Bonnethead — Compact Performance Variant
The Bonnethead is a streamlined, compact version of the Hammerhead platform that keeps full power in a tighter, more agile frame. By using 3+3" and 4" spacers, Bonnethead reduces overall length while maintaining identical plunger geometry and output. It’s built for those who want the same performance and reliability in a lighter, more maneuverable form.
Hardware Kit (Bonnethead/Scoophead):
| Part | McMaster # | Qty required |
|---|---|---|
| 4-40 3/8" FH (steel) | 90273A108 | 24 |
| 4-40 1" FH (steel) | 90273A115 | 12 |
| 10-32 3/4" FH (steel) | 90273A831 | 6 |
| 10-32 1.25" BH (steel) | 91440A516 | 6 |
| 10-32 1.75" BH | 90279A837 | 6 |
| 10-32 1/8" thick nut | 90480A195 | 12 |
| 10-32 Flange nut | 90389A113 | 3 |
| 10-32 threaded rod (3ft) | 98838A011 | 30 |
| Catch Washer | 7421K12 | 1 |
| 1.5" OD washer | 92141A035 | 1 |
| 4" Spacer (steel) | 93265A042 | 1 |
| 3" Spacer (steel) | 93265A034 | 4 |
| 1" Spacer | 93330A476 | 3 |
| Small Spring (3/4") (36" *5) | 9662K16 | 6 |
| K26 (11") (5.5" piece) | 9637K26 | 1 |
| K25 (11") (5.5" piece) | 9637K25 | 1 |
| 1.375" ID Plunger Tube (3ft) | 53945K21 | 5 |
| Alum tube 0.509" ID (3ft) | 9390N15 | 21 |
| Press Insert for plastic | 92395A112 | 6 |
| 1.375" OD O-RING | 9452K87 | 6 |
| 0.5" OD O-RING FAT | 9452K18 | 6 |
| 0.5" OD O-RING | 9452K21 | 6 |
Why Choose Bonnethead
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Compact layout with no compromise on power or performance
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Uses 3"+3" and 4" spacers to shorten the frame while keeping rigidity and balance. Caution that 3" spacers must be matched up properly to create a 6" smooth spacer. 6" spacers are also sold on McMaster but they are quite expensive so this is an affordable workaround. If you would like to do it on your own be prepared to have a surplus of spacers because some won't work because of precision differences.
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Retains full Hammerhead output thanks to identical plunger and chamber geometry
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Includes unique components like the Turn Around and Slide pieces that define its distinct operation and profile
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Perfect for builders who want a short, responsive blaster that still feels like a full-size build