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Home » Hammers » GP Range » 5” GP500 – DHD350

5” GP500 – DHD350

The GP500 is a high performance hammer which can drill under a head of water, typically suited to Waterwell and Geothermal applications due to its non-ported piston design.

It features a choke facility which helps to adjust air flow through the hammer.

At a Glance
Air pressure
Air flow
140mm - 165mm
5 1/2 - 6 1/2
100 - 435 psi
7 - 30 bar
180 - 1440 cfm
5097 - 40776 l/min
Hammer Overview
Hammer Model GP500 - DHD350
Part Number 600426
Shank DHD350
Thread Connection 3 1/2" API Reg Pin Up
Minimum Bit Diameter140mm
Hammer Flat Size66mm (64.750")
Weight 60 Kg (132.3 lbs)
Outside Diameter 126mm (4.96")
Length (shoulder to shoulder) 1074mm (42.3")
Minimum Weight On Bit400 Kg (900 lbs)
Maximum Weight On Bit900 Kg (1980 lbs)

Air Consumption

Parts List Maintenance Kits
Type GP500 - DHD350 Service Kit Repair Kit
Shank DHD350
Item Description Part No. SK83 RK138
1Thread Protector201701NoNo
2Top Adaptor604558NoNo
3Choke - Blank604480YesYes
Choke - 1/8"604481YesYes
Choke - 3/16"604482YesYes
4Non Return Valve604444NoNo
5N.R.V Spring760079YesYes
6Make up Shim - 4.5mm604446NoYes
Make up Shim - 5.0mm604447NoYes
Make up Shim - 5.5mm604448NoYes
7Compression Spring760109NoNo
8Air Distributor604442NoNo
11Square Snap Ring604937YesYes
14Snap Ring783054YesYes
15Bit Retaining Ring604689NoYes
Foot Valve601902NoYes

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