ANSI B18.3 Hex Socket Set Screws, Cup Point

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 (ANSI B18.3 Hex Socket Set Screws, Cup Point) 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.

What does the cup diameter d z actually control, and why does it have tolerance limits?

The cup is not a flat dimple — it is a circular cutting edge of diameter d z, and the edge is what bites the shaft. The max/min limits (at 1/2 in: 0.291/0.270 in) keep that edge inside a band where it is sharp enough to dig and broad enough not to wash out the shaft wall. A cup near max spreads the holding force over a wider ring and marks less but grips more gently; near min it concentrates the bite. Practically, d z is also the number to check when a reused hole stops holding: re-tightening on the same mark flattens the edge, and a screw whose cup has been re-seated several times holds a fraction of its fresh torque. If the joint will be re-adjusted in service, spec a flat point against a spot-faced flat, or a dog point into a drilled seat, and keep the cup point for set-once assemblies.

What is the MOQ and lead time for these screws?

Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock diameters, 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.