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What Is the JAWS® Small Screed Chair?
JAWS® Small is a stay-in-place concrete screed chair designed to support 2x4 wood screeds and aluminum, magnesium, or steel screed rails up to 1-1/2″ (40 mm) wide.
The patented JAWS® “teeth” securely grip the screed rail during placement and release easily as you move down the pour line.
Designed For
- Slab-on-grade construction
- Elevated slabs
- Concrete overlays
- Vapor barrier slabs
- Bridge decks and infrastructure projects
- Super flat floors requiring FF/FL compliance
Ideal for use on projects requiring compliance with ACI 302.1R-04, ACI 117 and ASTM E1155. Iowa DOT approved.
Key Specifications
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Product Number: 082411JAW15 (Small)
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Overall Height: 3.50″
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Supports: 2x4 lumber or aluminum/magnesium/steel rails up to 1.50″ wide
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Minimum Height (using 2x4): 5-1/4″ (133 mm) from bottom of chair to finished elevation
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Fits Mounting Structures: 3/8″–5/8″ (10–16 mm), 1/2″ ideal
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Load Capacity: Holds up to 1,000 lbs
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Spacing: Every 3–4 ft depending on rail length and sub-grade conditions
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Coverage: 100 JAWS Small per bag (approx. 3,000 sq ft / 278 m²)
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Material: Impact-resistant medical grade polypropylene
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Installation Tool: Use MAKO Driver for consistent, accurate setup
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Country of Origin: Made in USA
Compliance, Approvals & Patents
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Standards: ACI 302.1R-04, ACI 117, ASTM E1155
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Approvals: Iowa DOT approved (other states pending)
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Patents: 8,096,182 | 8,544,182 | Patent Pending
How It Works
- Insert mounting structure (rebar, rod, stake, etc.) between 3/8″–5/8″.
- Slide JAWS Small onto mounting structure.
- Twist slightly to secure screed rail less than 1.5″ wide.
- Use MAKO Driver to set elevation accurately.
- Place screed rail and begin concrete placement.
JAWS Small is designed as a stay-in-place form and remains in the slab after placement.
Why Contractors Choose JAWS Small
- JAWS “teeth” hold rails securely yet release easily
- Will not bounce off rebar or rod during placement
- Works with 2x4 wood screeds and metal rails
- Virtually indestructible under normal placement conditions
- Non-conductive and non-corrosive for extreme environments
Common Applications
- Slab-on-grade
- Elevated slabs
- Concrete overlays
- Vapor barrier installations
- Industrial and commercial flooring
- Infrastructure projects
Frequently Asked Questions
What screed sizes does JAWS Small support?
JAWS Small supports 2x4 wood screeds and aluminum, magnesium, or steel rails up to 1-1/2″ wide.
What mounting structures can be used?
Fits mounting structures from 3/8″ to 5/8″ including rebar, threaded rod, stakes, dowels, PVC, or conduit.
How far apart should JAWS Small be spaced?
Typically every 3–4 feet depending on rail thickness, length, and sub-grade conditions.
Can JAWS Small be left in the slab?
Yes. JAWS screed chairs are designed as stay-in-place forms made from medical grade polypropylene and will not corrode.
Can it be used with hand or mechanical screeds?
Yes. JAWS Small works with both hand and mechanical screeds.
Downloads
JAWS Small Product Data Sheet
