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Soil Compaction Hammers are sliding drop proctor hammers used for compaction of moisture-density relationship (Proctor) soil samples. Only Gilson Hammers feature 100% 303 stainless steel construction for maximum corrosion resistance and long service life. Hammer masses are enclosed in guide sleeves with vent holes that ensure unrestricted free-fall.
The heavy knurled hexagonal cap is welded to the tube for a secure, comfortable grip during use and prevents rolling during storage. All hammer models have a 2in (51mm) flat, circular face.
The U.S. Army Corps of Engineers COE compaction hammers feature a recoil mechanism in the foot assembly to reduce wear on internal components, have a removable/replaceable tamping face, and allow for slight drop adjustability.
HM-550 Soil Compaction Hammer (Standard) has 5.5lb (2.5kg) hammer mass with 12in (305mm) drop.
HM-551 Soil Compaction Hammer (Modified) has 10lb (4.5kg) hammer mass and 18in (457mm) drop.
HM-555 Soil Compaction Hammer (C.O.E) has 5.5lb (2.5kg) hammer mass with 12in (305mm) drop.
HM-556 Soil Compaction Hammer (C.O.E) has 10lb (4.5kg) hammer mass and 18in (457mm) drop.
HM-550: 21 x 2.2in (533 x 55mm) LxDia.
HM-551: 31 x 2.2in (787 x 55mm) LxDia.
HM-550: 9.0lb (4.08kg)
HM-551: 15.0lb (6.80kg)
HM-555: 15.0lb (6.80kg)
HM-556: 19.0lb (8.62kg)
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