California Bearing Ratio Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-STLE-13057
Quick Answer: The California Bearing Ratio Apparatus is a hand operated load frame of 5000 kg capacity with high and low lead screw travel rates, supplied with a 150 mm internal diameter × 175 mm high mould, a 50 mm face diameter penetration piston, proving ring and dial gauge, for CBR tests on soil.
Last updated: October 2026
Key Features
- Hand operated load frame, capacity 5000 kg, with high and low rates of travel of the lead screw
- Gun metal or brass mould, 150 mm internal dia × 175 mm high, with perforated base plate and 50 mm high extension collar
- Penetration piston with a 50 mm face diameter and an adjustable bracket for the penetration dial gauge
- Annular and slotted metal weights of 2.5 kg each, 147 mm dia
- Rammers of 2.6 kg (310 mm drop) and 4.89 kg (450 mm drop), with a cutting collar
- Supplied with proving ring and dial gauge
Technical Specifications
| Specification | Value |
|---|---|
| Load frame | Hand operated, capacity 5000 kg, high and low rates of travel of lead screw |
| Mould | Gun metal or brass, 150 mm internal dia × 175 mm high, with perforated base plate and extension collar 50 mm high |
| Penetration piston | Face dia 50 mm, with adjustable bracket for penetration dial gauge |
| Spacer disc | Circular metal, 148 mm dia × 47.7 mm high, with detachable handle |
| Surcharge weights | Annular metal weight, 2.5 kg, 147 mm dia with 53 mm dia central hole; slotted metal weight, 2.5 kg, 147 mm dia |
| Perforated plate | Gun metal or brass, 148 mm dia, with adjustable stem, lock nut and metal tripod for dial gauge |
| Rammers | 2.6 kg with 310 mm drop; 4.89 kg with 450 mm drop; cutting collar |
| Also supplied | Proving ring and dial gauge |
About This Product
The California bearing ratio (CBR) test compares the load needed to push a standard piston into a compacted soil sample with the load needed for a reference material. It is widely taught in highway and soil mechanics courses because the result is used to judge the strength of a soil as a road subgrade. The soil is compacted in the mould with a rammer, loaded with surcharge weights, and the piston is pressed in at a steady rate while the proving ring and dial gauge are read.
Frequently Asked Questions
Q1. What size is the mould of the California Bearing Ratio Apparatus?
The mould is made from gun metal or brass, 150 mm in internal diameter and 175 mm high, with a perforated base plate and an extension collar 50 mm high.
Q2. Which rammers are listed?
A rammer of 2.6 kg weight with a drop of 310 mm and a rammer of 4.89 kg with a drop of 450 mm are listed.
Q3. Are the proving ring and dial gauge included?
Yes. The apparatus is supplied with a proving ring and dial gauge.
Related: Soil Testing Lab Equipment, Proctor Compaction Test Apparatus, Soil Cone Penetrometer, Sand Pouring Cylinder.
For a quotation on the California Bearing Ratio Apparatus, contact School Lab Equipment India.