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Frequently asked questions

How do you determine the bolt length to be used in female anchors?

Female anchors are supplied without a bolt, which must be purchased separately by the installer

Its length depends on two conditions:

  • Too short a length could result in the bolt engaging with too few threads in the female thread on the female sleeve anchor, causing either the bolt’s male thread or the sleeve’s female thread to fail.
  • An excessive length could result in the tip of the bolt coming into contact with the expansion cone of the anchor before the bolt head rests on the material to be fixed. In this case, the bolt is prevented from advancing, so the application of a successive torque could cause the anchor sleeve to break due to the traction effect that the bolt threads exert on the sleeve.
Example of a 1/4″ female anchor (top photo) breaking during installation due to excessive bolt length

To calculate the correct bolt length, the indications in the VBT technical documentation must be taken into account:

For example, for a 3/8 female anchor (code HENL038), when the thickness of the material to be fixed is tfix = 10 mm

METRICS1/4″3/8″1/2″
d0: diameter of drill bit[inches]3/8”1/2″5/8”
df: anchor plate diameter <[mm]5/16”7/16”9/16”
Tins: installation torque[Nm]31126
h1: drilling depth[inches]1-1/16”1-11/16”2-1/8”
hnom: installation depth[inches]1”1-5/8”2”
e: bolt length*[inches]1/4” ÷ 3/8”3/8” ÷ 5/8”1/2″ ÷ 7/8”
scr, N: critical distance between anchors[inches]3 7/84-3/4”5-7/8”
ccr, N: critical edge distance[inches]1-1/2”2-3/8”3”
smin: minimum distance between anchors[inches]2-3/8”3-3/16”4”
cmin: minimum edge distance[inches]4-1/8”5-1/2”6-7/8”
hmin: minimum concrete thickness[inches]44”4”
Installation tool[-]EXHBM06EXHBM08EXHBM10
  • Minimum bolt length = 3/8” + 3 + 10 = 23 mm = 7/8”
  • Maximum bolt length = 5/8” + 3 + 10 = 29 mm = 1 – 1/8”

Therefore, the most appropriate solution for this case would be to use a 3/8” x 1” bolt.

For the rest of the installation parameters, the values indicated in the technical documentation must be followed

hef : Effective embedment depth
h1 : Bore hole depth
hnom : Embedment depth in the concrete
hmin : Min. concrete thickness
tfix : Fixture thickness
do : Nominal drilling diameter
df : Fixture clearance hole diameter

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VBT
Av. Laurel 205 Fracc. industrial El Vergel
38110-Celaya Guanajuato – México

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TECHNICAL TRAINING

Our engineering department provides specific and personalised training on the different topics related to fixing systems: metallic or chemical fixings, installation systems, regulations, calculations, etc.

 

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According to Data Protection legislation, you are strongly advised not to send high-level personal data, such as those relating to health, as they are not encoded or encrypted. Should these details be sent, it is done so under your sole responsibility.

The user may at any time exercise their rights of access, rectification, cancellation and opposition under the provisions of the General Data Protection Regulation (GDPR) 2016 by sending a letter together with a photocopy of your ID, to P.I. La Portalada II | c/ Segador 13, 26006 | Logroño (La Rioja).
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site visits

The relationship with our customers does not end with the sale of our products. At INDEX® we understand that it is often necessary to accompany them on site, where our experience is the best ally to ensure fits works perfectly. Our engineers and technicians support the managers of each project in planning and selecting the best solution for effectively saving time and money.

TÉCNICAS EXPANSIVAS S.L. informs that the personal data provided voluntarily on this website will be processed and incorporated into the corresponding files, responsibility of TÉCNICAS EXPANSIVAS S.L, is reported at the time of personal data collection, although, according to the specific case, its purpose may be any of the following: attention to your referred request, complaint or question, established relationship maintenance, comprehensive and commercial customer management, accounting and billing or sending communications, including electronic media, news and activities related to TÉCNICAS EXPANSIVAS S.L.

The data in our files are strictly confidential and shall be treated with the utmost confidentiality and shall comply with all the requirements provided for the General Data Protection Regulation (GDPR) 2016.

According to Data Protection legislation, you are strongly advised not to send high-level personal data, such as those relating to health, as they are not encoded or encrypted. Should these details be sent, it is done so under your sole responsibility.

The user may at any time exercise their rights of access, rectification, cancellation and opposition under the provisions of the General Data Protection Regulation (GDPR) 2016 by sending a letter together with a photocopy of your ID, to P.I. La Portalada II | c/ Segador 13, 26006 | Logroño (La Rioja).
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ENGINEERING SERVICES AND CALCULATIONS

At INDEX® we want to offer our customers the most comprehensive service. In addition to providing them with the best fixing and anchor solutions, our team of specialised engineers technically advises all our customers. We also have powerful software tools to do any necessary calculations with total accuracy.

TÉCNICAS EXPANSIVAS S.L. informs that the personal data provided voluntarily on this website will be processed and incorporated into the corresponding files, responsibility of TÉCNICAS EXPANSIVAS S.L, is reported at the time of personal data collection, although, according to the specific case, its purpose may be any of the following: attention to your referred request, complaint or question, established relationship maintenance, comprehensive and commercial customer management, accounting and billing or sending communications, including electronic media, news and activities related to TÉCNICAS EXPANSIVAS S.L.

The data in our files are strictly confidential and shall be treated with the utmost confidentiality and shall comply with all the requirements provided for the General Data Protection Regulation (GDPR) 2016.

According to Data Protection legislation, you are strongly advised not to send high-level personal data, such as those relating to health, as they are not encoded or encrypted. Should these details be sent, it is done so under your sole responsibility.

The user may at any time exercise their rights of access, rectification, cancellation and opposition under the provisions of the General Data Protection Regulation (GDPR) 2016 by sending a letter together with a photocopy of your ID, to P.I. La Portalada II | c/ Segador 13, 26006 | Logroño (La Rioja).
Read more