SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer

SAE flat washer manufactured to ASME B18.22.1 is a precision fastening component widely used in North American bolt assemblies. Available in carbon steel and stainless steel grades, this SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer distributes clamping load evenly, prevents surface damage and helps reduce loosening under vibration. It is designed for perfect matching with UNC / UNF bolts and nuts, and should not be confused with USS washers which have different dimensions.

What Is an SAE Flat Washer

An SAE flat washer is a thin ring placed between a bolt head or nut and the workpiece surface. It enlarges the bearing area so the clamping pressure is spread over a wider zone, reducing surface indentation and stress concentration. Compared with ordinary washers, the SAE series features controlled inner diameter, outer diameter and thickness, ensuring stable and repeatable fit in precision assemblies. Our SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer strictly follows the dimension tolerance defined in ASME B18.22.1 for consistent performance batch after batch.

Standard Comparison Chart

Item	SAE Washer (B18.22.1)	USS Washer (B18.21.1)
Outside Diameter	Small, compact	Large, wider
Thickness	Thin, light duty	Thick, heavy duty
Best For	Compact & light assembly	Heavy structural load
Size Range	#2 ~ 1"	#2 ~ 1-1/2"

Our SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer follows ASME B18.22.1 with a compact outer diameter, making it the first choice for space-limited and lighter-load assemblies. Meanwhile the USS flat washer per ASME B18.21.1 features a larger OD and thicker body for heavy structural applications. Both carbon steel and stainless steel versions are available, with plain, zinc-plated and hot-dip galvanized finishes to suit your project.

Material & Finish Chart

Material	Application	Available Finish	Corrosion
Low Carbon Steel	Indoor machinery, structure	Plain, Zinc, Black Oxide, HDG	Coating needed outdoors
304 Stainless Steel	Outdoor, marine, food	Bright, Passivated	Good
316 Stainless Steel	Coastal, chemical	Bright, Passivated	Excellent

Size Selection Guide

To choose the correct SAE flat washer, first confirm the nominal diameter of your bolt or screw, then match the washer inner diameter accordingly. The washer OD and thickness are then decided by the load and available space. For light assemblies prefer the compact SAE type; for heavy structures select a larger or USS washer. When in doubt, provide your bolt size and working load, and we will recommend the proper dimension of SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer.

Key Features

- Strictly manufactured per ASME B18.22.1 dimension requirements, compatible with UNC / UNF fasteners

- Dual material options: Carbon Steel and Stainless Steel to adapt to different working environments

- Deburred, burr-free, uniform thickness for stable load distribution

- Multiple surface treatments available; full SAE size range kept in stock for fast shipment

- Compact OD design, great for limited-space assembly compared with USS washers

Manufacturing & Quality Control

Every SAE flat washer is produced with cold forming and precise stamping, followed by deburring to ensure clean edges. Our quality team checks inner diameter, outer diameter and thickness with calibrated gauges against ASME B18.22.1 tolerance. Samples are dimensionally inspected before bulk production, and batch inspection records can be provided upon request to support your incoming inspection of SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer.

Packaging & Delivery

Standard packaging is carton + pallet, with anti-rust treatment for stainless steel finish and protective coating for carbon steel versions. Small orders ship quickly from stock; large container orders are consolidated and loaded efficiently. We support custom packing such as small bags, box labels and mixed sizes per your instruction for SAE Flat Washer ASME B18.22.1 Carbon Steel Stainless Steel Washer.

FAQ

Q1: What is the difference between SAE flat washer and USS flat washer?

A: SAE washers (ASME B18.22.1) have smaller outer diameter and thinner thickness, designed for compact and light-load UNC/UNF assemblies. USS washers (ASME B18.21.1) feature larger OD and thicker body, used for heavy structural load applications.

Q2: What material and surface finishes are available for your SAE flat washers?

A: We supply low carbon steel, 304 stainless steel and 316 stainless steel. Available finishes include plain, zinc plated, black oxide and hot-dip galvanized.

Q3: Are these SAE flat washers fully compliant with ASME B18.22.1?

A: Yes. All our SAE flat washers are stamped and inspected strictly per ASME B18.22.1 dimension tolerances, compatible with UNC and UNF fasteners. Batch inspection records can be provided upon request.

Q4: Can I get mixed sizes or custom packaging for SAE flat washers?

A: Yes. We support mixed-size packing, small polybag packaging and custom box labels. Stock sizes are available for fast delivery for small orders.