Countersunk Head Cross Recessed Self Tapping Screws DIN 7982 C Type
Product Summary
DIN 7982 / ISO 7050 C type countersunk head cross recessed self tapping screws in 1022A carbon steel or 304 / 316 / 410 stainless, ST2.2-ST6.3 (#2-#14), sitting flush in sheet metal, enclosures and metal frames.
Basic Properties
country of origin
China
Brand Name
FLRS or OEM
certificate
ISO 9001:2015
PRODUCT MODEL
DIN7982-CTYPE-ST2.2-ST6.3
Trading Properties
MOQ
1000 Pieces
unit price
USD 8.5-18.0 / Thousand Pieces
payment method
T/T,L/C,Western Union,PayPal
Supply Capacity
300 Tons per Month
Product Custom Attributes
Highlight
DIN 7982 Countersunk Flush Seating
,H Type Phillips Cross Recess
,1022A Carbon Steel 304 410 Grades
Standard:
DIN 7982 / ISO 7050, C Type
Head Type:
Countersunk Head, 80 Degree To DIN 7982 (successor ISO 7050: 90 Degree), Flush Seating
Drive Type:
Cross Recessed Phillips, H Form To ISO 4757
Thread Type:
C Type Coarse (spaced) Self Tapping Thread, ISO 1478
Size Range:
ST2.2-ST6.3 Metric / #2-#14 Gauge
Material Grades:
1022A Carbon Steel, 304 (A2), 316 (A4), 410
Point Type:
C Type Pointed, Pre-drilled Pilot Hole
Hardness:
Carbon Steel: Case-hardened, Surface ≥450 HV0.3, Core 270–390 HV Per ISO 2702 / 410 HRC 30-36 / 304 And 316 HV 180-220
Surface Finish:
Clear Or Yellow Zinc Plated, Plain, Passivated
Salt Spray:
48-96 Hours Neutral Salt Spray For Zinc Plated Carbon Steel
Application:
Sheet Metal Fabrication, Electrical Enclosures, Automotive Body Panels, Metal Door And Window Frames
OEM Service:
Custom Length, Partial Thread, Washer Assembly, Customer Label
Product Description
Detailed Specifications & Features
Countersunk Head Cross Recessed Self Tapping Screws — DIN 7982 / ISO 7050, C Type
A flat countersunk self tapping screw engineered for thin sheet metal. The 80° countersunk head seats fully into a matching countersink, so the head finishes flush with the workpiece surface — no protrusion, no snagging, no secondary machining. The C type coarse (spaced) thread cuts its own mating thread in pre-drilled pilot holes in mild steel sheet, aluminium, and thin-wall profiles.
What Makes This Specification Different
- True flush seating. 80° countersunk head angle with a controlled head-to-shank , so the head sits flat in punched or drilled countersinks instead of rocking.
- DIN 7982 / ISO 7050 C type geometry. Not a raised-countersunk (DIN 7973) or a square-drive flat head — this is the metric C type coarse-thread form with a full ST2.2–ST6.3 range, widely specified on European sheet metal drawings.
- H type cross recess. cross recessed H form to ISO 4757, recess size H1 for ST2.2–ST2.9, H2 for ST3.5–ST4.8, H3 for ST5.5–ST6.3; recess depth m varies by size per DIN 7982.
- Four material routes in one part number family. Cold heading grade 1022A carbon steel for high-volume assembly, plus 304, 316 and 410 stainless for corrosion or magnetic-response requirements.
Size Range & Thread Mapping (C Type Coarse Thread, ISO 1478)
| Metric Size | Equivalent Gauge | Pilot Hole (mild steel) | Head diameter dk max, DIN 7982 | Typical Length Range |
|---|---|---|---|---|
| ST2.2 | #2 | 1.7–1.9 mm | 4.3 mm | 4–10 mm |
| ST2.9 | #4 | 2.2–2.5 mm | 5.5 mm | 6–16 mm |
| ST3.5 | #6 | 2.6–3.1 mm | 6.8 mm | 8–25 mm |
| ST3.9 | #7 | 2.9–3.5 mm | 7.5 mm | 10–30 mm |
| ST4.2 | #8 | 3.1–3.7 mm | 8.1 mm | 10–40 mm |
| ST4.8 | #10 | 3.6–4.3 mm | 9.5 mm | 12–50 mm |
| ST5.5 | #12 | 4.2–5.0 mm | 10.8 mm | 16–60 mm |
| ST6.3 | #14 | 4.9–5.8 mm | 12.4 mm | 20–70 mm |
Material & Finish Options
| Option | Base Material | Hardness | Corrosion / Notes |
|---|---|---|---|
| Carbon | Case-hardened 1022A carbon steel | surface hardness ≥ 450 HV0.3 | core 270–390 HV, per ISO 2702 / GB/T 3098.5 |
| 304 | Stainless steel A2 (1.4301) | HV 180–220 | General indoor / outdoor corrosion resistance, essentially non-magnetic in the annealed condition; cold heading and thread rolling may induce slight magnetism |
| 316 | Stainless steel A4 (1.4401) | HV 180–220 | Marine / chloride and chemical environments |
| 410 | Stainless steel 410 (1.4006) | HRC 30–36 | Hardened martensitic grade for abrasive or repeated-run driving, magnetic |
Where It Is Used
- Sheet metal fabrication: flush assembly of 0.5–2.0 mm cold rolled and galvanised panels.
- Electrical enclosures and control cabinets: flat internal faces so cable trays and gaskets sit without interference.
- Automotive body panels and interior brackets: blind-side flush fastening where trim must sit tight.
- Metal door and window frames: profile-to-profile joints with no raised head to catch on weather seals.
Quality Control
- Thread form and pitch checked to ISO 1478
- Head recess depth and cross slot angle verified to ISO 4757 H form
- Hydrogen embrittlement relief baking for hardened carbon steel, when required
- Torque-to-failure and drive test sampling per lot
Ordering Information
Quote by size, length, material grade, finish and packing format. Non-standard lengths, partial thread, sealing washers or captive washer assemblies are available against drawing or sample. Send the sheet thickness and target torque and we will confirm the pilot hole and size combination.
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