Formula Tightening Torque

Relation Formula Between Bolt and Tightening Torque

A tightened body tightening force stabilization agent capable of

minimizing a variation in torque coefficient suitable for controlling

a tightened body tightening force by a torque method, comprising

, as an active ingredient, a polymer of unsaturated chain hydrocarbon

with a carbon quantity of four; a method for stabilization of tightened

body tightening force, comprising the steps of applying the polymer to

at least either of a thread part such as a bolt member and a washer

and the threaded part or seat surface of the tightened body and

performing a tightening operation.

T=kdF
K=1/2{(d₁/d)tan(θ'+β)+(d₂/d)}≒0.2
θ'=tan^-1μ₁/(cosα/2)

T: Tightening torque --------------------N-m
K: Torque coefficient
d: Normal bolt size ----------------------mm
F: Axial tension -------------------------N
d₁: Pitch diameter -----------------------mm
d₂: Pitch diameter ofunder head ---------mm
μ₁: Thread friction coeffcient
μ₂: Underhead friction coefficient
α: Half angle of screw thread
β: Lead angle
θ': Angle off riction svrew thread

Shopping Bolt / Fastener available here :

Torque wrench (tools what can measure bolt's torque) available buy at here :

Technical Details

• Hardened Alloy Steel Handle
• Reversible Drive, Forged Chrome Vanadium Steel Ratchet Head
• Corrosion-Resistant Chrome Plated Finish
• Locking Micrometer Torque Adjustment with Non-Slip Knurled Grip
• Wrench Clicks when Torque Setting is Reached

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Product Description

From the Manufacturer

Hardened Alloy Steel Handle, Reversible Drive, Forged Chrome Vanadium Steel Ratchet Heat, Corrosion-Resistant Chrome Plated Finish, Locking Micrometer Torque Adjustment with Non-Slip Knurled Grip, Wrench Clicks when Torque Setting is Reached, Meets or Exceeds Federal Specification GGG-W00686C, Specifications:, Ratchet: CR-V, 45 Tooth, Length: 10.

Product Description

MIT 3/8"-DRIVE CLICK TORQUE WRENCH KIT features: Chrome Plated Alloy Steel Construction, Micrometer Adjusting, Reversible Ratcheting Lock Holds Torque Setting, No Pointer or Dial to Monitor - Wrench Clicks when Pre-set Torque is Reached, Sealed Mechanism for Greatest Accuracy, Longer Calibration, Complete with Conversion Table Chart, Professional Quality, Dual Scale Torque Range: 120-960 Inch/Lbs. 1.4-11.1 MKG. 1-pc. 3/8"-Dr. Click Torque Wrench Kit, 1-pc. 3/8"-Dr. (F) x 1/2 Dr. (M) Adapter, 1-pc. Molded Plastic Storage Case