EC300 Replacement Screw & Hardware Kit

Keep your EC300 securely assembled and ready for daily use with this complete replacement screw and hardware kit, including the essential fasteners and Allen wrench needed for installation.
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EC300 Replacement Accessory

EC300 Replacement Screw & Hardware Kit

A complete replacement hardware set designed for the ProtoArc EC300 Ergonomic Office Chair, including the essential screws and T-handle Allen wrench used for chair assembly and hardware replacement.

What's Included

The kit includes the replacement screws required for the main EC300 chair components.

G1 Five-Star Base Screws M8×16 · 5PCS
G2-Long Armrest Screws 1/4×60 · 2PCS
G2-Short Armrest Screws 1/4×50 · 4PCS
G3 Tilt Mechanism Screws M8×35 · 4PCS
G4 Lumbar Support Screws ST6×20 · 3PCS
G5 Backrest Screws M8×20 · 3PCS
G6 Headrest Screws M5×16 · 2PCS
T-Handle Allen Wrench 1PC
Package Contents: 23 Replacement Screws + 1 T-Handle Allen Wrench

Compatibility

This replacement hardware kit is designed specifically for the ProtoArc EC300 Ergonomic Office Chair.

Please confirm that your chair model is EC300 before placing your order. Compatibility with other ProtoArc models or third-party chairs is not guaranteed.

Before You Order

  • Please confirm that your chair model is EC300 before purchasing.
  • Check the EC300 User Manual to identify the screw type and installation location you need.
  • This listing includes replacement screws and the T-handle Allen wrench only. Other chair components are not included.
  • If you are unsure whether this hardware kit is suitable for your chair, please contact ProtoArc Customer Support before placing your order.

Final Sale Notice

This replacement hardware kit is a final-sale accessory and is not eligible for returns or exchanges, except where required by applicable law.

Please carefully confirm your chair model and the replacement hardware you need before purchasing.

Need Help?

Questions about compatibility, missing hardware, installation, or replacement parts? Our support team is here to help.

support@protoarc.com

PRODUCT DETAILS

EC300 Replacement Screw & Hardware Kit

Product Type: Replacement Screw & Hardware Kit
Compatibility: EC300 Ergonomic Chair
Color: Black / Silver
Application: Chair Assembly & Hardware Replacement

SPECIFICATIONS

G1 Five-Star Base Screws: M8×16, 5PCS
G2-Long Armrest Screws (Inner×1): 1/4×60, 2PCS
G2-Short Armrest Screws (Outer×2): 1/4×50, 4PCS
G3 Tilt Mechanism Screws: M8×35, 4PCS
G4 Lumbar Support Screws: ST6×20, 3PCS
G5 Backrest Screws: M8×20, 3PCS
G6 Headrest Screws: M5×16, 2PCS


PACKAGE CONTENTS

Replacement Screws ×23
T-Handle Allen Wrench ×1

COMPATIBILITY NOTICE

Designed specifically for the EC300 Ergonomic Chair.
Please confirm your chair model before purchase.
This hardware kit is intended for replacement or assembly use with compatible EC300 chair components.
If you have any questions, please contact us at support@protoarc.com.