Roll Form Tap Drill Chart — Unified Threads (UNC/UNF/UNEF/UN) at 65% Thread, 0-80 to 2-4.5, inch

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 (Roll Form Tap Drill Chart — Unified Threads (UNC/UNF/UNEF/UN) at 65% Thread, 0-80 to 2-4.5, inch) 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 is the roll-form hole bigger than the cut-tap drill, and how do I pick between 65% and another thread percentage?

A cut tap removes metal to carve the thread, so the drill only needs to leave the right amount to carve away; a forming tap has nothing to remove — it must push enough material to fill the thread profile completely, which means starting from a bigger hole that leaves exactly the displacement volume the thread form needs. That is why the same 1/4-20 thread takes a #7 drill (0.201 in) for cutting but a #1 (0.228 in) for forming — the chart above is the forming side. The percentage of full thread is the lever trading torque against strength: a higher percentage makes a taller, stronger thread but the forming tap pushes far more material, torque climbs steeply and tap breakage risk follows; 65% — where this chart is fixed — is the widely used production point because thread strength rises faster than percentage at first and flattens out, so the last 20% of thread height costs disproportionate torque for marginal strength. If your joint calculation genuinely needs more (thin wall, high clamp load), that is an RFQ conversation: state the alloy, hardness, thread size and the strength requirement, and the forming percentage and hole size can be recalculated from the same formula before tooling is committed. And verify the material forms at all — ductile steels and aluminums form cleanly; gray cast iron and brittle alloys chip instead of flow and must be cut.

What is the MOQ and lead time for threaded parts and tooling referenced by this chart?

The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Confirm the exact schedule against quantity, size mix and any tooling items at quotation.