Spring Hammer Index page Lansbury International - FAQ Impact Hammer Calibration

Frequently Asked Questions: Answers:
What is a Spring Impact Test Hammer?
and what is it used for?
A Spring Operated Impact Test Hammer is an instrument which delivers a precise impact energy for product testing purposes.
It is specified in British & International Standards BS EN 60068-2-75:1997 and BS EN/IEC 60068-2-75:2014
It is made from Steel, Brass, Nylon, Neoprene & Traffalite. Finishes are chrome & zinc. Components are manufactured and assembled in the UK.
The Spring Hammer is used by Testing Organisations and Manufacturers to test the impact resistance of their products, as required by product safety standards. It is widely used by companies making electrical or electronic equipment and domestic products.
How is it used?
The International standard or requirement document that calls for the use of a Spring Impact Hammer will usually detail the procedure to follow for the testing of the products in question. See IK ratings below.
What British, European and International standards apply to Spring Hammers?
In terms of manufacture and calibration, the following standards are of note:
IEC 817:1984
BS 7003:1988
IEC 68-2-63:1991
BS EN 60068-2-63:1995
BS EN 60068-2-75:1997
IEC 60068-2-75:1997
BS EN 60068-2-75:2014
IEC 60068-2-75:2014
The Calibration procedure is by means of a pendulum comparator, with impact values from 0.2 J(Nm) to 1.0 J(Nm)
Measurement tools are calibrated by accredited external facilities.
What IK rating or international standard applies and what Impact Energy in Newton Metres or Joules (Nm/J) do you need to test for?
Lansbury International manufacture single value impact test hammers,
which are factory set to any standard impact within the instrument range (0.2Nm - 1.0Nm).
We only supply single setting hammers. If there is a requirement for different impact energies, there are advantages in having a collection of single setting hammers, which include being able to test more than one product type at a time. The calibration turn round time is also considerably less for a single setting hammer, which means the equipment is out of the clients test lab for less time.
If you are only sending one hammer away for calibration at a time, you can continue testing with the other value hammers, which means less disruption for your test laboratory.
We also offer an attractive discount on order quantities over 3 Hammers.
IK01 IK02 IK03 IK04 IK05 IK06
0.14J 0.2J 0.35J 0.5J 0.7J 1.0J
What is the Warranty Period for a new Spring Hammer?
12 months for Lansbury International products
How long is the Certificate valid?
The official UKAS answer is that the paper ‘Certificate’ is valid indefinitely, however, the calibration validity is another matter.
What is the recommended calibration interval?
We recommend 12 Months calibration interval
Can we measure the Impact ourselves?
No, not with UKAS traceability
Can we have a Certificate issued with a longer “due date” e.g. 2 years or 5 years?
Although we recommend 12 months calibration interval (and that is what was originally specified in the first standard), UKAS will not allow us to impose a time limit, stating that it is up to the Customer to determine, through usage and other factors, how often the spring hammer should be calibrated – bearing in mind this limitation, we do not specify a “Calibration Due Date” on the certificates
Are dimensional and weight checks performed prior to Calibration?
Yes, we check dimensions and weights of sub-assemblies for Lansbury Hammers, but not all component details are recorded
Are you a BSi member?
Yes, BSi membership number 41110550
What is the use of the UKAS accredited traceable Calibration Certificate?
Usually the reason for getting something independently evaluated is to confirm it meets specific requirements in order to reduce risks. Accreditation by UKAS means that evaluators, including testing and calibration laboratories, have been assessed against internationally recognised standards to demonstrate their competence, impartiality and performance capability.
UKAS accreditation means the evaluator can show to its customer that it has been successful at meeting the requirements of international accreditation standards.
What laboratory standards do Lansbury International operate to?
BS EN IS0/IEC 17025:2017 General Requirements for the competence of testing and calibration laboratories
Are you an accredited laboratory?
traceable to National Standards?
Yes, we are accredited by UKAS for calibration work.
All relevant measurements are traceable to National and International standards
What is your Accreditation Number?
UKAS Calibration 0328
Do you have a Quality Manual?
Can we see a copy?
Yes, we have a Quality Manual based on BS EN ISO/IEC 17025:2017
No, it won’t do you any good
What is the Rockwell Hardness of the Hammer Head material?
Can you show Traceability for the Rockwell Hardness?

The Nominal Rockwell Hardness of the hammer head is HRR 100 (Rockwell R scale).
All the new material for the hammer's striking head is from a certificated batch with full traceability within HRR 85 - 100 from our suppliers.
No individual Certificates are available.
17a What is the radius of the hammer head?
What is the mass of the striking element?
What is the mass of the body assembly?
What is the mass of the cone unit?
The hammer head is CNC machined to have a spherical radius of 10mm.
The mass of the hammer assembly striking element is 250gm +/- 1gm.
The mass of the body assembly is 1,250 gm.
The cone has a mass of 60 gm.
Is there a quantity discount for New Hammers?
Yes, 5% discount for 3 or 4 new hammers and 10% for quantity 5-9 new hammers
What is the Delivery time for New Hammers?
2 - 4 weeks, excluding overseas carriage. Note: spring hammers are built to order.
What is the turn around time for recalibration?
Less than 2 weeks, excluding overseas carriage. Please contact us for pre-booking calibration slots. We cannot guarantee to turnround hammers quickly if they arrive "out of the blue"... Please call us first!
Do you close for Summer/Christmas Holidays?
2 weeks during summer and Christmas and New Year holidays
Why do we have to pay against Pro-forma invoice?
Payment is required before equipment is despatched
Why are invoices issued by Lansbury International but payment due to Control Plant Ltd? 
we are Control Plant Limited trading as Lansbury International
What is your UK VAT registration number?
Please contact our office for details
What are your bank details for invoice payment?
Please contact our office for bank transfer details
What are the charges for delivery?
Please enquire via email form as these vary between countries
27 What is the Commodity Code? The Customs Commodity Code for Spring Hammers is: 90 24 80 00
Do you offer demonstrations?
No, because every product test would be slightly different
Do you Hire/Loan Spring Impact hammers?
Not normally, however, we have a small number of units that can be loaned on a short-term basis
How long has Lansbury International been making and Calibrating Spring Impact Hammers?
Well over 40 years, on the same site in Woking
Which major international organisations do you supply?
This is a small sample from thousands of our customers:
BSi Testing
Canadian Standards Association
Dimplex (UK) Ltd
ERA Technology Ltd
Fluke UK Ltd
General Electric (USA)
Hewlett-Packard Co
Indian Standards Institution
JVC (UK) Ltd
Kingfisher Asia Ltd
LEC Refrigeration Plc
National Panasonic (UK) Ltd
Osram (GEC) Ltd
Philips Consumer Electronics B.V.
QA Testing Centre Ltd
RS Components Ltd
Sri Lanka Institute of Scientific Industrial Research
Testing Certification Australia
Underwriters Laboratories (UL International)
Valor Heating Ltd
W.H. Smith Sons (Tools) Ltd
Xerox Corporation
York EMC Services Ltd
Zanussi Elettrodomestici
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