12 Point Flange Bolts - (SAE) Fine
12 point flange bolts in SAE fine thread: 1/4-28, 5/16-24, 3/8-24, 1/2-20 and 5/8-18, from 3/4" to 2-1/2" long. 170,000 psi high tensile alloy steel with a thermal black and oil finish. Choose a size below.
Specifications
- Head: 12 point with flange
- Material: high tensile alloy steel, 170,000 psi min. tensile
- Thread: SAE fine (UNF)
- Sizes: 1/4-28, 5/16-24, 3/8-24, 1/2-20, 5/8-18
- Finish: thermal black with oil
Common Uses
- Racing and performance engines
- Machinery
- Tight spaces and counterbored holes
FAQ
Why a 12 point head?
A 12 point head is smaller than a hex head for the same bolt, so it fits tight spaces and counterbores, and the 12 points let a wrench grip from more angles. Use a 12 point socket.
What do USS coarse and SAE fine thread mean?
USS (UNC) coarse thread has fewer threads per inch and is the general purpose standard; it assembles fast and is less likely to cross thread. SAE (UNF) fine thread has more threads per inch, which gives a little more strength and finer adjustment, and is common on vehicles and machinery. The nut must match the thread.
Related: 12 Point Flange Bolts Coarse | Grade 8 Fine Thread Cap Screws | Grade 8 Hex Nuts
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