ASME B18.6.3 UNC Cross 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 UNC Cross 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.

When is the truss head worth the extra diameter?

When the joint material is the weak side of the pair. Comparing the collected ASME B18.6.3 tables at #10, the truss head spans 0.448 in maximum diameter against the pan head at 0.373 in — about twenty percent more bearing circle at a lower profile, 0.103 in maximum height. Over thin sheet, brittle plastics or elongated fixing holes, that extra bearing area is what stops pull-through; in machined bosses and thick fixtures it only adds a larger boss footprint. Match the truss head to the joints where the surface, not the screw, limits the clamp.

Truss head or washered pan head — how do they compare as bearing solutions?

Both spread load, but differently: a pan head plus a separate flat washer lets you size the bearing circle independently and add a hardened face, while the truss head builds the bearing into the part — no washer to stock, but the bearing diameter is fixed by the ASME B18.6.3 table (0.448 in maximum at #10, 0.573 in at 1/4). The truss form is the common answer in high-volume sheet assembly where a washer is one more feeding operation; the washered pan head is the answer where the bearing surface must be hardened or oversized beyond the standard truss envelope.

What is the MOQ and lead time for these cross recessed inch machine screws?

Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3-7 days; non-stock gauge sizes, lengths or finishes are quoted with a confirmed schedule. Confirm the exact schedule against quantity and size mix at quotation.

What should an RFQ for these cross recessed machine screws state?

State the standard designation (ASME B18.6.3), gauge size and threads per inch (for example #6-32, #10-24, 1/4-20 UNC), length, head style, drive (cross recessed / Phillips), material and grade (steel or stainless; state the stainless grade such as 18-8/A2 or 316/A4 if specified), finish, required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.