Socket Head Cap Screw
HOLO-KROME/ALLEN Socket Head Cap Screw - Package Qty: 100   Key Size: 3/16   Length Under Head: 1-1/4   Diameter & Threads Per Inch: 1/4-28 UNF

Socket Head Cap Screw

Made In The USA
Item #: 71-773-066
System of Measurement: Inch
Thread Size: 1/4"-28
Length Under Head: 1-1/4"

Master Catalog Listing

Only sold in increments of 100.

Need a different size, length or brand?

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  • Diameter and pitch markings found on each socket head cap screw.
  • Holo-Code lot traceability number stamped on socket heads to allow tracking without the box.
  • Closely controlled fillet between head and body provides maximum fatigue strength.
  • Made in USA.


  • Critical application where high tensile strength is required 18,000 PSI min. (0 - 1/2") 17,000 PSI min. (over 1/2").
  • Applications requirung high temperature resistance, corrosion resistance and other special characteristics, special materials can be formed with the same process to provide the same benefits.


  • Alloy steel for optimum tensile, impact strength and fatigue strength.
  • Precision 3A threads for greater clamping force.
  • UNC: coarse thread series
  • UNF: fine thread series

Technical Data

Measurement And Testing Capabilities Include:
  • High tensile strength fasteners.
  • Proof load.
  • Socket broach depth.
  • Thread major diameter.
  • Angles and radii.
  • Rockwell hardness.
  • Thread functional diameter.
  • Linear measurements.
  • Diameter measurements.


All Items Sold In Package Quantity Only.
Holo-Krome 73066 1/4"-28 x 1-1/4" Grade 8 Socket Head Cap Screws
Product Specifications
System of Measurement Inch
Thread Size 1/4"-28
Length Under Head 1-1/4"
Material Alloy Steel
No. of Pieces in Pack 100
Type Socket Head Cap Screw
Diameter & Threads Per Inch 1/4"-28 UNF
Drive Size 3/16"
Head Type Socket
Key Size 3/16"
Prop. 65 Yes
Series 1960 Series
Thread Standard UNF
Thread Type Fully Threaded
Tool Material Heat treated alloy steel
Weight 0.021 lbs.
Prop 65 Warning Many metalworking products do contain metals that are included in the latest Prop 65 warning. Exposure to the elements can be harmful. May cause cancer and reproductive harm.