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Graco 103450 Nut Hex Self-Lkg

The Graco 103450 Nut Hex Self-Locking provides secure fastening in vibration-prone assemblies such as hydraulic motors and tie-rod systems.

  • Thread Size: 5/16-18 UNC
  • Type: Self-locking hex nut
  • Use: Prevents loosening in Viscount II motor assemblies
  • Compatible Models: 217022 D, 217338 E, 235345 A

$15.18
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Part Overview & Key Details

The Graco 103450 is a Nut, Hex, Self-Locking with a 5/16-18 UNC thread, used to resist loosening under vibration. It’s commonly applied in structural/tie-rod and bracket locations across Graco hydraulic drive assemblies and related equipment.

Compatible Machines / Assemblies

  • Graco Viscount II Hydraulic Motor – Model 217022 (Series D)
  • Graco Viscount II Hydraulic Motor – Model 217338 (Series E)
  • Graco Viscount II Hydraulic Motor – Model 235345 (Series A)

Key Specifications

Part Number 103450
Description Nut, Hex, Self-Locking
Thread 5/16-18 UNC
Typical Use Vibration-resistant fastening on tie-rods, brackets, and motor/frame interfaces
Category Graco replacement parts / fasteners

Fitment & Usage Notes

  • Replace self-locking nuts after removal to maintain locking performance.
  • Confirm 5/16-18 thread and mating hardware length/grade before installation.
  • Tighten to the torque value specified in your machine’s service manual.
  • Use genuine Graco parts for best fit, durability, and compliance.

Frequently Asked Questions

Functionally it’s a 5/16-18 self-locking hex nut, but Graco’s OEM part ensures correct spec, material, and fit. For warranty and reliability, use the OEM part where listed.

Verified models include Viscount II Hydraulic Motor 217022 (Series D), 217338 (Series E), and 235345 (Series A). Check your machine’s exploded parts diagram to confirm usage.

Yes—self-locking nuts can lose their prevailing-torque feature after use. Replace whenever removed or if resistance is noticeably reduced.

Torque varies by application (location, bolt grade, lubrication). Always follow the torque specification in your specific Graco service manual or parts list notes.

While a generic 5/16-18 lock nut may fit, using the Graco 103450 helps ensure correct material class, geometry, and durability under vibration—recommended for safety and longevity.

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