At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of ISO 7051. Cross-recessed raised countersunk (oval) head tapping screws, Form C, ISO 1478 thread. The countersunk portion (dk, k) matches ISO 7050; a raised dome of height f sits above the flat. Sizes ST2.2 to ST6.3.
Cross-recessed raised countersunk (oval) head tapping screws, Form C, ISO 1478 thread. The countersunk portion (dk, k) matches ISO 7050; a raised dome of height f sits above the flat. Sizes ST2.2 to ST6.3.
Raised countersunk (oval) head tapping screw
Key dimensions for common sizes are listed below.
| Nominal size ST | Pitch P (mm) | Head dia dk max (mm) | Head height k (mm) | Raised height f (mm) | Cross recess no. |
|---|---|---|---|---|---|
| ST2.2 | 0.8 | 4.3 | 1.3 | 0.5 | No.1 |
| ST2.9 | 1.1 | 5.5 | 1.7 | 0.7 | No.1 |
| ST3.5 | 1.3 | 6.8 | 2.1 | 0.8 | No.2 |
| ST3.9 | 1.3 | 7.5 | 2.3 | 0.9 | No.2 |
| ST4.2 | 1.4 | 8.1 | 2.5 | 1.0 | No.2 |
| ST4.8 | 1.6 | 9.5 | 3.0 | 1.2 | No.2 |
| ST5.5 | 1.8 | 10.8 | 3.4 | 1.3 | No.3 |
| ST6.3 | 1.8 | 12.4 | 3.8 | 1.6 | No.3 |
Tapping-screw thread per ISO 1478 (ST series)
[‘ISO 7050’, ‘ISO 7047’, ‘ISO 1478’, ‘DIN 7983’]
For the official ISO standards catalogue, see the ISO standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We produce ISO 7051 fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Cross-recessed raised countersunk (oval) head tapping screws, Form C, ISO 1478 thread. The countersunk portion (dk, k) matches ISO 7050; a raised dome of height f sits above the flat. Sizes ST2.2 to ST6.3.
Ananka Fasteners manufactures ISO 7051 in sizes from ST2.2–ST6.3. See the Dimensional Table above for the complete size breakdown.
Tapping-screw thread per ISO 1478 (ST series)
We produce ISO 7051 fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
Yes. For a quotation, provide the required nominal size, material grade, quantity and any inspection or certificate requirements.
Need a fastener manufactured to ISO 7051 for an industrial project? Send the required fastener type, size, material grade, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ISO 7051 requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per ISO 7051 and industry references; provided for reference only — confirm against the current edition of the standard before design use.
