Temporary personal protective equipment is designed for one purpose only, to protect the worker.
Grounding equipment should be manufactured to and maintained to the highest standards.
Very stringent requirements are specified by the ASTM F855 standard. While this is a voluntary
standard, we design all our clamps, cables and ferrules to exceed the values of this standard.
The withstand values from ASTM are:
Grade 15 Cycle
1 14 10 #2 200
2 21 15 1/0 250
3 27 20 2/0 300
4 34 25 3/0 350
5 43 30 4/0 400
Whether it’s the machining of the casting, the assembly of the clamp, or the assembly of the complete
grounding or jumper assembly, we pride ourselves in the quality of the product that is created at Hast-
ings. Every employee that handles the parts is vigilant for any quality issues.
Clamps are available in either bronze alloy or aluminum alloy metals. Great care is taken in selecting the
best materials for the performance required. The bronze alloys allow for higher strength and higher melt-
ing temperatures. Aluminum alloys allow for lighter weight and less resistance.
Hastings works closely with the utility industry in solving grounding problems. Through our close con-
tact with our customers, we stay in touch with their needs and this guides our efforts for future product
designs. Hastings also participates in the development of industry standards.
MULTI-PURPOSE GROUND CLAMP AND BALL STUDS
? C Head upper jaw is designed for use on conductors. Slotted “V” also allows the ground clamp to be attached to the ball stud(s) shown.
? Both sides of the clamp are drilled and tapped to attach ball studs for use as hanger studs. Drilled and tapped holes are 1/2”-13 and can also be utilized as
CAT NO DESCRIPTION MAIN LINE RANGE
556 MCM .86 DIA
6 SOLID .16 DIA
43KA@ 15 CYCLES
30KA@ 30 CYCLES
21705 20mm BALL STUD / 1/2-13 X 1/2” LONG THREAD – TIN PLATED COPPER 0.4
21706 20mm BALL STUD/ 1/2-13 X 2” LONG THREAD – TIN PLATED COPPER 0.5
BALL SOCKET GROUND CLAMPS AND BALL STUDS
CAT NO DESCRIPTION RANGE MAXIMUM
21720 EYE SCREW 1” O.D. BALL STUD 4/0 43KA@ 15 CYCLES
30KA@ 30 CYCLES
21726 T HANDLE 1.4
21721 BALL STUD, 1” O.D., SHORT – 1/2-13 THREAD, 2 1/4” LONG SHANK – TIN PLATED COPPER 0.5
21722 BALL STUD, 1” O.D., LONG – 1/2-13 THREAD, 4” LONG SHANK – TIN PLATED COPPER 0.8
21725 BALL STUD COVER 0.2