EN ISO 8735:1997

Parallel pins with internal thread, of hardened steel or martensitic stainless steel (ISO 8735:1997)

Zylinderstifte mit Innengewinde aus gehärtetem Stahl und martensitischem nichtrostendem Stahl (ISO 8735:1997)

Diese Internationale Norm beschreibt die Eigenschaften von Zylinderstiften mit Innengewinde aus Stahl, durchgehärtet oder einsatzgehärtet oder aus martensitischem nichtrostendem Stahl, mit Nenndurchmessern d1 von 6 mm bis einschließlich 50 mm.

Goupilles cylindriques à trou taraudé en acier trempé et en acier inoxydable martensitique (ISO 8735:1997)

La présente Norme internationale prescrit les caractéristiques des goupilles cylindriques à trou taraudé, trempées à coeur ou cémentées et en acier inoxydable martensitique, de diamètre nominal, d1, de 6 mm à 50 mm inclus.

Valjasti zatiči z notranjim navojem, kaljeni ali iz martenzitnega nerjavnega jekla (ISO 8735:1997)

General Information

• Status: Published
• Publication Date: 14-Nov-1997
• ICS: 21.060 - Fasteners
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Drafting Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 04-Feb-2008
• Completion Date: 04-Feb-2008
• Ref Project: SIST EN ISO 8735:2001 - Parallel pins with internal thread, of hardened steel or martensitic stainless steel (ISO 8735:1997)

Overview

EN ISO 8735:1997 specifies the standards for parallel pins with internal threads made from hardened steel or martensitic stainless steel. This international standard, issued by the International Organization for Standardization (ISO) and adopted by CEN, defines the dimensions, materials, mechanical properties, and surface conditions for precision-engineered parallel pins used primarily in fastening and positioning applications.

These pins ensure reliable mechanical connections and accurate alignment in engineering assemblies, benefiting manufacturing sectors that demand high precision and durability, such as automotive, aerospace, and machinery industries.

Key Topics

• Material Specifications

  • Hardened steel (through-hardened or case hardened) and martensitic stainless steel
  • Chemical composition limits specific to each material type
  • Hardness requirements: 460 HV30 to 650 HV30, depending on pin type and treatment
  • Surface finish typically supplied plain with protective lubricant; options exist for surface coatings with attention to avoiding hydrogen embrittlement

• Dimensional Requirements

  • Nominal diameters ranging from 6 mm up to 50 mm
  • Lengths and thread pitch designed according to ISO 965-2 metric screw thread standards
  • Two main types:
    • Type A: Pins with crown, typically through hardened
    • Type B: Flat pins, typically case hardened

• Thread and Surface Tolerances

  • Metric screw thread tolerance 6H specified
  • Surface roughness Ra < 0.8 µm to ensure smooth, defect-free surfaces
  • Strict quality control in manufacturer processes to eliminate burrs and irregularities

• Testing and Acceptance

  • Compliance testing performed according to ISO 3269 acceptance inspection standards
  • Verification of mechanical properties, dimensions, and surface conditions

Applications

Parallel pins with internal threads as specified in EN ISO 8735:1997 are widely used in:

• Precision Alignment
  Ensuring exact positioning of components in jigs, fixtures, and machinery assemblies
• Fastening Systems
  Providing secure and removable positioning elements for mechanical assemblies requiring disassembly
• Industrial Manufacturing
  Automotive and aerospace manufacturing lines use these pins for accurate component placement and reliable joining
• Maintenance and Repair
  Replacement pins meeting the standard ensure consistent quality and fit during repairs and component refurbishments

Their hardened or stainless steel composition guarantees strength, corrosion resistance, and long service life, essential for demanding industrial environments.

Related Standards

• ISO 965-2 – General purpose metric screw threads; tolerances and limits for bolt and nut threads
• ISO 3506-1 – Corrosion-resistant stainless steel fasteners - Material specifications and mechanical properties
• ISO 4042 – Fasteners - Electroplated coatings, including processes to prevent hydrogen embrittlement
• ISO 3269 – Fasteners - Acceptance inspection procedures

These standards complement EN ISO 8735 by defining thread tolerance, corrosion performance, coating requirements, and quality assurance, ensuring full compliance for high-quality mechanical fastening components.

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Keywords: parallel pins, internal thread, hardened steel pins, martensitic stainless steel, ISO 8735, mechanical fasteners, precision pins, industrial fasteners, screw thread tolerances, corrosion-resistant pins, hardened steel fasteners, ISO standards pins

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zylinderstifte mit Innengewinde aus gehärtetem Stahl und martensitischem nichtrostendem Stahl (ISO 8735:1997)Goupilles cylindriques a trou taraudé en acier trempé et en acier inoxydable martensitique (ISO 8735:1997)Parallel pins with internal thread, of hardened steel or martensitic stainless steel (ISO 8735:1997)21.060.50Pins, nailsICS:Ta slovenski standard je istoveten z:EN ISO 8735:1997SIST EN ISO 8735:2001en01-julij-2001SIST EN ISO 8735:2001SLOVENSKI
STANDARD
AReference numberISO 8735:1997(E)INTERNATIONALSTANDARDISO8735Second edition1997-11-15Parallel pins with internal thread,of hardened steel and martensiticstainless steelGoupilles cylindriques à trou taraudé en acier trempé eten acier inoxydable martensitiqueSIST EN ISO 8735:2001

ISO 8735:1997(E)©
ISO 1997All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · [e-mail].400c=ch; a=400net; p=iso; o=isocs; s=centralPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies castinga vote.International Standard ISO 8735 was prepared by Technical CommitteeISO/TC 2, Fasteners.This second edition cancels and replaces the first edition (ISO 8735:1987),which has been technically revised.SIST EN ISO 8735:2001

INTERNATIONAL STANDARD
© ISOISO 8735:1997(E)1Parallel pins with internal thread of hardened steel andmartensitic stainless steel1
ScopeThis International Standard specifies the characteristics of parallel pins with internal thread of steel, throughhardened or case hardened and martensitic stainless steel, with nominal diameters d1 from 6 mm to 50 mminclusive.2
Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subjectto revision, and parties to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below. Members of IEC and ISOmaintain registers of currently valid International Standards.ISO 965-2:–1), ISO general purpose metric screw threads – Tolerances – Part 2: Limits of sizes for generalpurpose bolt and nut threads – Medium quality.ISO 3269:1988, Fasteners – Acceptance inspection.ISO 3506
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