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Combination Slotted Truss Head Screws，Type III

ASME B 18.6.3 (T26-III) - 2013

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Thread Size
d

10#

12#

d	Nominal Size
PP
n	max
	min
t	max
	min
M	Ref.
Socket No.
P	max
	min
d_k	max
	min
k	max
	min
R	max

0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160
56	48	40	40	32	/	32	24	24
0.031	0.035	0.039	0.043	0.048	0.048	0.054	0.060	0.067
0.023	0.027	0.031	0.035	0.039	0.039	0.045	0.050	0.056
0.031	0.036	0.040	0.045	0.050	0.054	0.058	0.068	0.077
0.020	0.023	0.027	0.030	0.033	0.037	0.040	0.048	0.055
0.050	0.070	0.070	0.091	0.091	0.091	0.112	0.112	0.133
00	0	0	1S	1S	1S	2S	2R	3S
0.033	0.038	0.038	0.055	0.055	0.055	0.063	0.075	0.080
0.028	0.028	0.028	0.040	0.040	0.040	0.048	0.060	0.065
0.194	0.226	0.257	0.289	0.321	0.352	0.384	0.448	0.511
0.180	0.211	0.241	0.272	0.303	0.333	0.364	0.425	0.487
0.053	0.061	0.069	0.078	0.086	0.094	0.102	0.118	0.134
0.044	0.051	0.059	0.066	0.074	0.081	0.088	0.103	0.118
0.129	0.151	0.169	0.191	0.211	0.231	0.254	0.283	0.336

Thread Size
d

14#

1/4

16#

18#

5/16

20#

24#

3/8

d	Nominal Size
PP
n	max
	min
t	max
	min
M	Ref.
Socket No.
P	max
	min
d_k	max
	min
k	max
	min
R	max

0.2420	0.2500	0.2680	0.2940	0.3125	0.3200	0.3720	0.3750
/	20	/	/	18	/	/	16
0.075	0.075	0.075	0.084	0.084	0.084	0.094	0.094
0.064	0.064	0.064	0.072	0.072	0.072	0.081	0.081
0.085	0.087	0.093	0.100	0.106	0.108	0.123	0.124
0.063	0.063	0.069	0.075	0.076	0.082	0.087	0.090
0.133	0.133	0.191	0.191	0.191	0.191	0.191	0.191
3S	3S	4R	4R	4R	4R	4R	4R
0.080	0.080	0.100	0.100	0.100	0.100	0.100	0.100
0.065	0.065	0.085	0.085	0.085	0.085	0.085	0.085
0.557	0.573	0.609	0.661	0.698	0.713	0.817	0.823
0.530	0.546	0.580	0.630	0.666	0.680	0.780	0.787
0.146	0.150	0.159	0.173	0.183	0.186	0.213	0.215
0.129	0.133	0.141	0.153	0.162	0.165	0.190	0.191
0.375	0.375	0.410	0.446	0.457	0.484	0.557	0.538

①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating.
③,“R" in the recess size tabulation means regular depth recess, and "S" means short depth recess.
④,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only.

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