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.

Standard Abrasives 875705, MD Mini-Brush, 4-1/2 in x 4 in x 5/8-11 FBO54 16-16 S MED Medium Density, 7010369377
Dynabrade 95821 Dynabrade Air Lube 10W/NR, 4oz Bottle
3M 31959, 6450J, M125, 1" X 30", Type C, Pattern 18 Diamond Belts, 7100052712
Dynabrade 95842 Dynabrade Air Lube 10W/NR, 1 Pint
3M 04553, Adhesive Transfer Tape 950, Clear, 3/4 in x 60 yd, 5 mil, 7000048416
Dynabrade 64404 36" W x 60" L (914 mm W x 1,524 mm L) Metal Capture Downdraft Table, 230 V (AC), Side Exhaust
3M 11412, Roloc Disc 361F, 36 YF-weight, TR, 1 in, Die R100N, 7000045092
Dynabrade 15420 Dynafile III Abrasive Belt Tool
Dynabrade 10690 Filter/Regulator/Lubricator, FRL40, 1/2" NPTAssy.
3M 22394, Roloc Disc 361F, 50 YF-weight, TR, 3 in, Die R300V, 7000045096
3M 50010, VentureClad Insulation Jacketing Tape 1577CW-WME, White, 99 mm x 13.7 m, 7010379907
ACS CX1250 Diamond Belts, 1/2" X 24" 200u
3M 21543, Scotch-Brite Roloc Clean and Strip XT Pro Extra Cut Disc, TR, 2 in x NH, A XCS, 7100179815, 60/box
3M 08374, MSP Sprayable Seam Sealer, Gray, 10.5 FL OZ Cartridge, 7000148239, 6 per case
3M 27008, 642WY, 3" X 30", 50000 Mesh, Diamond Cloth Belts, 7010533172
Dynabrade 78745 1" x 2-3/4"-A3 DynaFire A/O Mounted Point, Vitrified, 5/pack
3M 85492, Scotch Foil Tape 3311-10A, 2.0 in x 10 yd (50.8 mm x 9,1 m), 7010383663
3M Scotchkote Liquid Epoxy Coating Spray System HSS Mix Nozzle, RightAngle, 7000058900
Standard Abrasives 710870, Cartridge Roll Mandrel, 1/8 in x 1/2 in x 1/4 in x 1-1/4 in x 2-1/4 in CM-7, 7000121794
Dynabrade 59339 Vacuum Cuff, 1", w/Groove
Standard Abrasives 531202, Quick Change Aluminum Oxide Resin Fiber Disc, 24, TN, Brown, 7 in, Die TN700BB, 7010369490, 25/case
3M™ 72013, Adapter 529-04-50, 110-120 VAC, 7000131705, 1 EA/Case
3M 49936, Roloc Disc 361F, 36 YF-weight, TSM, 2 in, Die RS200PM, 7000119014
3M 43474, Glass Cloth Tape 3615, White, 1 in x 36 yd, 7 mil, 7000048876
3M 84158, Microfinishing PSA Film Disc 366L, 30 Mic 3MIL, Type D, 5 in x NH, Die 500X, 7010360217, 500 per case
Standard Abrasives 843937, Quick Change Surface Conditioning GP Disc, 2560593, A/O Coarse, TSM, Brown, 7 in x 5/8"-11, 7000121657, 10/case
3M 20913, PSA Cloth Disc 348D, 36 X-weight, 2 in x NH, Die 200P, 7000118919
3M 22409, Roloc Disc 361F, P120 XF-weight, TR, 1-1/2 in, Die R150S, 7000045103
3M 45120, Cartridge RoII Mandrel, 3/32 in x 3/4 in x 1/4 in, 7010328349
3M 05048, Cloth Belt 384F, 80+ XF-weight, 1 in x 12 in, Fabri-lok, Full-flex, 7100141432, 200 per case
3M 41597, Polyurethane Adhesive Sealant 560, Black, 310 mL Cartridge, 7100005901, 12/Case
3M 26481, 641WY, 3" X 30", 100 Mesh, Diamond Cloth Belts, 7010508917
3M 29860, Sanding Screen, 120 grit, 12 in x 18 in, 7100160860
Standard Abrasives 708751, PSA A/O Disc, 12 in x NH, 60, 7010370081
3M 05182, Scotch-Brite Cut and Polish Wheel, CP-WL, 5A Fine, 6 in x 1/2 in x 1 in, 7100050403,Box of 4
ACS Diamond Cloth Belt, CX1250 3/8" X 24" 75U
3M 20932, PSA Cloth Disc 348D, 80 X-weight, 1 in x NH, Die 100N, 7000118914
3M 08367, Urethane Seam Sealer, Black, 310 mL Cartridge, 7000119968, 12 per case
3M™ 72010, Replacement Filter Kit 523-01-29, 7000056891, 1 EA/Case
3M 93947, Scotch Stucco Tape 3260-A, 1.88 in x 60 yd (48 mm x 54.8 m), Stucco Tape, 7010384961
3M 25138, Scotch-Weld Threadlocker TL43, Blue, 10 mL Bottle, 7100039219, 10/case
3M™ 72016, Remote Alarm & Strobe 529-05-20, Audible, 7000131708, 1 EA/Case 