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A square hardboard seat. A configuration for your workspace.
Build a practical setup for hands-on work.
NPS 63-Series stools bring a contoured square hardboard seat and a grey steel frame to laboratories, classrooms, art rooms and hands-on workspaces. Choose fixed-height legs for a consistent setup, or tool-secured adjustable legs when your workspace calls for a configurable height. Add a backrest or keep the open, backless format.
The natural brown seat is secured with 16 rivets. Steel frame tubing and welded foot supports create a straightforward, durable structure for daily work. H and HB configurations add chrome-plated leg inserts; B and HB configurations include an adjustable backrest.
DOCUMENTATION YOU CAN CHECK
Manufacturer-backed confidence
Explore NPS warranty coverage, independent test results, emissions documentation and safe-use guidance before you choose.
10-year warrantyOriginal-user manufacturing-defect coverage. Terms and exclusions apply.Read warranty terms ↗
Low-emissions coverage6300 hardboard stools are included in the low-emitting seating bracket. Certificate expires August 2027.View MAS certificate ↗
Safe setup & useAdjust H/HB legs only while unoccupied and upside down. Follow the complete backrest and leg instructions.Read assembly instructions ↗
MAS includes the 6300 hardboard-stool category (August 2026-August 2027). Read the complete manufacturer documents for coverage and setup instructions. Full PDFs open in a new tab.
Manufacturer-listed lead time: 1-2 days
Not a delivery guarantee. Availability, dispatch and freight timing are confirmed with your quote.
Static-load documentation: 6330H grey, legs fully extended, passed a 500 lb seat load held for 24 hours. Read the complete static-load report. This is a static seat test, not a dynamic user or footrest rating.
Choose the same square-seat design in four configurations.
- Fixed, backless: 6318, 6324 and 6330 offer an open seat with fixed-height legs.
- Fixed with a backrest: 6318B, 6324B and 6330B add a backrest with vertical and fore-and-aft adjustment.
- Adjustable, backless: 6318H, 6324H and 6330H use screw-secured telescoping inserts.
- Adjustable with a backrest: 6318HB, 6324HB and 6330HB combine both adjustments.
The selector uses 18, 24 and 30 inch nominal fixed labels or base adjustable labels. These identify configurations, not finished seat-height measurements. Select a configuration to view its price in the buying area.
Square-seat details in real workspaces
A contoured hardboard seat is fastened with 16 rivets.
Choose a nominal 18, 24 or 30 inch fixed-height configuration.
H models add chrome-plated, tool-secured leg inserts.
HB models combine adjustable legs with an adjustable backrest.
Set all four inserts to the same height and securely tighten the supplied fasteners before use.
The steel frame includes welded foot supports and a grey finish.
Set up once, then check before use.
For H and HB models, adjust the stool only while it is unoccupied and upside down. Set all four inserts equally and secure the fasteners before returning the stool upright. This is a tool-secured system, not a seated lever or gas-lift adjustment.
B and HB backrests use the backrest assembly steps. Follow the full manufacturer instructions for your configuration. Inspect fasteners before use and at least every six months, or after heavy or frequent use. Keep all feet stable on a flat, dry surface and never stand on the seat or foot supports.
Frequently Asked Questions
How do fixed and adjustable configurations differ?
Models without a letter suffix and B models have fixed-height legs. H and HB models add chrome-plated, screw-secured leg inserts for height adjustment. All are part of the same 6300 square-seat hardboard stool family.
What do the 18, 24 and 30 inch choices mean?
These numbers identify nominal fixed-height configurations or adjustable base configurations, as labeled in the selector. They are configuration names, not finished seat-height measurements. Check your work-surface height, underside clearance, knee room and foot support before choosing.
Which models have a backrest?
B and HB models include a backrest that adjusts up and down and forward and back. Models without a suffix and H models are backless. Choose the backrest option and height configuration together.
What is the seat made from?
The contoured square seat is natural brown hardboard, secured with 16 rivets. It is paired with a grey steel frame and welded foot supports.
How is an H or HB stool adjusted safely?
Keep the stool unoccupied and upside down for height adjustment. Remove the insert fasteners, set all four inserts equally, then reinstall and securely tighten the supplied fasteners following the complete assembly instructions. Never adjust while seated. Fixed-height models do not use these leg-adjustment steps.
What assembly and inspection are needed?
Use the backrest assembly steps for B and HB models and the adjustable-leg steps for H and HB models. Inspect fasteners before use, at least every six months and after heavy or frequent use. Do not stand on the seat or foot supports. Stop use if the stool is damaged or unstable.
What does the 500 lb static load documentation cover?
NPS lists a 500 lb static seat load. The complete Bureau Veritas report records a 24-hour static seat test on a grey 6330H with its legs fully extended. This is a static seat-load result, not a dynamic-use or foot-support load rating.
Does the listed lead time mean delivery in 1-2 days?
No. The manufacturer lists a 1-2 day lead time. Availability, order processing, dispatch and carrier transit affect arrival. Confirm timing and freight for your selected configuration and quantity before ordering.
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