | Low |
| 6-Iron | Regular | 100 g | 38.5" | .355" | .600" | Low |
| 7-Iron | Regular | 103 g | 38" | .355" | .600" | Low |
| 8-Iron | Regular | 106 g | 37.5" | .355" | .600" | Low |
| 9-Iron | Regular | 109 g | 37" | .355" | .600" | Low |
| Wedge | Regular | 115 g | 36.5" | .355" | .600" | Low |
| Intended Club | Flex | Weight | Raw Length | Tip Diameter | Butt Diameter | Torque |
|---|---|---|---|---|---|---|
| 3-Iron | Stiff | 95 g | 40" | .355" | .600" | Low |
| 4-Iron | Stiff | 95 g | 39.5" | .355" | .600" | Low |
| 5-Iron | Stiff | 98 g | 39" | .355" | .600" | Low |
| 6-Iron | Stiff | 101 g | 38.5" | .355" | .600" | Low |
| 7-Iron | Stiff | 104 g | 38" | .355" | .600" | Low |
| 8-Iron | Stiff | 107 g | 37.5" | .355" | .600" | Low |
| 9-Iron | Stiff | 110 g | 37" | .355" | .600" | Low |
| Wedge | Stiff | 116 g | 36.5" | .355" | .600" | Low |
The lighter long-iron shafts may make it easier to generate speed while retaining steel-shaft construction and a low-torque response.
AMT Black provides a structured weight increase from the longer irons into the scoring clubs instead of using one constant weight throughout the set.
Heavier short-iron and wedge shafts provide a more substantial feel for players who use shaft weight to help control tempo and partial shots.
Each shaft must be ordered for its intended iron position. Grater Golf can help confirm flex, head compatibility, playing length, swing-weight considerations and available assembly options.
Grater Golf can help you choose the proper flex, match each shaft with its intended iron and plan the specifications for a balanced custom build.
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