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Zinc-plated serrated flange bolts in clear packaging

Prime-Line

Prime-Line 9090627 1/4in-20 x 5/8in Serrated Flange Bolts Zinc Plated Case Hard

SKU CH-PZNS-C9G51

Hex bolt with serrated flange distributes clamping load and resists vibration loosening

  • Product typeAutomotive Service & Shop Tools
  • Product colorTransparent
  • Built-in flange distributes load evenly
  • Serrations grip surface to resist vibration loosening
  • Eliminates separate washer for faster assembly
  • Meets ASME B18.2.1, B18.6.3, B1.1 standards
  • Zinc-plated case-hardened steel for durability

Product Identity

The Prime-Line 9090627 is a 1/4in-20 by 5/8in serrated flange bolt finished in zinc-plated case-hardened steel. It is intended for installers and technicians who need a single-piece fastener that distributes clamping load without a separate washer.

Fit and Limitations

These bolts suit applications requiring coarse UNC-2A threads and a blunt point where vibration resistance from serrated flanges is desired. They are not for buyers who need fine-thread pitch, metric dimensions, or a kit that includes matching nuts or flange nuts.

Installation Notes

The hex head allows standard socket or wrench engagement and the integrated flange removes the separate-washer step on the bolt side. A washer is still required on the nut side unless a flange nut is used, and the serrations can damage finished surfaces if over-tightened.

How it compares

Measured against everything we stock in Solar-Powered Chargers & Devices, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 68% of the 874 comparable items (median $25.99).

Specifications

Product
Brand namePRIME-LINE
Product typeAutomotive Service & Shop Tools
Product colorTransparent

Questions about this item

What thread size must the nut or tapped hole have to match these 9090627 bolts?

The bolts use a 1/4‑20 UNC‑2A coarse thread, so the mating nut or threaded hole must be 1/4‑20 UNC‑2B.

Will the serrated flange on these bolts damage the softer aluminium rails I plan to keep on my array?

The serrations are designed to bite into the contact surface; on soft aluminium they can leave marks, so consider adding a flat washer under the flange if surface damage is a concern.

How can I confirm the bolts meet the listed ASME standards after installation?

Check that the head markings correspond to the ASME B18.2.1, B18.6.3 and B1.1 specifications referenced for this fastener.

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