ISO 7090:2000 download free.Plain washers . chamfered – Normal series – Product grade A.
ISO 7090 specifies the characteristics of normal-series. product-grade-A plain washers chamfered at the outside diameter. In the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 5 mm to 64 mm inclusive.
Washers of hardness class 200 HV are suitable for
— bolts and screws of product grades A and B in property classes up to and including 8.8:
— nuts of product grades A and B in property classes up to and including 8:
— bolts, screws and nuts of staAnless steel of similar diernical composition;
— case-hardened thread rolling somws.
Washers of hardness class 300 HV are suitable for
— bolts and screws of product grades A and B in property classes up to and including 10.9;
— nuts of product grades A and B in property classes up to and including 10.
If dimensions other than those listed in ISO 7090 are required. they should be selected from those given I, ISO 887,
When soft material pieces are clamped, r large clearance holes in the worltpiece are used, the user should check the technical suitability of this type of washer.
2 Normative references
The following normative documents contain provisions which, through relerence in this text, constitute provisions of ISO 7090. For dated references, subsequent amendments to, a revisions of, any ot these publications do not apply. However, patties to agreements based on INs Inlernational Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents Widicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and lEG maintain registers of currentty valid International Standards.
ISO 887:2000, Plain washers let metrt bolts, screws and nuts for general purposes — General plan. ISO 3269:2000, Fasteners — Acceptance Inspection.
ISO 3506-1:1997. Aechancal properties of corrosnresIstant stainless-steel fasteners — Past i: Bofis, screws and slitS.
1S04042:1999, Fasteners — Electroplated coatlnp.
ISO 4759-3:2000. Tolerances for fasteners — Part 3: main washers kit bolts, screws and nuts — Product grades A and C.
1S06507-1:1997. Metallic materials — WIckets hardness test — Part 1: Tess method. ISO 10683—”. Fasteners — Non-electrolytically applied zinc flake coatings.
3 Dimensions
See Figure 1 and Tables 1 and 2.
5 Designation
EXAMPLE 1 A normal-series, product-grade-A, chamfered plain washer made of steel, of nominal size 8 mm and hardness class 200 HV is designated as follows:
Washer ISO 7090-8-200 HV
EXAMPLE 2 A normal series, product-grade-A, chamfered plain washer made of grade A2 stainless steel, of nominal size 8 mm and hardness class 200 HV is designated as follows:
Washer ISO 7090-8-200 HV-A2.