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425 427

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Shelf-Angle Wedge Inserts (425)

Part Number: 425

When cast into concrete, Shelf Angle Wedge Inserts and Askew Head Bolts provide a secure and adjustable method for fastening shelf angles and other materials to concrete structures. The inserts allow vertical adjustment so veneers can be properly aligned despite construction tolerances in the building frame.

For 3/4" Bolts only. Malleable Iron Inserts Hot Dip Galvanized

Two Sizes:
Regular: Overall Height 3-7/8" with 1-3/4" vertical adjustment
Long: Overall Height 5-1/2" with 3" vertical adjustment

See product 427 Askew Head Bolts for the bolts.

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Features and Benefits

Heavy-duty malleable iron insert

For fastening shelf angles to concrete structures

To be used with #427 Askew Head Bolts

Inserts allow vertical adjustments


Hot-dip galvanized after fabrication

#425 Shelf Angle Wedge Insert

#427 Askew Head Bolts 

Inserts are embedded in concrete slabs to hold Shelf Angles or other devices using #427 Askew Head Bolts. The insert is nailed to the wood form through 3 holes. When the form is stripped, the nails are clipped from the outside allowing the #427 bolt to vertically adjust to the proper location. #442 or #443 shims can be used if necessary. The #425 Shelf Angle must be installed at least 1-1/2” from any edge on the concrete slab.

Note: $200 minimum total per order

427 bolt with nut and washer

¾” diameter - Hotdip Galvanized After Fabrication 

Material Specifications 

Malleable Iron Specifications: ASTM A47B4 Ferratic Malleable Iron Castings Class/Grade 32510   

Min Tensile Strength - PSI 50,000   

Min. Yield Strength - psi  32,500   

Elongation in tension 10% Microstructure is Temper carbon and ferrite

For additional information on Specifications of Shelf Angle Inserts refer to the following: ASME B18.2.1-2010 - Askew Head Bolts - American National Standards Institute.

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