ASME B18.3 Hex Socket Head Shoulder Screws (Inch Series)

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 B18.3 Hex Socket Head Shoulder Screws (Inch Series)) 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.

How do I convert a shoulder screw requirement between the inch and metric lines?

By shoulder diameter and duty, not by thread — the two standards do not share sizes. A 6 mm shoulder sits between the 3/16 in (4.76 mm) and 1/4 in (6.35 mm) inch sizes, so an inch machine taking metric screws needs the bore re-cut, not just the screw swapped. Compare the pairing tables on this page and the ISO 7379 page: pick the nearest shoulder, then verify the thread length b still gives the clamp you need. Where equipment is documented in one system, staying in its own series avoids mixed-unit assemblies.

What should an RFQ for ASME B18.3 shoulder screws state?

The designation (ASME B18.3), shoulder diameter and shoulder length (length is application-selected — the collected table carries geometry and thread data only), material and hardness, finish, head style, and quantity per size. The thread size and TPI follow the shoulder per the table but should be confirmed against the drawing; commercial terms follow the quotation.

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.