Metallics JG8SW881 Washers 1" Grade 8 Flat SAE St-zn (Jar 100)

It is a 1 inch SAE flat washer, so it pairs with 1 inch diameter bolts, studs, and anchor rod. SAE pattern means a smaller outside diameter and smaller hole than a USS washer of the same nominal size, so it bears tighter against the bolt head or nut rather than spreading load over a wide area. If you need the wider footprint for soft material or an oversized hole, specify a 1 inch USS washer instead.

Grade 8 matters when the fastener is Grade 8 or better. Under high clamp load a standard low carbon washer can dish or embed, letting the joint lose torque. The JG8SW881 is a hardened Grade 8 steel washer, so it holds its shape under 1 inch Grade 8 bolt loads on structural steel, strut, machine mounts and heavy equipment anchoring.

Zinc plated steel. The zinc gives basic corrosion resistance for indoor work, damp mechanical rooms and covered exterior locations. For direct weather exposure, coastal sites or anywhere in contact with treated lumber, a hot dip galvanized or stainless washer is the better call.

One hundred washers per jar, packaged in a jar rather than a bag or box, which is why it stacks on a shelf and reseals on the truck. The jar runs about 7.25 by 6.75 by 3.25 inches and weighs 9.21 lbs, so plan for the weight if you are ordering several for a gang box or service van.

They do different jobs. The JG8SW881 flat washer spreads load and protects the mating surface from the turning nut; it does nothing to resist loosening. If vibration is the concern, the flat washer goes against the material and you add a lock washer, a nylon insert lock nut, or a wedge type locking washer on top of it. Many structural connections use the hardened flat washer alone and rely on proper torque.

Yes. These are stocked as electrical fasteners and are used under 1 inch nuts and bolt heads for strut, transformer and switchgear anchoring, and heavy hanger rod hardware. Pair them with Grade 8 nuts and bolts so the whole assembly is rated to the same level.

It follows the ANSI dimensional standard for SAE flat washers, so the hole and outside diameter match what a drawing calling out a 1 inch SAE washer expects. Country of origin is China, which is the answer purchasing usually needs for submittal paperwork.