CRANK Extendable Sit-Stand Frame | Manual Height Adjustment

The Extendable Manual Sit-Stand Desk Frame offers a robust and ergonomic solution for classrooms, ICT suites, libraries and SEN learning environments. Built to withstand the demands of daily student use, the strong steel structure delivers long-lasting durability and stability, even in busy high-traffic settings.

With a manual crank height-adjustment system, teachers and students can easily switch between sitting and standing positions to support healthy posture, improve focus, and encourage greater classroom engagement. The telescopic width design ensures flexible compatibility with a variety of desktop sizes already in your school or college.

Available in Standard and Junior height versions, this sit-stand frame accommodates different age groups — from primary through to secondary and higher education. The powder-coated finish in Black or Silver provides a smart and professional look suitable for modern learning spaces.

Studies show that alternating between sitting and standing can help:

• Reduce fatigue and back strain
• Improve concentration and behaviour
• Support SEN and sensory-based learning
• Promote better circulation and movement during lessons

Custom finishes may be available on request (MOQ/lead time applies), allowing consistent branding across large school installations.

If you require a non-standard colour or configuration, custom solutions may be available on request (MOQ and lead times apply).

Technical Specifications

Standard Frame

• Height Range: 700–1150mm
• Telescopic Width: 1000–1450mm
• Max Load: 70kg
• Column Size: 75 × 45mm
• Feet Size: 700 × 75mm
• Colours: Black, Silver

Junior Frame

• Height Range: 510–810mm
• Telescopic Width: 900–1300mm
• Max Load: 70kg
• Column Size: 75 × 45mm
• Feet Size: 600 × 75mm
• Colours: Black, Silver

Educational Wellbeing & Learning Benefits

Sit-stand desks give pupils the freedom to change position during lessons, helping to combat the negative effects of prolonged sitting. Supporting movement throughout the school day can help:

• Better Focus & Engagement: Improved alertness and reduced restlessness lead to a more productive learning environment.
• Supports SEN & Neurodiversity: Movement helps pupils with sensory needs, ADHD or autism self-regulate and remain engaged in tasks.
• Promotes Healthy Posture: Encourages proper ergonomic positioning to reduce strain and discomfort during long periods of study.
• Boosts Physical Activity: Standing increases energy use, supports circulation, and helps reduce muscle fatigue.
• Enhanced Participation & Confidence: Changing positions empowers students to choose where they feel most comfortable to learn.
• Long-Term Health Habits: Encourages active routines early — reducing long-term risks linked with sedentary behaviour

We have a huge range of Desks and Wooden Tops, but sell them separately because a lot of our trade customers are Office Furniture manufacturers and fit-out companies, who have their own Tops lined up.  If you need a Top for this Desk, then buying from us would mean we'll template it specifically to suit your desk, so you'll have proper fixing holes and metal insert nuts, which will result in hassle-free assembly!

In addition, if you add any Desk Grommets, In-Desk Power Modules or Brush Lined Access Flaps to your order, then we'll cut holes free of charge at the mill to accommodate whatever you've bought (as long as it's from us). Click here to see our range of Wooden Desk & Table Tops, or scroll further down the page, where you'll usually find other products that would work with this desk.

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