SIST EN ISO 8734:2001

SIST EN ISO 8734:2001 is the Slovenian standard for parallel pins of hardened steel and martensitic stainless steel, identical to EN ISO 8734:1997. It specifies the dimensions, material condition, surface condition and designation of dowel pins with nominal diameters from 1 mm to 20 mm. Designers, buyers, manufacturers and inspectors use it to describe and check these pins in a consistent way.

What does SIST EN ISO 8734:2001 specify?

SIST EN ISO 8734:2001 specifies the characteristics of parallel pins, also called dowel pins, made of steel that is through hardened or case hardened, and of martensitic stainless steel. The standard is organized into clauses on scope, normative references, dimensions, requirements and designation, supported by one figure and two tables.

Clause 3 and Table 1 cover the pin dimensions. Clause 4 and Table 2 set the material, hardness, surface and workmanship requirements. Clause 5 gives the designation system and examples.

What are the key requirements of SIST EN ISO 8734:2001?

SIST EN ISO 8734:2001 is mainly a dimension and material standard. The key points are the size range, the material options, the surface condition and the way the pins are designated for ordering.

• Clause 3 and Table 1 define the size range. The standard covers nominal diameters from 1 mm to 20 mm and gives the related dimensional limits, including the diameter tolerance class and the range of commercial lengths. In practice, this tells the user what sizes can be specified and what fits the pin should meet.
• Table 1 also allows agreed tolerances for special cases. Other tolerances can be agreed between customer and supplier, and lengths above 100 mm are handled in larger steps. This matters when a design needs a non-standard length or a tighter supply agreement.
• Clause 4 and Table 2 define the material options. The pins may be made from steel or from martensitic stainless steel, with the stainless steel grade C1 in accordance with ISO 3506-1. In practice, the buyer has to choose the material family that matches strength, corrosion resistance and application conditions.
• Table 2 sets the material condition and hardness requirements. The steel versions are specified as through hardened or case hardened, and the table gives hardness requirements for each material type. This matters because heat treatment affects load-bearing behavior and wear resistance.
• Clause 4 controls surface condition and coating. The pins are supplied plain in natural finish with a protective lubricant unless otherwise agreed, and if they are electroplated or coated they need treatment to reduce hydrogen embrittlement. In practice, coating choice affects both size control and the risk of brittle failure.
• Clause 4 requires proper finish and workmanship. The surface roughness is limited, the pins must be free of irregularities and detrimental defects, and no burrs are allowed. This matters because rough or damaged pins can hinder assembly and damage mating parts.
• Clause 4 points to ISO 3269 for acceptability. Acceptance inspection is handled by ISO 3269. That gives purchasers and inspectors a separate basis for deciding whether a delivered batch is acceptable.
• Clause 5 standardizes designation. The designation combines the standard number, nominal diameter, nominal length, material/type and grade where relevant. This makes ordering and identification simpler and reduces ambiguity between supplier and buyer.

What terms does SIST EN ISO 8734:2001 define?

• Parallel pin (dowel pin): The pin type covered by the standard, specified here by its dimensions, material and finish.
• Through hardened: A steel pin hardened through its section and tempered to the hardness range given in Table 2.
• Case hardened: A pin hardened at the surface with a hardened case, with the case depth and hardness requirements given in Table 2.
• Martensitic stainless steel: The stainless steel material family used here, with grade C1 taken from ISO 3506-1.
• C1: The martensitic stainless steel grade referenced by the standard for one of the permitted material options.
• ISO 3269: The acceptance inspection standard used for checking whether pins meet the acceptance procedure.
• ISO 4042: The standard referenced for electroplated coatings on fasteners, relevant when coating these pins.

Who uses SIST EN ISO 8734:2001?

SIST EN ISO 8734:2001 is used by pin and fastener manufacturers, mechanical suppliers, purchasers, quality departments and inspectors. It is useful whenever a project needs parallel pins with a defined diameter, length, material condition and finish. In practice, it supports product specification, incoming inspection, purchasing descriptions and conformity checks.

What changed in SIST EN ISO 8734:2001 from the previous edition?

SIST EN ISO 8734:2001 is the second edition of ISO 8734 and it cancels and replaces ISO 8734:1987. The standard states that this edition is technically revised.

Which standards are used with SIST EN ISO 8734:2001?

• ISO 3269:1988 - provides the acceptance inspection procedure used for acceptability.
• ISO 3506-1:1997 - provides the martensitic stainless steel grade C1 referenced for one of the material options.
• ISO 4042:– - provides guidance for electroplated coatings on fasteners, including treatment related to hydrogen embrittlement.

What does the SIST EN ISO 8734:2001 document contain?

The document contains one figure showing the pin form, Table 1 with dimensions, and Table 2 with material, hardness, surface and workmanship requirements. It also contains the designation clause with worked examples for a through hardened steel pin and a martensitic stainless steel pin. These parts are used for design, ordering, manufacturing and inspection of dowel pins.