INDIAN RAILWAY STANDARD SPECIFICATION FORI.R.S.

FANGS, BOLTS
AND NUTS
Serial No. T 13-66.

0. FORWARD.

0.1 This specification is issued under fixed serial No. T 13, the final number indicates
the year of original adoption as standard, or in the case of revision, the year of last
revision

ADOPTED, 1937; REVISED, 1953, 1959, 1960, 1966.

0.2 This specification is revised to specify the material as per IS : specifications and

to fall in line with Indian standard practices to the extent possible.

1. SCOPE.

1.1 This specification covers the requirements of Fangs, Bolts and Nuts for use for
fastening the slide chairs and other track chairs to the sleepers.

BOLTS AND NUTS

2. MANUFACTURE

2.1 Materials- The bolts and nuts shall be manufactured from steel bars conforming
to IS :2 26-62 for "structural Steel ( Standard quality)".

2.2 Manufacturing Practice - The bolts and nuts shall conform the dimensions
shown on the drawings. The bolts heads shall be formed by upsetting the bar when
hot. They shall be concentric, square with the Shank and cleanly and properly finished
without or flash. The nuts shall be hot forged from the solid, the holes being truly
central, and the faces square with the axis of the holes. All screw threads shall be cut
to the standard dimensions of Indian Standard metric screw threads and the length of
the screwed portion of the fang bolt shall not be less than that shown on the drawings.

3. TESTS ON FINISHED BOLTS AND NUTS

3.1 Test by Chemical Analysis - The Contractors shall supply a complete

analysis of Each cast of steel when. required to do so by the Purchaser or the
Inspecting Officer. Samples shall also be taken by the Purchaser or the Inspecting
Officer for analysis from finished bolts and nuts and shall be subjected to complete
analysis, if necessary, at the expense of the Purchaser.
3.2 Physical test - From each batch of bolts and nuts, samples at the rate of 3 for
Each size and/or description--in each tonne or less of material ordered, shall be
selected by the Purchaser or the Inspecting Officer and subjected to the following tests
:-

3.2.1 Bolts :-

3.2.1. Tensile Test- Not less than 1 test bolt and not more than 1/10th of the Total
number of test bolts, if such total number is above 20, shall be selected for tensile test.
The bolts shall not be cut or machined for 1 the test, The heads shall engage loosely in
suitable support in the testing machine and the screwed portion of the shank shall
engage in grips of the ordinary type. The bolts of each size and type be subjected to
the tensile tests, The tensile Strength of the bolt shall not be less than 42 Kg. per mm.
square. In case the fracture occurs in the unscrew portion of the shank, the stress-shall
be calculated on the area based on the nominal diameter. When the fracture occurs in
the screwed portion, the stress calculated on the area given by the follow-

Area =  /4(Pitch Dia. + minor Dia)/2

3.2.1.2 Hot Bend Test - Half the number of the remaining test bolts or at the
discretion of the Purchaser or the Inspecting Officer such number not less than a
quarter, shall withstand, without fracture, being bent double, when hot, flat upon
themselves.

3.2.1.3 Cold Hammering Test - All the remaining test bolts or at the discretion of
the Purchaser or the Inspection Officer not less than a quarter shall be hammered cold
at the head until they are inclined 15 to 20º from the normal position without sign of
fracture at the junction of the head and the shank.

Note: when the bolts are inspected during manufacture, hot bend and cold
hammering tests may, at the Contractor's option, be made before screwing.

3.2.2 Nuts :-

3.2.2.1 Drifting Test - Half the number of the test nuts or at the discretion of the
Purchaser or the Inspecting Officer, such number not less than a quarter shall
withstand, without fracture drifting hot until the hole is 1.5 times the original
diameter.

3.2.2.2 Hammering Test - All the remaining test nuts or at the discretion of the
Purchaser or the Inspecting officer such number not less than a quarter, shall
withstand, without fracture, hammering hot so as to reduce the hole to 1.5 times its
original diameter.

4. RETESTS

4.1 For each test bolt or nut which fails, two additional bolts and nuts shall be
similarly Selected by the Purchaser or the inspecting officer and tested in the same
manner. If under this retest, more than 20% of the retest bolts and nuts fail, the batch
represented shall be rejected.

5. SCREWING TEST

5.1 Nuts shall fit the bolts without perceptible shake and the screwing must be such
that a man with a spanner not more than 300 mm. in length can, with one hand run the
nut upto 3 or 4 threads of that the screwing which is nearest to the head of a spanner
not more than 300 mm, in length can, with one hand run the nut upto. 3 or 4 threads of
that end the screwing which is nearest to the head of the bolt.

FANGS

6. MANUFACTURE

6.1 The fangs shall be manufactured from cost iron conforming to Grade 20 of IS :

210-62, Specification for "Grey Iron Castings."

6.2 Manufacturing Practice- The fangs shall be conformed to the dimensions

shown on the drawings and shall be properly and cleanly finished. The holes in the
fangs shall be central and the faces square with the axis of the hole. Any fangs
selected at random shall seat properly with any bolt, which shall also be selected at
random.

GENERAL

7. SAMPLE, FANGS, BOLTS AND NUTS

7.1 The Contractor shall submit to the Purchaser or the Inspecting officer, two
preliminary unoiled samples of bolts complete with fangs and nuts, and manufacture
in bulk shall not be proceeded with until these samples have been approved. The
screwing shall be checked by approved gauge, one sample being returned to the
contractor sealed to guide manufacturer. Such samples shall be made in dies and
machines with which general manufacturer will be carried out.
 8. MARKING

8.1 The flange, bolts and nuts shall be marked with the maker's initial/mark and I.R.S.
part no. Shown on the drawings.

9. INSPECTION

 9.1 The Inspecting Officer or the Purchaser shall have free access at all reasonable
times to the works in which fangs, bolts and nuts are manufactured. He shall be at
liberty to inspect the manufacture at any stage and to reject any material or fangs,
bolts and nuts that do not conform to the terms of this specification.

10. TOLERANCE OH weight

10.1 The tolerance on weight of the bolt complete with its fang and nut shall be  3
percent of the calculated weight.

11. TESTING FELICITIES

11.1 The contractor shall supply the material and the samples required for the testing
free of charge and shall, at his own cost, and furnish and prepare the necessary test
pieces and supply labour and appliance for such as may be carried out in his own
premises in accordance with this specification. Failing facilities at his own works for
making the prescribed tests, the Contractor shall bear the cost of carrying out tests
elsewhere.

12. PROTECTION

12.1 After inspection and approval, the fangs, bolts and nuts shall be dipped cold in
boiled linseed oil to IS:77-50 or in any other approved rust preventive compound and
shall not be packed until the oil has dried to an elastic film free from tackiness. Each
bolt shall be dipped complete with its fang and nut, which shall be screwed on for a
few threads.

13. PACKING

13.1 The bolts shall be packed complete with their fangs and nuts, which shall be
screwed on for a few threads, in suitable bags, so as to avoid any loss or damage to
them in the transit. No bag shall contain more than 50 Kg. or more one kind of bolts.