Prime-Line
Prime-Line 9090627 1/4in-20 x 5/8in Serrated Flange Bolts Zinc Plated Case Hard
Hex bolt with serrated flange distributes clamping load and resists vibration loosening
- TypeAutomotive Service & Shop Tools
- 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.
Highlights
- 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
Specifications
| Brand | PRIME-LINE |
|---|---|
| Type | Automotive Service & Shop Tools |
| Color | Transparent |
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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