Countersunk Bolt Grade 10.9 Loading Capacities Table

See Explanatory notes given below table. BS 5950-1: 2000 BS 4190: 2001, BS 4933

Countersunk Bolt Loading Capacities Grade 10.9 Table

Non-Preloaded Countersunk Bolts
Grade 10.9 Countersunk Bolts material S355

Diameter of Bolt mm	Tensile Stress Area A t mm²	Tension Capacity		Shear Capacity		Bearing Capacity in kN (Minimum of P_bb and P_bs ) End distance equal to 2 x bolt diameter Thickness in mm of material passed through
Diameter of Bolt mm	Tensile Stress Area A t mm²	Nominal 0.8 A_t p_t P nom kN	Exact A_t p_t P_t kN	Single Shear P_s kN	Double Shear 2 P_s kN	5	6	7	8	9	10	12	15	20	25	30
12	84.3	47.2	59.0	33.7	67.4	13.2	19.8	26.4	33.0	39.6	46.2	59.4	79.2	112	145	178
16	157	87.9	110	62.8	126	8.80	17.6	26.4	35.2	44.0	52.8	70.4	96.8	141	185	229
20	245	137	172	98.0	196	0	11.0	22.0	33.0	44.0	55.0	77.0	110	165	220	275
22	303	170	212	121	242	0	6.05	18.2	30.3	42.4	54.5	78.7	115	175	236	296
24	353	198	247	141	282	0	0	13.2	26.4	39.6	52.8	79.2	119	185	251	317
27	459	257	321	184	367	0	0	3.71	18.6	33.4	48.3	78.0	123	197	271	345
30	561	314	393	224	449	0	0	0	8.25	24.8	41.3	74.3	124	206	289	371

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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