Snow Racing Tire Anti-Skid Studs

A turned steel stud for studded snow and ice-racing tires: a machined cone stands proud of the tread, a hex body is the drive, and a short machine thread holds the stud in the tread block. Length, cone angle and thread are quoted from your drawing.

What This Stud Does in the Tread

The cone concentrates the contact load onto a small steel point where rubber alone would slip on ice. Everything else on the part exists to keep that point in place: the hex body takes the installation torque, the flange face stops the stud at the right depth, and the thread resists pull-out under cornering and braking.

Item 1555: hex body, straight cone, short machine thread, matt black electrophoresis finish.

Where This Stud Is Used

Studded winter and ice-racing tires are the application, and the assembly is always the same: the stud sits in a tread block, either in a moulded hole or a threaded insert, and stands proud of the rubber by the protrusion p.

Studded winter and ice-racing tires

The stud is driven into the tread block and stops on its face, so protrusion p repeats across the set. In competition the failures that matter are a stud that walks or is pulled out under cornering, a block torn around the hole, and protrusion that changes between laps as points wear. We hold cone height, face squareness and runout between tip and thread, and gauge the thread after coating so the stud seats in a pre-threaded insert without rework.

Studded winter tires: the studs stand proud of the tread and repeat the same protrusion across the set.

The Cone Tip Sets the Contact Pressure

Grip is contact pressure – stud load divided by the area of the point that actually touches the ice – so the included angle and the tip radius decide grip long before the thread is considered. A narrow cone puts more pressure on a smaller patch, which bites into ice and also wears the point flat on dry tarmac.

Three dimensions travel together: the included angle a, the cone height h and the tip radius at the very end. Opening the angle spreads load and slows wear; closing it sharpens grip and speeds up point loss. The tip radius is the dimension buyers most often leave open, and it decides whether the point survives transport and studding.

Dimension codes: a = included tip angle, h = cone height, s = hex across flats, d = thread diameter, L = overall length, b = thread length.

Concentricity is the other half of the same problem. If the cone axis and the thread axis are not on one line, the point leans: the stud walks in its hole, the tread block is loaded on one side, and protrusion changes from lap to lap. On a turned part this is a setup question, and the measurable result is total indicator runout between tip and thread, checked between centres or on a projector.

Hex Body and Face: Drive and Depth Stop

With no slot and no recess, the hex body is the only drive: the across-flats dimension s picks the socket and the body height decides how much torque the corners survive before they round over. Studding runs at volume with a powered socket, so a rounded body is a rejected part.

The face under the body is the depth stop. It seats on the tread block and sets the protrusion p; if it is not square to the thread, the stud tilts and one side of the cone takes the load. Squareness is checked as a face-to-thread relationship, not as a cosmetic feature.

• Across flats s – matches the studding socket; a non-standard s needs its own tool.
• Body height – corner area for torque; short bodies round off before the stud seats.
• Face squareness – sets protrusion repeatability across a batch.
• Face diameter – bearing area on the rubber; too small and the block creeps around the stud.

Thread Length and Seating Depth

The thread only works when the engaged length matches the tread: b has to cover the tread block plus any insert, and the stud must not bottom out before the face seats. Too long and the face never reaches the rubber; too short and the stud sits on a few turns.

For a blind insert, usable thread depth is checked against b at drawing review, and the last thread is kept clear of the hole bottom so the face can land. Protrusion p then repeats from part to part without adjustment on the studding bench.

Why Electrophoresis Black

The finish is part of the function here: an immersion coating builds evenly on the cone flanks and into the hex corners, including the recesses that spray painting misses, and keeps the stud dark against the tread. Film build is controlled so the thread still passes go/no-go after coating.

Coating and gauging are agreed together. A thread that passes before plating and fails after it is a plating problem, not a thread problem, and it shows up as a stud that will not seat in a pre-threaded insert.

Turning Route: Cone, Hex and Thread from Bar

The part is turned from bar, so cone angle, body height and thread length are set independently instead of being tied to a heading die. That is what allows a non-standard cone angle without new heading tooling.

Turning route for the stud: cone, hex body, thread and coating are separate operations on the same part.

Inside the Plant

MANUFACTURING

Heading, turning and finishing under one roof

Bar in, gauged studs out: one team owns the turned geometry and the coating batch.

Heading floor at Shi Shi Tong — single-die machines and multi-station headers on one floor

Multi-station cold heading for high-volume runs

Cold heading area overview

What We Measure on a Tire Stud

Inspection covers the dimensions that decide grip and retention: tip geometry, hex across flats, face squareness, thread gauge and coating thickness.

INSPECTION

Tip, hex, thread and coating measured per batch

Every dimension below is recorded against the drawing.

Thread gauging with GO/NO-GO gauges

Thread profile and dimensions on an optical projector

Hardness testing on a Rockwell hardness tester

In-house salt-spray testing for selected finishes

• Tip angle and tip radius – checked on an optical projector against the drawing angle a.
• Runout between tip and thread – measured between centres; predicts a walking stud.
• Hex across flats s and body height – calliper and micrometer, corners checked visually.
• Thread – go/no-go gauges before and after coating.
• Coating – film thickness on cone and body, plus in-house salt spray on plated batches.
• Hardness – where the drawing specifies a hardened stud, checked on a Rockwell tester.

Documents and Certificates

Paperwork is issued per batch so the pack matches the studs in the box: material certification for the bar lot, inspection records for the dimensions above, and the coating record.

CERTIFICATES

Quality and compliance documents

Click any certificate to open the full-size document.

ISO 9001	RoHS
Registered trademark	Patent

Frequently Asked Questions

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Guides on hex drives and thread sizes

GUIDE Hex Head Screws: Uses, Types and Customization Read the guide →

GUIDE M4 Screws: Size, Specifications and Custom Solutions Read the guide →

CUSTOMERS

Buyers who visit the plant before they place the order

Programmes start with a drawing review and a plant visit, not with a catalogue page.

Drawing review with a visiting buyer	Sample review on the bench	Production walk-through
Packing and dispatch review	Repeat customer from Denmark	Meeting buyers at the exhibition

Send Your Stud Drawing