PRODUCT DATA SHEET · Inch Machine Screw
Inch Machine Screw — Flat Countersunk Head
A2 (STS304Cu) · Pickled
Inch Machine Screw
Custom SpecificationAvailable
Length AdjustmentAvailable
MOQ applies · Enquire
Representative item: SFMASB063-0190
| Manufacturing Basis | JK Standard (ref. ASME B18.6.3) |
|---|---|
| Head Type | Flat Countersunk Head |
| Material | A2 (STS304Cu) |
| Property Class | A2-50 |
| Finish | Pickled |
| Size Range | 1/4-20 ~ 1/4-20 |
| Items Listed | 7 |
Mechanical Properties (KS B 0233 · ISO 3506-1)
| Min. Tensile Strength | 500 min. N/mm² |
|---|---|
| 0.2% Proof Stress | 210 min. N/mm² |
| Notes | Soft (not work hardened) austenitic |
3D and 2D data based on actual production parts for every item. In-house inspection per lot; test certificates (material, product inspection, tensile, hardness, etc.) available.
Standard Industrial Stock Item — JK Standard refers to the in-house manufacturing standard of Jungkum Fastener Industrial Co., Ltd. This item is produced and controlled under that standard, which references the relevant public standards. Applications requiring full KS-standard compliance (e.g. defense, nuclear power) are handled on a dedicated production line — please contact us.
Dimensions Unit: mm — from production drawings
| Nominal Diameter | Head Dia. D | Head Height H |
|---|---|---|
| 1/4-20 | 12 | 3.4 |
※ Representative dimensions; tolerances are per the drawing. Detailed tolerances are provided with a quotation or drawing request.
Size Matrix Nominal diameter × length (inch) — click a cell to open that item
※ Values in this document are for reference only and are not guaranteed. Verification under actual service conditions is recommended.
※ This series is manufactured and controlled under our in-house standards, which reference the relevant public standards. Applications requiring full KS-standard compliance (e.g. defense, nuclear power) are handled on a dedicated line.
※ Sizes not listed can also be discussed — call +82-32-821-4910
JUNGKUM FASTENER INDUSTRIAL CO., LTD. · 37 Eunbong-ro, Namdong-gu, Incheon, Korea · www.jungkum.com · Printed
