Valid

GB/T 6091-2022Knife straight edge (English PDF)

刀口形直尺

Preview PDF

This is a limited preview

Buy now to download the full PDF (15 pages)

Need quotation for your management?

Get a formal quotation for GB/T 6091-2022 in 30 minutes.

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 11, 2022

Implementation date

February 1, 2023

Scope

GB/T 6091-2022 is the English-translated version of 刀口形直尺.

GB/T 6091-2022 is the Chinese national product standard for knife straight edges, and clause 1 applies it to those with a measuring surface length L of 500 mm or less.

It fixes the types, namely the rule with one measuring face, the one with three faces at 60° to each other and the one with four faces at 90°, the basic parameters, the shape of the measuring surface and the requirements for appearance, materials, hardness and surface roughness, straightness tolerance and demagnetization.

It then gives the inspection conditions, temperature, humidity and isothermal conditions, the inspection methods for those same characteristics, and the marking and packaging.

Its foreword states that this edition adds the 100, 150, 175 and 225 sizes and stainless steel as a material. It replaces GB/T 6091-2004, was issued on 11 July 2022 and has applied since 1 February 2023.

Found what you need?

Document preview — GB/T 6091-2022

National Standard of the People's Republic of China

ICS: 17.040.30
Classification: J 42
Replacing: GB/T 6091-2004

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Types and basic parameters
4.1 Type
4.2 Basic parameters
4.3 Measuring surface shape
5 Requirements
5.1 Appearance
5.2 Materials
5.3 Device
5.4 Hardness and surface roughness
5.5 Straightness tolerance
5.6 Demagnetization
6 Inspection conditions
6.1 Check temperature and humidity
6.2 Isothermal conditions
7 Inspection method
7.1 Appearance
7.2 Surface roughness of the measuring surface
7.3 Hardness of the measuring part
7.4 Straightness of the measuring surface
7.5 Demagnetization
8 Logo and packaging

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB/T 6091-2004 "Knife-edge ruler", compared with GB/T 6091-2004, except for structural adjustment and editorial changes Besides, the main technical changes are as follows.

a) 100, 150, 175, 225 specifications have been added to the knife-edge ruler (see Table 1 and Table 2);

b) The material is increased by stainless steel (see 5.2);

c) Unify the hardness parameters, the hardness requirements increase the hardness of stainless steel (see 5.4.1, 5.4.1 of the 2004 edition);

d) Deleted the straightness tolerance class requirements for the measuring surface of the knife-edge ruler (see 5.4.1 of the 2004 edition);

e) Added inspection conditions (see Chapter 6);

f) The inspection method for appearance is added (see 7.1);

g) The inspection method for the surface roughness of the measurement surface is added (see 7.2);

h) The test method for the hardness of the measuring part is added (see 7.3);

i) The accuracy grades in the marking and packaging (7.1 and 7.2 of the 2004 edition) have been deleted.

1 Scope

This document specifies the types and basic parameters, requirements, inspection conditions, inspection Inspection methods and signs and packaging, etc.

This document applies to knife-edge straightedges with a measuring surface length L less than or equal to 500mm.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 17164 Terminology of Geometric Measuring Instruments Product Terminology

3 Terms and Definitions

GB/T 17164 and the following terms and definitions apply to this document.

3.4 Knife-edge ruler with four measuring surfaces at 90° to each other

3.3 Knife-edge ruler with three measuring surfaces at an angle of 60° to each other

3.1 knife-edge ruler

The measuring surface is in the shape of a cutting edge and is a physical measuring tool used to measure the plane shape error of the workpiece.

3.2 Knife-edge ruler with one measuring face

4 Types and basic parameters

4.1 Type

The type of knife-edge ruler is shown in Figures 1 to 3, and the figures are for illustration only.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 17164Glossary of terms for dimensional measuring instruments - Product terms

Cited by

Similar standards

GB/T 19878-2026|GB/T 47121-2026|GB/T 10922-2025|GB/T 24468-2025|GB/T 34874.1-2025|GB/T 34874.4-2025

Editions of GB/T 6091

Edition	Title	Revision	Status
GB/T 6091-2022	Knife straight edge	current edition	Current
GB/T 6091-2004	Knife straight edge	previous edition	Superseded

This page sells the current edition, GB/T 6091-2022. Earlier editions are listed for reference only.

How to Download GB/T 6091-2022

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.