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ASTM D412 Die B Cutting Die – Dumbbell
Dumbbell Die B · Tensile specimen — built to ASTM D412. Hardened steel or economical ribbon steel.
Brand: Universal Grip | Model: UGC-CDH-D412-B / UGC-CDR-D412-B | ● Made to order
Cuts the ASTM D412 Die B dumbbell profile: 6 × 59 mm narrow section, 140 mm overall length
Two styles: hardened steel for 0–5 mm, ribbon steel for 0–3 mm
Integral ejector (hardened) or foam pad (ribbon) pushes each specimen free
Fits manual, pneumatic and hydraulic sample-cutting presses
Free test cuts on your material before you order
Custom profiles, multi-cavity dies and nick/notch features on request
Downloads: Ribbon Steel Die Data Sheet (PDF)
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Precision cutting die for ASTM D412 Die B dumbbell specimens
This Universal Grip die cuts the dumbbell Die B (tensile specimen) defined in ASTM D412: Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension. ASTM D412 determines tensile strength, elongation and modulus of vulcanized rubber and thermoplastic elastomers using die-cut dumbbells pulled at 500 mm/min. Die B is one of the standard straight-section dumbbell profiles cut from sheet stock.
We make it in two styles so the die suits the material you cut. The one-piece hardened steel die is machined from a single piece of steel and holds its edge on rigid & semi-rigid plastics, filled compounds, rubber, sheet & film from 0 to 5 mm thick. The ribbon steel (steel-rule) die uses a precision-bent hardened rule in a laser-cut plywood base with a foam ejection pad, an economical choice for rubber, elastomers, TPE, foams, soft plastics & films up to 3 mm. Both cut the same ASTM D412 Die B profile.
ASTM D412 Die B specimen dimensions
The die is cut to the nominal profile in ASTM D412: overall length (min) 140 mm, width of narrow section 6 ± 0.05 mm, length of narrow section 59 ± 2 mm, width of ends 25 ± 1 mm, transition radius (inner) 14 ± 1 mm and recommended thickness 2.0 ± 0.2 mm. Always check your current edition of the standard for tolerances and the test procedure.
Die B compared with other ASTM D412 dies
Die B: 6 × 59 mm narrow section, 140 mm overall length (this die)
Die B is the largest of the 4 ASTM D412 profiles we make, giving the longest narrow section for elongation measurement.
Where it is used
Typical uses for ASTM D412 Die B specimens include seals & O-rings, hoses & belts, tires & automotive rubber and TPE molded parts.
Cutting specimens with the die
Put the die on an arbor press or a pneumatic press, set your sheet on a nylon cutting plate and press through in one stroke; the ejector pushes the specimen out ready to test. No press yet? An adapter lets the die run on your universal testing machine. Send us a sample of your material and we will make test cuts free of charge, so you can confirm the edge quality before you order. Hardened dies can be re-sharpened with our die sharpening tool.
ASTM D412 Die B Cutting Die Specifications
STANDARD
ASTM D412 Die B
SPECIMEN
Dumbbell Die B
SPECIMEN TYPE
Tensile specimen
OVERALL LENGTH (MIN)
140 mm
WIDTH OF NARROW SECTION
6 ± 0.05 mm
LENGTH OF NARROW SECTION
59 ± 2 mm
WIDTH OF ENDS
25 ± 1 mm
TRANSITION RADIUS (INNER)
14 ± 1 mm
RECOMMENDED THICKNESS
2.0 ± 0.2 mm
HARDENED STEEL DIE
One-piece machined steel, 0–5 mm material, integral ejector plate
RIBBON STEEL DIE
Steel rule in plywood base, 0–3 mm material, foam ejection pad
PRESS COMPATIBILITY
Manual, pneumatic & hydraulic sample-cutting presses
PART NUMBERS
UGC-CDH-D412-B (hardened) · UGC-CDR-D412-B (ribbon)
Models & Options
Hardened Steel Cutting Die — One-piece machined, hardened and precision-finished; rigid & semi-rigid plastics, filled compounds, rubber, sheet & film; 0–5 mm; integral ejector plate; re-sharpenable (UGC-CDH-D412-B)
Ribbon Steel Cutting Die — Precision-bent hardened steel rule in a laser-cut plywood base with closed-cell foam ejection pad; rubber, elastomers, TPE, foams, soft plastics & films; 0–3 mm; economical, fast turnaround (UGC-CDR-D412-B)
Press mounting — Matched to your press make and model, or an adapter for your universal testing machine (Specify at order)
Custom features — Custom profiles, multi-cavity dies and nick/notch features on request (Custom)
What's Included
ASTM D412 Die B cutting die in your chosen style (hardened or ribbon steel)
Specimen ejection: integral ejector plate (hardened) or foam ejection pad (ribbon)
Mounting to suit your press — tell us the make and model
Data sheet with the nominal profile dimensions
Supported Test Standards
Compatible Grips & Fixtures
Arbor press — Benchtop press for cutting dumbbell specimens with this die
Sample die press — Specimen-preparation presses and tools
Pneumatic grips — Constant clamping force for rubber dumbbells and tear specimens
Roller grips — Self-tightening eccentric roller grips for elastomers
Die sharpening tool — Restore the cutting edge of a hardened steel die
Elastomer testing — Grips, fixtures and dies for rubber and TPE testing
“Customer quote”
Related Equipment
ASTM D412 Die A Cutting Die
Dumbbell · 12 × 59 mm narrow section
ASTM D412 Die C Cutting Die
Dumbbell · 6 × 33 mm narrow section
ASTM D412 Die D Cutting Die
Dumbbell · 3 × 33 mm narrow section
JIS K6251 Type 3 Cutting Die
Dumbbell No. 3 · 5.0 × 20 mm narrow section
ASTM D412 Die B Cutting Die FAQ
What is the ASTM D412 test used for?
ASTM D412 determines tensile strength, elongation and modulus of vulcanized rubber and thermoplastic elastomers using die-cut dumbbells pulled at 500 mm/min. Die B is one of the standard straight-section dumbbell profiles cut from sheet stock.
What are the ASTM D412 Die B specimen dimensions?
The die cuts the nominal ASTM D412 profile: overall length (min) 140 mm, width of narrow section 6 ± 0.05 mm, length of narrow section 59 ± 2 mm, width of ends 25 ± 1 mm, transition radius (inner) 14 ± 1 mm and recommended thickness 2.0 ± 0.2 mm. These values come from the standard; check your current edition for tolerances.
Hardened steel or ribbon steel: which ASTM D412 Die B die should I choose?
For most rubber and TPE sheet around 2 mm thick, the ribbon steel die is the economical choice. Choose hardened steel for filled or harder compounds, sheet up to 5 mm, or high daily volumes, since it lasts longer and can be re-sharpened.
Which press do I need for the ASTM D412 Die B die?
The die fits manual, pneumatic and hydraulic sample-cutting presses. On our arbor press it mounts with a lateral screw, and an adapter lets it run on a universal testing machine. Tell us your press make and model and we will match the mounting.
How do I grip and measure ASTM D412 Die B specimens?
Hold the wide ends in pneumatic grips or roller grips so the specimen is loaded straight along its axis.
Which other ASTM D412 dies do you make?
We also make cutting dies for Die A, Die C and Die D, each in hardened and ribbon steel.
Can you make test cuts on my material?
Yes. Send us a sample of your sheet and we will make test cuts free of charge, so you can see the edge quality and confirm the right die style before you order.
Can you make a custom or multi-cavity ASTM D412 Die B die?
Yes. We make custom profiles, multi-cavity dies and nick or notch features on request. Send the drawing or standard, your material and thickness, and your press model.