This Indian Standard (Part 1) (Fourth Revision) which is identical with ISO 4014:1999 'Hexagon head bolts—Product grades A and B issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Bolts, Nuts and Fasteners Accessories Sectional
i) Bolts of property class 8.8 and 19.9 as covered in IS 3757 : 1958 'High strength structural bolts ( second revision )' have been specified. ii) In addition to friction type joints, joints subjected to tensile force only in the direction of the bolt axis and bearing type joints have been covered.
IS 1367-3: Technical Supply Conditions for Threaded Steel Fasteners, Part 3: Mechanical Properties of Fasteners Made of Carbon Steel and Alloy Steel - Bolts, Screws and Studs.
IS 1363 (Part 1):2019 /ISO 4016:2011 specifies the characteristics of Hexagon Head Bolts with thread size from M5 upto and including M64 of product grade C. Also Bolts may be of different property classes as specified in IS 1363 (Part 1): 2019 / ISO 4016:2011.
IS 1367-6: Technical Supply Conditions for Threaded Steel Fasteners, Part 6: Mechanical Properties and Test Methods for Nuts with Specified Proof Loads.
This part of ISO 898 applies to bolts, screws and studs — — — — — with coarse pitch thread Ml,6 to M39, and fine pitch thread M8 X 1 to M39 X 3; with triangular ISO thread in accordance with ISO 68-1; with diameter/pitch combinations in accordance with ISO 261 and 1S0 262; with thread tolerance in accordance with ISO
IS 1367, Part 14: Stainless steel threaded fasteners. This standard covers the requirements of bolts, screws, studs and nuts made from austenitic, ferritic and martensitic grades of corrosion – resistant stainless steels for nominal thread diameters from 1.6 up to 39 mm.
IS 12427:2001 specifies the requirements for hot-dip galvanized Hexagon Head Transmission Tower Bolts with thread size range from M 12 to M 24 with Property Class 5.6, 5.8 and 8.8. The Firm shall declare the varieties of Bolts they intend to cover in the Licence.
IS 1364 was originally published in 1960 and first revised in 1967. The Committee also decided to publish Indian Standard on 'Hexagon nuts, Style 2 — Product grades A and B' as Part 6 of IS 1364. The Part 6 will supersede lS/lSO 4033:1979 on its publication.
Type C studs, made from steel, shall conform to property classes 4.6, 6.6 and 8.8 of IS : 1367 - 1967. General Requirements - In regard to requirements not covered in this standard, the studs shall comply with the requirements of IS : 1367-1967.
'This Indian Standard ( Fourth Revision ) which is identical with ISO 2009 :1994 'Slotted countersunk flat head screws ( common head style ) — Product grade A' issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendations of the Bolts, Nuts and
The aim of this part of ISO 3506 is a classification into property classes of corrosion resistant stainless steel fasteners. Some materials can be used at temperatures down to -200 'C, some can be used at temperatures up to +800 “C in air.
The standard specifies property class 4.6 for foundation bolts as the bolts are generally used with this property class. In preparation of this standard assistance has been derived from DIN 529-1986 'Masonry and foundation bolts' issued by Deutsches Institut fiir Normung ( DIN).
This International Standard specifies the characteristics of hexagon bolts with flange, small series, of product grade A, with threads from M5 up to and including M16, and property classes 8.8, 9.8, 10.9 and A2-70.
IS 2269: Hexagon Socket Head Cap Screws : Bureau of Indian Standards : Free Download, Borrow, and Streaming : Internet Archive.
Measure the distance across the flat sides of the bolt head using the vernier caliper. This measurement will give the size of wrench you would need to unfasten or tighten this bolt. Use inches for standard bolts and millimeters for metric bolts.
How to Read Screw Sizes
- Read the first letter of the size. This the largest diameter: the measurement of the screw on the thread.
- Read the second number. This is either the number of threads per unit of the distance between threads; also known as the "thread pitch".
- Read the third number, generally the one following the "x."
For identification purposes, hydraulic tube fittings and connectors can be divided into six different thread types: UN/UNF, NPT/NPTF, BSPP (BSP, parallel), BSPT (BSP, tapered), metric parallel, and metric tapered. Three are parallel (UN/UNF, BSPP, metric parallel) and three are tapered (NPT/NPTF, BSPT, metric tapered).
Hex key standard sizes. Hex keys are measured across-flats (AF), which is the distance between two opposite (parallel) flat sides of the key. Damage to the fastener or the tool can result from using a hex wrench that is too small for the socket, for example a 5 mm tool used in a 5.5 mm socket.
The nut takes a
13mm spanner, (which suggests M8), the length of the whole thing is approx. 25mm, and the threaded bit is approx. 21mm. The outside diameter of the threads is approx.
What size bolt fits a 12mm socket?
| Bolt size | Size | Tolerance |
|---|
| 12mm | 12.30 |
| 5/16"UNF | 1/2" | 13.00 |
| M8 | 13mm | 13.30 |
| 1/4"BSW | 13.64 |
SAE nuts, bolts and screws are measured by their thread count, or TPI (threads per inch) and their length. Metric fasteners are measured by length and pitch, or the distance between threads.
I believe that the bold that goes with the 15mm wrench is normally an M8. M8s usually use 12 or
13mm heads. Regarding this, what size nut fits a 12mm socket?
What size nut fits a 15mm socket?
| Bolt Diameter (mm) | Head/Wrench Size (mm) |
|---|
| ANSI/ISO | DIN/ISO Heavy Hex |
|---|
| 14 | 21 | - |
| 16 | 24 | 27 |
How to Determine the Right Size Socket for a Nut
- Turn on the digital caliper and set it to read in inches, not millimeters. Set the nut on a flat surface.
- Close the caliper jaws until each jaw rests on one flat side of the nut on opposite sides.
- Check the caliper display. The reading shows the size of the nut as a decimal.
Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts. See our nut compatibility chart to determine the compatible heavy hex nut(s) for a specific grade of bolt.
Class 8. This is a metric nut grading similar to the SAE grade 5 classification, which is used in conjunction with Class 8.8 bolts. This is a medium strength nut.
Many fasteners (
screws, etc.), especially smaller sizes, are typically not graded—their strength isn't specified.
Table 1.
| Grade/Class | Strength |
|---|
| Metric Class 8.8 | Similar to Grade 5. |
| Metric Class 10.9 | Similar to Grade 8. |
| Metric Class 12.9 | The highest metric class for strength, it exceeds Grade 8. |
12.9 grade steel has 120% of the tensile strength of 10.9 grade steel. The "12" prefix indicates a tensile strength of X100 N/mm^2 and the "9" suffix indicates a multiplier. Both 12.9 and 10.9 have the same multiplier, so the comparison is straightforward: 12 to 10.
The minimum ultimate tensile strength of the Grade 12.9 Metric Hex Head Bolts is about 1242 Mpa or 180,000 PSI, making them the highest grade of bolts produced.In fact, the Grade 12.9 Nuts is known for their high tensile strength.
Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.
Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.
With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. It is also quenched and tempered at 800 F leading to its strength. The preload or thread tension in a fastener is higher with Grade 8 quality steel.
