What is cost per cutting edge?

Cost per cutting edge is the insert price divided by the number of usable edges on that insert. A square insert with four edges at 8 EUR costs 2 EUR per edge, a triangle with three edges at the same price costs 2,67 EUR per edge. It is the fair way to compare inserts of different shapes and prices, instead of comparing sticker price alone.

How do you calculate tool cost per part?

Divide the tool life per edge (in minutes) by the cutting time per part to get parts per edge, then divide the cost per edge by parts per edge. Tool cost per part = (insert price / edges per insert) / (tool life per edge / cutting time per part). This is the number that actually drives your part cost, not the insert's unit price.

Why does a cheaper insert sometimes cost more per part?

Because unit price ignores edge count and tool life. A cheaper insert with fewer edges or shorter tool life can produce fewer parts per edge, so its real cost per part is higher than a pricier insert that lasts longer and cuts faster. Cost per edge and cost per part are the numbers to compare, not the price tag.

What operating hours should I use for an annual tooling-cost projection?

Use your actual annual spindle-on time for that machine or operation, not a generic default. A single eight-hour shift, five days a week, roughly 48 weeks a year, is close to 1,900 to 2,000 hours; two shifts roughly doubles it. If you do not know the real figure, your production or scheduling data will have it, and using the real number is what turns this from a rough estimate into a decision-grade one.

Does this calculator account for machine downtime or scrap cost?

No. This calculator isolates tooling economics only: cost per edge, cost per part, and an annual tooling-cost projection from insert price, edge count, tool life and cycle time. It does not model machine hourly rate, scrap, rework, or changeover time, which belong in a full part-cost model.

MATERIAL CROSS-REFERENCE · P HIGH-SPEED STEEL (CO)

M35 / 1.3243: one material, every designation.

HS6-5-2-5 is the same material your supplier may list as AISI M35 or JIS SKH55. This page maps the designations across standards and gives the ISO P-group machining starting point, brand-neutral.

EN · W.-Nr. · AISI/ASTM/UNS · JIS ISO 513 group P Free, no signup

01 · DESIGNATIONS

M35 / 1.3243 across the standards

System	Designation
EN (EU)	HS6-5-2-5
Werkstoffnummer	1.3243
AISI / ASTM / UNS (US)	AISI M35 (UNS T11335)
JIS (Japan)	SKH55

Compiled from the public standard designation systems (EN 10027, SAE/AISI, ASTM, UNS, JIS). Entries marked “nearest” are the closest commonly-cited counterpart, not a drop-in equivalent. Always verify against the material certificate.

02 · MACHINING

How HS6-5-2-5 machines

Cobalt HSS: annealed it cuts like M2 but slightly harder on the edge. As with all HSS, the hardened state belongs to grinding.

ISO group	Starting Vc (coated carbide, turning)	Feed fn
P P · Steel	150–350 m/min · 490–1150 sfm	0.1–0.5 mm/rev · .004–.020 ipr

Group-level starting range from our speeds & feeds guide; convert to RPM with the speeds & feeds calculator. Condition, subgroup and operation shift the number — the material page has the detail: ISO P · High-speed steel (Co).

Related materials: H13 / 1.2344 · D2 / 1.2379 · D3 / 1.2080 · O1 / 1.2510 · O2 / 1.2842 · P20 / 1.2311

Cost check · free · brand-neutral

Are you overpaying on the inserts you run in HS6-5-2-5? Paste your insert list and get a cost audit in about 30 seconds: cross-brand equivalents at the same ISO application position, and where you are likely overpaying. No signup, no sales call.

Run a free cost audit → Full human review · no saving, no charge

03 · FAQ

Common questions

What is the US equivalent of HS6-5-2-5?

HS6-5-2-5 (Werkstoffnummer 1.3243) corresponds to AISI M35 (UNS T11335). In JIS terms the counterpart is SKH55.

Which inserts and cutting data for HS6-5-2-5?

It is an ISO P-group material, so the starting window is 150–350 m/min · 490–1150 sfm at 0.1–0.5 mm/rev · .004–.020 ipr for coated-carbide turning, adjusted for condition and operation. For a grounded, brand-neutral pick — grade, geometry and cutting data across 13 brands — ask the advisor.

Are HS6-5-2-5 and M35 interchangeable on a drawing?

They designate the same composition under different systems, but the drawing standard governs: certificates, tolerances and delivery-condition requirements differ between standards even for equivalent chemistry. Substitute only with the certificate in hand.

Designation solved. Now the tooling question.

Knowing the material is half the job; picking the grade and cutting data for the operation is the other half. That is what the advisor does, grounded in catalog data and honest when there is no verified match.

Ask the advisor about HS6-5-2-5 → ISO P material guide All material cross-references