Value Collection 221166BR Shoulder Screw 5/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221166BR is an alloy steel shoulder screw with a 5/8 inch shoulder diameter and 1-3/4 inch shoulder length. The hex socket drive accepts a 5/16 inch hex key for installation. The uncoated alloy steel body meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards, placing this fastener at material grade 8 strength. The 1/2-13 UNC thread provides a secure, standard coarse-thread engagement. Machinists, maintenance technicians, and mechanical assemblers use this style of fastener to create precise pivot points, guide components, and locate moving parts within a mechanical assembly.

Shoulder screws of this configuration are common in industrial machinery, jigs and fixtures, dies, and precision mechanical assemblies where a hardened, close-tolerance cylindrical shoulder must act as a shaft, pivot, or guide pin. The 7/8 inch head diameter and 3/8 inch head height seat flush or counter-recessed in standard counterbored holes. This fastener is appropriate for both light fabrication shops and production assembly environments requiring ASTM A574 compliance.

Key Features

• 5/8 inch shoulder diameter with 1-3/4 inch shoulder length for precise locating and pivot applications
• 1/2-13 UNC coarse thread for reliable thread engagement
• Grade 8 alloy steel construction meeting ASTM A574 strength requirements
• 5/16 inch hex socket drive for high-torque installation with a standard hex key
• 7/8 inch head diameter and 3/8 inch head height for positive seating
• Uncoated finish suitable for applications where additional coatings would affect dimensional tolerances

Compatibility

Designed as a standard shoulder screw for use in jigs, fixtures, dies, and mechanical assemblies requiring a 5/8 inch diameter precision shoulder with 1/2-13 UNC thread and ANSI B18.3 dimensional compliance.

Installation Notes

Installation should be performed by a qualified machinist or mechanical technician using a 5/16 inch hex key or Allen driver. Ensure the counterbored receiving hole is machined to the correct diameter and depth to accept the shoulder properly before threading. De-energize or lock out any machinery before servicing or replacing fasteners in moving assemblies. Do not exceed the torque capacity appropriate for the grade 8 alloy steel thread specification.