What kind of wire runs best on drill point dies?

Point forming needs workable wire, so we care most about the annealed condition. Common self-drilling screw wires such as annealed 1022A and 10B21 are medium-carbon / boron grades that balance strength potential and formability well; softer low-carbon steels form easily but top out lower on strength, while harder medium-carbon alloy steels resist forming more and demand more from the dies and machine. Actual fit still depends on your screw spec, spheroidization, machine setup and trial forming.

If I select wire to this mechanical-properties table, does it guarantee good point forming?

No. This is acceptance data from the wire mill: it means a lot falls inside a usable band, not that a value is the single, validated optimum for your line. Two lots inside the same band can still form differently because of spheroidization or annealing uniformity, so the final call comes from first-article trials and batch performance. The table's value is reference and screening, not a guarantee of results.

How does wire that is too hard or too soft affect drill point dies?

Wire that is too hard or too high in tensile strength raises forming resistance — it may underfill, crack, shorten die life, or even chip the die. Wire that is too soft can give underfilled profiles and unstable dimensions. Spheroidization, lubrication, machine tonnage, speed and die adjustment all affect the real outcome too, so no single number tells the whole story.

What data should I give a die or process partner to evaluate wire for point forming?

Provide the full set where possible: material grade, annealed condition, hardness, tensile strength (UTS), spheroidization and wire-diameter tolerance. Only with these can anyone judge fairly reliably whether a lot suits your screw spec and point-forming process — instead of drawing a conclusion from a single, deceptively precise number.

What Wire Runs Best on Drill Point Dies? A Fastener Wire Mechanical Properties Reference Table

The Question We Hear Most: "What Wire Runs Best on Your Dies?"

As a maker of drill point forming dies, the question we hear most from screw manufacturers is: "What kind of wire runs best on your dies?"

The table below — a Finished Wire Rod Mechanical Properties Inspection Standard — comes from wire mills. For common grades, it lists the acceptance ranges for hardness, tensile strength, decarburization and spheroidization before the wire enters cold heading and point (drill-tail) forming. We're putting it up front so you can bookmark it; the second half of this article looks at how to actually use it from a die maker's point of view.

Finished Wire Rod Mechanical Properties Inspection Standard (Original Table)

Grade	Hardness HRB (annealed)	Hardness HRB (non-annealed)	Tensile N/mm² (annealed)	Tensile N/mm² (non-annealed)	Decarburization (ferrite + transition layer, annealed)	Spheroidization (annealed)
1001T	50–75	55–85	300–500	350–550	≤ 0.20 mm or per customer	≥ 70% or per customer
X1006A, 1006A, 1008A, ML08, 1010A, 1015A	50–75	60–98	350–500	450–750	≤ 0.20 mm or per customer	≥ 70% or per customer
1018A, 1022A, 10B21	65–85	85–100	380–620	500–800	≤ 0.20 mm or per customer	≥ 80% or per customer
1035K, 35ACR, 40ACR, 1045K	75–90	85–120	460–600	540–1200	≤ 0.20 mm or per customer	≥ 80% or per customer
40Cr, SCM435	80–95	90–120	500–700	600–1200	≤ 0.20 mm or per customer	≥ 80% or per customer

Test equipment: hardness tester, tensile tester, metallographic microscope.

Using This Table From a Die Maker's Point of View

What we care about most is the annealed condition of the wire — its workability before it enters the forming machine. A few practical observations:

Too hard / high UTS: high forming resistance; the point may underfill or crack, and die life can drop or dies can chip.
Too soft: underfilled profiles and unstable dimensions.
It's not only hardness: spheroidization, lubrication, machine tonnage and speed, and die adjustment all shape the real result. Two lots inside the same acceptance band can still form differently when spheroidization differs — including on drill points and wide-flute ("big flash") points.
Shared responsibility: if the wire is clearly outside a reasonable range, a forming failure shouldn't be pinned entirely on the die; if the wire is in spec but forming is still unstable, the machine condition or die geometry is the more likely cause.

For the most common self-drilling screw wires — annealed 1022A or 10B21, medium-carbon / boron grades — you are usually in a "strong enough, still formable" middle band, a common choice for point forming. Softer low-carbon steels form easily but top out lower on strength; harder medium-carbon alloy steels (40Cr, SCM435) resist forming more and demand more from dies and machines.

A Note on This Table

To be clear: this table is inspection data provided by wire mills, and it gives an acceptance range, not the single optimum for your line. One honest point — as a die supplier, we likewise cannot hand you a "pick this grade, hit this hardness and nothing will go wrong" number. The final result of drill point (including wide-flute "big flash" point) forming is decided together by wire condition, spheroidization, lubrication, machine tonnage and speed, and die geometry and setup. What truly confirms suitability is first-article trials and batch performance.

So treat this table as a reference frame: it helps you narrow the range and argue from data during incoming inspection, wire-supplier discussions, and conversations with a die maker like us — not as a guarantee of results.

About ZLD Precision Mold

ZLD Precision Mold specializes in drill point forming dies — the tooling that shapes the drill point (including wide-flute points) that determines each self-drilling screw's geometry and performance. Our founder has 20+ years in cold-forging tooling, and over 7 years the company has served 30+ fastener manufacturers. Because the die sits in the middle of the wire → cold-heading → heat-treatment chain, we are used to discussing "wire condition" and "die selection" together.

If you are evaluating how a wire matches a screw spec and point forming, contact us with your wire data and screw drawing, or see our full die specifications. Standard items typically prototype in 3–4 days.