Pan Head Self Tapping Screws
| Standard | DIN 7981 · ISO 7049 |
|---|---|
| Material | C1022 Case Hardened Steel |
| Strength Grade | Case Hardened |
| Size Range | ST2.2-ST6.3 |
| Surface Treatment | Zinc Plated |
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Product Description
Product Description & Key Specifications
Pan head self tapping screws form or cut their own mating thread in suitable sheet metal or prepared pilot holes. They are used in automotive trim, equipment covers, light brackets, panels and housings where a separate nut or tapped insert is not required.
This range is supplied in C1022 case hardened steel to DIN 7981 / ISO 7049 with ST2.2-ST6.3 sizes and zinc plated finish. Case hardening gives the screw surface the hardness needed for thread forming in sheet metal while maintaining useful core toughness.
Self tapping screw selection should confirm screw size, length, point form, pilot hole size, sheet thickness, installation torque, coating and head/drive style. They are different from self drilling screws, which include a drill point for drilling into metal.
| Product type | Pan head self tapping screws / sheet metal screws |
|---|---|
| Standards | DIN 7981 / ISO 7049 |
| Material | C1022 case hardened steel |
| Strength grade | Case hardened |
| Size range | ST2.2-ST6.3 |
| Common models | ST2.9 x 9.5, ST3.5 x 13, ST4.2 x 16, ST4.8 x 19, ST5.5 x 25, ST6.3 x 32 |
| Drive and head | Pan head, cross recess or drawing-based drive |
| Surface finish | Zinc plated |
| Matched hardware | Sheet metal panels, light brackets, covers and prepared pilot holes |
| Documentation | CoC, material certificate, hardness, dimensional and coating report on request |
Dimensions & SpecificationsDIN 7981 / ISO 7049
Technical Drawing
Dimensional Table
| Parameter | ST2.2 | ST2.9 | ST3.5 | ST3.9 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | 95 | 98 |
|---|---|---|---|---|---|---|---|---|---|---|
| P | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.6 | 1.8 | 1.8 | 2.1 |
| a/max | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | — | — |
| dk/max | 4.2 | 5.6 | 6.9 | 7.5 | 8.2 | 9.5 | 10.8 | 12.5 | — | — |
| dk/min | 3.9 | 5.3 | 6.54 | 7.14 | 7.84 | 9.14 | 10.37 | 12.07 | — | — |
| k/max | 1.8 | 2.2 | 2.6 | 2.8 | 3.05 | 3.55 | 3.95 | 4.55 | — | — |
| k/min | 1.55 | 1.95 | 2.35 | 2.55 | 2.75 | 3.25 | 3.65 | 4.25 | — | — |
| r/max | 0.3 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | — | — |
| No. | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | — | — |
| M | 2.6 | 3 | 4.2 | 4.4 | 4.6 | 5 | 6.5 | 7.1 | — | — |
| t/min | 0.86 | 1.35 | 1.4 | 1.63 | 1.8 | 2.26 | 2.49 | 3 | — | — |
| t/max | 1.32 | 1.8 | 2.03 | 2.26 | 2.46 | 2.87 | 3.15 | 3.66 | — | — |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Automotive Trim and Interior Panels
ST3.5-ST4.8 zinc plated self tapping screws are used for trim, brackets and covers where the screw forms threads in sheet metal or plastic-metal panel interfaces.
Automotive and EV fastenersEquipment Covers and Light Brackets
Pan head self tapping screws support covers, guards, housings and light brackets where a separate nut or insert is unnecessary.
Industrial equipment fastenersService and Maintenance Hardware
Self tapping screws are common in repair kits and panel replacements when pilot hole size and sheet thickness are controlled.
Railway fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cold heading and self tapping thread rollingC1022 material and wire diameter verification
Case hardening for thread forming performanceSurface hardness, core hardness and case depth checks when specified
Pan head and drive forming to DIN / ISO referenceHead dimensions, recess fit, point form and thread profile inspection
Zinc plating for general corrosion protectionCoating thickness and visual inspection
Carton, bulk or assembly-line packagingCoC, hardness and dimensional reports prepared on request
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FAQ
Common Questions Before RFQ
What is the difference between self tapping and self drilling screws?
Self tapping screws form threads in a prepared hole. Self drilling screws include a drill point that drills the hole before threading.
Do these screws need a pilot hole?
Most self tapping applications use a pilot hole sized according to screw size, sheet thickness and material.
Why is C1022 case hardened steel used?
Case hardening provides surface hardness for thread forming while keeping the core tougher for installation.
What finish is available?
Zinc plated finish is available for general corrosion protection.
What RFQ details are needed?
Send ST size, length, point type, drive, finish, sheet thickness, pilot hole and quantity.
Need DIN 7981 / ISO 7049 pan head self tapping screws?
Send ST size, length, drive, point form, sheet thickness, coating and quantity. We can quote zinc plated C1022 case hardened self tapping screws for automotive and equipment panels.
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