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Ground Anchor Systems
Concrete Anchor Systems
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Spin-Lock Concrete Anchor Systems

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R1H High Grade Hollow-Core Spin-Lock R1J Solid Rebar Spin-Lock
R1S High Tensile Spin-Lock B7S Coil All-Thread Spin-Lock
R1V High Impact Spin-Lock R7S 150 KSI Spin-Lock
Spin-Lock Anchor Head Assemblies Spin-Lock Torque Tension Charts
Williams Spin-Lock anchors were first used in the 1950’s for rock/roof bolting in projects such as NORAD and Australia’s Snowy Mountain Power Facility. Since then many engineers, contractors and owners have recognized the advantages of the Spin-Lock anchor system as a high capacity concrete anchor. Spin-Locks have been used successfully on rocket launch pads, nuclear power plants, large dams and spillways, tower anchors, roller coasters and several other applications requiring high capacity and dynamic load resistant concrete anchor systems. Williams Spin-Lock anchors provide the advantages of immediate anchorage, prestressing/post-tension abilities, anchorage redundancy (mechanical anchorage with a grout bond), custom manufacturing, and the highest capacities of any production mechanical anchor available today.

To comply with the need for anchors which can be used in a variety of applications with a wide range of loading capabilities…Williams has developed a complete family of concrete anchor bolts with a simple and efficient system of installation. Williams also offers a line of rental equipment for installing, testing and grouting of Spin-Lock high capacity concrete anchors.

Before proceeding with your next project, consult with a design agency familiar with Williams anchor systems, or contact your nearest Williams representative. Williams would be pleased to recommend an ideal system to meet the needs of your next application.

Spin-Lock Advantages
  • The mechanical head allows for a prestressed anchor which prevents anchor fatigue
    failure in cyclic or dynamic loading applications.
  • Anchors can be custom manufactured or mechanically coupled to any length.
  • Each anchor is tested to the desired working load.
  • Anchors are grouted providing redundant anchorage, corrosion protection and the grout
    helps to lock in prestress values.
  • The mechanical head provides a full 300˚ bearing area and opens parallel to the drill hole, avoiding point loading.
  • Anchors can be designed continuously threaded for field adaptation.
  • Williams has testing equipment and personal that can work with an engineer for designs with unique applications, locations or patterns.
  • A selection of anchor bars is available to fit nearly every design.
  • Williams Form can recommend several installation contractors in the area of the anchor
    installation.
  • High degree of dependability allows for a 2:1 safety factor.
  • The Spin-Lock has been used in construction for over 50 years.
Williams Spin-Lock Anchor Serrated Anchor by others
Williams Spin-Lock Mechanical Concrete Anchor Expansion shell receives full bearing support from solid 300° cone design. Serrated Concrete Anchor Quartered cone design leaves expansion shell unsupported at adjacent gaps. Shell can collapse in under high stress.
Methods of Concrete Anchoring
Method A
Anchor is pre-stressed to rock and used in thin slab locations.
Method B
Less expensive method. Used where pre-stressed rock is anchored to large slabs or footings.
Method C
Exposed nut and plate where slab is pre-stressed to rock.
Method D
Non-exposed nut and plate where pre-stressed slab is required to have flush anchor.
Williams Form Engineering Corp.
Spin-Lock
Information
Spin-Lock
Design
Parts &
Accessories
Head
Assemblies
Spin-Lock Installation
Installation
Equipment
Case
Histories
Corrosion
Protection
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