BIS ISI Certification for Slugging Wrenches - IS 4508:1992

Published on: 05 Nov 2026

BIS ISI Certification for Slugging Wrenches - IS 4508:1992. Slugging wrenches are commonly used in oil refineries, construction sites, power plants, chemical industries and heavy machinery maintenance. These tools are specially designed to tighten or loosen large nuts and bolts with the help of hammer strikes. Unlike ordinary spanners, slugging wrenches have a thick, strong body and a striking end that can withstand heavy impact. However, if the wrench is manufactured using poor-quality material, it may crack, bend or break during use, creating serious safety risks for workers.
To improve product quality and safety, the Bureau of Indian Standards (BIS) has prescribed specific standards for slugging wrenches. Important 2026 Update: The earlier IS 4508:1992 has been replaced by IS 4508:2024, and Amendment No. 1 was introduced in February 2026. Manufacturers should now refer to the revised standard when applying for BIS ISI Certification.
What is BIS ISI Certification for Slugging Wrenches?
BIS ISI Certification is a product certification process through which the Bureau of Indian Standards verifies whether a product meets the applicable Indian Standard. For open-ended slugging wrenches, IS 4508:2024 specifies requirements relating to materials, dimensions, workmanship, hardness, protective coating and product marking.
For example, consider a manufacturer supplying slugging wrenches to an oil refinery. These wrenches may be struck repeatedly with a hammer to loosen tightly fitted bolts. If the tool is not properly manufactured, it may fail during operation. BIS certification helps establish that the manufacturer's product meets prescribed quality and performance requirements. After obtaining a licence under Scheme-I of the BIS (Conformity Assessment) Regulations, 2018, the manufacturer can use the ISI Mark on products covered by the licence.
What is IS 4508:2024 for Slugging Wrenches?
IS 4508:2024 is the Indian Standard titled Open Ended Slugging Wrenches (Spanners) — Specification (Second Revision). It applies to open-ended slugging wrenches, which have an open jaw at one end and a striking surface at the other. These tools are typically used where heavy force is required to loosen or tighten industrial fasteners.
The standard covers nominal wrench sizes from 19 mm to 230 mm and specifies dimensional tolerances, material requirements, protective coating, workmanship, hardness and marking. Manufacturers must also ensure that products are free from manufacturing defects such as cracks, sharp edges, burrs and seams that could affect performance or safety.
Latest BIS Updates and Amendments for Slugging Wrenches in 2026
BIS has introduced important revisions to the standard over the past two years.

Update

Important details

IS 4508:1992

Earlier Indian Standard for open-ended slugging wrenches

IS 4508:2024

Second revision of the standard, published in October 2024

12 February 2025

BIS issued implementation guidelines for the revised standard

8 April 2025

Last date for implementing the revised standard

23 February 2026

Amendment No. 1 established

22 August 2026

Last date of validity for the standard without Amendment No. 1

Major Changes Under IS 4508:2024

The revised standard introduced the following important changes:

Updated material specifications: Material designations were revised to align with newer Indian Standards. Manufacturers were required to provide updated specifications and conformity certificates for the relevant material grades.

Additional wrench sizes: Table 1 was modified to include additional nominal sizes. Manufacturers seeking to add new sizes to an existing licence must follow BIS requirements for change in scope of licence.

Updated product manual: BIS issued a revised product manual to guide manufacturers and certification officials regarding applicable requirements.

These changes were introduced to keep the standard aligned with technological developments and industry practices.
Amendment No. 1 of February 2026
BIS established Amendment No. 1 to IS 4508:2024 on 23 February 2026.
The Gazette notification permitted the version without the amendment to remain valid until 22 August 2026. As that transition period has ended, manufacturers should assess their products against IS 4508:2024 incorporating Amendment No. 1. The Gazette notification confirms the amendment's establishment and transition date. Manufacturers should consult the full amendment text to identify the exact technical changes affecting their products.
BIS Certification Mandatory Dates for Slugging Wrenches
The Hand Tools (Quality Control) Order, 2026, issued on 9 October 2026, revised the mandatory compliance schedule for specified hand tools, including open-ended slugging wrenches.

Enterprise category

Mandatory BIS compliance date

General enterprises

1 April 2027

Small enterprises

1 July 2027

Micro enterprises

1 October 2027

These dates concern mandatory certification under the Quality Control Order. They are separate from the earlier dates for implementing revisions to IS 4508. Manufacturers should complete their preparations before the applicable deadline to avoid disruptions when the requirements become mandatory.
Who Needs BIS Certification for Slugging Wrenches?
BIS certification requirements primarily apply to manufacturers of open-ended slugging wrenches covered by the Hand Tools Quality Control Order. Indian manufacturers must obtain the relevant certification before the applicable mandatory date. Foreign manufacturers supplying covered wrenches to India must also satisfy BIS requirements. Importers, wholesalers and distributors should verify that the products they purchase and sell comply with the applicable Indian Standard. The order also provides exemptions for domestically manufactured goods intended for export and limited imported samples for research and development, subject to prescribed conditions.
Technical Requirements Under IS 4508:2024
Before obtaining BIS ISI Certification, manufacturers must ensure that their slugging wrenches meet the required technical specifications.

Requirement

What it means

Material quality

Suitable steel grades must be used

Dimensions

Wrench sizes must meet specified measurements and tolerances

Hardness

Components must satisfy prescribed hardness requirements

Workmanship

Wrenches must be free from cracks, burrs and sharp edges

Protective coating

Suitable protection against rust and corrosion

Marking

Required product information must be clearly marked

These requirements help ensure that slugging wrenches can withstand demanding industrial conditions. The exact testing and inspection requirements should be checked against the current BIS product manual.
BIS ISI Certification Process for Slugging Wrenches
Manufacturers can obtain BIS certification through the following process:
Step 1: Identify the applicable standard
Confirm that the product falls under IS 4508:2024 and review Amendment No. 1.
Step 2: Prepare the manufacturing unit
Ensure that the factory has suitable manufacturing machinery, testing equipment and quality-control arrangements.
Step 3: Submit the BIS application
Apply through the BIS Manak Online portal along with the required factory and product documents.
Step 4: Complete product testing
The wrenches are assessed against the applicable requirements, including dimensions, materials, hardness and workmanship.
Step 5: Factory inspection
BIS evaluates the manufacturing facility and quality-control arrangements according to the applicable certification procedure.
Step 6: Obtain the BIS licence
After successful assessment, BIS may grant the manufacturer a licence to use the ISI Mark on products within the approved scope.
Documents Required for BIS ISI Certification
Manufacturers generally need to submit:

Business registration and factory address proof.

Manufacturing process flow chart.

List of manufacturing machinery.

List of testing equipment.

Product drawings and specifications.

Raw material details and conformity records.

Quality-control personnel details.

Product test reports, where applicable.

Authorisation documents and declarations.

BIS may require additional documentation depending on the application and manufacturing arrangements.
BIS Certification Fees and Timeline
The total cost of BIS ISI Certification for Slugging Wrenches depends on the application fee, inspection charges, laboratory testing, marking fees and other applicable costs. There is no fixed total certification cost for every manufacturer. Similarly, the time required depends on application completeness, testing, inspection and compliance with the applicable standard. Manufacturers should confirm the latest fee schedule and certification requirements directly through BIS before submitting their applications.
Benefits of BIS ISI Certification for Slugging Wrenches

BIS certification helps manufacturers demonstrate conformity with recognised Indian quality standards. It can increase customer confidence, improve product credibility and support compliance with mandatory government requirements.
For businesses supplying tools to refineries, engineering companies and industrial contractors, BIS-certified products can also support customer quality-assurance requirements. However, manufacturers must continue maintaining product quality after certification. An ISI licence is not permission to manufacture products that fail to meet the applicable standard.
How Compliance Calendar LLP Can Help
Compliance Calendar LLP assists manufacturers with BIS ISI Certification for Open Ended Slugging Wrenches under IS 4508:2024. Our assistance includes identifying applicable requirements, preparing documentation, coordinating testing, supporting BIS application filing and helping manufacturers address certification-related compliance requirements. Businesses can also seek assistance with understanding revised standards and preparing for factory inspections.
Frequently Asked Questions 
Q1. What is BIS ISI Certification for Slugging Wrenches?
Ans. It is a product certification process confirming that open-ended slugging wrenches meet the applicable Indian Standard.
Q2. What is the latest BIS Standard for Slugging Wrenches?
Ans. The current standard is IS 4508:2024, incorporating Amendment No. 1 of February 2026.
Q3. Is BIS Certification mandatory for Slugging Wrenches?
Ans. Yes. Covered open-ended slugging wrenches require BIS certification from the applicable dates under the Hand Tools Quality Control Order.
Q4. What is the difference between IS 4508:1992 and IS 4508:2024?
Ans. The revised standard updates material designations, includes additional nominal sizes and incorporates updated technical requirements.
Q5. When does BIS Certification become mandatory for Slugging Wrenches?
Ans. The deadlines are 1 April 2027 for general enterprises, 1 July 2027 for small enterprises and 1 October 2027 for micro enterprises.
Q6. Who can apply for BIS ISI Certification?
Ans. Indian and foreign manufacturers producing covered open-ended slugging wrenches can apply through the applicable BIS certification procedure.
Q7. What tests are required under IS 4508:2024?
Ans. Applicable assessments include material conformity, dimensional checks, hardness, workmanship and other requirements specified in the standard.
Q8. What is the cost of BIS Certification for Slugging Wrenches?
Ans. The cost depends on application fees, testing charges, inspections, marking fees and other applicable requirements.
Q9. Can manufacturers use the ISI Mark without a BIS licence?
Ans. No. The ISI Mark can be used only under a valid BIS licence covering the relevant products.
Q10. How can manufacturers apply for BIS ISI Certification online?
Ans. Manufacturers can submit their applications through the BIS Manak Online portal with the required documents and product details.

Slugging wrenches are commonly used in oil refineries, construction sites, power plants, chemical industries and heavy machinery maintenance. These tools are specially designed to tighten or loosen large nuts and bolts with the help of hammer strikes. Unlike ordinary spanners, slugging wrenches have a thick, strong body and a striking end that can withstand heavy impact. However, if the wrench is manufactured using poor-quality material, it may crack, bend or break during use, creating serious safety risks for workers.

To improve product quality and safety, the Bureau of Indian Standards (BIS) has prescribed specific standards for slugging wrenches. Important 2026 Update: The earlier IS 4508:1992 has been replaced by IS 4508:2024, and Amendment No. 1 was introduced in February 2026. Manufacturers should now refer to the revised standard when applying for BIS ISI Certification.

What is BIS ISI Certification for Slugging Wrenches?

BIS ISI Certification is a product certification process through which the Bureau of Indian Standards verifies whether a product meets the applicable Indian Standard. For open-ended slugging wrenches, IS 4508:2024 specifies requirements relating to materials, dimensions, workmanship, hardness, protective coating and product marking.

For example, consider a manufacturer supplying slugging wrenches to an oil refinery. These wrenches may be struck repeatedly with a hammer to loosen tightly fitted bolts. If the tool is not properly manufactured, it may fail during operation. BIS certification helps establish that the manufacturer's product meets prescribed quality and performance requirements. After obtaining a licence under Scheme-I of the BIS (Conformity Assessment) Regulations, 2018, the manufacturer can use the ISI Mark on products covered by the licence.

What is IS 4508:2024 for Slugging Wrenches?

IS 4508:2024 is the Indian Standard titled Open Ended Slugging Wrenches (Spanners) — Specification (Second Revision). It applies to open-ended slugging wrenches, which have an open jaw at one end and a striking surface at the other. These tools are typically used where heavy force is required to loosen or tighten industrial fasteners.

The standard covers nominal wrench sizes from 19 mm to 230 mm and specifies dimensional tolerances, material requirements, protective coating, workmanship, hardness and marking. Manufacturers must also ensure that products are free from manufacturing defects such as cracks, sharp edges, burrs and seams that could affect performance or safety.

Latest BIS Updates and Amendments for Slugging Wrenches in 2026

BIS has introduced important revisions to the standard over the past two years.

Update	Important details
IS 4508:1992	Earlier Indian Standard for open-ended slugging wrenches
IS 4508:2024	Second revision of the standard, published in October 2024
12 February 2025	BIS issued implementation guidelines for the revised standard
8 April 2025	Last date for implementing the revised standard
23 February 2026	Amendment No. 1 established
22 August 2026	Last date of validity for the standard without Amendment No. 1

Major Changes Under IS 4508:2024

The revised standard introduced the following important changes:

Updated material specifications: Material designations were revised to align with newer Indian Standards. Manufacturers were required to provide updated specifications and conformity certificates for the relevant material grades.
Additional wrench sizes: Table 1 was modified to include additional nominal sizes. Manufacturers seeking to add new sizes to an existing licence must follow BIS requirements for change in scope of licence.
Updated product manual: BIS issued a revised product manual to guide manufacturers and certification officials regarding applicable requirements.

These changes were introduced to keep the standard aligned with technological developments and industry practices.

Amendment No. 1 of February 2026

BIS established Amendment No. 1 to IS 4508:2024 on 23 February 2026.

The Gazette notification permitted the version without the amendment to remain valid until 22 August 2026. As that transition period has ended, manufacturers should assess their products against IS 4508:2024 incorporating Amendment No. 1. The Gazette notification confirms the amendment's establishment and transition date. Manufacturers should consult the full amendment text to identify the exact technical changes affecting their products.

BIS Certification Mandatory Dates for Slugging Wrenches

The Hand Tools (Quality Control) Order, 2026, issued on 9 October 2026, revised the mandatory compliance schedule for specified hand tools, including open-ended slugging wrenches.

Enterprise category	Mandatory BIS compliance date
General enterprises	1 April 2027
Small enterprises	1 July 2027
Micro enterprises	1 October 2027

Who Needs BIS Certification for Slugging Wrenches?

BIS certification requirements primarily apply to manufacturers of open-ended slugging wrenches covered by the Hand Tools Quality Control Order. Indian manufacturers must obtain the relevant certification before the applicable mandatory date. Foreign manufacturers supplying covered wrenches to India must also satisfy BIS requirements. Importers, wholesalers and distributors should verify that the products they purchase and sell comply with the applicable Indian Standard. The order also provides exemptions for domestically manufactured goods intended for export and limited imported samples for research and development, subject to prescribed conditions.

Technical Requirements Under IS 4508:2024

Before obtaining BIS ISI Certification, manufacturers must ensure that their slugging wrenches meet the required technical specifications.

Requirement	What it means
Material quality	Suitable steel grades must be used
Dimensions	Wrench sizes must meet specified measurements and tolerances
Hardness	Components must satisfy prescribed hardness requirements
Workmanship	Wrenches must be free from cracks, burrs and sharp edges
Protective coating	Suitable protection against rust and corrosion
Marking	Required product information must be clearly marked

BIS ISI Certification Process for Slugging Wrenches

Manufacturers can obtain BIS certification through the following process:

Step 1: Identify the applicable standard

Confirm that the product falls under IS 4508:2024 and review Amendment No. 1.

Step 2: Prepare the manufacturing unit

Ensure that the factory has suitable manufacturing machinery, testing equipment and quality-control arrangements.

Step 3: Submit the BIS application

Apply through the BIS Manak Online portal along with the required factory and product documents.

Step 4: Complete product testing

The wrenches are assessed against the applicable requirements, including dimensions, materials, hardness and workmanship.

Step 5: Factory inspection

BIS evaluates the manufacturing facility and quality-control arrangements according to the applicable certification procedure.

Step 6: Obtain the BIS licence

After successful assessment, BIS may grant the manufacturer a licence to use the ISI Mark on products within the approved scope.

Documents Required for BIS ISI Certification

Manufacturers generally need to submit:

Business registration and factory address proof.
Manufacturing process flow chart.
List of manufacturing machinery.
List of testing equipment.
Product drawings and specifications.
Raw material details and conformity records.
Quality-control personnel details.
Product test reports, where applicable.
Authorisation documents and declarations.

BIS may require additional documentation depending on the application and manufacturing arrangements.

BIS Certification Fees and Timeline

The total cost of BIS ISI Certification for Slugging Wrenches depends on the application fee, inspection charges, laboratory testing, marking fees and other applicable costs. There is no fixed total certification cost for every manufacturer. Similarly, the time required depends on application completeness, testing, inspection and compliance with the applicable standard. Manufacturers should confirm the latest fee schedule and certification requirements directly through BIS before submitting their applications.

Benefits of BIS ISI Certification for Slugging Wrenches

For businesses supplying tools to refineries, engineering companies and industrial contractors, BIS-certified products can also support customer quality-assurance requirements. However, manufacturers must continue maintaining product quality after certification. An ISI licence is not permission to manufacture products that fail to meet the applicable standard.

How Compliance Calendar LLP Can Help

Compliance Calendar LLP assists manufacturers with BIS ISI Certification for Open Ended Slugging Wrenches under IS 4508:2024. Our assistance includes identifying applicable requirements, preparing documentation, coordinating testing, supporting BIS application filing and helping manufacturers address certification-related compliance requirements. Businesses can also seek assistance with understanding revised standards and preparing for factory inspections.

Frequently Asked Questions

Q1. What is BIS ISI Certification for Slugging Wrenches?

Ans. It is a product certification process confirming that open-ended slugging wrenches meet the applicable Indian Standard.

Q2. What is the latest BIS Standard for Slugging Wrenches?

Ans. The current standard is IS 4508:2024, incorporating Amendment No. 1 of February 2026.

Q3. Is BIS Certification mandatory for Slugging Wrenches?

Ans. Yes. Covered open-ended slugging wrenches require BIS certification from the applicable dates under the Hand Tools Quality Control Order.

Q4. What is the difference between IS 4508:1992 and IS 4508:2024?

Ans. The revised standard updates material designations, includes additional nominal sizes and incorporates updated technical requirements.

Q5. When does BIS Certification become mandatory for Slugging Wrenches?

Ans. The deadlines are 1 April 2027 for general enterprises, 1 July 2027 for small enterprises and 1 October 2027 for micro enterprises.

Q6. Who can apply for BIS ISI Certification?

Ans. Indian and foreign manufacturers producing covered open-ended slugging wrenches can apply through the applicable BIS certification procedure.

Q7. What tests are required under IS 4508:2024?

Ans. Applicable assessments include material conformity, dimensional checks, hardness, workmanship and other requirements specified in the standard.

Q8. What is the cost of BIS Certification for Slugging Wrenches?

Ans. The cost depends on application fees, testing charges, inspections, marking fees and other applicable requirements.

Q9. Can manufacturers use the ISI Mark without a BIS licence?

Ans. No. The ISI Mark can be used only under a valid BIS licence covering the relevant products.

Q10. How can manufacturers apply for BIS ISI Certification online?

Ans. Manufacturers can submit their applications through the BIS Manak Online portal with the required documents and product details.

Article last updated on : 05 Nov 2026.