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Bonnethead (STANDALONE)
Bonnethead (STANDALONE)
Bonnethead (STANDALONE)

BONNETHEAD

Compact Performance Variant

Description

The Bonnethead is a compact version of the Hammerhead platform that preserves full plunger geometry and output in a shorter frame. Using a 3"+3" paired spacer and a 4" spacer, the overall length is reduced while maintaining rigidity and alignment. The design keeps the same power profile and reliability as the full-size platform in a lighter, more maneuverable format. Unique Turn Around and Slide components define its compact operation and layout.


Hardware Kit (Bonnethead / Scoophead / Scalloped)

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 2 x 1" + 1 x 1.5" + 1 x 3" + 2 x 5" + 3 x 8" + 2 x 12"
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 1 x 5"
Alum tube 0.509" ID (3ft) 9390N15 1 x 7" + 1 x 14"
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


Key Features

  • Compact frame with identical plunger geometry and power output

  • Spacer layout uses paired 3" + 3" and 4" segments for reduced length

  • Requires spacer matching to achieve a consistent 6" smooth segment

  • Includes Turn Around and Slide components unique to this variant

  • Suitable for builders wanting a shorter platform without performance loss

Spacer Note

Dual 3" spacers must be tolerance matched to form a true 6" smooth segment. Buying 6" spacers is an option but at higher cost. Expect some surplus if pairing your own.