ASTM Bolt Hex Flange Bolts

Xiaoguo® is a professional China supplier that produces ASTM Bolt Hex Flange Bolts manufactured with strict quality control and premium alloy steel, delivering exceptional strength, consistent torque performance, and superior anti‑loosening stability. Built to meet official ASTM standards, these hex flange bolts ensure reliable fastening for automotive, machinery, construction, and heavy‑duty industrial use. Contact us now to source high‑quality ASTM Bolt Hex Flange Bolts directly from the factory.

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Product Description

For standard sizes that we keep in stock, the turnaround time is short. Once we confirm the order, workers grab pre-made blanks, finish the final threading and surface coating, then run inspections and pack the parts. This whole process usually takes 7 to 10 business days, with no extra wait for raw materials or tool setup. It works for small to medium orders that don’t need custom size or grade changes.ASTM Bolt Hex Flange Bolts that are made to order take longer, and the timeline mostly depends on order quantity and how fast we can get raw materials. Factories first source qualified steel rods, go through cold forging and heat treatment, then process the threads and add surface coating. Bulk orders that go beyond standard stock levels often take 15 to 25 workdays, including time for batch testing to meet ASTM standards.Orders with special surface finishes or non-standard lengths add a few extra days. Extra coating steps or custom machining need separate scheduling, which pushes the total cycle to 25 to 30 days. Rush orders can shave off a little time, but we don’t skip any full inspection steps to stay compliant. Delays hardly happen if materials are on hand and specs are finalized upfront.

Product tolerance range

ASTM Bolt Hex Flange Bolts follow fixed dimensional tolerance rules for common imperial sizes, covering shank diameter, flange width and head height.

Thread tolerance	Follows ASME B1.1 Class 2A. For UNC threads, major diameter has a tolerance of about ±0.001–0.003 in across sizes 1/4" to 3/4". Pitch diameter tolerance is tighter, around ±0.0008–0.002 in, ensuring proper fit with nuts.
Flange diameter tolerance	Bearing diameter (dc1) has a minimum value per size; for 1/4" it’s 0.480 in, 3/8" 0.730 in, 1/2" 0.980 in, with no upper limit specified, just a minimum to maintain clamping area.
Head height tolerance	Total head height (including flange) has a ±0.010–0.020 in range. For 1/4" bolts, max height is ~0.230 in, min ~0.210 in; larger sizes like 3/4" have a wider ±0.020 in band.
Length tolerance	Nominal length (L) for bolts under 6" uses +0/-0.030 in; for lengths over 6", tolerance opens to +0/-0.060 in. Fully threaded shanks follow these same length limits.
Runout tolerance	Flange bearing surface runout (FIM) is capped at 0.010 in for 1/4", 0.012 in for 3/8", up to 0.020 in for 3/4" bolts, keeping the flange flat and stable under load.

Q&A session

How long is the lead time for standard and customized orders of the ASTM Bolt Hex Flange Bolts?

Standard in-stock items ship within 7-10 working days after receiving deposit payment. Customized specifications (special sizes, surface treatments) take 15-20 working days, depending on order volume. We will send real-time production updates and tracking numbers once the goods are dispatched. Rush orders can be prioritized if you share your urgent delivery deadline in advance, without sacrificing product quality.

ASTM Bolt Hex Flange Bolts