Grade
Higher cobalt content in the alloy lifts raw-material cost and adds process control. Grade is usually the single biggest lever in the quote.
Kayolo publishes no list price for the M42 High-Cobalt Drill Bit, which means every drill price has to be built from a specification. That is normal for a made-to-order cutting tool: alloy grade, diameter, surface treatment, tolerance class, order quantity and freight all move the number, and they move it by different amounts for every buyer. This page explains what actually drives that quote and what to put in an RFQ, so that when you compare drill manufacturers you are comparing the same specification instead of two unrelated headline figures.
Six inputs decide almost every line item. Read them in this order and your RFQ starts on the right footing.
Higher cobalt content in the alloy lifts raw-material cost and adds process control. Grade is usually the single biggest lever in the quote.
Larger diameters remove more material and need more grinding stock. The smallest diameters pay a premium for handling instead.
Surface treatments add deposition steps and cycle time. Specify only the treatment the workpiece actually demands.
Tighter diameter, straightness and runout limits mean more gauging and more scrap, so the quote follows the tolerance class you ask for.
Setup, first-article checks and tooling are spread across the batch. Higher quantities carry a lower unit rate.
Packing, Incoterms, freight mode and destination charges land on the unit cost of a dense, comparatively low-value item.
Anchor your RFQ to the exact catalogue entry before you discuss money. These are the identifiers the quote should repeat back to you.
The product page does not state cobalt percentage, coating, shank type, point angle, tolerance or a compliance standard. Treat any figure in those fields as something to have confirmed on the quote, not assumed from the grade name.
Relative index only — this is a ranking of alloy position, not a currency figure and not a published price list.
Standard high-speed steel. Lowest alloy content and the easiest to grind, so it sits at the reference point of the ladder.
Cobalt-alloyed steel in the middle of the family. More heat resistance than plain HSS, and a step up in material and processing cost.
The high-cobalt end of the ladder and the grade of product No.025. Higher alloy content, tighter heat treatment and slower grinding put it at the top of the index.
Ladder position is a cost question, not a quality question. Mild steel and short-run work are usually served by the lower rungs; stainless and harder ferrous work is where the climb to M42 is easier to justify on tool life. Decide the rung before you ask for a rate.
The published size table carries three columns — Size, Blade Length and Overall Length. Units are not stated on the page, so use the numbers as a relative shape rather than absolute dimensions.
Overall Length as published, plotted against the Size column from 0.30 to 12.60.
Minimum stock removal, maximum handling. Yield loss, grinding time and breakage risk concentrate here.
The volume band most production drilling sits in, with predictable processing and the easiest quoting.
More material per piece, but more predictable grinding and inspection, so the per-unit premium eases.
Unit rate is the number a purchasing sheet wants. Cost per hole is the number that actually decides whether the grade is worth paying for.
Fix one material — 304 stainless — so every bit is judged on the same job.
Hold speed, feed and pecking schedule constant. Change one variable at a time or the comparison collapses.
Agree in advance what counts as end of life: hole diameter drift, hole quality or audible change.
Run to the limit and record the verified count. This is the only figure that should enter the division.
Divide bit cost by hole count. A higher-priced bit that survives longer can still win on cost per hole.
A controlled feed with regular pecking keeps chips clear and heat down, which usually extends verified hole count. Aggressive feed raises output per minute but shortens bit life, so agree the cutting regime with the supplier before the test rather than after the result.
Match your application to the specification you should write on the RFQ, then check the quote against the confirmation column.
| Scenario | Specify | Confirm in the quote |
|---|---|---|
| Production drilling in 304 stainless | M42 high-cobalt grade, controlled feed with pecking, coolant through the operation | Grade and any coating in writing, plus a first-article sample before the volume run |
| Micro-hole work in the 0.30 – 1.00 band | The smallest published sizes, high spindle speed, rigid holders, minimal runout | Breakage allowance, replacement terms and the current size list for that band |
| Plant maintenance and MRO restocking | A mixed-diameter assortment sized to your common repairs, with repeat-order pricing | Quantity tiers, reorder lead time and pack quantity per size |
| Multi-metal job shop | One grade that covers stainless and alloy steel, or a split between the ladder rungs | Whether a single grade covers every job, or whether the lower rung is enough for mild steel |
| Distributor or private-label programme | Box quantities, label artwork and carton marking alongside the drill specification | Private-label MOQ, artwork approval steps and packing cost as separate line items |
Send the nine RFQ fields and the application detail — material, diameter band, quantity and destination — and the quote comes back against a fixed specification instead of a range. Bulk volumes, sample lots, private label and custom packaging are all handled through the same request path.
Keep adjacent product options together for a faster catalog comparison.
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View productthe product page shows no price, price range or currency. ordering runs through a get a quote request and account sign-in rather than a cart, so your price is built from grade, diameter, tolerance, quantity and delivery requirements.
the published table runs from 0.30 to 12.60 in the size column, with blade length and overall length columns alongside it. the page does not state the units, and the table shows two conflicting 1.40 rows plus a truncated final row, so confirm the current size list in writing with your quote.
grade and diameter usually dominate, because they set the alloy content and the amount of material that has to be ground and inspected. coating, tolerance class, order quantity, packaging and freight then adjust the total up or down.
minimum order quantity is not stated on the product page, so treat it as quote-based. ask specifically for a sample lot or a first-article check before you commit to a production volume.
the product page does not list packaging or private-label options. request them as separate line items — box quantity, label artwork and carton marking — so they appear in the written quote instead of being added later.
align the specification and quantity first: same grade, diameter, tolerance, coating, packaging and incoterms. only then compare unit rate, expected tool life and delivery terms, because a lower unit rate on a different specification is not a like-for-like comparison.