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    35 Products

    Extension Springs

    The farther you stretch these springs, the harder they pull to bring the two ends back together. They're commonly used to tension cable, return an air cylinder to its starting point, or hold a door closed.
    Loop End—The most secure attachment method. With fully closed loops, there's no risk of slipping off.
    Hook End—Hook into closed holes, such as hanger bolt eyes. These springs work best when kept under tension, as they're more likely to slip off than loop-end springs when tension is released. Also known as machine hook ends.
    Elongated Hook—With deeper hooks than standard hook end springs, these are less likely to slip off. However, they’re more prone to breaking if overstretched.
    Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.
    Corrosion-Resistant 302 Stainless Steel—Won’t corrode from exposure to moisture and mild chemicals, including ammonia often found in cleaning solutions. These springs are easier to extend than steel, but can’t handle as high a load.
    Highly Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant stainless steel springs won't degrade when exposed to salt water and harsh chemicals. They're easier to extend than steel, but can’t handle as high a load.
    Minimum Load—The amount of force required to start extending the spring.
    Maximum Load—The amount of force required to fully extend the spring.
    Load,
    lb.
    Lg.
    OD
    Wire
    Dia.
    Extended Lg.
    @ Max. Load
    Min.
    Max.
    Spring Rate,
    lbf/in
    Pkg.
    Qty.
    Pkg.
    Loop End
    Image of Product. Front orientation. Extension Springs. Loop End.
     
    Spring Steel
    1.625"0.18"0.018"5.03"0.11.70.4510000000000000
     
    Highly Corrosion-Resistant 316 Stainless Steel
    1.625"0.188"0.018"2.714"0.120.520.451000000000000
    1.625"0.188"0.02"2.41"0.180.70.79100000000000
     
    Hook End
    Image of Product. Front orientation. Extension Springs. Hook End.
     
    Spring Steel
    1.625"0.5"0.08"1.875"8.0426.172.2560000000000000
    1.625"0.719"0.106"1.755"13.8231.02125.696000000000000
     
    Corrosion-Resistant 302 Stainless Steel
    1.625"0.25"0.025"3.73"0.32.10.871000000000000
    1.625"0.25"0.032"2.83"0.84.73.161000000000000
    1.625"0.25"0.038"2.3"27.78.421000000000000
     
    Elongated-Hook End × Loop End
    Image of Product. Front orientation. Extension Springs. Elongated-Hook End × Loop End.
     
    Spring Steel
    1 5/8"0.25"0.039"1.895"1.957.2919.4260000000000000
     

    Compression Springs

    Image of Product. Front orientation. Compression Springs.
    Squeeze these springs and they’ll push right back to their original length. When compressed, they apply steady pressure to keep components securely in place. Release the pressure and they snap back instantly, just like the tip of a ballpoint pen.
    Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.
    Corrosion-Resistant 302 Stainless Steel—Won’t corrode from exposure to moisture and mild chemicals, including ammonia often found in cleaning solutions. These springs are easier to compress than steel, but can’t handle as high a load.
    Lg.
    OD
    ID
    Wire
    Dia.
    Compressed Lg.
    @ Max. Load
    Max. Load,
    lb.
    Spring Rate,
    lbf/in
    End Type
    Pkg.
    Qty.
    Pkg.
    Spring Steel
    1.625"0.312"0.231"0.041"1.165"7.216Closed120000000000000
    1.625"0.781"0.541"0.12"1.275"59170Closed and Ground6000000000000
     
    Corrosion-Resistant 302 Stainless Steel
    1.625"0.781"0.541"0.12"1.275"52150Closed60000000000000
     

    Ultra-Shock-Absorbing Rubber Compression Springs

    Image of Product. Front orientation. Compression Springs. Ultra-Shock-Absorbing Rubber Compression Springs.
    Best for taking the hardest hits with minimal compression, these stout springs absorb more shock than any other spring we offer. The largest absorbs 17,000 in·lbf of energy, which is the force of a 20-lb. sledgehammer strike. Made from a polyester/rubber blend, they stay springy longer than metal and plastic springs—with documented cases up to one million cycles. They also stand up to oils, fuels, and mild cleaning solutions.
    Secure by inserting a fastener through the hole at the base.
    Hardness—As the durometer gets higher, the springs absorb more energy but compress less.
    Lg.
    OD
    ID
    Compressed Lg.
    @ Max. Load
    Compressed OD @
    Max. Load
    Max. Load,
    lb.
    Energy Cap.,
    in·lbf
    Hardness
    Temp. Range,
    ° F
    Each
    1.625"1.8"0.93"0.88"2.33"3,0001,100Durometer 55D-40 to 1200000000000000

    Extension Spring Stud Anchors

    Image of Product. Front orientation. Contains Annotated. Hanger Bolts. Extension Spring Stud Anchors.
    A black-oxide finish provides these steel anchors with mild corrosion resistance. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection.
    Thread
    Size
    Min.
    Lg.
    Spacing
    Lg.
    Dia.
    Hole
    Dia.
    Each
    Black-Oxide Steel
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.22"000000000000
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.268"00000000000
    3/8"-24
    		1 1/8"Fine
    		1 5/8"3/8"0.22"00000000000
     

    Corrosion-Resistant Extension Spring Stud Anchors

    Image of Product. Front orientation. Contains Annotated. Hanger Bolts. Corrosion-Resistant Extension Spring Stud Anchors.
    These stainless steel stud anchors offer excellent corrosion resistance. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection.
    Thread
    Size
    Min.
    Lg.
    Spacing
    Lg.
    Dia.
    Hole
    Dia.
    Each
    18-8 Stainless Steel
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.22"000000000000000
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.268"00000000000000
    3/8"-24
    		1 1/8"Fine
    		1 5/8"3/8"0.22"00000000000000
     

    Swiveling Extension Spring Stud Anchors

    Image of Product. Front orientation. Contains Annotated. Hanger Bolts. Swiveling Extension Spring Stud Anchors.
    A black-oxide finish provides these steel anchors with mild corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.
    Thread
    Size
    Min.
    Lg.
    Spacing
    Lg.
    Dia.
    Hole
    Dia.
    Hex
    Size
    Each
    Black-Oxide Steel
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.22"1/8"000000000000000
    3/8"-24
    		1 1/8"Fine
    		1 5/8"3/8"0.22"1/8"00000000000000
     

    Corrosion-Resistant Swiveling Extension Spring Stud Anchors

    Image of Product. Front orientation. Contains Annotated. Hanger Bolts. Corrosion-Resistant Swiveling Extension Spring Stud Anchors.
    These stainless steel stud anchors offer excellent corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.
    Thread
    Size
    Min.
    Lg.
    Spacing
    Lg.
    Dia.
    Hole
    Dia.
    Hex
    Size
    Each
    18-8 Stainless Steel
    3/8"-16
    		1 1/8"Coarse
    		1 5/8"3/8"0.22"1/8"000000000000000
    3/8"-24
    		1 1/8"Fine
    		1 5/8"3/8"0.22"1/8"00000000000000
     

    Slotted Spring Pins

    Image of Product. Front orientation. Spring Pins. Slotted Spring Pins.
    Image of Product. End View. Side1 orientation. Spring Pins. Slotted Spring Pins.

    End View

    Squeeze these pins into holes and they expand slightly, creating tension to hold parts in place. They are often used as hinge pins and as fasteners for springs and power transmission components. An alternative to dowel pins, they're lighter in weight with a hollow center and don’t need a precise hole. Also known as roll pins.
    Spring Steel—These pins won't deform from stress and vibration. Although they're stronger than stainless steel, they're best for dry environments since moisture will cause them to rust.
    Zinc-Plated Spring Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Corrosion-Resistant 18-8 Stainless Steel—The choice for wet and outdoor environments, these pins resist rusting. They are strong enough to join most components but won't withstand extreme stress and vibration as well as steel.
    Wear-Resistant 400 Series Stainless Steel—Our most wear-resistant stainless steel pins, these are good for pivoting parts that create a lot of friction. They hold up in environments that experience occasional moisture, but they're not as corrosion resistant as 18-8 and 316 stainless steel.
    Lg.
    For Hole Dia.
    Wall
    Thk.
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Spring Steel
     
    1/8" Diameter
    1 5/8"0.125" to 0.129"0.028"1,800Rockwell C43ASME B18.8.210000000000000000
     
    3/16" Diameter
    1 5/8"0.187" to 0.192"0.04"4,100Rockwell C43ASME B18.8.210000000000000000
     
    1/4" Diameter
    1 5/8"0.25" to 0.256"0.048"7,000Rockwell C43ASME B18.8.25000000000000000
     
    Zinc-Plated Spring Steel
     
    1/8" Diameter
    1 5/8"0.125" to 0.129"0.028"1,800Rockwell C43ASME B18.8.210000000000000000
     
    3/16" Diameter
    1 5/8"0.187" to 0.192"0.04"4,100Rockwell C43ASME B18.8.210000000000000000
     
    1/4" Diameter
    1 5/8"0.25" to 0.256"0.048"7,000Rockwell C43ASME B18.8.25000000000000000
     
    Corrosion-Resistant 18-8 Stainless Steel
     
    1/8" Diameter
    1 5/8"0.125" to 0.129"0.028"1,000Not RatedASME B18.8.25000000000000000
     
    3/16" Diameter
    1 5/8"0.187" to 0.192"0.04"2,400Not RatedASME B18.8.22500000000000000
     
    1/4" Diameter
    1 5/8"0.25" to 0.256"0.048"4,100Not RatedASME B18.8.22500000000000000
     
    Wear-Resistant 400 Series Stainless Steel
     
    1/8" Diameter
    1 5/8"0.125" to 0.129"0.028"1,800Rockwell C43ASME B18.8.25000000000000000
     
    3/16" Diameter
    1 5/8"0.187" to 0.192"0.04"4,100Rockwell C43ASME B18.8.2250000000000000
     
    1/4" Diameter
    1 5/8"0.25" to 0.256"0.048"7,000Rockwell C43ASME B18.8.22500000000000000
     
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