ASME B18.6.3 Micro Machine Screws (Cross-Recess and Slotted)

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

• The fastener family (ASME B18.6.3 Micro Machine Screws (Cross-Recess and Slotted)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
• Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
• Quantity per size and your target delivery date.
• Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

Cross-recess Type I, II, III or VI — does it really matter which one a micro screw carries?

It matters more than at any other size range. The collected table dimensions each type's recess separately per size — recess diameter, driver size and the penetration gaging depth P — because at #0 to #2 scale, a driver that does not seat fully either cams out (Type I/II Phillips behavior) or bottoms and bulges the head. The P max/min pairs are the gaging depths an inspector checks: too shallow and the driver rides out under torque; too deep and the driver bottoms, spinning without driving. The types are also not interchangeable in tooling: Type III is a square-drive recess, Type VI takes TORX-compatible drivers (T5 at #1 up to T60 at 3/4" as tabulated). The practical rule for micro assembly: name the type and the driver on the RFQ together, and qualify the pairing once — the table tells you they are different geometries, and production tells you what happens when a line assumes otherwise.

Why do some cells show "..." or bracketed notes instead of numbers?

Because the micro table is a fork, not a full grid: not every recess type is offered at every size, and the source marks those cells with spaced placeholder dots ("...", ". ..") — carried verbatim below, not read as zeros. In the slotted-head table, the F and G columns print "[Note (4)]" below #0: the dimension is covered by the standard's note 4 rather than tabulated — meaning the smallest heads are inspected by rule, not by that gaging figure. Both markings are the source's own, and both change how the table reads: a "..." cell is a configuration that does not exist at that size (order a different type), while a [Note (4)] cell is a configuration that exists with a different acceptance method. The rendered table flags these so no one downstream reads a blank as missing data and "fills it in" — the classic micro-screw inspection error.