Value Collection 221022PR Shoulder Screw 5/16 in Alloy Steel

Product Description

The VALUE COLLECTION 221022PR is an alloy steel shoulder screw with a 5/16-inch shoulder diameter and a 3/8-inch shoulder length. It features a 1/4-20 UNC thread and a hex socket drive sized at 5/32 inches, making it compatible with standard hex keys and Allen drivers. The uncoated alloy steel construction meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards. This type of fastener is installed by machinists, millwrights, and maintenance technicians in precision assemblies where a smooth, hardened shoulder is needed to act as a pivot, guide pin, or bearing surface.

Shoulder screws of this specification are commonly used in jigs, fixtures, linkages, and mechanical assemblies found in industrial and manufacturing environments. The 5/16-inch shoulder provides a precise bearing surface, and the 1/4-20 threaded shank anchors the fastener securely into a tapped hole. This screw is suited for both light fabrication shops and production floor applications where consistent dimensional tolerance is required. Sold individually with a minimum order quantity of 25 pieces.

Key Features

• 5/16-inch shoulder diameter (0.3120 inches decimal) for precision fit in bored or reamed holes
• 3/8-inch shoulder length provides a controlled bearing or pivot surface
• 1/4-20 UNC threaded shank for secure anchoring in standard tapped holes
• 5/32-inch hex socket drive for use with standard Allen keys or hex drivers
• Uncoated alloy steel, Grade 8 material, meeting ASTM A574 and ANSI B18.3 standards
• Head diameter range 0.4190 to 0.4380 inches; head height range 0.2090 to 0.2190 inches

Compatibility

Designed as a standard shoulder screw for use in precision mechanical assemblies, fixtures, and linkages requiring a 5/16-inch shoulder diameter and 1/4-20 UNC threaded engagement.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a 5/32-inch hex key or Allen driver. The receiving hole for the shoulder should be sized and finished to match the shoulder diameter tolerance for proper fit. Do not use an impact driver on hex socket shoulder screws, as this risks thread or socket damage. Ensure the mating tapped hole meets the 1/4-20 UNC thread specification before installation.