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Steel Hardness Testers
> PTC® Steel Hardness Tester Drill Press or Mill Mounted C
415C with Steel Test Blocks
PTC® Steel Hardness Tester Drill Press or Mill Mounted C
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The Model 415C Metal Hardness Tester is
designed for use in machine shops, laboratories
and by inspection and quality control personnel,
heat treaters, tool and die makers, mechanics,
welders metallurgists, etc. This unique instrument
is the easiest and most economical way of grading
and checking various metals in the equivalent
Rockwell C Scale range of 20 to 67HRC.
The chassis is made from aerospace aluminum,
which houses a high precision displacement
gauge. The shank at the top is used to hold
the instrument in a mill, drill press, or lathe
chuck. The lower end contains the indenter
The impression made by the indenter in the
metal being tested is very small and is equivalent
to a superficial examination in size. The travel
of the indenter, caused by the resistance of the
metal sample surface, results in the dial readout
in equivalent Rockwell C Scale. Minimum sample
thickness is 0.025 for most materials. If the
indenter does not make a dimple on the opposite
side, the material is thick enough for accurate
The instrument comes complete with two Test
Blocks (316.29H & 316.29L), Hardness Conversion
Chart, and Carrying Case.
Range of 20 to 67 HRC (equivalent Rockwell C Scale)
Accuracy ±1.5 points
Direct Reading Analog Scale
Easily Mounts in Drill Press or Mill
Weight (instrument only) 12 oz. (340 g ) with case & block) 2 lb. 6 oz. (. 9 kg).
Shipping weight 4 lbs. (1.8 kg)
Length 6-3/4 in. (17.2 cm)
Depth 1 1/16 in. (2.7 cm)
Indicator Diameter 1 9/16 in. (4.0 cm)
This instrument has a factory-set preload and comes calibrated and ready to use. Due to the preload, the dial gauge does not read zero or align vertically at rest. Do not turn the dial indicator unless the unit needs to be reset.
Without removing the blue cap, insert the shank of the Model 415C securely into a 1/2 inch chuck in your mill, drill press, or lathe. A sturdy setup is essential for proper operation and long diamond life. The surface of the piece to be tested must be smooth, clean, and perpendicular to the long axis of the instrument. Allow sufficient clearance between the hardness tester and the drill press platform for the test block or sample being tested. Do not let the diamond indenter drag on the test block or test piece as the diamond will break.
The tester is shipped ready to use, however, a calibration check may be performed as needed. Insert a clean, smooth portion of the test block (supplied with the hardness tester) directly beneath the diamond tipped indenter in the base of the hardness tester.
All measurements must be made at least 3 diameters apart to avoid breaking the diamond indenter.
Remove the blue cap and carefully lower the quill or handle until the indenter contacts the test block surface. Then slowly increase the force until the base of the hardness tester makes full contact with the test block surface. While exerting sufficient force to hold the base of the hardness tester in full contact with the test block, and the gauge pointer steady, check to see that the tester reads the test block hardness. The block must be held in position firmly, any movement while a load is on the indenter will break the diamond tip.
When making tests, it is important that the test block or sample be properly supported on a heavy, flat surface. Per ASTM E-18, only the block's test surface with the PTC® mark should be used; this surface must not be reworked.
Raise the hardness tester and move the test block to an unused portion of the block. Run the test at least three times and adjust the rim of the gauge to set the dial at the average of the readings. This is very important, as minor hardness fluctuations may occur in even something as precise as a test block. Once this has been adjusted, the hardness tester is good for many consecutive readings before checking it against the test block again.
The Model 415C Hardness Tester is now calibrated at a known hardness value and again ready for use. Remove the test block and substitute the metal part to be tested. Remember, it is critical that the sample is held firmly and not allowed to shift or move during the test as the resulting motion will break the diamond. Carefully lower the drill press feed handle or quill until the diamond tipped indenter rests on the sample s surface, then slowly increase the force until the base of the hardness tester fully contacts the metal s surface. Read the equivalent Rockwell C Scale hardness directly on the dial. Make several readings and average the results.
PTC® can certify steel hardness blocks using NIST traceable standards for a nominal cost. Test results include five tests and the average value of the block.
PTC® Steel Hardness Tester Drill Press or Mill Mounted B
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