COMPANY PRODUCT

1. The hardness is one of the important criteria of the mechanical functions of the materials, and the hardness test is the important means to judge the quality of the metallic materials or parts.
2. The manual Superficial Rockwell hardness fester is a popularly-used hardness testing instrument to measure the Rockwell hardness of the materials. The speed of loading the test force is regulated by the buffer whereas the change of the test force is made by rotating the carriage-changing hand-wheel. The operation of the present instrument is simple, its functions are stable, and its use is, therefore, widely spread.
 
Technical specifications
1. The initial test force:  29.42N (3kg);  Tolerance: ±2.0%
2. The total test force:  147.1N (15kg), 294.2N (30kg), 441.3N (45kg);  Tolerance: ±1.0%
3. The specifications of the indenter:
3.1  Diamond Rockwell indenters
3.2  Ball indenters φ1.5875mm
4. The max height of the specimens:  175mm
5. The distance from the center of the indenter to the instrument body:  165mm
6. The total dimension of the tester:   520×215×700 (mm)
7. The total weight of the tester:    73kg
8. The allowed tolerances of the indicated values of the hardness tester 

Scale	Hardness of Standard Blocks	Display Tolerance
15N	（70~94） HR 15N	±2 HRN
30N	（42~86） HR 30N
45N	（20~77） HR 45N
15T	（67~93） HR 15T	±3 HRT
30T	（29~82） HR 30T
45T	（10~72） HR 45T

9. The Scales, Indenters, Test Force Values and Application Fields of the Superficial Rockwell Hardness Tests.

Scale	Indenter Type	Initial Test Force	Total Test Force（N）	Applications
HR15N	Diamond Indenter	29.42 N （3kg）	147.1(15)	Hard alloy steel, nitride steel, carburized steel,  various heavy steel plate, etc
HR30N			294.2(30)	Surface-quenched steel, carburized steel,  knife, thin steel plate, etc
HR45N			441.3(45)	Quenched steel, tempered steel, hard cast iron  and edge of parts, etc
HR15T	Ball Indenter      φ1.5875mm（1/16 inch）		147.1(15)	Annealed copper alloy, brass、bronze plate,   mild steel sheet
HR30T			294.2(30)	Mild steel sheet, aluminum alloy, copper alloy,  brass and bronze, malleable cast iron,
HR45T			441.3(45)	Pearlite iron, copper -nickel alloy and zinc-nickel alloy plate