Question: How Much Torque Does A Bolt Need?

How tight is hand tight torque?


finger tight.

(of a screwed connection) tightened using the fingers, and no tools, to a torque of about 15 to 20 inlb or 1.7 to 2.3 Nm..

What is the torque tightening value required for M16 bolts?

Torque Tightening Values for Structural Steel BoltsMaximum Recommended Tightening TorquesMetric Course PitchGrade 12.9 PlatedGrade 8.8 PlatedM1211970(M14)189112M1629517518 more rows

How much torque do you need for a bolt?

The first factor is the bolt’s diameter. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt because it is larger in diameter….What is the Proper Torque to Use on a Given Bolt. by Joe Greenslade.Product: 3/4-10 Grade 5 zinc plated bolt• P=23.046 pounds5 more rows

How tight should bolts be?

In general, you should make the bolt tight enough so that the items it is holding together stay together, but not so tight that you damage the bolt’s threads. You should tighten bolts properly so that the bolt performs properly.

What happens if you over torque a bolt?

Everyone who has ever worked with fasteners has accidentally messed one up at some point. One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.

What can happen if too little torque is applied?

Insufficient torque When you apply exactly the right amount of fastening force, you can rest assured that the bolt will transfer the ‘hits’ as well as the load of the belt to the bulk of the engine, which will absorb them. … This, in turn, will lead to incorrect belt tension and, eventually, to belt and/or engine damage.

How do you know if a bolt is tight enough?

One convention is to follow the “snug-tight” method where bolts are tightened until first sign of resistance and then given another quarter turn. Another convention is to use direct tension indicators. Direct tension indicators are washers that have small protrusions on them.

What is the max torque for a bolt?

ASTM A325Bolt SizeTPITightening Torque Range (ft lbs) (Min – Max)Galv+Waxed1⁄21350 – 585⁄81199 – 1203⁄410175 – 2136 more rows

Is code for bolt tightening torque?

10 Snug Tight – The level of tightness attained by a few impacts of an impact wrench or by the full efforts of a man using a Standard/ podger spanner or a spud wrench. Bolts, nuts and washers shall conform to IS 3757 : 1985, IS 6623 : 1985 and IS 6649 : 1985 respectively.

What is K factor in bolt torque?

where T = torque, K = nut factor, sometimes called the friction factor, D = bolt diameter, and F = bolt tension generated during tightening. This expression is often called the short-form equation.

How much torque is required for tightening the cylinder head?

1. Tighten each bolt to 7-9 foot pounds of torque. 2, Tighten each bolt to 12-14 foot pounds of torque.

Should you tighten the nut or the bolt?

The answer depends on your application and the condition of the materials being fastened. In many situations you can apply torque to either the nut or the bolt head. Both will result in a tight connection and neither will avoid breakage more often (that occurrence can be avoided through other means).

Why do we use torque?

Torque is a crucial part of generating power from a car’s engine, as it represents the load an engine can handle to generate a certain amount of power to rotate the engine on its axis. … Multiply this torque force (in lb-ft.) by the axis’s rotational speed per minute (RPM) and you get the engine’s power output.

How do you torque a bolt without a torque wrench?

How to Get 18 Foot-Pounds Without a Torque WrenchMeasure the length of the box wrench in inches from ring-center to ring-center. … Divide 18 foot-pounds by the length of the wrench in feet and note the answer. … Tighten the bolt or nut by hand until it is finger-tight and then fit the wrench onto it. … Hook the spring balance into the free end of the wrench.More items…

How do you calculate torque?

A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.

How do you calculate torque settings?

Begin with the formula T = K x U x D x P, where T is the torque, K is a standard representing 1.33, U is the coefficient of friction, D is the diameter of the fasteners, and P is the necessary preload.

Can you over tighten U-bolts?

The threads on most u-bolts are rolled, not cut. Unlike cut threads, rolled threads are deformed when the u-bolts are first installed and tightened. The correct torque (clamping force) can never be achieved when reusing old u-bolts. … There’s a good reason not to over-torque ANY bolt!

How do you determine torque for tightening bolts?

The Bolt Torque Formula K is the coefficient of friction. Your coefficient will depend on the material of your bolt/nut, the type of lubrication (or, rarely, the lack of lubrication) and the size of the bolt. The nominal bolt diameter is d in this equation. It may be expressed in millimeters or inches.

Why do we need to torque bolts?

Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.

What are the torque specs for a 5’8 bolt?

US Recommended Bolt TorqueSizeRecommended TorqueGrade 218-8 S/S9/16″53575/8″73933/4″12512813 more rows

What is the torque for a 12mm bolt?

Metric Bolts Maximum Torque, in foot-pounds, for clean, dry threads Check your Shop Manual !Bolt sizeLow GradeGrade 8.86mm3-578mm8-121710mm15-223312mm39594 more rows