Stainless Steel Round Head Cross Step Screws

Product introduction

Round head cross step screws are non-standard screws and special-shaped screws, supporting the development of various non-standard customized screws. The product adopts an integrated step structure, which relies on the steps to achieve precise limit positioning, eliminating the need for additional washers and simplifying the assembly process. Relying on cold heading and precision CNC machining technology, the thread precision is high and the step size tolerance is controllable. Parameters such as head diameter, step height, rod diameter, thread length, etc. can be flexibly adjusted according to customer drawings and samples to get rid of the size restrictions of standard fasteners. Widely used in electromechanical accessories, smart homes, auto parts, instruments and equipment, etc. The manufacturer supports one-stop proofing and mass production, and continues to provide stable and durable non-standard customized screw solutions to global buyers.

 

The round head cross step screw is a typical screw with a special shape. Its structural characteristics are: the round head is driven by a cross groove, and the rod is equipped with one or more precise positioning steps. The step structure can realize the limiting, supporting or bearing functions of the connected parts to avoid excessive locking and damage to the workpiece.

 

As a non-standard screw, the key breakthrough of this product is:

Step geometric parameters: step diameter, height, and position can be designed as needed

Cross drive slot: compatible with standard Phillips screwdrivers for easy assembly operations

Bottom surface of round head: flower teeth or washer surface can be added to achieve anti-loosening function

Compared with ordinary round head screws, this product is developed for precise positioning and limit assembly conditions. It is a high-frequency demand category in the field of non-standard custom screws.

 

Materials and application fields

Carbon steel (grade 4.8/8.8), high strength, controllable cost, mechanical equipment, home appliance assembly

Stainless steel (304/316), corrosion-resistant, smooth and beautiful, medical equipment, electronic instruments, outdoor equipment

Alloy steel (40Cr), wear resistance, impact resistance, auto parts, sports equipment

Core application scenarios (extensive use of non-standard custom screws):

Electronic communication: PCB board positioning, heat dissipation module limit, step control assembly gap

Automobile manufacturing: The chassis and body are fixed, and the steps can be embedded in the bearing holes for positioning.

Precision instruments: precision assembly of instruments and digital products

Welding assembly: The steps are embedded into the workpiece and then welded to prevent deflection and thread burn.

When standard screws cannot meet the positioning or limiting requirements, only non-standard customized screws can solve the problem.

 

Quality control and certification system

Full inspection of geometric dimensions:

The outer diameter of the step, the height of the step, and the coaxiality of the step are 100% inspected by an image screening machine, with a tolerance of ±0.05mm.

The outer diameter of the round head and the depth of the cross groove should be CPK ≥ 1.33, and the threads should be confirmed with a grade 2 thread gauge.

Mechanical property testing:

Breaking torque test (verify whether the cross groove is slippery or broken)

Locking torque test (simulating the limiting effect of steps in actual working conditions)

Material and surface:

Spectral component analysis + hardness testing

Salt spray test (up to more than 200 hours depending on coating requirements)

Certification system:

ISO 9001:2015

IATF 16949 (automotive industry applications)

RoHS/REACH (export compliance)

All non-standard customized screws are provided with first article inspection report and material certificate.

 

Customized services (focus on non-standard customization)

We focus on the R&D and mass production of non-standard custom screws. We can provide the following customization directions for round head cross step screws:

Step parameters are non-standard:

Single step, double step or multiple steps

The shape of the steps can be right-angled steps, tapered steps or arc transitions

The step position can be under the head, in the middle of the pole or at the tail

Round head and drive slot are non-standard:

The round head can be changed to small round head, thin head, flange and other special shape screws

The cross groove can be changed to H type, Z type or composite groove

Non-standard threads and stems:

Full thread, half thread, partially threadless

The stem can be knurled, flattened or perforated

Non-standard surface treatment:

Zinc plating, nickel plating, Dacromet, passivation, blackening

Customers provide 2D/3D drawings, samples or assembly descriptions. We provide full-process services from cold heading mold development, sample trial production (≤500 pieces) to mass production.

 

FAQ

Q: What are step screws? What is the difference from ordinary screws?

A: The step screw is equipped with one or more step structures on the rod part, which can accurately position, limit or support the connected part-1. This is typical of specially shaped screws, whereas regular screws have only a single threaded shank. The step design is particularly suitable for precision assembly scenarios that require non-standard customized screws.

 

Q: Can round head cross step screws be used in self-tapping scenarios?

A: Yes. The self-tapping function can be realized by designing the thread to be self-tapping and changing the tail to a pointed tail structure. We can design special non-standard customized screw solutions based on the base material (plastic, aluminum alloy, sheet).

 

Q: Will the steps affect the strength of the screws?

A: Rational design does not. When designing non-standard screws, we will reserve step transition fillets to avoid stress concentration. Using grade 8.8 or above materials and appropriate heat treatment can meet high strength requirements.

 

Q: What is the minimum order quantity? Can I make a sample?

A: The minimum quantity for the sample stage is 200-500 pieces for assembly verification; the minimum order quantity is 5,000 pieces. Since the step structure requires special mold opening, it is a typical non-standard customized screw delivery process.

 

Q: Can round head cross step screws be used for welding?

A: Absolutely. The steps can be embedded in the workpiece hole for positioning to prevent nut deflection and thread burn during welding. This is a common application of specially shaped screws in welded assemblies.

 

Q: Can we produce anti-loosening screws with teeth or slots on the end of the step?

A: Yes. We can add teeth or radial ribs to the bottom of the step, which is a functional integration of non-standard screws. Please advise your anti-loosening grade requirements.

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