Graco 116326 Socket Head Shoulder Screw

Graco 116326 Socket Head Shoulder Screw

The Graco 116326 Socket Head Shoulder Screw is an OEM-grade shoulder-bolt with a recessed hex (socket) head. It features a smooth, precision-machined shoulder section between head and thread — allowing it to act as a precise pivot, spacer, or bearing shaft in mechanical assemblies rather than just as a fastener.

Uses & Compatible Assemblies

• Graco spray/pump/coating units or fluid-handling machines having internal assemblies with rotating shafts, pistons, bearings or moving parts that require a shoulder bolt (instead of regular screws).
• Linkages, pivot points, shafts or bearing housings inside Graco equipment where precise alignment and smooth rotational or sliding motion is needed.
• Any assembly where part # 116326 is specified in Graco’s parts manual/diagram as the shoulder-screw — especially where there is a need for correct spacing, bearing surface or pivot axis.

Key Features & Advantages

• Shoulder-screw design: smooth shoulder section acts as precise shaft, ideal for pivoting/sliding components — ensuring alignment, reducing wear and enabling smooth motion.
• Socket-head cap: recessed hex drive allows compact, low-profile installation — useful when space is limited and where wrench or external head clearance is constrained.
• Higher strength & clamping force: socket-head shoulder screws are often made from alloy or hardened steel, giving reliable strength for bearing or load-bearing applications.
• Precision & reliability: because of machined shoulder and standardized tolerances, the screw ensures accurate alignment, smooth rotational/sliding motion, and reduces risk of mis-alignment or premature wear.

When & Why to Use / Replace

• Use when original shoulder-screw is worn out, damaged or missing — especially in assemblies with moving parts (shafts, pistons, bearings) — to maintain alignment and safe operation.
• When building or repairing pump/gear/shaft assemblies, valves or other mechanical sub-systems — ensure correct use of shoulder screw for smooth motion and load support.
• Avoid replacing with a vanilla bolt: replacing shoulder screws with regular fully-threaded bolts can cause mis-alignment, binding, wear or failure in dynamic parts.