Manufactured to GB/T 97.1 / ISO 7089, General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) are washers supplied by Engineering Hardware. The dimensional data, materials and selection notes are summarized here.
What Are General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087)?
General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) are washers defined by GB/T 97.1 / ISO 7089. They are selected by nominal bolt size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.
CAD Source Reference
This page is generated from an original native CAD part model (SolidWorks .SLDPRT) of the general flat washer — gb/t 97.1 / iso 7089 (series 087) family maintained by our engineering team, covering 18 recorded size configurations. The technical drawing shown above is rebuilt parametrically from the dimensional table, so it always reflects the exact size and configuration you select. Native CAD files (STEP / SLDPRT) can be supplied with your quotation on request.
Materials & Finishes
Common materials include carbon steel (typically zinc plated or hot-dip galvanized), hardened or case-hardened steel where wear matters, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, hardness where relevant, and the surface finish appropriate to your application and environment.
Typical Applications
Load distribution, surface protection and anti-loosening under bolt and nut heads in virtually all bolted joints. Read the full application guide for General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) →
Pricing
General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) are supplied to order. Pricing starts from approximately US$0.010 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
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01 Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
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02 Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
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03 Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
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04 Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.