--- title: Anchor Bolt Bending description: Improper bending methods reduce strength of Anchor Bolts. image: https://www.thesteelsupplyco.com/hs-fs/file-172784-jpg/images/anchor_bolt_-_improper_bend_3.jpg --- [![Providing Structural and Miscellaneous Steel Fabricators](https://www.thesteelsupplyco.com/hs-fs/file-14727826-jpg/images/bannerfixed-webrdy.jpg?width=750&name=bannerfixed-webrdy.jpg "Providing Structural and Miscellaneous Steel Fabricators")](https://www.thesteelsupplyco.com/) - [![the steel supply company](https://www.thesteelsupplyco.com/hs-fs/hubfs/logo-1.jpg?width=88&name=logo-1.jpg "the steel supply company")](https://www.thesteelsupplyco.com/) - [![The Steel Supply Co, Inc](https://www.thesteelsupplyco.com/hubfs/top-text-new.png)](https://www.thesteelsupplyco.com/) - [![Specialized Supplies for Structural and Miscellaneous Steel Fabricators](https://www.thesteelsupplyco.com/hubfs/bottom-text-new.png)](https://www.thesteelsupplyco.com/) ![BLOG TheSteelSupplyCo banner950x250](https://www.thesteelsupplyco.com/hs-fs/file-730735349-jpg/images/blog_thesteelsupplyco_banner950x250.jpg?width=760&name=blog_thesteelsupplyco_banner950x250.jpg) ## Steel Manufacturing Blog: Keeping it Steel # Anchor Bolt Bending Posted on Tue, Apr 24, 2012 @ 02:45 PM - [Tweet](https://twitter.com/share) Often overlooked, this is a critical point in the process of manufacturing [Anchor Bolts](https://www.thesteelsupplyco.com/anchor-bolts/anchor-bolts/). We’ve seen many examples of bolts bent on the wrong equipment. Press brakes or some other system that creates one or both of the follow problems; **Problem # 1 The bend is focused on a small spot on the inside radius.** **![Anchor Bolt Improper Bend](https://www.thesteelsupplyco.com/hs-fs/file-172784-jpg/images/anchor_bolt_-_improper_bend_3.jpg?width=346&height=112&name=anchor_bolt_-_improper_bend_3.jpg)** When bent on a press brake, the tool often leaves a dent at the spot where the downward force was applied. Once installed, any upward pressure would create stress, all of which would focus on that dent. (figure 1)   ![Anchor Bolt Mandrel Bend](https://www.thesteelsupplyco.com/hs-fs/file-14724854-jpg/images/anchor_bolt_-_mandrel_bend_copy.jpg?width=348&height=113&name=anchor_bolt_-_mandrel_bend_copy.jpg) Bent around the proper size mandrel, at the proper speed, the result would be an even radius. Under the same upward pressure the stress is distributed over the full inside radius of the bend. (figure 2)   **Problem # 2 The bend radius is too tight and the steel on the outside is stretched too thin.** The inside radius of a [bent anchor bolt](https://www.thesteelsupplyco.com/hooked-anchor-bolts/) should never be less than the diameter of the round bar prior to bending. Bending on too tight a radius causes the outer diameter to stretch too thin and reduces the diameter too much. [Specification ASTM 1554-07a](http://www.astm.org/Standards/F1554.htm) reads, “The bend section of bent anchor bolts shall have a cross-sectional area not less than 90% of the straight portions.”   [Click for chart](https://www.thesteelsupplyco.com/hs-fs/file-2941575027-pdf/docs/bentrodanchor-flyer.pdf) Tags: [Bent Anchor Bolts](https://www.thesteelsupplyco.com/blog/topic/bent-anchor-bolts) ### Subscribe by Email ### Follow Me ### Most Popular Posts ### Browse by Tag - [Aluminum Plug (2)](https://www.thesteelsupplyco.com/blog/topic/aluminum-plug) - [Anchor Bolts (16)](https://www.thesteelsupplyco.com/blog/topic/anchor-bolts) - [Askew Head Bolts (6)](https://www.thesteelsupplyco.com/blog/topic/askew-head-bolts) - [Bearings (11)](https://www.thesteelsupplyco.com/blog/topic/bearings) - [Bent Anchor Bolts (4)](https://www.thesteelsupplyco.com/blog/topic/bent-anchor-bolts) - [Channel Slot (2)](https://www.thesteelsupplyco.com/blog/topic/channel-slot) - [Clevis (2)](https://www.thesteelsupplyco.com/blog/topic/clevis) - [Clevis Rods (4)](https://www.thesteelsupplyco.com/blog/topic/clevis-rods) - [Construction Shims (3)](https://www.thesteelsupplyco.com/blog/topic/construction-shims) - [Cut Thread (2)](https://www.thesteelsupplyco.com/blog/topic/cut-thread) - [EZ Sleeve (5)](https://www.thesteelsupplyco.com/blog/topic/ez-sleeve) - [F1554 (1)](https://www.thesteelsupplyco.com/blog/topic/f1554) - [Fluorogold Slide Bearing (4)](https://www.thesteelsupplyco.com/blog/topic/fluorogold-slide-bearing) - [Fluoroloc Slide Bearing (1)](https://www.thesteelsupplyco.com/blog/topic/fluoroloc-slide-bearing) - [Galvanized Anchor Bolts (2)](https://www.thesteelsupplyco.com/blog/topic/galvanized-anchor-bolts) - [Galvanized Vent Hole Plug (5)](https://www.thesteelsupplyco.com/blog/topic/galvanized-vent-hole-plug) - [Galvanized Vent Plug (3)](https://www.thesteelsupplyco.com/blog/topic/galvanized-vent-plug) - [Galvanized Weep Hole Plug (2)](https://www.thesteelsupplyco.com/blog/topic/galvanized-weep-hole-plug) - [Hanger Rods (2)](https://www.thesteelsupplyco.com/blog/topic/hanger-rods) - [hex nuts (1)](https://www.thesteelsupplyco.com/blog/topic/hex-nuts) - [Hillside Washers (4)](https://www.thesteelsupplyco.com/blog/topic/hillside-washers) - [Hot Dip Galvanizing (6)](https://www.thesteelsupplyco.com/blog/topic/hot-dip-galvanizing) - [I-Beam (2)](https://www.thesteelsupplyco.com/blog/topic/i-beam) - [Industrial Maintenance (2)](https://www.thesteelsupplyco.com/blog/topic/industrial-maintenance) - [Lintel (1)](https://www.thesteelsupplyco.com/blog/topic/lintel) - [Malleable Iron Insert (1)](https://www.thesteelsupplyco.com/blog/topic/malleable-iron-insert) - [Markers (2)](https://www.thesteelsupplyco.com/blog/topic/markers) - [Maskote Zinc Stop-Off (2)](https://www.thesteelsupplyco.com/blog/topic/maskote-zinc-stop-off) - [Masonry Anchors (8)](https://www.thesteelsupplyco.com/blog/topic/masonry-anchors) - [Plastic Shims (3)](https://www.thesteelsupplyco.com/blog/topic/plastic-shims) - [Rebar Anchor (6)](https://www.thesteelsupplyco.com/blog/topic/rebar-anchor) - [rebar anchors (1)](https://www.thesteelsupplyco.com/blog/topic/rebar-anchors) - [Rebar Coupler (6)](https://www.thesteelsupplyco.com/blog/topic/rebar-coupler) - [Relieving Angle (2)](https://www.thesteelsupplyco.com/blog/topic/relieving-angle) - [Relieving Angle Insert (2)](https://www.thesteelsupplyco.com/blog/topic/relieving-angle-insert) - [S-1 supplement (2)](https://www.thesteelsupplyco.com/blog/topic/s-1-supplement) - [Sag Rods (1)](https://www.thesteelsupplyco.com/blog/topic/sag-rods) - [Shelf Angle (2)](https://www.thesteelsupplyco.com/blog/topic/shelf-angle) - [Shelf Angle Insert (2)](https://www.thesteelsupplyco.com/blog/topic/shelf-angle-insert) - [Shims (13)](https://www.thesteelsupplyco.com/blog/topic/shims) - [Slide Bearing (7)](https://www.thesteelsupplyco.com/blog/topic/slide-bearing) - [Slide Bearings (15)](https://www.thesteelsupplyco.com/blog/topic/slide-bearings) - [Slotted Channel (3)](https://www.thesteelsupplyco.com/blog/topic/slotted-channel) - [Slotted Shims (2)](https://www.thesteelsupplyco.com/blog/topic/slotted-shims) - [Slotted Steel Shims (2)](https://www.thesteelsupplyco.com/blog/topic/slotted-steel-shims) - [Steel Coatings (2)](https://www.thesteelsupplyco.com/blog/topic/steel-coatings) - [Steel Primer (2)](https://www.thesteelsupplyco.com/blog/topic/steel-primer) - [Steel Shims (12)](https://www.thesteelsupplyco.com/blog/topic/steel-shims) - [STEEL SUPPLY (5)](https://www.thesteelsupplyco.com/blog/topic/steel-supply) - [Steel Wedge (7)](https://www.thesteelsupplyco.com/blog/topic/steel-wedge) - [Steel Wedges (10)](https://www.thesteelsupplyco.com/blog/topic/steel-wedges) - [Steel Wedges Made To Order (7)](https://www.thesteelsupplyco.com/blog/topic/steel-wedges-made-to-order) - [Teflon Slide Bearing (10)](https://www.thesteelsupplyco.com/blog/topic/teflon-slide-bearing) - [Teflon Thermal Breaks (1)](https://www.thesteelsupplyco.com/blog/topic/teflon-thermal-breaks) - [Thermal Break (3)](https://www.thesteelsupplyco.com/blog/topic/thermal-break) - [Threaded Rod (1)](https://www.thesteelsupplyco.com/blog/topic/threaded-rod) - [Threaded Steel (3)](https://www.thesteelsupplyco.com/blog/topic/threaded-steel) - [Turnbuckle Rods (7)](https://www.thesteelsupplyco.com/blog/topic/turnbuckle-rods) - [Turnbuckles (3)](https://www.thesteelsupplyco.com/blog/topic/turnbuckles) - [Vent Hole Plug (3)](https://www.thesteelsupplyco.com/blog/topic/vent-hole-plug) - [Vent Hole Plugs (1)](https://www.thesteelsupplyco.com/blog/topic/vent-hole-plugs) - [Wedge Insert (4)](https://www.thesteelsupplyco.com/blog/topic/wedge-insert) - [Wedge Inserts (8)](https://www.thesteelsupplyco.com/blog/topic/wedge-inserts) - [Wedges (10)](https://www.thesteelsupplyco.com/blog/topic/wedges) © 2015 The Steel Supply Company, Inc. * Office: 35 Pine Drive, Cold Spring Harbor, NY 11724 * Warehouse and Factory: 109 Kean Street, West Babylon, NY 11704 * Phone 631-385-7273 * Fax 631-385-7274 info@thesteelsupplyco.com