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Graco 100155 Nut

Graco 100155 Nut is a genuine hex jam nut (5/8-18 UNF) designed for secure locking in tight spaces across Graco Reactor 3 and Elevator assemblies.

  • OEM Part: 100155
  • Type: Hex Jam Nut 5/8-18
  • Fits: All Graco Reactor 3 Models & Elevator Supports
  • Use: Locking and vibration-resistant fastening

$22.55
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Genuine Graco 100155 Nut — Hex Jam 5/8-18 (Jam)

A durable, low-profile hex jam nut used across Graco assemblies where a thin lock-nut is required—commonly in Reactor 3 TSL/system mounts and elevator components. Always verify against your model’s parts diagram before ordering.

Compatible Machines

  • Reactor 3 E-20 Spray Foam Proportioner (listed in TSL System Kit)
  • Reactor 3 E-30 Spray Foam Proportioner
  • Reactor 3 H-30 Hydraulic Proportioner
  • Reactor 3 H-50 Hydraulic Proportioner
  • Graco Elevators & Pump Supports (various assemblies that specify jam nut 100155)

Quick Specs

Part Number 100155
Type Nut, Hex, Jam (thin lock-nut)
Thread 5/8-18 UNF (per Graco parts lists)
Common Use TSL/system mounts on Reactor 3; elevator/restrictor assemblies; general fastening where a thin jam nut is required.
Fits Families Reactor 3 (E-20, E-30, H-30, H-50) and select Elevator & Pump Support assemblies.

Why choose 100155?

  • OEM geometry for proper clamping with limited clearance (thin jam profile).
  • Secure retention when locked against a primary nut to resist vibration loosening.
  • Direct replacement cited in Graco parts lists for R3 TSL kits and elevator assemblies.
Installation Tips
  • Verify thread: 5/8-18 UNF and mating hardware before installation.
  • Use two-nut/jam-nut technique: seat the primary nut to spec, then lock with 100155.
  • Re-check torque after initial run-in, especially on vibrating assemblies (rigs/trailers).

Frequently Asked Questions

It’s a genuine OEM hex jam nut (5/8-18) used where a thin locking nut is specified—commonly in Reactor 3 TSL/system mounts and in Elevator & Pump Support assemblies.

Retail documentation lists “all R3 models.” However, Graco updates kits over time—always confirm in your model’s current exploded diagram to verify position and quantity before purchase.

In Graco literature it appears in the TSL System Kit for Reactor 3 (e.g., E-20 kits) and in Elevators & Pump Supports bill-of-materials as a jam nut on mounting/restrictor hardware.

Graco manuals typically specify torque at the assembly level rather than per fastener. Follow the torque spec for the mated component in your model’s service manual; if unspecified, use standard practices for a 5/8-18 jam nut and re-check after run-in.

Use OEM 100155 for correct thickness and thread engagement. If corrosion resistance is a concern, choose the material/finish specified in your kit. Always match thread (5/8-18) and jam-nut thickness.

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