Standart Tightening Torque for construction bolt

Bolt Size mm	Pitch mm	Bolt Hex mm	Strength Grade (N-m)
			4.6	6.8	8.8	10.9	12.9
3	0.5	5.5	0.51	1.01	1.35	1.90	2.27
4	0.7	7	0.95	1.91	2.54	3.57	4.29
5	0.8	8	2.28	4.56	6.09	8.56	10.3
6	1.0	10	3.92	7.85	10.5	14.7	17.7
8	1.25	13	9.48	18.9	25.3	35.5	42.7
10	1.5	17	19.1	38.1	50.9	71.5	86.8
12	1.75	19	32.6	65.1	86.9	122	146
14	2.0	22	51.9	104	139	195	234
16	2.0	24	79.9	160	213	299	359
18	2.5	27	110	220	293	413	495
20	2.5	30	156	312	416	585	702
22	2.5	32	211	422	563	792	950
24	3.0	36	270	539	719	1010	1213
27	3.0	41	398	795	1060	1490	1789
30	3.5	46	540	1080	1440	2025	2430

The tools to measure torque call Torque wrench . that tool available buy at here :

Product Specifications

Part Number:	CEM360N3X22D
Item Package Quantity:	1

Item Dimensions
Weight:	2.5 Pounds
Length:	28.07 inches
Width:	2.26 inches
Height:	1.81 inches

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Technical Details

• Torque Range 72~360NM; Accuracy +/-1% of indicated value; 0.4 resolution
• CW & CCW testing directions; 999 Data Memory; Run/Peak Modes
• Includes QH22D 3/4" sq dr ratcheting head (removeable) {other head types sold separately}
• Includes Certificate of Calibration; Ni-MH rechargeable Battery Pack and Charger
• RS232 Port for downloading data; #584 USB cable sold separately

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Product Description

Industrial grade digital torque wrench ideal for performing retightening or loosening tests to confirm torque on fasteners. Captures and stores peak torque as well as time/date stamp. Tightening and Measuring modes. Other models ranges and units available from Tohnichi. Used by major automobile mfgrs.

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Product Details Product Dimensions: 28.1 x 2.3 x 1.8 inches ; 2.5 pounds Shipping Weight: 2.5 pounds (View shipping rates and policies) ASIN: B003MUNZ3O Item model number: CEM360N3X22D Average Customer Review: Be the first to review this item

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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