Washers
Types of Washers
Flat Washer
Spring-Lock Washer
Tooth Lock Washer
Square Washer
F436 Washer
Conical Washer
Safety Lock Washer
Wedge Lock Washer
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Guide 1
What are the Washers?
A Washer is a part of having a centrally located hole. The washer performs various functions when assembled between the bearing surface of a fastener and the part being attached.
Guide 2
Parts Name of the Washer
Inner Diameter(d1): The Inner Diameter(ID) is the diameter of the inside of a tube, pipe, or any other object.
Outside Diameter(d2): The Outside diameter(OD) is that linear measurement taken on the cylinder and or sphere of solid mass between exactly opposite points on the convex surface across the diameter.
Thickness(h): the distance between the top and bottom or front and back surfaces of something
Guide 3
Washer Material
Plain and Fender washers shall be made of low carbon steel, stainless steel, non-ferrous metal, plastic, or other material as specified by the purchaser. Material or lot traceability is not required for unhardened steel washers identified as low-carbon steel that is often manufactured from scrap materials.
Hardened plain washers shall conform to the chemical and mechanical requirements in ASTM F 436.
Low Carbon Steel: Low Carbon Steel generally contains less than 0.25% carbon. It has outstanding ductility and toughness, is easily machined and welded, and is relatively inexpensive to produce. It has a tensile strength of between 60,000 psi to 80,000 psi. (410 Mpa to 550 Mpa).
SAE Grade 2 (Metric class 4.6, 4.8 & 5.8) fasteners are generally made out of low carbon steel with AISI grades 1006, 1010, 1016, 1018, 1022 & 1035 falling into this category.
Guide 4
Designation of the Washer
INCH FASTENERS
Washers shall be designated by the following data in the sequence shown:
(a) product name and type
(b) ASME document number (ASME B18.21.1)
(c) nominal size (number, fraction, or decimal equivalent)
(d) basic washer inside diameter
(e) basic washer outside diameter
(f) basic washer thickness
(g) material (include alloy or UNS number if required)
(h) surface protective finish standard number and
thickness, if applicable
See the following examples:
EXAMPLES:
(1) Plain Washer, Type A, ASME B18.21.1, 3/8 N, 0.406×0.812×0.065, 302 Stainless Steel, Passivation per ASTM A 380.
METRIC FASTENERS
Washers shall be designated by the following data in the sequence shown:
(a) product name and type
(b) DIN/ISO/NFE document number
(c) nominal size
(d) basic washer inside diameter
(e) basic washer outside diameter
(f) basic washer thickness
(g) material
(h) surface protective finish standard number and
thickness, if applicable
See the following examples:
EXAMPLES:
(1) Washer ISO 7089-8-200 HV – ZP per ISO 4042 A2F
Guide 5
Inspection of Washers
Vernier Caliper
Will use vernier calipers to measure the basic dimensions of washers, like ID, OD, thickness and so on.
Vickers Hardness Tester
Will use vickers hardness tester(HV) to test the hardness of metric washers.
Rockwell Hardness Tester
Will use rockwell hardness tester(HRC) to measure the hardness of inch washers.
Coating Thickness Gauge
Will use coating thickness gauge to measuere the thickness of the coating layer, such as ZP and HDG.
Guide 6
Packaging of Washers
Usual Packaging
Label: black text on white, no pattern and barcode
Carton: standard double corrugated neutral carton, bulking packing, maximum load bearing: 25kg per carton
Pallet: Europe Fumigation Pallet, 36 cartons per pallets, Width 800mm x Length 1200mm
Guide 7
Production Time of Washers
Flow 01: Need 3 Days – Analyze Customers’ PO and Place Orders to the Factory
Flow 02: Need 10 Days – Purchase the Raw Material
Flow 03: Need 15 Days – Make Production Plan and Wait for Starting Production
Flow 04: Need 15 Days – Formal Mass Production
Flow 05: Need 7 Days – Send Out to Do Heat Treatment (if exist)
Flow 06: Need 7 Days – Send Out to Do Surface Treatment (Finish)
Flow 07: Need 7 Days – Packaging, Make the Shipment
Total Time: 60 Days to 70 Days
Guide 8
Inquiry Required Content
Let us know who you are, and we can contact you in time.
We will give you a more reasonable price.
Let us know your needed product well.
Let us know if the products need to do the heat treatment.
Zinc Electoplated or Hot Dip Galvanized Coating or Zinc Flake Coating…
Our MOQ is about 1 pallet (900KGS) per size.
If it is a customized package, we will send the carton/label to you by courier for confirmation before packaging.
We will make a more suitable production plan for you.
FOB (We usually quote based on FOB ), CIF, FCA
This information is important before mass production. We will adjust the production plan according to your requirement.