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Manual Compaction Hammers are sliding drop 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, and allows a secure, comfortable grip during use and prevents rolling during storage. Both hammer models have a 2in (51mm) flat, circular face. Inquire for old-style U.S. Army Corps of Engineers Compaction Hammers.
HM-550 5.5lb Manual Compaction Hammer has 5.5lb (2.5kg) hammer mass with 12in (305mm) drop.
HM-551 10lb Modified Manual Compaction Hammer has 10lb (4.5kg) hammer mass and 18in (457mm) drop.
HM-550: 21 x 2.2in (533 x 55mm) L x Dia.
HM-551: 31 x 2.2in (787 x 55mm) L x Dia.
HM-550: 9.0lbs (4.08kg)
HM-551: 15.0lbs (6.80kg)
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