What are the standard diameters available for spiral augers under this code?

The standard nominal sizes are 50, 75, 100, 150, 200, 250, and 300 mm (Table 1).

What material is specified for the auger blades?

The blades are specified to be made from steel conforming to Grade St 42-S of IS 226 or an equivalent grade (Clause 3.1).

What is the standard shank size for these augers?

The shank is a square section measuring 20 x 20 mm to connect with extension rods (Clause 4.3).

Is this standard for mechanical or manual augers?

The specifications are primarily for manual augers used with extension rods and a T-piece for geotechnical site investigation.

IS 10442

: 1983

earth augers (Spiral type)

CurrentSpecializedSpecificationGeotechnical · Soil and Foundation Engineering

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This standard lays down the requirements for materials, dimensions, and manufacture of spiral type earth augers. These tools are used for advancing boreholes in soil for exploration and sampling purposes, particularly in cohesive soils.

earth augers (Spiral type)

Quick Reference Values

Standard Auger Nominal Sizes50, 75, 100, 150, 200, 250, 300 mm

Blade Material SpecificationSteel conforming to Grade St 42-S of IS 226

Shank Cross-Section20 x 20 mm square section

Overall Length for 100 mm Auger450 mm

Number of Spirals for 100 mm Auger1.5 turns

Minimum Blade Thickness3.15 mm

Practical Notes

The standard references IS 226 for steel, which has been withdrawn. Users should refer to its replacement, IS 2062, for equivalent steel grades like E250.

These augers are most effective in cohesive soils above the water table and are generally operated manually with extension rods.

Ensure the coupling on the shank is compatible with the extension rods and T-piece being used on site, as specified in other related standards.