Analog Rockwell Hardness Tester Phase II - Model 900-331

Key Features

• Tests all standard Rockwell hardness scales
• Supports commonly used HRA, HRBW, HRC, HRE, and HRF scales
• Direct analog dial reading
• Dead-weight test-force application
• Hydraulic dashpot force control
• Advanced, easy-to-operate design
• Engineered for sensitive and accurate hardness readings
• Rugged construction for laboratory and industrial use
• Suitable for heat-treating facilities, workshops, tool rooms, and inspection laboratories
• Phase II states conformity to ASTM E18
• Lifetime technical support provided by Phase II

Overview

The Phase II Model 900-331 Rockwell Hardness Tester is a rugged analog bench tester designed for reliable hardness testing across all standard Rockwell scales. It combines direct dial reading with a dead-weight force application system and hydraulic dashpot control for straightforward operation in heat-treating departments, tool rooms, machine shops, inspection laboratories, and manufacturing facilities.

The Model 900-331 operates with a 10 kgf minor load and selectable 60, 100, and 150 kgf major loads. It is designed to test commonly used scales including HRA, HRBW, HRC, HRE, and HRF, along with the additional standard Rockwell scales supported by the appropriate ball indenter and test load. Phase II states that the tester conforms to ASTM E18; customers requiring full conformance to the latest ASTM E18 specification should confirm the applicable configuration before ordering.

Applications

The Phase II 900-331 is suitable for hardness testing of:

• Hardened and heat-treated steel
• Tool steel
• Carbon and alloy steel
• Stainless steel
• Cast iron
• Copper alloys
• Aluminum alloys
• Malleable iron
• Bearing metals
• Case-hardened components
• Machined production parts
• Incoming raw materials
• Heat-treated components
• Finished manufactured parts

Actual material suitability depends on the selected Rockwell scale, indenter, material thickness, specimen geometry, and applied test force.

Industries Served

• Heat Treating
• Aerospace Manufacturing
• Automotive Manufacturing
• Metalworking
• Tool and Die
• Precision Machining
• Steel Processing
• Foundries
• Fabrication
• Quality Assurance
• Testing Laboratories
• Maintenance and Repair Facilities
• Educational and Research Laboratories

Included Accessories

• C-scale diamond indenter
• 1/16 in. ball indenter
• Three HRC test blocks
• One HRB test block
• 5.87 in. (150 mm) test table
• 2.5 in. (63 mm) flat anvil
• Standard V-anvil
• Accessory case
• Dust cover

Optional Accessories

Optional accessories available for the Model 900-331 include:

• NIST/ASTM-certified Rockwell hardness test blocks
• Replacement diamond indenters
• Replacement ball indenters
• Additional ball-indenter sizes
• Specialized anvils
• Hardness testing accessory kits

The indenter, ball diameter, and total test force must correspond to the Rockwell scale being tested.

Calibration & Verification

Routine performance verification should be completed with certified Rockwell hardness test blocks that match the scales and hardness ranges being used. The indenter, anvil, test-force system, dial reading system, and overall machine performance should be evaluated at intervals appropriate for the testing environment and applicable quality requirements.

WESTport can provide:

• Certified Rockwell hardness test blocks
• Replacement diamond and ball indenters
• Hardness tester calibration
• Verification and repair services
• Guidance selecting test blocks and accessories
• Technical support for hardness testing applications

Customers working under ASTM E18 or an internal quality system should establish verification and calibration intervals based on usage, environmental conditions, customer requirements, and applicable procedures.

Why Buy from WESTport?

WESTport provides more than the hardness testing machine itself. We help customers select the proper tester, indenters, hardness test blocks, and accessories for their application.

Customers rely on WESTport for:

• Experienced hardness testing support
• Certified Rockwell hardness test blocks
• Replacement indenters and anvils
• Calibration, verification, and repair services
• Assistance matching the proper scale to the material
• Responsive technical and customer support
• Complete hardness testing solutions from one source

Frequently Asked Questions

Which hardness scales can the Phase II 900-331 test?

The tester supports all standard Regular Rockwell hardness scales when equipped with the correct indenter and selected test load. Common scales include HRA, HRBW, HRC, HRE, and HRF.

Is the Model 900-331 analog or digital?

The 900-331 provides direct hardness readings through an analog dial gage.

What test loads are available?

The tester uses a 10 kgf minor load with selectable major loads of 60, 100, and 150 kgf.

How is the test force applied?

The Model 900-331 uses a dead-weight force-application system with hydraulic dashpot control.

What is the maximum vertical testing capacity?

The published vertical capacity is 6.7 inches.

What is the throat depth?

The published throat depth is 6.6 inches.

Are hardness test blocks included?

Yes. Phase II lists three HRC test blocks and one HRB test block among the included accessories.

Can WESTport supply replacement indenters and certified test blocks?

Yes. WESTport supplies certified Rockwell hardness test blocks, diamond indenters, ball indenters, anvils, and other hardness testing accessories.

Is this tester appropriate for production-floor use?

Yes. Phase II describes the Model 900-331 as a rugged tester suited for environments including heat-treating facilities, workshops, tool rooms, laboratories, and inspection departments.

Does the tester conform to ASTM E18?

Phase II states that the Model 900-331 conforms to ASTM E18. Phase II also advises customers seeking full conformance to the latest ASTM E18 specification to confirm the required configuration.

Explore our complete line of hardness testers and certified hardness test blocks, or call 1-888-400-4243 to speak with a hardness testing specialist.