ASME B18.6.3 Combination Slotted & Square Recessed Truss 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 Truss 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.

Truss head or pan head — how do I choose between the two domes?

Compare the collected tables at the same gauge: #10 measures 0.448 in across by 0.128 in high as a truss head against 0.373 by 0.137 in as a pan head. The truss trades head height for bearing circle — the wide, shallow dome spreads load on thin sheet, plastics and gasketed joints where a pan head would dig or pull through. Where the joint is solid and clearance is tight, the taller narrower pan head is the ordinary choice. Both heads on these two pages carry the same combination drive, so the head decision is purely about the joint surface.

Can this truss head replace a slotted truss head in an existing assembly?

The head envelope matches the slotted truss line, but the combination recess changes one dimension the seating sees: minimum slot depth runs about 10% below the slotted head because the square recess takes up head material (stated in the collected table notes). If the existing assembly relies on the slot as its only drive, the shallower slot still serves a flat blade for low-torque service; confirm the drive tooling used on the line and state both drives when ordering if field serviceability matters.

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.