Unlock Simplicity
Durable and secure, 3M™ Dual Lock™ Reclosable Fastener SJ3870 has exceptional strength through its interlocking mushroom-shaped heads (250 stem density per square inch), providing up to 5X the tensile strength of typical hook-and-loop products. 3M designed this fastener with a black, modified acrylic, very conformable foam tape protected by a removable, film liner. This solid, pressure sensitive foam tape features a strong, durable bond that is chemical and UV resistant. With 3M™ Dual Lock™ Reclosable Fastener SJ3870, there is no need for any drilling, screwing or sewing tools which makes for quick installation.
Recommended Applications:
- Access panels
- Graphic attachment
- General industrial attachment
- Small components
Design Flexibility
3M™ Dual Lock™ Reclosable Fastener SJ3870 consists of interlocking mushroom-shaped heads that easily slide over each other, allowing for positioning of parts before being snapped together. This fastening process creates a durable attachment and provides fast product assembly with great design flexibility. Reclosable fasteners can also engage with different stem densities for varying levels of strength and system performance.
3M™ Dual Lock™ Reclosable Fasteners sound an audible snap when secure, which verifies closure of the attachment. To disengage, simply peel the pieces apart by hand. These fasteners maintain their strength throughout multiple attachments and detachments. A lightweight alternative to metal fasteners, this product remains hidden beneath surfaces and does not interfere with the integrity of your material—providing aesthetic improvements and design flexibility.
Hundreds of Reattachments in a Snap
When two pieces of 3M™ Dual Lock™ Reclosable Fasteners mate, the stems flex and the mushroom heads slide past each other. After passing the opposing mating piece, the stems snap back into their original position and the opposing mushroom heads interlock. These fasteners can provide high tensile strength but can be opened by simply cleaving or peeling open the closure. This product is well suited for many indoor and outdoor applications where a high strength and versatile reclosable fastening system is required.
Delivers Long-Lasting Performance
Not all design requirements are easily satisfied, but you can simplify your attachments. When you need a strong, reliable, yet removable closure, 3M™ Dual Lock™ Reclosable Fasteners are the easy alternative to traditional fastening methods such as screws, nuts or bolts.

Dynabrade 79394 3" Dia. x 1/2" Thick x 3/8" Center Hole, Type 01 Straight Wheel, 10/box
3M 99433, Drywall Sanding Sheets 99433NA, 4-3/16 in x 11-1/4 in, 80 grit, 7100097101, 25 sheets per pack
3M 39606, Performance Sandpaper, 3-2/3 in x 9 in, 400/600 Grit, 7100216942, 6 Sheets Per Pack
3M 03020, Wetordry Sandpaper, 3-2/3 in x 9 in, 600 grit, 7100100328
3M 36195, Hookit Blue Abrasive Sheet Roll, 320 grade, 2.75 in x 13 yd, Multi-hole, 7100219220
3M 50727, Scotch Rubber Mastic Tape 2228, 1 in x 10 ft, Black, 7000006048
3M 85299, Blue Sandpaper 31580-8, 3-2/3 in X 9 in, 600 G, 7100227046, 8 Sheet Per Pack
3M 30287, Low-Static Polyimide Film Tape 5419 Gold, 22-1/2 in x 36 yds x 2.7 mil, 7000050146
3M 22397, Roloc Disc 361F, 60 YF-weight, TR, 1-1/2 in x NH, 7000045097
3M 77197, Scotch-Brite™ Roloc™ Deburr and Finish PRO Unitized Wheel,TR, 3 in x 1/8 in x NH, 8C CRS+, 7100109130, 40/box
3M 57262, Scotch Heavy Duty Rubber Electrical Tape 70 HDT, 1 in x 30 ft, Sky Blue/Gray, 7000133168
3M 09087, Wetordry Sanding Sheets 9087NA, 9 in x 11 in, 220 grit, 7010383682, 5 sheets per pack
3M 15017, Scotch Electrical Semi-Conducting Tape 13, 3/4 in x 15 ft, Printed, Black, 7000007284
3M 41753, Scotch Linerless Rubber Splicing Tape 130C, 1 in x 30 ft, Black, 7000006090
3M 03001, Wetordry Sandpaper, 1000 Grit, 3-2/3 inch x 9 inch, 7100100323
3M 27368, Ultra Durable Power Sanding 1/4 in Sheet, 120 grit, 7100198729, 5 per pack
3M 43251, Linerless Electrical Rubber Tape 2242, 2 in x 15 ft, 1 in core, Black, 7000132759
3M 09003, Aluminum Oxide Sandpaper Coarse, 9003NA, 9 in x 11 in, 7100140808, 4 Per Pack
3M 27380, Ultra Durable Detail Sanding Sheets, 80 grit, 7100200066, 5 per pack
3M 95884, Scotch Electrical Semi-Conducting Tape 13, 1 in x 15 ft, Printed, Black, 7100017214
3M 08742, Inhalation Valve 7282, 7000125986, 200 EA/Case
3M 30228, Low-Static Polyimide Film Tape 5419 Gold, 1 in x 36 yds x 2.7 mil, Plastic Core, 7000125231
3M 53914, Performance Plus Duct Tape 8979N Nuclear Red, 48 mm x 54.8 m 12.1 mil, 7000049014, 24/ case
3M 20227, Scotch-Seal Metal Sealant 2084, Silver, 5 oz Tube, 7000046343, 36/Case
3M 11412, Roloc Disc 361F, 36 YF-weight, TR, 1 in, Die R100N, 7000045092
3M 76783, Cubitron II Hookit Cloth Disc 784F, 120+ XF-weight, 5 in x NH, Die 500X, 7100222757
3M™ 53797, Flexible Diamond Belt 6451J, 1/2" Dia x 18" L, M125 Micron, Type G, Pattern B2, 7010509272 