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INSUL PIERCING WASHER CU 1/2 STUD
Manufacturer Resources
Product Specs
- Idea Granular Category Code Igcc:
- 2885 >> Flat washers
- Inside Diameter:
- 0.56 in14.2 mm
- Outside Diameter:
- 1.25 in31.8 mm
- Product Group:
- Hardware
- Product Type:
- Transition Washer
- Selling Unit Of Measure:
- each
- Standards:
- UL E9809
- Sub Brand Label:
- Dragon Tooth
- Suitable For:
- 1/2 Inch
- Surface Finishing:
- Tin Plated
- Thickness:
- 0.035 in0.89 mm
- Department:
- Electrical
- Product Subgroup:
- Washers
- Product Material:
- Copper
Thomas & Betts FPW12 – Frequently Asked Questions
1) What does the Thomas & Betts FPW12 insulation piercing washer actually do?
The FPW12 is a copper, tin plated transition washer from the Thomas & Betts Dragon Tooth line. Its teeth bite through paint, anodizing, or oxide films on a metal surface so a bolted connection makes metal to metal contact for grounding and bonding, without you having to grind the finish off first. It is sized for a 1/2 inch stud or bolt.
2) Will the FPW12 washer fit a 1/2 inch bolt or ground stud?
Yes. The FPW12 is made for 1/2 inch hardware, with a 0.56 inch (14.2 mm) inside diameter so it clears a 1/2 inch stud, and a 1.25 inch (31.8 mm) outside diameter for the bearing surface. It runs 0.035 inch (0.89 mm) thick, so it adds almost nothing to your stack-up under the nut.
3) Do I still need to scrape the paint off a painted enclosure or strut if I use this washer?
That is the point of the Dragon Tooth design. The teeth on the FPW12 cut through the coating as the nut is torqued down, establishing the metal to metal path on a painted or coated surface so you are not grinding finish off the panel. It handles a 1/2 inch stud.
4) Why copper with tin plating instead of a plain steel washer?
The FPW12 is copper for conductivity, and tin plated so it can sit against aluminum or galvanized surfaces without the galvanic problem you get putting bare copper directly on dissimilar metal. A plain steel flat washer is a fastener part, not a bonding part, and it will not pierce a coating.
5) What is the manufacturer part number for the 1/2 inch Dragon Tooth piercing washer?
Thomas & Betts part number FPW12. The FP prefix runs by stud size, so specify FPW12 when you need the 1/2 inch version.
6) Is the FPW12 sold individually or only in a box?
The FPW12 is sold each, so you can order the exact count your ground bar or stud terminations call for rather than a full carton.
How fast can I get the Thomas & Betts FPW12 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Thomas & Betts FPW12 come with a warranty?
Absolutely. The Thomas & Betts FPW12 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Thomas & Betts FPW12?
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installation tips, and troubleshooting. Contact Us
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