Brass Hex Cap Screw
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Brass Hex Cap Screw

Brass hex head cap screws are manufactured from an alloy of copper and zinc. Dimensional specifications are governed by ASME B18.2.1. There are no grade markings on Brass hex cap screws. Brass fasteners are commonly used by electrical and communications industries, builders hardware and some marine applications. Brass hex head cap screws are electrically conductive, non-magnetic, and have good corrosion resistance.

Governing StandardsBrass

ASME B18.2.1 Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Brass Head Marking
Brass requires no material marking

Dimensional SpecificationsBrass

Finished bolt and cap screw dimensions
Per ASME B18.2.1-2012
Nominal
Diameter
UNC UNF E F G H J LT Y
Body Diameter Width Across Flats Width Across
Corners
Head Height Wrench
Height
Thread Length Transition
Length
Max Min Basic Max Min Max Min Basic Max Min Min Lengths
up to 6"
Lengths
> 6"
Max
1/4 0.2500 20 28 0.2500 0.2405 7/16 0.4380 0.4280 0.5050 0.4880 5/32 0.1630 0.1500 0.1060 0.7500 1.0000 0.2500
5/16 0.3125 18 24 0.3125 0.3065 1/2 0.5000 0.4890 0.5770 0.5570 13/64 0.2110 0.1950 0.1400 0.8750 1.1250 0.2750
3/8 0.3750 16 24 0.3750 0.3690 9/16 0.5620 0.5510 0.6500 0.6280 15/64 0.2430 0.2260 0.1600 1.0000 1.2500 0.3120
7/16 0.4375 14 20 0.4375 0.4305 5/8 0.6250 0.6120 0.7220 0.6980 9/32 0.2910 0.2720 0.1950 1.1250 1.3750 0.3570
1/2 0.5000 13 20 0.5000 0.4930 3/4 0.7500 0.7360 0.8660 0.8400 5/16 0.3230 0.3020 0.2150 1.2500 1.5000 0.3850
9/16 0.5625 12 18 0.5625 0.5545 13/16 0.8120 0.7980 0.9380 0.9100 23/64 0.3710 0.3480 0.2500 1.3750 1.6250 0.4170
5/8 0.6250 11 18 0.6250 0.6170 15/16 0.9380 0.9220 1.0830 1.0510 25/64 0.4030 0.3780 0.2690 1.5000 1.7500 0.4550
3/4 0.7500 10 16 0.7500 0.7410 1 1/8 1.1250 1.1000 1.2990 1.2540 15/32 0.4830 0.4550 0.3240 1.7500 2.0000 0.5000
7/8 0.8750 9 14 0.8750 0.8660 1 5/16 1.3120 1.2850 1.5160 1.4650 35/64 0.5630 0.5310 0.3780 2.0000 2.2500 0.5560
1 1.0000 8 14 1.0000 0.9900 1 1/2 1.5000 1.4690 1.7320 1.6750 39/64 0.6270 0.5910 0.4160 2.2500 2.5000 0.6250
1 1/8 1.1250 7 12 1.1250 1.1140 1 11/16 1.6880 1.6310 1.9490 1.8590 11/16 0.7180 0.6580 0.4610 2.5000 2.7500 0.7140
1 1/4 1.2500 7 12 1.2500 1.2390 1 7/8 1.8750 1.8120 2.1650 2.0660 25/32 0.8130 0.7490 0.5300 2.7500 3.0000 0.7140
1 3/8 1.3750 6 12 1.3750 1.3630 2 1/16 2.0620 1.9940 2.3820 2.2730 27/32 0.8780 0.8100 0.5690 3.0000 3.2500 0.8330
1 1/2 1.5000 6 12 1.5000 1.4880 2 1/4 2.2500 2.1750 2.5980 2.4800 15/16 0.9740 0.9020 0.6400 3.2500 3.5000 0.8330
  1. All dimensions are in inches.
  2. Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″
Brass Hex Cap Screw
View
Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM
1/4 20 3/8 Full HHBR0250037 In Stock $0.2452/EA EA
1/4 20 1/2 Full HHBR0250050 In Stock $0.46747/EA EA
1/4 20 3/4 Full HHBR0250075 In Stock $0.64884/EA EA
1/4 20 1 Full HHBR0250100 In Stock $0.69886/EA EA
1/4 20 1 1/4 Partial HHBR0250125 In Stock $0.6794/EA EA
1/4 20 1 1/2 Partial HHBR0250150 In Stock $0.44953/EA EA
1/4 20 3 Partial HHBR0250300 In Stock $1.92072/EA EA
5/16 18 1/2 Full HHBR0310050 In Stock $0.64077/EA EA
5/16 18 3/4 Full HHBR0310075 In Stock $0.40048/EA EA
5/16 18 1 Full HHBR0310100 In Stock $1.16808/EA EA
5/16 18 1 1/4 Full HHBR0310125 In Stock $0.60072/EA EA
5/16 18 1 1/2 Partial HHBR0310150 In Stock $0.56067/EA EA
3/8 16 1/2 Full HHBR0370050 In Stock $1.06651/EA EA
3/8 16 3/4 Full HHBR0370075 In Stock $1.28355/EA EA
3/8 16 1 Full HHBR0370100 In Stock $1.61816/EA EA
3/8 16 1 1/4 Full HHBR0370125 In Stock $1.54811/EA EA
3/8 16 1 1/2 Full HHBR0370150 In Stock $1.74543/EA EA
3/8 16 1 3/4 Partial HHBR0370175 In Stock $2.75418/EA EA
3/8 16 2 Partial HHBR0370200 In Stock $0.67235/EA EA
1/2 13 3/4 Full HHBR0500075 In Stock $2.46827/EA EA
1/2 13 1 Full HHBR0500100 In Stock $2.82087/EA EA
1/2 13 1 1/4 Full HHBR0500125 In Stock $3.06425/EA EA
1/2 13 1 1/2 Full HHBR0500150 In Stock $3.95691/EA EA
1/2 13 1 3/4 Full HHBR0500175 In Stock $1.51622/EA EA
1/2 13 2 Partial HHBR0500200 In Stock $1.622/EA EA
1/2 13 2 1/4 Partial HHBR0500225 In Stock $5.83149/EA EA
1/2 13 2 1/2 Partial HHBR0500250 In Stock $3.54372/EA EA
5/8 11 1 3/4 Full HHBR0620175 In Stock $10.5706/EA EA
5/8 11 2 1/2 Partial HHBR0620250 In Stock $10.53561/EA EA
5/8 11 2 3/4 Partial HHBR0620275 In Stock $3.80398/EA EA
5/8 11 3 Partial HHBR0620300 In Stock $14.18047/EA EA
5/8 11 3 1/2 Partial HHBR0620350 In Stock $4.62646/EA EA
5/8 11 4 Partial HHBR0620400 In Stock $8.39616/EA EA
5/8 11 4 1/2 Partial HHBR0620450 In Stock $5.82591/EA EA