Foam Screws | McMaster-Carr

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About Tapping Screws

About Nuts, Materials, and Finishes

About Thumb Screw and Binding Post Materials

Drill a pilot hole, cut threads, and fasten in one motion with these metric-threaded screws. They're self-drilling, meaning they have a pointed tip that forms a pilot hole as they enter your material. As they turn, they also cut their own reusable threads, so you don’t need to drill and tap a hole first. Designed for fastening metal to metal, these screws are often used to install ducts and other assemblies where you can only access one side. The rounded head gives your project a finished look. Made of steel, they’re strong and wear resistant. They’re also plated with zinc to protect the steel from rust and extend the life of the screws. They meet ISO and DIN dimensional standards.

The miminum thread length may vary for screws with an overall length of 50mm or longer.

		Drill Tip			Head
Lg., mm	Min. Thread Lg., mm	Type	Lg., mm	Max. Drilling Thick., mm	Dia., mm	Ht., mm	Drive Size	Approximate Thread Pitch, mm	For Use In	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M2.9
9.5	3.3	No. 1	6.25	1.9	5.6	2.4	No. 1	1.1	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
13	6.6	No. 1	6.4	1.9	5.6	2.4	No. 1	1.1	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
16	9.6	No. 1	6.4	1.9	5.6	2.4	No. 1	1.1	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
19	12.5	No. 1	6.5	1.9	5.6	2.4	No. 1	1.1	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
M3.5
9.5	2.9	No. 2	6.65	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
13	6.2	No. 2	6.8	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
16	9.2	No. 2	6.8	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
19	12.1	No. 2	6.9	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
22	15.1	No. 2	6.9	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
25	18.1	No. 2	6.9	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
32	25.1	No. 2	6.9	2.25	7	2.6	No. 2	1.3	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
M3.9
9.5	2.8	No. 2	6.7	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
13	5.8	No. 2	7.2	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
16	8.8	No. 2	7.2	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
19	11.7	No. 2	7.3	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
22	14.7	No. 2	7.3	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
25	17.7	No. 2	7.3	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
32	24.5	No. 2	7.5	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
38	30.5	No. 2	7.5	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
45	37.5	No. 2	7.5	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
50	42.5	No. 2	7.5	2.4	7.5	2.8	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
M4.2
13	4.3	No. 2	8.7	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
16	7.3	No. 2	8.7	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
19	10.3	No. 2	8.7	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
22	13.3	No. 2	8.7	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
25	16.3	No. 2	8.7	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
32	23	No. 2	9	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
38	29	No. 2	9	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
45	36	No. 2	9	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
50	41	No. 2	9	3	8.2	3.1	No. 2	1.4	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
M4.8
13	3.7	No. 2	9.3	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	0000
16	5.8	No. 2	10.2	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
19	8.7	No. 2	10.3	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
22	11.7	No. 2	10.3	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
25	14.7	No. 2	10.3	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	100	000000000	00000
32	21.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
38	27.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
45	34.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
50	39.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
60	49.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
70	59.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
80	69.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
90	79.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
100	89.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
110	99.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000
120	109.5	No. 2	10.5	4.4	9.5	3.7	No. 2	1.6	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000
M5.5
16	5	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
19	8	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
22	11	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	0000
25	14	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
32	21	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
38	27	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
45	34	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
50	39	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
60	49	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
70	59	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
80	69	No. 3	11	5.25	11	4	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
M6.3
16	4	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
19	7	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
22	10	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
25	13	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	50	000000000	00000
32	20	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
38	26	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
45	33	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	0000
50	38	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
60	48	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	25	000000000	00000
70	58	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000
80	68	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000
90	78	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000
100	88	No. 3	12	6	12.5	4.6	No. 3	1.8	Steel, Stainless Steel, Aluminum, Fabric, Insulation, Sheet Metal, Wood	DIN 7504 N, ISO 7049	10	000000000	0000

Drilling Screws for Joining Insulation to Metal

Steel Washer

Polypropylene Plastic

Also known as roofing screws, these screws are long and made from hardened steel to fasten rigid insulation board to steel decking. They save you time and effort by drilling their own holes and fastening in a single operation. Made from steel, they're coated to resist corrosion in wet environments. Length is measured from under the head.

		Head
Lg.	Max. Drilling Thick.	Dia.	Ht.	Drive Size	Approximate Threads per Inch	Threading	Thread Length	For Use In	Specifications Met	Pkg. Qty.		Pkg.
Black Epoxy-Coated Steel
No. 15
2"	0.047"	0.435"	0.118"	No. 3	13	Fully Threaded	__	Steel, Insulation, Sheet Metal	FM Approved	50	000000000	000000
3"	0.047"	0.435"	0.118"	No. 3	13	Fully Threaded	__	Steel, Insulation, Sheet Metal	FM Approved	25	000000000	00000
4"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	3"	Steel, Insulation, Sheet Metal	FM Approved	25	000000000	00000
5"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	4"	Steel, Insulation, Sheet Metal	FM Approved	20	000000000	00000
6"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	4"	Steel, Insulation, Sheet Metal	FM Approved	10	000000000	0000
7"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	4"	Steel, Insulation, Sheet Metal	FM Approved	10	000000000	00000
8"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	4"	Steel, Insulation, Sheet Metal	FM Approved	10	000000000	00000
10"	0.047"	0.435"	0.118"	No. 3	13	Partially Threaded	4"	Steel, Insulation, Sheet Metal	FM Approved	5	000000000	00000

Round Plastic Washers (Pkg. of 25)	000000000	Pkg.	000000
Hex Steel Washers (Pkg. of 50)	000000000	Pkg.	00000

Sealing Binding Barrels and Screws

Sealed with PVC foam under the head to prevent leaks and keep contaminants out. Barrels and screws have a low-profile head with a Torx drive. Screws have a knurled shoulder that resists rotation and adhesive on the threads to resist loosening. They're also known as Camtainer fasteners. A zinc plating provides corrosion resistance in wet environments. Barrel length is measured from under the head; screw length is measured from under the shoulder.

	Barrel					Screw				Thread Locker
For Material Thick.	Lg.	Dia.	Head Dia.	Head Ht	Drive Size	Lg.	Head Dia.	Head Ht.	Seal Temperature Range, °F	Type	Temperature Range, °F	Pkg. Qty.		Pkg.
Zinc-Plated Steel
5/16"-18
0.695" to 0.744"	3/8"	25/64"	1"	5/32"	T55	39/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	000000
0.72" to 0.814"	3/8"	25/64"	1"	5/32"	T55	47/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.82" to 0.869"	1/2"	25/64"	1"	5/32"	T55	39/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.82" to 0.939"	1/2"	25/64"	1"	5/32"	T55	47/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.845" to 0.939"	1/2"	25/64"	1"	5/32"	T55	55/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.935" to 0.984"	5/8"	25/64"	1"	5/32"	T55	39/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.935" to 1.054"	5/8"	25/64"	1"	5/32"	T55	47/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.935" to 1.179"	5/8"	25/64"	1"	5/32"	T55	55/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.97" to 1.064"	3/8"	25/64"	1"	5/32"	T55	63/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.97" to 1.189"	1/2"	25/64"	1"	5/32"	T55	63/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
0.97" to 1.304"	5/8"	25/64"	1"	5/32"	T55	63/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.22" to 1.439"	1/2"	25/64"	1"	5/32"	T55	1 15/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.22" to 1.554"	5/8"	25/64"	1"	5/32"	T55	1 15/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.32" to 1.369"	1"	25/64"	1"	5/32"	T55	39/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.32" to 1.564"	1"	25/64"	1"	5/32"	T55	55/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.32" to 1.689"	1"	25/64"	1"	5/32"	T55	63/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.32" to 1.939"	1"	25/64"	1"	5/32"	T55	1 15/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.401" to 1.495"	3/8"	25/64"	1"	5/32"	T55	1 27/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.401" to 1.62"	1/2"	25/64"	1"	5/32"	T55	1 27/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000
1.401" to 2.12"	1"	25/64"	1"	5/32"	T55	1 27/64"	7/8"	3/16"	-40° to 300°	Epoxy Patch	-65° to 300°	5	000000000	00000

Flange-Sealing Rivet Nuts

The PVC foam seal under the flange keeps liquids and gasses from leaking between the nut and the surrounding material. These rivet nuts have a ribbed body to hold them in place when tightening a screw. The body is aluminum and mildly corrosion resistant. Install in a drilled hole using a rivet nut tool. The tool collapses the nut, creating a backside flange that holds the nut to the material. Length is measured from under the flange. Installed length is the maximum length of the barrel when installed.