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Description
Simpson Strong-Tie STB2-50812S4F20 Strong Bolt (1/2" x 8-1/2") Fully Assembled Wedge Anchor - Type 304 (20 Pack)Simpson Strong Tie STB2 50812S4F20 Description The Simpson Strong Tie Strong Bolt 2 Wedge Anchors in 304 stainless steel deliver powerful performance and dependable holding strength for concrete anchoring projects. Simpson Strong Tie STB2 50812S4F20 Includes (20) 1 2 in. x 8 1 2 in. Type 304 Stainless Steel Wedge Anchor Simpson Strong Tie STB2 50812S4F20 Features Chamfered top designed to prevent mushrooming during installation Qualified for static
Simpson Strong-Tie STB2-50812S4F20 Description
The Simpson Strong-Tie Strong-Bolt 2 Wedge Anchors in 304 stainless steel deliver powerful performance and dependable holding strength for concrete anchoring projects.
Simpson Strong-Tie STB2-50812S4F20 Includes
- (20) 1/2 in. x 8-1/2 in. Type 304 Stainless-Steel Wedge Anchor
Simpson Strong-Tie STB2-50812S4F20 Features
- Chamfered top designed to prevent mushrooming during installation
- Qualified for static and seismic loading conditions
- Suitable for horizontal, vertical and overhead applications
- Qualified for minimum concrete thickness of 3 1/4"
- Standard (ANSI) fractional sizes
- Tested per ACI355.2 and AC193
Simpson Strong-Tie STB2-50812S4F20 Applications
- Structural steel anchoring
- Machinery anchoring
- Racking systems
- Ledger attachments
- Post bases
Simpson Strong-Tie STB2-50812S4F20 Installation Overview
- Drill a hole in the base material using a carbide drill bit the same diameter as the nominal diameter of the anchor to be installed.
- Assemble the anchor with nut and washer so the top of the nut is flush with the top of the anchor.
- Place the anchor in the fixture, and drive it into the hole until the washer and nut are tight against the fixture.
- Tighten to the required installation torque.
Simpson Strong-Tie STB2-50812S4F20 Specifications
| Diameter | 1/2 in. |
| Length | 8-1/2 in. |
| Material | 304 Stainless Steel |
| Drill bit size | 1/2 in. |
| Fixture hole size | 9/16 in. |
| Installation torque | 45 ft. lbf. |
| Thread length | 6 in. |
| Wrench size | 3/4 in. |
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4.4 ★★★★★
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Product Reviews
★★★★★ 5
Timely delivery.
Format: Paperback
I got the ordered item within the time. The book was in good shape
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2025
★★★★★ 5
Worth it
Format: Paperback
Excellent, needed for class
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Reviewed in the United States on June 11, 2021
★★★★★ 5
Another fine Piece
As with Bowlbys' other works, this classic furthers the hypothesis of negative emotional influence on the continued development of humans as we integrate with our social environments. I liked it...in fact, liked all of Bowlbys' writings.
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Reviewed in the United States on September 12, 2013
★★★★★ 5
Five Stars
A MUST HAVE BOOK FOR anyone interested in parenting! or have kids.
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Reviewed in the United States on March 20, 2015
★★★★★ 4
A Groundbreaking Classic on Young Child Development
Format: Paperback
This first volume of John Bowlby's trilogy on Attachment and Loss expands and builds upon an article he published in 1958 in the International Journal of Psycho-Analysis titled "The Nature of the Child's Tie to His Mother", which is perhaps a more telling title than that of the book itself. Attachment, as a technical term in behavioural biology, is first used in describing instinctive mother-following behaviours of young mammals and birds (first observed and reported in delightful accounts by the Austrian ethologist Konrad Lorenz in the 1930's).
By comparing data collected during and after the Second World War by childcare workers and researchers in U.K. and North America, Bowlby found a striking common pattern of distressed behaviours among young children between the ages of one and three when separated from mother for an extended period: first in Protest, then Despair and finally Detachment - a psychopathological state when a child becomes socially uninitiated and withdrawn, even to his returning mother. Bowlby then postulates that physical proximity to a mother-figure is essential to a child's development of cognitive capacities, especially during a sensitive period around six months to two years after birth. Attachment behaviours, like those of young mammals and birds, are present in the human baby too. This has since led to a blossoming of research activities in development psychology and psychoanalysis, as well as neurophysiology recently, which supplies much fresh evidence about the young brain and its phenomenal maturing in the first two years. Attachment theory has since contributed significantly to understanding of our own selves, informed the age-old philosophical debate on nature or nurture, and brought our attention to fundamental issues in child-rearing such as sensitive periods of development, the difference between attachment (conducive to security) and dependence (symptomatic of insecurity), the distinction between anxiety from separation and fear of the unfamiliar, etc.
This new edition is a timely reprint of a classic account of attachment theory as formulated by the originator. While primarily an academic work, with a few chapters deemed more for an academic jury (about Freud and instinctive behaviours, etc.), it is mostly very readable, and certainly captivating to those with access to young babies, of whose behaviours are given an enlightening perspective. This volume focuses on attachment, with subsequent volumes on its loss in temporary and permanent terms respectively.
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Reviewed in the United States on September 4, 2003