ASME B18.6.3 Combination Slotted & Square Recessed Pan Head Machine Screws

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 Combination Slotted & Square Recessed Pan Head Machine Screws) 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.

Why specify a combination drive instead of a plain square recess?

Serviceability. The square recess handles powered production driving with no cam-out, while the slot keeps the screw serviceable with any flat blade in the field — no driver bit inventory for a technician opening an enclosure years later. The costs are on the collected table: the recess plus slot combination underfills the head, cutting minimum slot depth about 10% versus a plain slotted pan head, so the slot is a service feature rather than a high-torque drive. If the assembly is only ever driven by controlled tooling, the pure square recessed pan head gives the same envelope without that compromise.

Is the head envelope the same as the pure square recessed pan head?

Yes — comparing the collected tables, #4 through 5/16 carry identical head diameter and height values (0.373 by 0.137 in at #10, for instance) across both pages, so the two variants swap into the same seating envelope. What differs is the drive tooling and the wider size span of this combination line, which reaches #3 through 3/8. Confirm thread series and length at quotation since the collected tables tabulate by basic screw diameter.

What is the MOQ and lead time for these square recess machine screws?

Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock sizes, lengths or finishes are quoted with a confirmed schedule. Common sizes in this designation are widely stocked — confirm the exact schedule against quantity and size mix at quotation.

What should an RFQ for these square recess machine screws state?

State the standard designation (ASME B18.6.3 — often still called ANSI B18.6.3) and drive type (square recessed; combination slotted + square recessed where both drives are wanted), nominal screw size and thread series with threads per inch, length and head style, material and grade (steel or stainless; state the stainless grade such as 18-8/A2 or 316/A4 if specified), finish (plain, zinc plated, or other), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.