Friction Reducers for CPT Sounding Tubes

A friction reducer (OD = 36 mm) combines two purposes. It connects the piezocone, electrical CPT cone or mechanical cone to the first CPT sounding tube and it reduces the lateral friction on the string of CPT sounding tubes during cone penetration testing.

The friction reducers are available either with cams or with a ring. The ring type friction reducer is primarily used in clays and clayey soils. The cam type friction reducer is mostly used in sands. For more background reading, please consult "Cone Penetration Testing in Geotechnical Practice" by T. Lunne a.o.

Friction reducers come in various sizes and lay-outs in order to meet the industry's needs.

• Friction reducer (L = 1000 mm) with 4 cams -  Top thread: female STD / Bottom thread: male STD
• Friction reducer (L = 1000 mm) with 4 cams - Top thread: female QLK / Bottom thread: male QLK
• Friction reducer (L = 1000 mm) with 4 cams - Top thread: female AR / Bottom thread: male AR
• Friction reducer (L = 1000 mm) with 4 cams - Top thread: female 2R / Bottom thread: male 2R

• Friction reducer (L = 1000 mm) with ring - Top thread: female STD / Bottom thread: male STD
• Friction reducer (L = 1000 mm) with ring - Top thread: female QLK / Bottom thread: male QLK
• Friction reducer (L = 1000 mm) with ring - Top thread: female AR / Bottom thread: male AR
• Friction reducer (L = 1000 mm) with ring - Top thread: female 2R / Bottom thread: male 2R

• Friction reducer (L = 300 mm) with 4 cams - Top thread: female STD / Bottom thread: male STD
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female QLK / Bottom thread: male STD
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female AR / Bottom thread: male STD
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female 2R / Bottom thread: male STD
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female QLK / Bottom thread: male QLK
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female AR / Bottom thread: male AR

• Friction reducer (L = 300 mm) with 4 cams - Top thread: female STD / Bottom thread: female M28 (GMF-GD)
• Friction reducer (L = 300 mm) with 4 cams - Top thread: female QLK / Bottom thread: female M28 (GMF-GD)

• Friction reducer / inclinometer housing with 4 cams - Top thread: female QLK / Bott. thread: female M28 (ELC10)
• Friction reducer / inclinometer housing with 4 cams - Top thread: female AR / Bott. thread: female M28 (ELC10)
• Friction reducer / inclinometer housing with 4 cams - Top thread: female 2R / Bott. thread: female M28 (ELC10)

• Friction reducer (L = 300 mm) with ring - Top thread: female STD / Bottom thread: male STD
• Friction reducer (L = 300 mm) with ring - Top thread: female QLK / Bottom thread: male STD
• Friction reducer (L = 300 mm) with ring - Top thread: female AR / Bottom thread: male STD
• Friction reducer (L = 300 mm) with ring - Top thread: female 2R / Bottom thread: male STD

• Friction reducer (L = 300 mm) with ring - Top thread: female QLK / Bottom thread: male QLK
• Friction reducer (L = 300 mm) with ring - Top thread: female AR / Bottom thread: male AR

• Friction reducer (L = 300 mm) with ring - Top thread: female STD / Bottom thread: female M28 (GMF-GD)
• Friction reducer (L = 300 mm) with ring - Top thread: female QLK / Bottom thread: female M28 (GMF-GD)

• Friction reducer / inclinometer housing with ring - Top thread: female QLK / Bottom thread: female M28 (ELC10)
• Friction reducer / inclinometer housing with ring - Top thread: female AR / Bottom thread: female M28 (ELC10)
• Friction reducer / inclinometer housing with ring - Top thread: female 2R / Bottom thread: female M28 (ELC10)

• Friction reducer (L = 350 mm) with replaceable bush/ring - Top thread: fem. STD / Bottom thread: male STD (excl. bush/ring)
• Friction reducer (L = 350 mm) with replaceable bush/ring - Top thread: fem. AR / Bottom thread: male STD (excl. bush/ring)
• Friction reducer (L = 500 mm) with replaceable bush/ring - Top thread: fem. STD / Bottom thread: male STD (excl. bush/ring)
• Friction reducer (L = 500 mm) with replaceable bush/ring - Top thread: fem. AR / Bottom thread: male STD (excl. bush/ring)

• Bush for friction reducer (tempered steel)
• Ring for friction reducer (tempered steel)
• Extra charge for bush welded on friction reducer