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【Specification】 Overall Length: 20" (500mm); Effective Working Lengths: 18"(450mm); Connection: 1-1/4-7 UNC Thread; Extension Shape: Hexagon shank with 41mm wrench size (SW 41)
【Industrial Grade Materials】 Made from 42Cr4 Steel, it boasts double the strength and twice the service life compared to conventional materials.
【42Cr4 Steel (DIN 1.7045) 】42Cr4 Steel (DIN 1.7045) is a German standard material used for manufacturing various hot forming tools, hot stamping dies, and tool steel. This material is characterized by high strength, excellent toughness, reliable hardenability and outstanding impact resistance. It is widely utilized in machinery, shafts, gear shafts, wheels and industrial tools.
【Widely Applicable】Core drill bit extensions make it easy to quickly assemble diamond core drill bits, allowing for deeper drilling into concrete, reinforced concrete, brick, block, and masonry.
【Note】It only works with 1 1/4-inch UNC threads. Please pay attention to the thread of the core drill bit. This adapter cannot be used in hammer mode.

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Specifications
Connection: 1-1/4-7 UNC Thread
Overall Length: 8" (200mm) / 12"( 300mm ) / 16"( 400mm ) / 20"( 500mm )
Effective Working Lengths: 6"(150mm) / 10"(250mm)/ 14"(350mm) / 18“（450 mm）
Material: 42Cr4 Steel (DIN 1.7045)
Water Feed: Integrated through-hole enables continuous water supply during wet drilling
Extension Shape: Hexagon shank with 41mm wrench size (SW 41)
Finish: Black oxide coating

Mechanical Properties
Density: 7.7-8.03 ×10³ kg/m³
Poisson's Ratio: 0.27-0.30
Modulus of Elasticity: 190-210 GPa
Tensile Strength: 1158 MPa
Yield Strength: 1034 MPa
Elongation at Break: 15%
Area Reduction: 53%
Brinell Hardness: 35 HB

Thermal Properties
Thermal Conductivity: 42.7 W/m·K
Specific Heat Capacity: 477 J/kg·K

Physical Properties
Coefficient of Thermal Expansion: 16-17 ×10⁻⁶/K
Thermal Conductivity: 16 W/m·K
Specific Heat Capacity: 500 J/kg·K
Melting Temperature: 1370-1400 °C
Operating Temperature Range: -40°C to 500°C
Density: 8000 kg/m³
Electrical Resistivity: 0.7 Ω·mm²/m

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