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Grade 8.8 Bolt Loading Capacities Table

Engineering ISO Metric Hardware Design Data
Engineering ANSI Hardware Design Data

See Explanatory notes given below table. BS 5950-1: 2000 BS 4190: 2001

Bolt Loading Capacities. Non-preloaded Ordinary Bolts. Grade 8.8 Bolts per. S355

Diameter of Bolt	Tensile Stress Area At	Tension Capacity		Shear Capacity		Bearing Capacity in kN (Minimum of Pbb and Pbs) End distance equal to 2 x bolt diameter Thickness in mm of material passed through
		Nominal 0.8 At pt	Exact At pt	Single Shear	Double Shear
		Pnom	Pt	Ps	2 Ps
mm	mm2	kN	kN	kN	kN	5	6	7	8	9	10	12	15	20	25	30
12	84.3	37.8	47.2	31.6	63.2	33.0	39.6	46.2	52.8	59.4	66.0	79.2	99.0	132	165	198
16	157	70.3	87.9	58.9	118	44.0	52.8	61.6	70.4	79.2	88.0	106	132	176	220	264
20	245	110	137	91.9	184	55.0	66.0	77.0	88.0	99.0	110	132	165	220	275	330
22	303	136	170	114	227	60.5	72.6	84.7	96.8	109	121	145	182	242	303	363
24	353	158	198	132	265	66.0	79.2	92.4	106	119	132	158	198	264	330	396
27	459	206	257	172	344	74.3	89.1	104	119	134	149	178	223	297	371	446
30	561	251	314	210	421	82.5	99.0	116	132	149	165	198	248	330	413	495

Non-preloaded Ordinary Bolts

• Values in bold are less than the single shear capacity of the bolt.
• Values in italic are greater than the double shear capacity of the bolt.
• Bearing values assume standard clearance holes.
• If oversize or short slotted holes are used, bearing values should be multiplied by 0.7.
• If long slotted or kidney shaped holes are used, bearing values should be multiplied by 0.5.
• If appropriate, shear capacity must be reduced for large packings, large grip lengths and long joints.

The tensile stress area (A_t ) is obtained from standards

The tension capacity of the bolt is given by:

P_nom = 0.8p_tA_t Nominal

P_t = p_tA_t Exact

Where:

p_t is the tension strength of the bolt.

The shear capacity of the bolt is given by

P_S = p_s A_s

where:

p_s is the shear strength of the bolt
A_s is the shear area of the bolt.

In the table, As has been taken as equal to At .

The shear capacity given in the tables must be reduced for large packings, large grip lengths, kidney shaped slots or long joints when applicable.

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