Proceq RockSchmidt-Hammer ASTM D 5873 and ISRM

Abbey Spares and Supplies Ltd

The Proceq RockSchmidt is the world’s most advanced rebound hammer fully adapted specifically to the extremely varied rock testing applications.

The Proceq RockSchmidt incorporates statistical methods based on ASTM and ISRM recommendations and provides the user with the freedom to define his own statistical process for determining a rebound number.

Type N with standard impact energy ist most suited to field testing.
Type L with low impact energy as specified by ASTM for testing cores.

The following standards and guidelines apply to Rock 

ASTM D 5873 – Standard Test Method for Determination of Rock Hardness by Rebound Hammer Method. (Applicable for UCS between 1 MPa and 100 MPa.)

ISRM – Aydin A., ISRM Suggested method for determination of the Schmidt hammer rebound hardness: Revised version. Int J Rock Mech Mining Sci (2008), DOI:10.1016/j.ijrmms.2008.01.020.


  • Geomorphological applications which investigate the bulk hardness properties of a rock outcrop
  • Prediction of weathering grades
  • Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)
  • Correlation to Young’s Modulus
  • Prediction of penetration rates for tunnel boring machines and rotary drum cutters
  • Testing on cores and blocks

Product Variations

Type N: Standard impact energy, 2.207 Nm. Recommended for field work. For core testing ISRM recommend that cores should be at least moderate strength (>80 MPa) and at least T2 size (≥ 84mm).

Type L: Low impact energy, 0.735 Nm.

Recommended impact energy in the ASTM D 5873 standard for testing of cores. ISRM recommend for testing on cores of moderate strength and above of at least NX size (≥ 54mm).

Technical Data



RockSchmidt Brochure


Schmidt Hammer brochure

Impact energy
(N) 2.207 Nm, (L) 0.735 Nm
Hammer mass
115 g
Spring extension
75 mm (2.95″)
Plunger radius
25 mm (0.98″
Dimensions of housing
55 x 55 x 250 mm (2.16″ x 2.16″ x 9.84″)
570 g

Memory Data

No. of impacts in a series
Maximum 99
Memory capacity dependent on length of test series

400 series with 10 values per series
200 series with 20 values per series

Electrical data
17 x 71 pixels; graphic

Battery lifetime

>5000 impacts between charges
Charger connection
USB type B (5V, 100 mA)

Environmental conditions
Operating temperature
0 to 50°C
Storage temperature
-10 to 70°C