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  • A2LA and PRI/Nadcap accreditation
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Our Customers Say:

“I wanted to say thank you to the LTI Team for all the support they have provided in our source inspections, as well as on expedited projects. It is nice to work with a group that not only has technical knowledge, but cares about getting the job done right the first time. I know I can count on the LTI team to help me in many situations. N.G.K. Metals looks forward to many more years of working with you.”

David Britt,
N.G.K. Metals Corp.


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Specimen Machining

Made to Order: Custom Machined Test Specimens

Test specimensWhen you require precision test specimens for destructive testing, Laboratory Testing Inc. can fill the order quickly and economically. The Machine Shop at LTI can prepare all specimens for destructive testing, including

  • Full spectrum of mechanical test specimens
  • Rough cutting and grinding for metallography samples
  • Chips for ICP analysis

We also prepare specimens for customers that do their own in-house testing.

Rely on LTI’s Qualifications

When you work with a qualified supplier, you can count on quality specimen and sample machining.

  • Machining is performed according to ASTM standards A370, E8, E23 and customer specifications.
  • Specimen machining is PRI Nadcap accredited.
  • LTI is on the NIST Qualified Manufacturers List for Charpy V-notch Impact verification specimens.

We use computerized numerical control (CNC) equipment to prepare the highest quality test specimens from metals, including metal matrix composites, hardened steels and nickel-base alloys, and from many plastics. Electrical discharge machining (EDM) services are also available.

Get the Most Efficient Turnaround

Our Machine Shop runs two work shifts to ensure fast completion of specimens, so there is no delay in the start of your testing order. We have the expertise, staff and equipment to quickly prepare a wide-range of test specimens, include the following:

  • Specimen machining milling processJominy
  • Flat Tensile
  • Round Tensile
  • Flat Fatigue
  • Izod Impact
  • Dynamic Tear
  • Stress Rupture
  • Stress Corrosion
  • Gleeble
  • Charpy V-Notch Impact
  • Compact Tension
  • Fracture Toughness
  • turning_specimensRound Compression
  • Hydrogen Embrittlement
  • Face, Root, & Side Bend
  • Rotating Beam & Low Cycle Fatigue
  • Frequency Severity (Steel Cleanliness)


  • ASTM A370
  • ASTM E8
  • ASTM E23

The Specimen Machining Process

The machining of most test specimens begins with the rough cutting of material to length on a saw. The specific type of specimen required, including shape and features, will dictate whether milling, turning and grinding are also part of the sample machining process. Round specimens require turning on a lathe, since rough-cut specimens are usually square in shape. Milling cuts away material to create flat, angular, curved or a combination of surfaces on the specimen. Grinding is the final step for some specimens that require more refining or a specific finish.

LTI Capabilities

  • Capabilities – all specimen machining and sample machining required for destructive testing
  • Materials – metals and many plastics
  • Accreditations/Approvals – PRI Nadcap accredited; NIST’s Qualified Manufacturers List for Charpy V-notch Impact verification specimens
  • Standards – ASTM A370, E8, E23

News & Articles

Specimen Machining for Destructive Testing