Rebound Hammer Anvil

Rebound Hammer Anvil — Calibration Reference for Schmidt Hammer

The Rebound Hammer Anvil is a precision calibration reference used to verify and standardise the rebound index (R-value) of Schmidt rebound hammers (N-type and L-type) before and after each test session as per IS 13311 Part 2, BS 1881 Part 202, and ASTM C805. The anvil is a hardened steel block of known mass and hardness — when the hammer strikes it, the displayed rebound value should fall within the manufacturer-specified tolerance (typically 80 ± 2 for N-type hammer on a standard anvil).

JS Civil Lab Solutions supplies rebound hammer anvils compatible with Schmidt N-type, L-type, Silver Schmidt, and equivalent hammers.

Specifications

• Material: Hardened tool steel, Rockwell HRC 60 ± 2
• Mass: ~16 kg (N-type anvil) / ~4 kg (L-type anvil)
• Rebound reference value: 80 ± 2 (N-type) / 80 ± 2 (L-type)
• Surface: Ground flat, polished impact face
• Mounting: Placed on concrete or flat solid surface for calibration
• Compatibility: Schmidt N-type, L-type, Silver Schmidt OS-8200, equivalent hammers
• Compliance: IS 13311 Part 2, BS 1881 Part 202, ASTM C805, EN 12504-2

Calibration Procedure

Place the anvil on a flat concrete floor or rigid base. Fire the hammer 5 times in the horizontal direction and discard the first reading. Average the remaining 4 readings. If the average differs from the reference value by more than ±2 units, the hammer requires factory recalibration. This check must be done at the start and end of each day’s testing per IS 13311 Part 2.

Order

Contact JS Civil Lab Solutions at +91 93596 24761. Specify hammer type (N or L) when ordering to ensure correct anvil mass and reference value.