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Old version by GripperBot on 2026-09-17 15:00:27 compared to new version by GripperBot on 2026-09-18 16:13:39

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1# Captains of Crush Grippers 1# Captains of Crush Grippers
2 2
3Captains of Crush (CoC) is IronMind's fixed-resistance torsion-spring gripper line, designed and manufactured in the United States. The modern grippers use knurled aluminum handles and the company's GR8 springs.[^1] 3Captains of Crush (CoC) is IronMind's fixed-resistance torsion-spring gripper line, designed and manufactured in the United States. The modern grippers use knurled aluminum handles and the company's GR8 springs.[^1]
4 4
5![Captains of Crush Grippers](https://www.ironmind-store.com/images/1250-14_f.jpg) 5![Captains of Crush Grippers](https://www.ironmind-store.com/images/1250-14_f.jpg)
6 6
7*Product photograph: IronMind.* 7*Product photograph: IronMind.*
8 8
9## Construction and development 9## Construction and development
10 10
11IronMind dates the introduction of its knurled aircraft-grade aluminum handles to **1995** and its GR8 spring generation to **2005**.[^1] 11IronMind dates the introduction of its knurled aircraft-grade aluminum handles to **1995** and its GR8 spring generation to **2005**.[^1]
12 12
13### Handle stamps 13### Handle stamps
14 14
15Older examples are commonly described by their handle-end markings: 15Older examples are commonly described by their handle-end markings:
16 16
17- **Single stamp:** the model number appears on the bottom of one handle. 17- **Single stamp:** the model number appears on the bottom of one handle.
18- **Double stamp:** the model number appears on the bottom of both handles. 18- **Double stamp:** the model number appears on the bottom of both handles.
19 19
20These terms describe the markings. They are not an RGC rating or a guarantee that two examples have identical resistance. Collector measurement records explicitly identify single-stamped examples alongside later grippers.[^2] 20These terms describe the markings. They are not an RGC rating or a guarantee that two examples have identical resistance. Collector measurement records explicitly identify single-stamped examples alongside later grippers.[^2]
21 21
22## Model range 22## Model range
23 23
24IronMind lists eleven strengths. The following are its approximate advertised pound ratings, not RGC values:[^1] 24IronMind lists eleven strengths. The following are its approximate advertised pound ratings, not RGC values:[^1]
25 25
26| Model | IronMind rating | 26| Model | IronMind rating |
27| --- | --- | 27| --- | --- |
28| Guide | 60 lb | 28| Guide | 60 lb |
29| Sport | 80 lb | 29| Sport | 80 lb |
30| Trainer | 100 lb | 30| Trainer | 100 lb |
31| No. 0.5 | 120 lb | 31| No. 0.5 | 120 lb |
32| No. 1 | 140 lb | 32| No. 1 | 140 lb |
33| No. 1.5 | 167.5 lb | 33| No. 1.5 | 167.5 lb |
34| No. 2 | 195 lb | 34| No. 2 | 195 lb |
35| No. 2.5 | 237.5 lb | 35| No. 2.5 | 237.5 lb |
36| No. 3 | 280 lb | 36| No. 3 | 280 lb |
37| No. 3.5 | 322.5 lb | 37| No. 3.5 | 322.5 lb |
38| No. 4 | 365 lb | 38| No. 4 | 365 lb |
39 39
40## Ratings and comparisons 40## Ratings and comparisons
41 41
42Cannon PowerWorks publishes independent measurements of individual grippers and aggregated model statistics. Its method loads a gripper until the handles touch, and its comparison table includes only new, unfiled grippers. Manufacturer labels and these measured ratings should not be substituted for one another.[^3] 42Cannon PowerWorks publishes independent measurements of individual grippers and aggregated model statistics. Its method loads a gripper until the handles touch, and its comparison table includes only new, unfiled grippers. Manufacturer labels and these measured ratings should not be substituted for one another.[^3]
43 43
44For example, Jason Steeves' 2012 collection records include several CoC No. 3 grippers with differing measured ratings, including a single-stamped specimen. Such records are useful for documenting particular grippers, rather than assigning one exact resistance to an entire production era.[^2] 44For example, Jason Steeves' 2012 collection records include several CoC No. 3 grippers with differing measured ratings, including a single-stamped specimen. Such records are useful for documenting particular grippers, rather than assigning one exact resistance to an entire production era.[^2]
45 45
46See [RGC rating](/Gripper_Rating_Info/Rating_Types/RGC) for context and the [Cannon PowerWorks ratings table](https://cannonpowerworks.com/pages/grip-strength-ratings-data) for the maintained comparison data. 46See [RGC rating](/Gripper_Rating_Info/Rating_Types/RGC) for context and the [Cannon PowerWorks ratings table](https://cannonpowerworks.com/pages/grip-strength-ratings-data) for the maintained comparison data.
47 47
48## Commemorative examples
49
50CoC grippers have also served as personalized competition mementos. David Horne's collection inventory records a No. 4 inscribed **British Grip Championship 2002 Open 1st**. This documents an individual commemorative example; the inventory does not identify it as a separately marketed IronMind model or give an edition size.[^5]
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48## Related IronMind grippers and reading 52## Related IronMind grippers and reading
49 53
50IronMind also makes the reverse-wound [Left-Turn](/Gripper_Brands/Captains_of_Crush_Left-Turn), short-handled [IMTUG](/Gripper_Brands/IM_Tug) and smooth-handled [Zenith](/Gripper_Brands/Zenith). Their separate pages cover the design differences. 54IronMind also makes the reverse-wound [Left-Turn](/Gripper_Brands/Captains_of_Crush_Left-Turn), short-handled [IMTUG](/Gripper_Brands/IM_Tug) and smooth-handled [Zenith](/Gripper_Brands/Zenith). Their separate pages cover the design differences.
51 55
52The manufacturer's [CoC instruction booklet](https://ironmind.com/.galleries/pdfs/CoCBooklet-SinglePages-PDFs-070516.pdf) and [training, care and certification FAQ](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers-faq/) provide further product-specific guidance.[^4] 56The manufacturer's [CoC instruction booklet](https://ironmind.com/.galleries/pdfs/CoCBooklet-SinglePages-PDFs-070516.pdf) and [training, care and certification FAQ](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers-faq/) provide further product-specific guidance.[^4]
53 57
54[^1]: IronMind, [Captains of Crush Grippers](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers/), construction, development dates and model range. 58[^1]: IronMind, [Captains of Crush Grippers](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers/), construction, development dates and model range.
55[^2]: Jason Steeves, [My RGC Rated Grippers](https://shoggoth09.blogspot.com/p/my-rgc-ranked-grippers.html), May 2012 collection measurements. 59[^2]: Jason Steeves, [My RGC Rated Grippers](https://shoggoth09.blogspot.com/p/my-rgc-ranked-grippers.html), May 2012 collection measurements.
56[^3]: Cannon PowerWorks, [Ratings Data](https://cannonpowerworks.com/pages/grip-strength-ratings-data), measurement method and sample criteria. 60[^3]: Cannon PowerWorks, [Ratings Data](https://cannonpowerworks.com/pages/grip-strength-ratings-data), measurement method and sample criteria.
57[^4]: IronMind, [Captains of Crush Grippers FAQ](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers-faq/).61[^4]: IronMind, [Captains of Crush Grippers FAQ](https://ironmind.com/product-info/ironmind-grippers/captains-of-crush-grippers-faq/).
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63[^5]: David Horne, [Gripper Collection](https://www.davidhorne-gripmaster.com/davidhornesgrippercollection.html), IronMind entries, inscription on a commemorative No. 4.

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