Made in the USA • Patented • Jobsite-Proven • Non-conductive • Non-corrosive
What Is the Adjustable JAWS® Small Concrete Screed Support?
The Adjustable JAWS® Small Concrete Screed Support is a bundled MAKO system designed for fast, accurate grade setting using 2x4 wood screed rails and other screed rails up to 1-1/2″ (40 mm) wide.
This bundle combines JAWS® Small Screed Chairs with FinStand® Adjustable Supports to create a stay-in-place, height-adjustable screed support system for elevated decks, sloped slabs, bridge work, and super flat floor projects.
Base Plate 4.5 is NOT included. This bundle is intended for direct attachment to wood or metal decks using the FinStand fastening holes.
What’s Included
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100 JAWS® Small Screed Chairs
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100 FinStand® Adjustable Supports (Product #08244STND)
IMPORTANT: Threaded rods (all-thread), hex nuts, and flat washers are sold separately.
Designed For
- Elevated decks (wood or metal)
- Sloped slabs and grade transitions
- Bridge decks, waterways, and power plant concrete projects
- Super flat floors requiring FF/FL compliance
- Contractors who want adjustable grade control and repeatable setup
Ideal for use on super flat floors to stay compliant with ACI 302.1R-04, ACI 117, and ASTM E1155. Iowa DOT approved.
System Compatibility
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Screed Rail Supported: 2x4 wood screed rails and aluminum/magnesium rails up to 1-1/2″ (40 mm) wide
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JAWS Mounting Range: Fits rebar or rod 3/8″ to 5/8″ (10–16 mm)
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Threaded Rod: FinStand uses 1/2″-13 all-thread (cut to length based on slab depth)
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Vertical Adjustment: Up to 1-3/4″ (45 mm) using nut and washer on the all-thread
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Spacing Guideline: Place supports every 3–4 ft (1 m) depending on rail length and sub-grade conditions
Key Specifications
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Minimum Assembly Height: Minimum height using a wood 2x4 from the bottom of the FinStand to finished elevation is 6-1/4″ (158 mm)
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Load Capacity: Holds up to 1,000 lbs (system-dependent and per product ratings)
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JAWS Feature: Internal “fins” hug the rebar/rod to prevent bounce-off during placement
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FinStand Fastening: Secure to wood deck with nails or to metal deck with #8 or #10 tek screws
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Material: Impact-resistant medical grade polypropylene (non-metallic)
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Coverage: 100 JAWS Small + 100 FinStands per box (approx. 3,000 sq ft / 278 m²)
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Rod Guidance: Use steel threaded rod for slabs over 8″ (200 mm)
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Threaded Rod / Hardware: All-thread, hex nuts, and flat washers are sold separately. Rod length is cut to slab depth (see slab depth chart).
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
- Secure FinStand to the deck (wood: nails / metal: #8 or #10 tek screws).
- Insert 1/2″-13 all-thread (sold separately), cut to the required slab depth.
- Adjust height up to 1-3/4″ (45 mm) using a nut and washer.
- Install JAWS® Small onto the rebar/rod/mounting structure (3/8″–5/8″ range).
- Place the 2x4 wood screed rail (or rail up to 1-1/2″ wide) into the JAWS “teeth.”
- Space supports every 3–4 feet and begin pouring and screeding.
For slab depth and all-thread length selection, refer to the FinStand slab depth chart in the FinStand Product Data Sheet. For slabs over 8″ (200 mm), steel threaded rod is recommended.
Why Contractors Choose This Bundle
- Everything needed for adjustable 2x4 screed rail setup (without Base Plate)
- Fast setup on wood or metal decks
- Adjustable grade control for deck variation and slope changes
- Non-conductive and non-corrosive for harsh environments
- Engineered for consistent results on super flat floors
Frequently Asked Questions
Is Base Plate 4.5 included?
No. This bundle does not include Base Plate 4.5. It is intended for direct attachment to wood or metal decks using FinStand fastening.
Do threaded rod, nuts, and washers come with this bundle?
No. Threaded rods (all-thread), hex nuts, and flat washers are sold separately. Rod length is cut to slab depth.
How far apart should I place supports?
A typical guideline is every 3–4 feet depending on screed length, rail type, and sub-grade conditions.
When should I use steel threaded rod?
For slabs thicker than 8″ (200 mm), steel threaded rod is recommended.
Does the MAKO® Driver work with JAWS® Small?
Yes. The MAKO® Driver is designed to work with JAWS® Small for faster, more consistent setup when aligning to a string line or laser finished elevation.
Recommended Add-Ons
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Nylon or Steel All-Thread (1/2″-13): Cut to length per slab depth
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Hex Nuts + Flat Washers: Required for fine-tune height adjustment
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MAKO® Driver: For faster, more consistent setup by aligning to string line or laser finished elevation
Downloads
JAWS® Small Product Data Sheet
FinStand® Product Data Sheet
