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Frequently Asked Questions
About Step Piercing Punches

Step piercing punches are press-tool punches with a smaller cutting point and one or more larger supporting sections. Vardhman's category includes Small Step Punch and Long Step Punch. Their subproduct pages list M2, M35 and M42 HSS, 50–100 mm and custom lengths, 64 ± 2 HRC, MOQ of 25 pieces and carton or customised packing.

Overview

Step piercing punches are press-tool punches with a smaller cutting point and one or more larger supporting or guiding sections. The stepped geometry can provide a cutting diameter, shoulder, guide land, relief or stronger shank. The exact function must be defined by the approved punch and die drawing.
The smaller active point enters the sheet and matching die opening, producing a pierced slug. The larger step normally supports or guides the point and should not contact the sheet or die unless specifically designed. During withdrawal, the stripper removes the sheet while the slug exits through the die.
A plain punch typically has a single working diameter that acts as both cutting point and shank. A step punch has two or more different diameters along its length, allowing a strong shank to drive a small or delicate point. This reduces unsupported length and bending risk.

Selection & Compatibility

A step punch should be used when piercing small holes in strong or thick sheet material, where a plain punch of the same point diameter would buckle, vibrate or break. The thicker step provides stiffness and guidance close to the cutting area, leaving only a short unsupported point length.
The page lists 0.2 mm to 50 mm, but a stepped punch requires at least two distinct diameters. Buyers must specify the point diameter and the shank diameter separately. The range should be checked against the exact point size and required shank size before assuming availability.
The live page lists HSS M2, M35 and M42. M2 provides practical toughness and wear resistance, while M35 and M42 add cobalt for higher hot hardness and abrasive wear resistance. Grade selection depends on point size, stripping force, sheet strength, speed, cooling and expected failure mode.
The point length must be long enough to pass through the stripper, penetrate the sheet, enter the die opening and provide a regrinding allowance. However, excessive point length reduces stiffness and increases the risk of bending and snapping. Point length must be balanced against available support and die thickness.
The page lists 50, 70, 80 and 100 mm plus custom lengths. These are overall lengths. The final drawing must also define the point length, the transition or step length, guided length and shank length, because overall length alone does not verify the punch's structural or functional design.
Clearance is defined per side between the punch point and the die opening. It should be selected based on sheet material, thickness, tensile strength, edge quality requirement and acceptable burr. Correct clearance is crucial for step punches to prevent high stripping drag from breaking the small point.
Tight clearance increases cutting load, friction, heat, secondary shear, stripping force, abrasive wear and slug jamming. High stripping friction can easily snap a slender point or pull the punch head from its retainer. The point diameter and die opening must be strictly controlled and aligned.
Excessive clearance can cause the sheet material to draw or roll into the die opening before fracturing. This creates rollover, heavy burr, dimensional variation and may cause the slug to pull back up with the punch. The required clearance balances hole quality against reliable stripping.
Slug pulling occurs when the punched slug sticks to the punch point and is drawn back out of the die. A pulled slug can jam between the strip and the punch step or stripper plate on the next stroke. Because step punches often have small points, the back pressure and impact will snap them immediately.
A step punch is often guided on its larger shank or step section through a close-fitting bushing in the stripper plate. This support reduces deflection, limits vibration and keeps the small cutting point aligned with the die opening. Guidance must not grip the step so tightly that the punch binds.
A double-step punch has a point, an intermediate step, and a main shank. This provides progressive stiffness for extremely small points or accommodates special stripper and retainer layouts. The drawing must specify three diameters, two transition radii and three lengths.
Yes. An angled, concave or rooftop shear profile can be ground into the face to spread the cutting load over a longer stroke and reduce peak tonnage. However, shear on a small-diameter point can cause side loading, slug distortion and difficult regrinding. The shear profile must be defined and balanced.
Replace the punch when the point is bent, cracked, heavily galled, chipped beyond the regrind limit, below minimum usable point length, or outside dimensional tolerance. A bent point cannot be reliably straightened and will quickly break or damage the die opening.

Material & Maintenance

Provide point diameter, point length, transition radius, shank diameter, guided length, head or retainer style, overall length, relief, face geometry, HSS grade, hardness, coating, tolerance, sheet material, thickness, quantity and matching die details. The step radii are critical and must be shown.
The step where the smaller point meets the larger shank creates a severe stress concentration. If the internal corner is perfectly sharp or contains grinding marks, the punch will fracture quickly under cutting or stripping loads. A generous, polished blend radius distributes the stress and prevents failure.
The live page states 64 ± 2 HRC, which provides high wear resistance for the point. However, the shank and head may require a softer, tougher condition (annealed or tempered back) to resist impact and retention shock without shattering. We must confirm the required hardness profile and heat-treatment method.
The live Carbide Punches page lists HSS M2, M42 and M35 and 64 ± 2 HRC, which conflicts with its product name. For a carbide stepped punch, buyers must request the actual carbide grade, binder, hardness scale, toughness, transition-radius finish and intended application, as carbide is brittle and sensitive to transition stress.
A smooth, longitudinally polished finish on the point and transition radius significantly reduces stripping friction, heat, galling and stress concentration. The page lists 0.3 to 0.04 micron, but the drawing must specify the required parameter (e.g. Ra) and orientation for the point, transition and guided shank separately.
Yes. A suitable coating (like TiN, TiCN or TiAlN) provides high surface hardness and low friction, which reduces galling and abrasive wear on the small point and lowers stripping load. The coating must be compatible with the HSS base, heat treatment, sheet material and die clearance.
The point, transition radius, guided step, shank and head must all share the exact same axis. If they do not, the point will enter the die off-centre, causing uneven clearance, hole marking, severe side loading, accelerated wear and rapid point breakage. Concentricity must be strictly toleranced and inspected.
Bending occurs when the point length is too long, guidance is inadequate, the press is misaligned, stripping is off-centre, or the cutting load exceeds the column strength of the point. Shortening the point length, improving the guide-bushing tolerance, or using a stronger grade can reduce buckling risk.
Breakage at the transition is typically caused by a sharp internal corner, grinding marks acting as stress risers, lateral deflection, stripping friction, misalignment, or brittle heat treatment. Ensure a generous, polished blend radius is machined between the point and the larger step.
Point chipping results from tight or uneven die clearance, breakthrough impact, side deflection, hard inclusions in the sheet material, abusive regrinding, or an overly brittle material condition. Examine the fracture, die alignment and clearance before selecting a tougher HSS grade.
Galling is the adhesive transfer of work material to the point. It is driven by friction, heat, poor lubrication, rough point finish, tight clearance, and soft or sticky sheet materials like aluminium or copper. Galling buildup changes hole size and massively increases stripping drag, leading to point breakage.
A suitable stamping lubricant reduces cutting friction, dissipates heat, prevents galling and lowers stripping force—all vital for protecting a small point from snapping. However, excessive or heavy lubricant may worsen slug-pulling. The lubricant must match the work material, coating and die process.
Sharpen when edge rounding becomes measurable, burr height increases, hole quality declines, or press tonnage rises. Do not wait until the point chips deeply or fails. Regular, light regrinding removes micro-cracks, restores the clean cutting action, and maintains die clearance.
Use a rigid precision setup referenced to the shank or guided step. Remove material uniformly from the cutting face with light passes and copious coolant to avoid overheating and softening the point. Ensure the face remains square, or accurately recreate any original shear profile. Record the remaining point length.

Transactional

Yes. The page states custom lengths and sizes are available. You must provide a dimensioned drawing detailing point diameter, point length, transition radius, shank or step diameter, guided length, head or retainer style, overall length, material, hardness, coating, tolerances, and sheet material.
Depending on criticality, request material grade confirmation, heat-treatment and hardness reports (for point and head), coating certificates, dimensional inspection reports (especially for concentricity and transition radius), surface-finish reports, and batch traceability. Agree on the inspection method before manufacture.
Pricing depends on point diameter, step geometry, transition complexity, head style, lengths, HSS or carbide grade, heat treatment, precision step grinding, concentricity requirements, coating, order quantity, and destination. A dimensioned drawing is required for an accurate custom quote.
The category page does not display one specific MOQ, but multiple child pages state an MOQ of 25 pieces. Because these pages share template specifications, confirm the MOQ, stock availability, and batch pricing for the exact point diameter, grade, lengths, and coating required before ordering.
The page states carton packaging or packaging according to client requirements. Step punches feature fragile points and precision shanks; they must be individually sleeved, coated with rust-preventative oil, and boxed securely to prevent bending, impact, corrosion, and size mixing.
The page indicates standard items are maintained in stock. However, because step punches require specific point diameter-to-shank combinations and transition lengths tailored to particular dies, they are often manufactured to order. Request current stock and lead time against your exact drawing.
Vardhman Dies & Mould Tools operates from the Bhayandar/Mumbai region in Maharashtra, supplying piercing components to Indian press shops and positioning them for worldwide export. Send your dimensioned drawing, quantity, and destination for a quotation and delivery terms.
Use the website enquiry form and attach your dimensioned drawing. Specify the point diameter, point length, transition radius, shank diameter, guided length, head style, overall length, HSS grade, hardness, coating, sheet material, quantity, and delivery destination. Review the technical offer before approving production.

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