If you’re sourcing threaded fittings for an OEM program, 1 3/16-12 UN Hex plug is the kind of part we quote from CAD/STEP—not from a random photo.

What we check before quoting

Most delays come from fuzzy prints. For this threaded plug, we look early at:

• thread pitch mismatch
• hex size for field tools
• plating in corrosive service

Materials, threads, and finish

Materials: 1020, 1045, 12L14, 1215, Q235B, 42crmo etc. (High strength and excellent machinability).    / 201,304, 316, 316L, 303, etc. (For superior corrosion resistance and high-hygiene environments).

Threads: NPT, NPTF, BSPP (G), BSPT (R/RP), Metric (M), UNF, UNEF, etc. (99% verified by Go/No-Go gauges).

Finish: Electroless Nickel Plating, Zinc Plating (Clear/Yellow), Passivation, Anodizing, Black Oxide, Heat treatment , Chrome plated,Dacromet,etcs.

Tolerance reference: Standard Tolerance:±0.02mm Critical dims should still be marked on your 2D.

Where this product usually shows up

Test ports, blank-offs, and service plugs on manifolds or valve bodies when hex access and seal style are already defined.

We don’t invent pressure ratings or media compatibility here. If your drawing or customer spec states them, we machine and inspect to those callouts.

How this part is usually made

Shop route is typically precision CNC machining in our Yuhuan plant. Secondary ops (plating, passivation, heat treat) only when specified.

Capability note from our spec sheet: Hot Forging / Red Punching: Eliminates internal porosity and enhances high-pressure resistance. Cold Heading: Ideal for high-speed, cost-effective mass production. Precision CNC…

First articles can include dimensional checks on the critical features you mark. Say what you need on the RFQ so inspection matches your buyer pack.

What to send for a quote

Email info@sspipefitting.com or use the inquiry form on this page. A clean package looks like:

• CAD/STEP + 2D with tolerances
• Material grade and finish
• Thread standard on each port
• Quantity (pilot + annual if known)
• Any documents you need (MTR, dimensional report)

MOQ guidance: Moq 2000pcs . Pilot lots are discussable once the drawing is frozen.

Hongqian is set up for repeat OEM lots, not one-off trading stock. If 1 3/16-12 UN Hex plug matches your BOM, send the print and we’ll reply with manufacturability notes first.