5/8-11 Grade 8 Hex Head Cap Screws

Grade 8 Hex Cap | The Nutty Company, Inc.

Hex Head Cap Screws Data Sheet (PDF) - The Nutty Company

Bolt Tightening Torque Chart (PDF) - The Nutty Company

5/8-11 Grade 8 Hex Head Cap Screws

5/8-11 Grade 8 hex head cap screws, USS coarse thread, in lengths from 1-1/4" to 12". Available yellow zinc plated and plain (black) (USA and import (Taiwan)). They take a 15/16" wrench. Partially threaded lengths have about 1-1/2" of thread (longer on bolts over 6").

Specifications

  • Size: 5/8-11 (USS coarse)
  • Lengths: 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 2-3/4", 3", 3-1/2", 4", 4-1/2", 5", 5-1/2", 6", 7", 8", 9", 10", 11", 12"
  • Wrench size: 15/16"
  • Grade: SAE J429 Grade 8, 6 radial lines on the head
  • Strength: 150,000 psi min. tensile, 130,000 psi min. yield
  • Finish: yellow zinc plated and plain (black)
  • Origin: USA and import (Taiwan)

Made in North America (USA / Canada)

The length of a cap screw is measured from the under-head bearing surface to the extreme end of the screw.
(FT)=Full Thread | (PT)=Partial Thread
Thread Length on a 5/8-11 bolt is approx. 1-1/2"
Wrench Size = 15/16"

Stock Photos - to verify Thread Length, goto:

Common Uses

  • Heavy equipment and machinery
  • Truck, trailer and suspension work
  • High load and high vibration joints

FAQ

What nut fits a 5/8-11 Grade 8 bolt?
A 5/8-11 Grade 8 hex nut, or a Grade 8 / Grade C lock nut in the same coarse thread. Add a hardened 5/8" flat washer under the nut.

How do I know a bolt is Grade 8?
Grade 8 bolts have 6 radial lines on the head, plus the manufacturer's mark. Grade 5 has 3 lines and Grade 2 has none.

Full thread or partial thread?
Short lengths are fully threaded (FT). Longer lengths are partially threaded (PT), with a smooth shank under the head. Thread length on a partially threaded bolt is about twice the diameter plus 1/4" for lengths up to 6", and twice the diameter plus 1/2" for longer lengths.

Related: All Grade 8 Coarse | Grade 8 Fine Thread | Grade 8 Hex Nuts | Grade 8 SAE Flat Washers | Grade 8 Split Lock Washers

Free shipping on orders over $100, and orders placed before noon EST ship the same day. Purchase orders are accepted from government agencies, schools, hospitals, municipalities and companies with established credit with The Nutty Company, Inc.

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