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.

3M 62605, Scotch-Weld Threadlocker TL42, Blue, 10 mL Bottle, 7100039190, 10/case
ACS CX1250 Diamond Belt, 1/2" X 24" 175u
3M 20227, Scotch-Seal Metal Sealant 2084, Silver, 5 oz Tube, 7000046343, 36/Case
3M 77559, Cubitron II Hookit Cloth Disc 784F, 77559, 36+ to 120+, 5 in x NH, Die 500X, 7100232738
3M 21543, Scotch-Brite Roloc Clean and Strip XT Pro Extra Cut Disc, TR, 2 in x NH, A XCS, 7100179815, 60/box
3M 16580, Accuspray ONE Spray Gun System with Standard PPS, 7100099202
3M Scotchkote Liquid Epoxy Coating Spray System HSS Mix Nozzle, RightAngle, 7000058900
3M 09292, Rubber Sanding Block, 7000126886
3M 22394, Roloc Disc 361F, 50 YF-weight, TR, 3 in, Die R300V, 7000045096
3M 20913, PSA Cloth Disc 348D, 36 X-weight, 2 in x NH, Die 200P, 7000118919
3M 33780, 641WY 1/4" X 24", 400 Mesh Diamond Cloth Belt, 7010534915
3M 11414, Roloc Disc 361F, P120 XF-weight, TR, 1 in, Die R100N, 7000045104
3M™ 07012, Supplied Air Hose W-9435-100/07012(AAD), 100 ft, 3/8 in ID, Industrial Interchange Fittings, High Pressure, 7000005375, 1 EA/Case
3M 05441, Stikit Hand Block, 2-3/4 in x 7-3/4 in, 7000045765
3M 53034, 663FC, 3/4" X 90", 20u, Diamond Trizact Belt 7100205969
Air Turbine Tools 310RSV - 1/4" Router Hand Tool Series with Brake, 40,000RPM, 33444
Dynabrade 15420 Dynafile III Abrasive Belt Tool
3M™ 72787, Calibration Kit 529-04-48, Large, 7000052154, 1 EA/Case
3M 29611, 641WY 1/4" X 24", 100 Mesh Diamond Cloth Belt, 7010534832
Dynabrade 55501 .1hp Pencil Grinder, Twin Turbine, 100,000 RPM, Nickel-Plated Aluminum Housing, 3mm Collet
Dynabrade 51333 .7 hp Router, 4" Base, Central Vacuum, 20,000 RPM, 1/4 Collet
Standard Abrasives 37446, PSA A/O Disc, 700595, 1-1/2 in x NH, 60, 7010331822
3M 07958, Sanding Screen, 80 Grit, 7-7/8 in x 3/16 in, 7100160277
Dynabrade 90873 2" Dia. Medium NWN DynaBrite Locking-Type Disc, 25/pack
ACS Diamond Cloth Belt, CX1250 1/2" X 18" 125U
Insize HDT-PB350, HAMMER IMPACT BRINELL HARDNESS TESTER, 6940561966657
3M 47191, Polyurethane Adhesive Sealant 550FC Fast Cure, White, 400 mL Sausage Pack, 7100197999, 12/Case
3M 95307, Lead Foil Tape 421, Dark Silver, 3/4 in x 36 yd, 6.3 mil, 7000049079
3M 71358, 641WY 1/4" X 24", 600 Mesh Diamond Cloth Belt, 7010534894 