Hardened washer

[precast78]

Guys and gals, I am doing a R&D on a connection for a product. We are connecting an A325 1" dia bolt through a very elongated hole (1 1/16" wide). The plate has been modeled on FEA. Now I want to make sure that a standard hardened washer will work for this application. Do you guys know what the yield strength of these washers is?

 

[JAE]

AISC doesn't provide the yield strength of F436 washers in the steel manual.

The RCSC Specification does suggest using F436 or a min. 5/16" common plate washer in snug tightened slotted connections.

For pretensioned joints or slip-critical joints with slotted holes they require a 5/16" plate washer instead of the F436 washers. They also require here that the plate completely cover the hole.

(see Section 6.2.5 of the Specification for Structural Joints Using High Strength Bolts.)...found here

 

[JAE]

There's also some info in Table 14-2 of the AISC Steel Manual that talks about washer requirements in oversized holes (i.e for column base plates and anchor rods) but this may not apply to your situation.

 

[bridgebuster]

ASTM F-436 doesn't identify a yield strength. It gives mechanical properties based on hardness.

6. Mechanical Properties

6.1 Through hardened washers shall have a hardness of 38 to 45 HRC, except when zinc-coated by the hot-dip process, in
which case they shall have a hardness of 26 to 45 HRC.

6.2 Carburized washers shall be carburized to a minimumdepth of 0.015 in. and shall have a surface hardness of 69 to 73
HRA or 79 to 83 HR15N, except when zinc-coated by the hot-dip process, in which case they shall have a hardness of 63
to 73 HRA or 73 to 83 HR15N.

6.3 Carburized and hardened washers shall have a minimum
core hardness of 30 HRC or 65 HRA

 

[Bagman2524]

I don't even see any carbon in the Chemical Requirements. Phosphorus, Sulfur, Silicon, Chromium, Nickel and Copper are all low quantities. 0.5% or less

"Look for 3 things in a person intelligence, energy and integrity. If they don't have the last one, don't even bother with the first 2. W. Buffet