ISO 7091:2000 download free.Plain washers-Normal series-Product grade C.
1 Scope
ISO 7091 specifies the characteristics of normal•series, product-grade-C plain washers in the
100 HV hardness class and of nominal sizes (nominal thread diameters) ranging from 1,6 mm to 64 mm inclusive.
Washers of hardness class 100 HV are suitab’e for
hexagon bolts and screws of product grade C in property classes up to and including 6.8;
— hexagon nuts of product grade C in property classes up to and including 6:
— case-hardened thread rolling screws.
If dimensions other than those listed in ISO 7091 are required, they should be selected from those given in ISO 887.
When soft material pieces are clamped, or large clearance holes in the workpiece 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 reference in this text, constitute provisions of ISO 7091. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on ISO 7091 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 887:2000, Plain washers for metric bolts, screws arid nuts for general purposes — General plan.
ISO 3269:2000, Fasteners — Acceptance inspection.
ISO 4042:1999, Fasteners — Electroplated coatings.
ISO 4759-3:2000, Tolerances for fasteners — Part 3: Plain washers (or bolts, screws and nuts — Product grades A and C.
ISO 6507-1:1997, Metallic materials — Vickers hardness test — Part 1: Test method. ISO 1 0683_i), Fasteners — Non-electrolytically applied zinc flake coatings.
3 Dimensions
See Figure 1 and Tables 1 and 2.
4 Requirements and International Standards of reference
See Table 3
5 Designation
EXAMPLE A normal-series. product-grade-C plain washer made of steel, of nominal size 8 mm and hardness class 100 HV is designated as follows:
Washer ISO 7091-8-100 HV.