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Graco 100307 Nut

The Graco 100307 Nut is a durable 3/8-16 full hex nut designed for secure fastening in Graco pumps, regulators, and assemblies. Ideal for maintaining OEM strength and alignment.

  • Part Number: 100307
  • Type: Full Hex Nut
  • Thread Size: 3/8-16 (UNC)
  • Used In: Fire-Ball Pumps, Fluid Regulators
  • OEM Quality: Genuine Graco hardware

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Graco 100307 Nut — Specs, Fit & FAQs

Compatible Machines / Systems

The Graco 100307 Nut is a common hardware fastener used across multiple Graco assemblies. Based on Graco parts lists, it appears in the following systems (model examples shown):

  • 15:1 Fire-Ball Undercoater Pump — selected drum/base/dolly assemblies (e.g., Model 226342)
  • High-Pressure Fluid Regulator — Model 217576 (Series D) and related regulator assemblies

Product Overview

The Graco 100307 Nut is a full hex nut used to fasten and secure components within Graco equipment. It is a general-purpose hardware item commonly found in mounting points, brackets, and regulator/pump sub-assemblies.

Key Specifications

Part Number 100307
Description Nut, full hex
Thread Size 3/8-16 (UNC)
Typical Use General fastening in pumps, regulators, frames, and accessory mounts
Genuine OEM Graco original replacement part

How to Confirm Fit

  • Match the thread size (3/8-16) to the stud/bolt on your assembly.
  • Check your machine’s parts manual; look for item 100307 in the exploded diagram/parts list.
  • For exposed or high-vibration locations, apply the manufacturer-recommended torque and consider thread-locking where specified.

Frequently Asked Questions

Functionally, yes—100307 is a 3/8-16 full hex nut. Using the genuine Graco part ensures consistency with the original hardware and maintains warranty/fit expectations where applicable.

Examples include 15:1 Fire-Ball Undercoater Pump assemblies (e.g., Model 226342) and High-Pressure Fluid Regulator assemblies (e.g., Model 217576 Series D). Your specific sprayer or system may also use this nut—check the parts list for confirmation.

It’s best to use OEM-spec fasteners (like 100307) in load-bearing or safety-critical locations. If substitution is necessary, ensure identical thread, grade, and finish, and follow Graco torque specifications.

Use thread-locking compound only where specified by your manual. Many Graco assemblies rely on proper torque and lock-washers; follow the service guide for your exact model.

Quantity varies by assembly. Some pump frames and regulator mounts may call for multiple 100307 nuts. Refer to your parts diagram to order the correct count.

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