Graco 116287 External Star Stainless Steel Washer

Graco 116287 External Star Stainless Steel Washer

The Graco 116287 External Star Stainless Steel Washer is an OEM-specified external-tooth (star) lock washer. It is made of stainless steel and designed to provide a secure, vibration-resistant lock under bolts or screws — ensuring nuts or bolt heads remain tight even under mechanical stress or vibration.

Where It’s Used / Compatible Assemblies

• Graco spray, pump, or fluid-handling equipment assemblies that call for part # 116287 as their external lock washer. ([Official parts listing])
• Housings, manifolds, covers, panels or mounting brackets in Graco machines — wherever a locking washer is needed to prevent loosening under pressure, vibration or repeated use.

Product Features & Benefits

• External-tooth / star-lock design — teeth bite into mating surface and bolt/nut, giving extra grip and preventing loosening.
• Stainless-steel construction — resists corrosion and suitable for harsh, industrial / paint / coating / fluid-handling environments.
• OEM part from Graco — ensures correct size, fit, and compatibility for the machines designed to use 116287.
• Helps maintain mechanical integrity — by securing fasteners firmly, reduces risk of leaks, misalignment or mechanical failure due to loose bolts.

When & Why to Use / Replace

• Use during assembly or re-assembly of Graco equipment when the original lock-washer is missing, worn, or corroded.
• Replace if washer shows wear, deformation, rust (if not stainless), or if bolt/nut loosens easily — to restore secure fastening.
• Particularly important in high-vibration, high-pressure, or heavy-duty spray/coating operations where mechanical locking and integrity matter.