- Jai Bhavani Nagar, Wagle Industrial Estate, Thane West, Thane, Maharashtra 400604
The Finetech Engineering Dumbbell Specimen Cutter is a precision die cutting tool used to prepare standard dumbbell-shaped (dogbone) test specimens for tensile strength testing. Accurate specimen preparation is the foundation of reliable tensile test results — if the specimen dimensions are inconsistent, even the best universal testing machine will produce unreliable data.
Our dumbbell cutters are manufactured from hardened tool steel (50–56 HRC) with precision-ground internal cutting edges, ensuring clean, burr-free cuts with exact dimensional accuracy. The cutting edge geometry is machined to match the exact profile specified in the relevant standard — whether that is ASTM D412 for rubber and elastomers, ASTM D638 for rigid and semi-rigid plastics, or ISO 37 for vulcanised rubber.
Each cutter is designed to be used with a hydraulic press, manual press, or pneumatic press to punch through sheet material cleanly and consistently. Finetech Engineering manufactures these cutters in-house at our Thane facility, which means we control dimensional accuracy from raw material to final inspection — and can offer NABL-traceable certification for customers who require it.
Parameter | Specification |
Product Name | Dumbbell Specimen Cutter (Dogbone Die Cutter) |
Standards Supported | ASTM D412 (Die A, B, C, D, E, F)ASTM D638 (Type I, II, III, IV, V)ISO 37 (Type 1, 1A, 2, 3, 4)IS 3400 (Part 1) |
Blade Material | Hardened tool steel (EN-31 / equivalent) |
Blade Hardness | 50–56 HRC |
Cutting Edge Finish | Precision ground and polished (minimum 5 mm from edge per ASTM D412) |
Body Material | Mild steel (MS) body with machined handle |
Operation | Used with Hydraulic Press / Manual Press / Pneumatic Press |
Surface Treatment | Chrome plated / powder coated (as per model) |
Certification | NABL-traceable certification available (dimensional verification) |
Custom Sizes | Available as per customer drawing or specific standard requirement |
Die Type | Overall Length (mm) | Narrow Section Width (mm) | Narrow Section Length (mm) | Gauge Length (mm) |
Die A | 101.6 | 6.35 | 31.75 | 25.4 |
Die B | 152.4 | 6.35 | 31.75 | 25.4 |
Die C (Most Common) | 115 | 6 | 33 | 25 |
Die D | 115 | 3 | 16 | 12 |
Die E | 101.6 | 12.7 | 31.75 | 25.4 |
Die F | 63.5 | 4.76 | 9.53 | 7.62 |
Specimen Type | Overall Length (mm) | Narrow Section Width (mm) | Gauge Length (mm) | Thickness (mm) |
Type I (Preferred) | 165 | 13 | 50 | ≤7 |
Type II | 183 | 6 | 50 | ≤7 |
Type III | 246 | 19 | 50 | 7–14 |
Type IV | 115 | 6 | 25 | ≤4 |
Type V (Micro) | 63.5 | 3.18 | 7.62 | ≤4 |
Specimen Type | Overall Length (mm) | Narrow Section Width (mm) | Gauge Length (mm) |
Type 1 | 115 | 6 | 25 |
Type 1A | 100 | 5 | 20 |
Type 2 | 75 | 4 | 12 |
Type 3 | 50 | 4 | 10 |
Type 4 (Micro) | 35 | 2 | 10 |
Manufactured in-house: We don’t trade or resell — every cutter is manufactured at our Thane facility. This means we control quality from raw material to final inspection.
NABL certification available: We provide NABL-traceable dimensional certification for specimen cutters — essential for labs participating in government tenders (GeM), NABL-accredited labs, and export-facing manufacturers.
Custom sizes: Need a non-standard dumbbell size or a die that matches a client-specific drawing? We manufacture custom specimen cutters to your exact requirements.
Re-sharpening service: Over time, cutting edges dull with repeated use. We offer re-sharpening and re-certification services to extend the life of your cutters.
Customisation available
A dumbbell specimen cutter (also called a dogbone die cutter or tensile specimen cutting die) is a precision tool used to cut standardised dumbbell-shaped test specimens from flat sheets of rubber, plastic, or elastomer material. The dumbbell shape ensures that when the specimen is pulled in a tensile testing machine, it breaks in the narrow gauge section — not at the grips — giving accurate and repeatable results.
It depends on your material. ASTM D412 is for vulcanised rubber and thermoplastic elastomers (flexible, stretchy materials). ASTM D638 is for rigid and semi-rigid plastics (hard or semi-hard materials like HDPE, PVC, nylon). If you test both rubber and plastic, you will need cutters for both standards.
For rubber testing, ASTM D412 Die C is the most widely used dumbbell cutter globally. It has an overall length of 115 mm, a narrow section width of 6 mm, and a gauge length of 25 mm. For plastic testing, ASTM D638 Type I (165 mm overall length, 13 mm narrow width, 50 mm gauge length) is the preferred specimen.
Yes. Finetech Engineering offers NABL-traceable dimensional certification for specimen cutters. This verifies that the cutting die conforms to the exact dimensional tolerances specified in the relevant ASTM or ISO standard. NABL certification is increasingly required by accredited labs, government tender participants, and export-facing manufacturers.
Dumbbell cutters are used with a hydraulic press, manual press, or pneumatic press. The press provides the downward force needed to punch the cutter cleanly through the sheet material. Finetech Engineering manufactures all three types of presses — ask us for a combined quote if you need a cutter and press together.
Yes. If your testing standard requires a non-standard specimen size, or if you have a client-specific drawing, we can manufacture custom dumbbell cutters to your exact dimensions. Contact us with your requirements.
This depends on usage volume and the hardness of the materials being cut. As a general guideline, cutting edges should be inspected every 6–12 months. A simple check: if your tensile specimens consistently break at the same point near the edge of the gauge section (not in the centre), the cutter may be dull, nicked, or bent. Finetech offers re-sharpening and re-certification services.
They are the same thing. “Dumbbell cutter” and “dogbone cutter” are two names for the same type of specimen cutting die. The shape resembles both a dumbbell and a dog bone. In India, “dumbbell cutter” is the more common term; internationally, “dogbone” is also widely used.
