Home › Products › Cutting Dies › JIS K6251 Type 4 Cutting Die
JIS K6251 Type 4 Cutting Die – Dumbbell No. 4
Dumbbell No. 4 · Tensile specimen — built to JIS K6251. Hardened steel or economical ribbon steel.
Brand: Universal Grip | Model: UGC-CDH-JISK6251-T4 / UGC-CDR-JISK6251-T4 | ● Made to order
Cuts the JIS K6251 Type 4 dumbbell No. 4 profile: 5.0 × 20 mm narrow section, 100 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)
Trusted by Global Companies
Precision cutting die for JIS K6251 Type 4 dumbbell No. 4 specimens
This Universal Grip die cuts the dumbbell No. 4 (tensile specimen) defined in JIS K6251: Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties. JIS K6251 specifies how to measure tensile strength, elongation at break and stress at given elongation of vulcanized and thermoplastic rubbers using die-cut dumbbells. Dumbbell No. 4 has the same 5 mm by 20 mm narrow section as No. 3 but a larger transition radius and is intended for thin sheet of 1 mm or less.
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 JIS K6251 Type 4 profile.
JIS K6251 Type 4 specimen dimensions
The die is cut to the nominal profile in JIS K6251: overall length (approx.) 100 mm, width of ends 25 mm, width of narrow section 5.0 ± 0.1 mm, length of narrow section 20 mm, transition radius 40 mm, gauge length 20 ± 0.5 mm and recommended thickness 1.0 mm or less. Always check your current edition of the standard for tolerances and the test procedure.
Type 4 compared with other JIS K6251 dies
Type 4: 5.0 × 20 mm narrow section, 100 mm overall length (this die)
Type 4 sits mid-range among the 8 JIS K6251 profiles we make.
Where it is used
Typical uses for JIS K6251 Type 4 specimens include tire and belt compound QC, seals, gaskets and O-ring materials, hose and molded rubber goods and elastomer R&D and incoming inspection.
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.
JIS K6251 Type 4 Cutting Die Specifications
STANDARD
JIS K6251 Type 4
SPECIMEN
Dumbbell No. 4
SPECIMEN TYPE
Tensile specimen
OVERALL LENGTH (APPROX.)
100 mm
WIDTH OF ENDS
25 mm
WIDTH OF NARROW SECTION
5.0 ± 0.1 mm
LENGTH OF NARROW SECTION
20 mm
TRANSITION RADIUS
40 mm
GAUGE LENGTH
20 ± 0.5 mm
RECOMMENDED THICKNESS
1.0 mm or less
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-JISK6251-T4 (hardened) · UGC-CDR-JISK6251-T4 (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-JISK6251-T4)
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-JISK6251-T4)
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
JIS K6251 Type 4 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 No. 4 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
Marking tool — Repeatable 20 mm gauge marks for video extensometers
Elastomer testing — Grips, fixtures and dies for rubber and TPE testing
“Customer quote”
Related Equipment
JIS K6251 Type 1 Cutting Die
Dumbbell No. 1 · 10.0 × 40 mm narrow section
JIS K6251 Type 2 Cutting Die
Dumbbell No. 2 · 10.0 × 20 mm narrow section
JIS K6251 Type 3 Cutting Die
Dumbbell No. 3 · 5.0 × 20 mm narrow section
JIS K6251 Type 5 Cutting Die
Dumbbell No. 5 · 6.0 × 33 mm narrow section
JIS K6251 Type 4 Cutting Die FAQ
What is the JIS K6251 test used for?
JIS K6251 specifies how to measure tensile strength, elongation at break and stress at given elongation of vulcanized and thermoplastic rubbers using die-cut dumbbells. Dumbbell No. 4 has the same 5 mm by 20 mm narrow section as No. 3 but a larger transition radius and is intended for thin sheet of 1 mm or less.
What are the JIS K6251 Type 4 specimen dimensions?
The die cuts the nominal JIS K6251 profile: overall length (approx.) 100 mm, width of ends 25 mm, width of narrow section 5.0 ± 0.1 mm, length of narrow section 20 mm, transition radius 40 mm, gauge length 20 ± 0.5 mm and recommended thickness 1.0 mm or less. These values come from the standard; check your current edition for tolerances.
Hardened steel or ribbon steel: which JIS K6251 Type 4 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 JIS K6251 Type 4 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 JIS K6251 Type 4 specimens?
Hold the wide ends in pneumatic grips or roller grips so the specimen is loaded straight along its axis. The gauge length is 20 ± 0.5 mm; our marking tool applies repeatable gauge marks for video extensometers.
Which other JIS K6251 dies do you make?
We also make cutting dies for Type 1, Type 2, Type 3, Type 5, Type 6, Type 7 and Type 8, 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 JIS K6251 Type 4 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.