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Bolted Joint Calculator (Preload, Torque, Safety Factors)

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Bolted joint calculator from plain text: preload and tightening torque, bolt and joint stiffness, bolt load, safety against yield, separation, fatigue and slip, bolt length, and bolt sizing. Metric and inch, ISO, SAE and ASTM grades.

Pricing

Pay per event

Rating

0.0

(0)

Developer

Jumble Mog

Actor stats

Bookmarked

Total users

Monthly active users

2 days ago

Last modified

Categories

Automation

Developer tools

Security

Joints

joints

Optional

One joint per entry, as a line of text or an object. Give the bolt ('M12', 'M10x1.25', '1/2-13 UNC', '3/8 UNF', '#10-24') and grade ('8.8', '10.9', 'grade 5', 'A325', 'A2-70'), the clamped parts ('2 x 15 mm steel', '20 mm aluminum + 10 mm steel'), 'cap screws into cast iron' for a tapped hole, the bolt count and the loads ('10 kN per bolt', '60 kN total tension', '0 to 60 kN cyclic', '8 kN shear'). Optional: 'washers', 'lubricated' or 'zinc' (torque coefficient), 'friction 0.12' (VDI 2230 torque), 'preload 70%', 'torque 50 N·m', 'permanent' (90% preload), 'slip factor 0.3', 'safety 2'. Write 'design' (or leave out the size) to find the smallest bolt that works. Object fields: mode, size, grade, count, members (thickness with material or E), grip, tapped, tappedMaterial, load, minLoad, shear, perBolt, cyclic, preload, preloadPercent, torque, permanent, finish, friction, nutFactor, slipFriction, shearPlanes, safety, washer, length, units, title.

Type:array

Default grade

grade

Optional

For joints that don't name one, such as '8.8' or 'grade 5'. Otherwise 8.8 (metric) or SAE grade 5 (inch); design tries 8.8, 10.9 and 12.9 (or grades 5 and 8).

Type:string

Default finish

finish

Optional

Sets the torque coefficient K in T = K·F·d (Shigley Table 8-15).

Type:string

Options:

as receivedblackzinc platedlubricatedcadmiumanti-seizewaxed

Units

units

Optional

For numbers written without a unit. Inch threads and lbf switch to inch units on their own.

Type:string

Default:mm

Options:

mmin

Draw charts

charts

Optional

The joint diagram and the safety factors for each joint.

Type:boolean

Default:true

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