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Graco 100338 Nut

The Graco 100338 Nut is a durable jam nut (1/2-13 UNC) used in multiple Graco assemblies for securing components and ensuring tight lock connections.

  • Part Number: 100338
  • Thread Type: 1/2-13 UNC
  • Type: Jam / Lock Nut
  • Used In: Rolling Drain Carts, Ram Units, Boom Assemblies
  • Material: High-strength steel construction

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Compatibility & Key Details for Graco 100338 Nut

Compatible Machines / Assemblies

The Graco 100338 Nut is a jam nut used across multiple Graco assemblies wherever a 1/2-13 UNC jam nut is specified. Confirm against your machine’s parts list.

  • Rolling Drain Cart — Models 218969 & 235346 (listed as “Nut, jam, 1/2-13 UNC” in the parts list)
  • Ram Supply Unit — Model 970018 (appears as 100338 in the hardware list)
  • Pneumatic / Boom Arm Assemblies — various configurations referencing part 100338
  • Other Graco equipment that specifies 100338 in its official service manual or exploded diagram

What is Graco 100338?

Graco 100338 is a jam nut (thin lock nut) commonly used to secure components or lock another nut in position on a 1/2-13 UNC threaded fastener. Typical use cases include carts, rams, and frame/arm sub-assemblies.

Attribute Details
Part Number 100338
Type Jam Nut (thin, for locking/retention)
Thread 1/2-13 UNC
Typical Height ~0.313 in (reference from Graco parts descriptions)
Where Used Drain carts, ram units, boom/arm assemblies, and other Graco equipment that call out 100338.
How to Verify Fit Match your machine’s parts manual; confirm thread (1/2-13 UNC) and “jam” profile.

Fitment & Installation Notes

  • This is a generic Graco hardware item; it is not limited to a single sprayer model.
  • Use as a lock/retention nut against a standard full-height nut when specified.
  • Torque: follow the specific equipment manual’s torque specification for the joint.
  • Replace any damaged or deformed hardware during maintenance or rebuilds.

Frequently Asked Questions

No. It is a jam nut (1/2-13 UNC) used across many Graco assemblies. Always confirm with your equipment’s parts manual to ensure the correct hardware is specified for your serial/variant.

A jam nut is thinner and typically used with a full-height nut to lock it in place and resist loosening, especially in vibration-prone assemblies.

Check your Graco parts diagram for the exact part number and thread callout (1/2-13 UNC). If your manual lists 100338, this nut is the correct replacement.

Torque values depend on the assembly. Always follow the torque specification provided in the service manual for your specific machine or sub-assembly.

It can, but it’s designed as a jam/lock nut. For primary clamping, use the full-height nut specified for the joint and apply 100338 as the lock nut when called out.

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