HSS Nut & Bolt

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Table 1 : P.F. Range of High Strength Structural Fasteners

Product	Specification	Size	Threads	Mechanical Properties
High Strength Structural Bolts	ISO: 7412 IS : 3757	M16 to M36	Metric Coarse: 6g ISO: 261, ISO: 965 IS: 4218	Property Class 8.8 or 10.9 ISO: 898/1 IS: 1367, Part 3
High Strength Structural Nuts	ISO: 4775 IS : 6623	M16 to M36	Metric Coarse: 6H ISO: 261, ISO: 965 IS: 4218	Property class 8 or 10 ISO: 898/2 IS: 1367, Part 6
Hardened and Tempered Washers	ISO:7415 IS : 6649	M16 to M36 (Pain Hole, Circular)	-	Hardness HRC 35 - 45

P.F. High Strength Structural Fasteners:

These are large series hexagon bolts nuts and washers available in the range shown in Table 1.

The bolts are having short thread lengths, suitable for use in both friction type and bearing type structural steel joints.

P.F. High Strength structure Bolts, Nuts and Washers in Friction Grip Joints:

The use of high strength structural fasteners in friction grip joints has been one of the most important developments in structural engineering over the last about four decades.

It provides a simple method of transmitting loads through a structural joint by the friction on the contact face developed through the high clamping force from correctly tightened high strength bolts and nuts.

The bolts are fitted in clearance holes and since the joint is designed to resist slip, they are not subject to bearing or shear forces and thus remain in virtually static tension throughout their working life, with fluctuating loads having very little, if any, effect on bolt stress.

The head dimensions (across flat sizes) of H.S.S. Bolts and Nuts are one step higher than those of the normal hexagon bearing pressure under the head of H.S.S. Bolts will thus be necessarily lower than that of the conventional hexagon head bolts.

Indentation of the hard bolt head into softer structural steel in therefore prevented.

P.F. High strength structural fasteners in friction grip joints are ideal for use on time-bound projects. Over the conventional methods of riveting or welding, they offer the following advantages:

Reliability:

Once tightened, the bolts will remain tight and maintain the permanent strength of the joint. Absence of heavy stress concentration due to absence of bearing between bolts and plates. As bolts are in tension, it does not permit loosening, thus making it most ideal where vibrations are involved.

Economy:

Fewer high strength bolts are required than M.S. Bolts and rivets. Drilling of close tolerance holes is not required. Overall weight of the structure will be very light.

Simplicity:

A minimum of skill is required in tightening and the operators need only to follow a few simple rules.

Convenience:

Whether in the workshop or at site, H.S.S. Bolts enable joints to be made easily. Welding of site splices can be eliminated, avoiding the difficulties of welding in adverse weather conditions. Absence of pneumatic hammers used in riveted joints reduce noise level considerably.

Table 2 : P.F. High Strength Structural Bolts Dimensions

Thread Size		M16	M20	(M22)	M24	(M27)	M30	M36
Pitch		2.0	2.50	2.50	3.00	3.00	3.50	4.00
B	Max.	16.70	20.84	22.84	24.84	27.84	30.84	37.00
B	Min.	15.30	19.16	21.16	23.16	26.16	29.16	35.00
da	Max.	18.70	23.24	25.24	27.64	30.40	33.40	39.40
W	Max.	27.00	34.00	36.00	41.00	46.00	50.00	60.00
W	Min.	26.16	33.00	35.00	40.00	45.00	49.00	58.80
C	Min.	29.56	37.29	39.55	45.20	50.85	55.37	66.44
H	Max.	10.75	13.40	14.90	15.90	17.90	19.75	23.55
H	Min.	9.25	11.60	13.10	14.10	16.10	17.65	21.45
R	Min.	0.60	0.80	0.80	1.00	1.20	1.20	1.50
T	T1 Ref.	31	36	38	41	44	49	56
T	T2 Ref.	38	43	45	48	51	56	63

Table 3 : P.F. High Strength Structural Nuts Dimensions

Thread Size		M16	M20	(M22)	M24	(M27)	M30	M36
Pitch		2.0	2.50	2.50	3.00	3.00	3.50	4.00
W	Max.	27.00	34.00	36.00	41.00	46.00	50.00	60.00
W	Min.	26.16	33.00	35.00	40.00	45.00	49.00	58.80
C	Min.	29.56	37.29	39.55	45.20	50.85	55.37	66.44
H	Max.	17.10	20.70	23.60	24.20	27.60	30.70	36.60
H	Min.	16.40	19.40	22.30	22.90	26.30	29.10	35.00
Weight Kg./ 1000 Pgs.		60.4	115.3	142.8	197.7	282.3	365.0	281.8

Table 4 : Grip Lengths and Weight of Bolts (Kgs per 1000 pcs.)

Dia	M16		M20		(M22)		M24		(M27)		M30		M36
L	GI	Wt.	GI	Wt.	GI	Wt.	GI	Wt.	GI	Wt.	GI	Wt.	GI	Wt.
40	10 to 14	102.8
45	15 to 19	110.7	11 to 15	180.3
50	20 to 24	118.6	16 to 20	192.6	12 to 16	252.0
55	25 to 29	126.5	21 to 25	205.0	17 to 21	266.9	15 to 19	337.4
60	30 to 34	134.4	26 to 30	217.3	22 to 26	281.8	20 to 24	352.2	17 to 21	480.9
65	35 to 39	142.3	31 to 35	229.6	27 to 31	296.7	25 to 29	372.9	22 to 26	503.4
70	40 to 44	150.2	36 to 40	241.9	32 to 36	311.6	30 to 34	390.7	27 to 31	525.8	24 to 28	672.5
75	45 to 49	158.1	41 to 45	254.3	37 to 41	326.6	35 to 39	408.4	32 to 36	548.3	2933	700.3	23 to 27	1089.1
80	50 to 54	166.0	46 to 50	266.6	42 to 46	341.5	40 to 44	426.2	37 to 41	570.8	3038	728.0	28 to 32	1129.0
85	55 to 59	173.9	51 to 55	278.9	47 to 51	356.4	45 to 49	443.9	42 to 46	593.2	3943	755.7	33 to 37	1169.0
90	60 to 64	181.7	56 to 60	291.3	52 to 56	371.3	50 to 54	461.7	47 to 51	615.7	4448	783.5	38 to 42	1209.0
95	65 to 69	189.6	61 to 65	303.6	57 to 61	386.2	55 to 59	479.4	52 to 56	638.2	4953	811.2	43 to 47	1248.9
100	70 to 74	197.5	66 to 70	315.9	62 to 66	401.2	60 to 64	497.2	57 to 61	660.7	5458	839.0	48 to 52	1288.9
110	75 to 84	211.4	71 to 80	337.7	67 to 76	427.8	65 to 74	528.5	62 to 71	685.6	5968	888.4	53 to 62	1362.0
120	85 to 94	227.2	81 to 90	362.4	77 to 86	457.7	75 to 84	564.1	72 to 81	730.6	6978	943.9	63 to 72	1441.9
130	95 to 104	243.0	91 to 100	387.0	87 to 96	487.5	85 to 94	599.6	82 to 91	775.5	7988	999.4	73 to 82	1521.8
140	105 to 114	258.8	101 to 110	411.7	97 to 106	517.3	95 to 104	635.1	92 to 101	820.5	8998	1054.9	83 to 92	1601.7
150	115 to 124	274.6	111 to 120	439.3	107 to 116	547.2	105 to 114	670.6	102 to 111	865.4	99108	1110.4	93 to 102	1681.6
160	125 to 134	290.3	121 to 130	461.0	117 to 126	577.0	115 to 124	706.1	112 to 121	910.4	109118	1165.8	103 to 112	1761.5
170	135 to 144	306.1	131 to 140	485.7	127 to 136	606.9	125 to 134	741.6	122 to 131	955.3	119128	1121.3	113 to 122	1841.4
180	145 to 154	321.9	141 to 150	510.3	137 to 146	636.7	134 to 144	777.1	132 to 141	1000.2	129138	1276.8	123 to 132	1921.3
190	155 to 164	337.7	151 to 160	535.0	147 to 156	666.5	145 to 154	812.6	142 to 151	1045.2	139148	1332.3	133 to 142	2001.2
200	165 to 174	353.5	161 to 170	559.6	157 to 166	694.4	155 to 164	848.2	152 to 161	1090.2	149158	1387.8	143 to 152	2081.1
210									162 to 171	1135.2	159168	1443.3	153 to 162	2161.0
220									172 to 181	1180.1	169178	1498.8	163 to 172	2240.9
230									182 to 191	1225.0	179188	1554.3	173 to 182	2320.8
240									192 to 201	1270.0	189198	1609.8	183 to 192	2400.7
250									202 to 211	1314.0	199208	1665.3	193 to 202	2480.6
260									212 to 221	1359.9	209218	1720.7	203 to 212	2560.5
270									222 to 231	1404.9	219228	1776.2	213 to 222	2640.4
280									232 to 241	1449.8	229238	1831.7	223 to 232	2720.3
290									242 to 251	1493.9	239248	1887.2	233 to 242	2800.2
300									252 to 261	1538.9	249258	1942.7	243 to 252	2880.1