Phase2+ 900-420/900-440 Superficial Digital Rockwell Hardness Tester
The Phase2+ 900-420 and 900-440 are large-frame, motorized digital hardness testers built for high-throughput laboratory and production QC environments that demand precise, repeatable superficial Rockwell testing on a heavy-duty platform. Both models use a closed-loop load cell system in place of traditional dead weights, eliminating the mechanical variability, drift, and maintenance overhead of conventional weight-and-lever designs. The result is a high-speed test cycle with extremely accurate force application that delivers consistent results shift after shift, operator after operator.
The 900-420 is a dedicated Superficial Rockwell tester covering all HRN and HRT scales across 15, 30, and 45 kgf major load levels. It is the purpose-built choice for labs and production lines that exclusively test thin sheet metal, case-hardened or nitrided surfaces, coated parts, and soft non-ferrous materials applications where standard Rockwell loads would either over-penetrate or damage the specimen. The 900-440 is the Twin model: it retains the full superficial Rockwell capability of the 900-420 while adding complete standard Rockwell coverage (HRA, HRB, HRC, and the full range of ball-scale loads at 60, 100, and 150 kgf), making it a single instrument that eliminates the need for two separate benchtop testers in mixed-material inspection environments.
Both instruments are governed by a micro-computer controlled touchscreen interface that manages the entire automated load/unload cycle through a one-touch testing sequence. The system supports programmable dwell times, upper and lower limit settings, test counters, and statistical output. Results display on a high-definition LCD with automatic conversion to HB, HV, and all applicable Rockwell and Superficial Rockwell scales. USB output transfers data directly to a flash drive for records, SPC integration, and reporting without requiring a PC connection at the instrument. Both models comply with ASTM E18, and are available with ASTM E18-20 certification for customers in regulated industries requiring documented instrument traceability.
With an 8.0" vertical capacity, 7.8" throat depth, and a shared 175-lb frame, both testers accommodate a wide range of part geometries and fixturing configurations, and are compatible with optional long-shank ball indenters and an extra-large 9.84" diameter flat anvil for oversized workpieces.
Key Features
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Two Models for Different Scope - Superficial-Only or Full Twin Coverage - The 900-420 covers all Superficial Rockwell scales (HRN, HRT, W, X, Y) at 15/30/45 kgf, ideal for dedicated thin-material inspection lines. The 900-440 Twin adds complete standard Rockwell coverage (HRA, HRB, HRC, HRD, HRE, HRF, and all ball scales at 60/100/150 kgf), eliminating the need for two separate instruments in mixed-material QC labs.
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Closed-Loop Load Cell Replaces Dead Weights for High-Accuracy Force Control - Direct motorized loading via a precision closed-loop load cell delivers tightly controlled force application across all test loads, eliminating the calibration drift, mechanical wear, and inconsistency of traditional dead-weight and lever systems for long-term measurement reliability.
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Micro-Computer Touchscreen with Fully Automated Load/Unload Cycle - The one-touch test sequence handles complete motorized load application and removal without operator intervention, removing the primary source of human variability in Rockwell testing; programmable dwell times, scale selection, and upper/lower limit settings adapt the tester to specific material and inspection requirements.
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Automatic Conversion to HB, HV, and All Rockwell/Superficial Scales - Results display instantly on a high-definition LCD with automatic cross-conversion to Brinell (HB), Vickers (HV), and all applicable Rockwell and Superficial Rockwell hardness scales, eliminating manual lookup tables and reducing transcription errors in high-volume inspection workflows.
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USB Output to Flash Drive with Statistical Capabilities - Built-in USB port transfers test data directly to a flash drive for SPC analysis, records management, and audit trail documentation without requiring a tethered PC at the instrument; test counter and configurable pass/fail limits support structured inspection protocols and production floor QC requirements.
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Large 8.0" Vertical Capacity and 7.8" Throat Depth on a Shared 175-lb Frame - The generous working envelope accommodates tall parts, thick workpieces, and a wide variety of anvil and fixturing configurations; optional long-shank ball indenters and an oversized 9.84" flat anvil extend compatibility to large-format specimens not addressable on standard-frame testers.
Specifications
| Specification |
900-420 (Superficial) |
900-440 (Twin - Rockwell + Superficial) |
| Test Type |
Superficial Rockwell |
Standard Rockwell + Superficial Rockwell |
| Minor Load |
3 kgf |
3 kgf (Superficial) / 10 kgf (Rockwell) |
| Major Load |
15 kgf, 30 kgf, 45 kgf |
15 / 30 / 45 kgf (Superficial) + 60 / 100 / 150 kgf (Rockwell) |
| Test Force Application |
Load Cell, Closed Loop |
Load Cell, Closed Loop |
| Test Force Control |
Motorized |
Motorized |
| Superficial Scales |
15N, 30N, 45N, 15T, 30T, 45T, 15W, 30W, 45W, 15X, 30X, 45X, 15Y, 30Y, 45Y |
15N, 30N, 45N, 15T, 30T, 45T, 15W, 30W, 45W, 15X, 30X, 45X, 15Y, 30Y, 45Y |
| Standard Rockwell Scales |
— |
HRA, HRB, HRC, HRD, HRE, HRF, HRG, HRH, HRK, HRL, HRM, HRP, HRR, HRS, HRV |
| Automatic Conversions |
HB, HV, Popular Rockwell Scales |
HB, HV, All Rockwell + Superficial Rockwell Scales |
| Display |
Hi-Definition LCD Digital Readout |
Hi-Definition LCD Digital Readout |
| Resolution |
0.1 HR |
0.1 HR |
| Vertical Capacity |
8.0" |
8.0" |
| Throat Depth |
7.8" |
7.8" |
| Programmable Functions |
Dwell time, scale selection, upper/lower limits, test counter, statistical output |
Dwell time, scale selection, upper/lower limits, test counter, statistical output |
| Data Output |
USB to Flash Drive |
USB to Flash Drive |
| Standard Compliance |
ASTM E18 (E18-20 certification available) |
ASTM E18 (E18-20 certification available) |
| Operating Temperature |
50°–95°F (10°C–35°C) |
50°–95°F (10°C–35°C) |
| Power Supply |
Single phase AC, 110–220V (manual change), 50–60 Hz, 4A |
Single phase AC, 110–220V (manual change), 50–60 Hz, 4A |
| Height |
22" |
22" |
| Width |
8" |
8" |
| Depth |
31" |
31" |
| Weight |
175 lbs |
175 lbs |
| Superficial Rockwell Scale Reference (Both Models) |
| Scale |
Indenter |
Preliminary Force |
Total Force |
Typical Application |
| 15N / 30N / 45N |
Spheroconical Diamond |
29.42 N (3 kgf) |
147.1 / 294.2 / 441.3 N |
Thin case-hardened, nitrided, and carburized surfaces — analogous to A, C, D scales |
| 15T / 30T / 45T |
1/16" Carbide Ball |
29.42 N (3 kgf) |
147.1 / 294.2 / 441.3 N |
Thin sheet metal, strip stock — analogous to B, F, G scales |
| 15W / 30W / 45W |
1/8" Carbide Ball |
29.42 N (3 kgf) |
147.1 / 294.2 / 441.3 N |
Very soft materials |
| 15X / 30X / 45X |
1/4" Carbide Ball |
29.42 N (3 kgf) |
147.1 / 294.2 / 441.3 N |
Very soft materials |
| 15Y / 30Y / 45Y |
1/2" Carbide Ball |
29.42 N (3 kgf) |
147.1 / 294.2 / 441.3 N |
Very soft materials |
Items Included
| Item |
900-420 |
900-440 |
| Diamond Indenter |
N-scale Spheroconical |
C/N-scale Spheroconical |
| Ball Indenter |
1/16" Ball Indenter |
1/16" Ball Indenter |
| HRN Test Blocks |
3 |
2 |
| HRT Test Blocks |
1 |
3 |
| HRC Test Blocks |
— |
2 |
| HRB Test Block |
— |
1 |
| Test Table |
5.87" (150mm) |
5.87" (150mm) |
| Flat Anvil |
2.5" (63mm) |
2.5" (63mm) |
| V-Anvil |
Standard V-Anvil |
Standard V-Anvil |
| Dust Cover |
✓ |
✓ |
| Accessory Case |
✓ |
✓ |
Phase2+ 900-420 Superficial Digital Rockwell Hardness Tester User Manual
Phase2+ 900-420 Superficial Digital Rockwell Hardness Tester Catalog
Phase2+ 900-440 Superficial Digital Rockwell Hardness Tester Manual
Phase2+ 900-440 Superficial Digital Rockwell Hardness Tester Catalog
