DIN 917:2021
DIN · 2021-11-00

Hexagon cap nuts, low type

ICS 21.060.20

1Key Takeaways

The document contains dimensional and technical requirements of hexagon cap nuts and specifies their designation.

2Expert Interpretation

This in-depth analysis of the technical requirements of the DIN 917:2021 standard for low-profile hexagonal cap nuts covers key aspects such as dimensions, material properties, and surface treatment. It compares the 2015 edition with key updates and provides selection and application recommendations. This product is suitable for Class A metric threads from M4 to M72.

Standard Overview

DIN 917:2021 is the technical standard for low profile hexagonal cap nuts issued by the German Institute for Standardization (DIN), replacing the 2015 edition. DIN 917:2015:2019 DIN 917:2021:2022 Structure selection Unspecified Manufacturers can freely choose Form A/B (when not specified) Size range M4-M72 Thread undercut/clearing length of extended specifications Material requirements No limit on lead content New lead content ≤0.1% (special circumstances need to be negotiated)

Key dimensional parameters

The standard specifies the dimensions of different thread specifications in detail through 4 tables (unit: mm):

  1. Table 1: M4-M10 specifications (including fine threads M8×1, M10×1, etc.)
  2. Table 2: M12-M20 specifications (including fine threads M12×1.5, etc.)
  3. Table 3: M22-M36×3 specifications (including fine thread M22×2, etc.)
  4. Table 4: M42-M72×4 specifications (including fine thread M42×3, etc.)

Typical dimensional parameters include:

  • Thread depth t = 0.7-5.5mm (increases with specification)
  • Wall thickness w = 1.0-5.0mm
  • Hexagonal width across flats s = 5.5-85mm

Material and surface treatment

According to standard Table 5:

Material type Implementation standard Surface requirements
Stainless steel (A1/A2/A4) DIN EN ISO 3506-2 Clean metallic luster/passivation treatment
Copper-zinc alloy DIN EN 28839 Electroplating protection (according to DIN EN ISO 4042)

Implementation recommendations

  1. Selection Notes: For M10/M12/M14/M22 specifications, the hexagonal width across flats (SW) must be indicated in the marking.
  2. Special requirements: When Form B structure is required, "B" should be added after the model number (e.g., DIN 917-M8-B-St)
  3. Acceptance criteria: Acceptance test according to DIN EN ISO 3269, surface defect limits refer to DIN EN ISO 6157-2

3Version History

DIN 917:2015 newer

4Standard Metadata

Standard Number
DIN 917:2021
Status
Current (70% confidence)
Publisher
German Institute for Standardization
Publication Date
2021-11-00
ICS Classification
21.060.20 (Nuts) 
Replaced By
DIN 917:2015

5Citation Network

0
Cite this standard
12
Referenced herein
Referenced by DIN 917:2021
DIN 267-2 DIN 267-24 DIN 76-1 DIN EN 28839 DIN EN ISO 225 DIN EN ISO 3269 DIN EN ISO 3506-2 DIN EN ISO 4042

6Frequently Asked Questions

What is DIN 917:2021?
DIN 917:2021 — Hexagon cap nuts, low type is an international standard developed by German Institute for Standardization. The document contains dimensional and technical requirements of hexagon cap nuts and specifies their designation.
What does DIN 917:2021 cover?
This standard covers: The document contains dimensional and technical requirements of hexagon cap nuts and specifies their designation.
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of DIN 917:2021?
The current published version is DIN 917:2021, published on 2021-11-00. Always check for amendments or pending revisions.
How do I purchase DIN 917:2021?
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