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Hammer Raw Hammer - Black / Grey specs
The Hammer Raw Hammer - Black / Grey is a solid reactive ball with the Raw Hammer core. Here are its published specs, how they compare with the other current balls in our table, and what the numbers mean on the lane.
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| Coverstock | Juiced Solid |
|---|---|
| Cover type | Solid reactive |
| Core (weight block) | Raw Hammer |
| Core type | Not stated |
| RG | 2.537 |
| Differential | 0.038 |
| Factory finish | 500, 1500, 3000 Siaair Micro Pad |
| Maker's category | Lower Mid Performance |
| Color | Black / Grey |
| Weights | 16-10 Pounds |
| Release date (maker) | May 14, 2026 |
Numbers as Hammer publishes them, checked 21 October 2026. Published for a 15-pound ball. Drilling changes how a ball behaves, so a pro shop's layout matters as much as these numbers.
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What the numbers mean
RG 2.537. That is lower than 18% of the 134 current reactive and urethane balls in our table, so it sits on the high side. Storm says "a high RG ball delays its revving, offering more length and angular motion down the lane."
Differential 0.038. Higher than 30% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Solid reactive cover. Storm says solid covers are "particularly effective on fresh oil patterns," and bowling.com calls them best on heavier oil.
USBC allows an RG from 2.447 to 2.813 inches and a differential of at most 0.060 inches (Equipment Specifications Manual, March 2026). Our ball spec table lists every current ball we track, and who makes bowling balls covers which company owns Hammer.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Radical Revenge Solid: RG 2.544, differential 0.036
- Storm Monsoon: RG 2.530, differential 0.042
- Motiv Supra Sport: RG 2.550, differential 0.043
- Roto Grip Hustle (VTC Solid): RG 2.530, differential 0.030
Sources: Hammer product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Equipment Specifications Manual.