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. :contentReference[oaicite:3]{index=3}
• 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. :contentReference[oaicite:4]{index=4}
• 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. :contentReference[oaicite:5]{index=5}
• 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. :contentReference[oaicite:6]{index=6}

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.