Manual Bosch AdvancedImpactDrive 18 (page 14 of 175) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian)

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14 | English

The impact duration is to be determined for each required

tightening torque. The actually achieved tightening torque is

always to be checked with a torque wrench.

Screw applications with hard, spring-loaded or soft seats

When the achieved torques in an impact series are measured

during a test and transferred into a diagram, the result is the

curve of a torque characteristic. The height of the curve cor-

responds with the maximum reachable torque, and the

steepness indicates the duration in which this is achieved.

A torque gradient depends on the following factors:

– Strength properties of the screws/nuts

– Type of backing (washer, disc spring, seal)

– Strength properties of the material being screwed/bolted

together

– Lubrication conditions at the screw/bolt connection

The following application cases result accordingly:

– A hard seat is a metal-to-metal screw application which

uses washers. After a relatively short impact duration, the

maximum torque is reached (steep characteristic curve).

Unnecessary long impact duration only causes damage to

the machine.

– A spring-loaded seat is also a metal-to-metal screw ap-

plication but uses spring washers, disc springs, studs or

screws/nuts with conical seats. It is also called a spring-

loaded seat when extensions are used.

– A soft seat is a screw application of e.g. metal on wood or

a screw application that uses lead washers or fibre wash-

ers as backing.

For a spring-loaded seat as well as for a soft seat, the max-

imum tightening torque is lower than for a hard seat. Also, a

clearly longer impact duration is required.

Guide values for maximum screw tightening torques

Figures given in Nm; calculated from the tensional cross-section; utilization of the yield point: 90% (with friction coefficient

µtotal=0.12). As a control measure, always check the tightening torque with a torque wrench.

Property Classes

according to

DIN267

Standard Screws/Bolts High-strength Bolts

3.6 4.6 5.6 4.8 6.6 5.8 6.8 6.9 8.8 10.9 12.9

M6 2.71 3.61 4.52 4.8 5.42 6.02 7.22 8.13 9.7 13.6 16.2

M8 6.57 8.7 11 11.6 13.1 14.6 17.5 19.7 23 33 39

M10 13 17.5 22 23 26 29 35 39 47 65 78

M12 22.6 30 37.6 40 45 50 60 67 80 113 135

M14 36 48 60 65 72 79 95 107 130 180 215

M16 55 73 92 98 110 122 147 165 196 275 330

Tips

Before screwing larger, longer screws into hard materials, it

is advisable to pre-drill a pilot hole with the core diameter of

the thread to approx. 2/3 of the screw length.

Maintenance and Service

Maintenance and Cleaning

uClean the air vents on your power tool regularly. The

motor’s fan will draw the dust inside the housing and ex-

cessive accumulation of powdered metal may cause elec-

trical hazards.

uRemove the battery from the power tool before carry-

ing out work on the power tool (e.g. maintenance,

changing tool, etc.). The battery should also be re-

moved for transport and storage. There is risk of injury

from unintentionally pressing the on/off switch.

uTo ensure safe and efficient operation, always keep

the power tool and the ventilation slots clean.

After-Sales Service and Application Service

Our after-sales service responds to your questions concern-

ing maintenance and repair of your product as well as spare

parts. You can find explosion drawings and information on

spare parts at: www.bosch-pt.com

The Bosch product use advice team will be happy to help you

with any questions about our products and their accessor-

ies.

In all correspondence and spare parts orders, please always

include the 10‑digit article number given on the nameplate

of the product.

Great Britain

Robert Bosch Ltd. (B.S.C.)

P.O. Box 98

Broadwater Park

North Orbital Road

Denham Uxbridge

UB 9 5HJ

At www.bosch-pt.co.uk you can order spare parts or arrange

the collection of a product in need of servicing or repair.

Tel. Service: (0344) 7360109

E-Mail: boschservicecentre@bosch.com

You can find further service addresses at:

www.bosch-pt.com/serviceaddresses

Transport

The contained lithium-ion batteries are subject to the Dan-

gerous Goods Legislation requirements. The batteries are

suitable for road-transport by the user without further re-

strictions.

1 609 92A 4XB | (17.11.2020) Bosch Power Tools

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Bosch AdvancedImpactDrive 18 Manual

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