Silicon Bronze Hex Cap Screw
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Silicon Bronze Hex Cap Screw

Silicon Bronze hex head cap screws are fasteners manufactured from Alloy 651 or Alloy 655. Dimensional specifications are governed by ASME B18.2.1. There are no grade markings on Silicon Bronze hex cap screws. They are commonly used in general construction, refineries, and the power and energy industry. Non-magnetic and electrically conductive, these fasteners are best known for their corrosion resistance. Silicon Bronze cap screws are significantly stronger than brass.

Governing StandardsSilicon Bronze

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.

Silicon Bronze Marking
Silicon Bronze requires no material marking

Dimensional SpecificationsSilicon Bronze

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″
Silicon Bronze Hex Cap Screw
View
Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM
1/4 20 1/2 Full HHSB0250050 In Stock $0.53126/EA EA
1/4 20 3/4 Full HHSB0250075 In Stock $0.61655/EA EA
1/4 20 1 Full HHSB0250100 In Stock $0.68136/EA EA
1/4 20 1 1/4 Full HHSB0250125 In Stock $0.73747/EA EA
1/4 20 1 1/2 Full HHSB0250150 In Stock $1.19567/EA EA
1/4 20 2 Full HHSB0250200 In Stock $1.934/EA EA
5/16 18 1/2 Full HHSB0310050 In Stock $0.60072/EA EA
5/16 18 3/4 Full HHSB0310075 In Stock $1.02243/EA EA
5/16 18 1 Full HHSB0310100 In Stock $1.0012/EA EA
5/16 18 1 1/4 Full HHSB0310125 In Stock $1.29848/EA EA
5/16 18 1 1/2 Full HHSB0310150 In Stock $1.82791/EA EA
5/16 18 2 Full HHSB0310200 In Stock $1.86992/EA EA
3/8 16 1/2 Full HHSB0370050 In Stock $1.43213/EA EA
3/8 16 3/4 Full HHSB0370075 In Stock $1.2492/EA EA
3/8 16 1 Full HHSB0370100 In Stock $1.65317/EA EA
3/8 16 1 1/4 Full HHSB0370125 In Stock $2.09662/EA EA
3/8 16 1 1/2 Full HHSB0370150 In Stock $2.60871/EA EA
3/8 16 1 3/4 Full HHSB0370175 In Stock $2.20863/EA EA
3/8 16 2 Full HHSB0370200 In Stock $2.58145/EA EA
3/8 16 2 1/2 Full HHSB0370250 In Stock $2.76507/EA EA
3/8 16 3 Full HHSB0370300 In Stock $3.79813/EA EA
3/8 16 3 1/2 Full HHSB0370350 In Stock $0.00778/EA EA
3/8 16 4 Full HHSB0370400 In Stock $9.07557/EA EA
7/16 14 1 Full HHSB0430100 In Stock $4.48336/EA EA
7/16 14 1 1/2 Full HHSB0430150 In Stock $5.83905/EA EA
1/2 13 3/4 Full HHSB0500075 In Stock $2.46827/EA EA
1/2 13 1 Full HHSB0500100 In Stock $2.47927/EA EA
1/2 13 1 1/4 Full HHSB0500125 In Stock $3.29598/EA EA
1/2 13 1 1/2 Full HHSB0500150 In Stock $3.0634/EA EA
1/2 13 1 3/4 Full HHSB0500175 In Stock $3.42377/EA EA
1/2 13 2 Full HHSB0500200 In Stock $3.28632/EA EA
1/2 13 2 1/4 Full HHSB0500225 In Stock $5.32638/EA EA
1/2 13 2 1/2 Full HHSB0500250 In Stock $6.40028/EA EA
1/2 13 2 3/4 Full HHSB0500275 In Stock $7.39432/EA EA
1/2 13 3 Full HHSB0500300 In Stock $6.11132/EA EA
1/2 13 3 1/2 Full HHSB0500350 In Stock $6.19669/EA EA
1/2 13 4 Full HHSB0500400 In Stock $5.90585/EA EA
5/8 11 1 Full HHSB0620100 In Stock $5.23372/EA EA
5/8 11 1 1/2 Full HHSB0620150 In Stock $4.91775/EA EA
5/8 11 1 3/4 Full HHSB0620175 In Stock $8.11343/EA EA
5/8 11 2 Full HHSB0620200 In Stock $7.46385/EA EA