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10 PC XZN TRIPLE SQUARE LONG SPLINE BIT SOCKET TAMPERED $27.99 Time Remaining: 18d 20h 23m Buy It Now for only: $27.99

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18 Pcs 3 8 Dr Penta Metric Spline Shape Socket Set Works On Damaged Fasteners $41.49 Time Remaining: 4d 15h 38m

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SNAP ON 4 PCS SPLINE SOCKET SET 12pt 1 4 DRIVE NEW $40.00 Time Remaining: 5d 16h 8m

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SK 10 Piece 3 8 Fractional Universal Spline Socket Set 4670 $39.95 Time Remaining: 4d 16h 30m Buy It Now for only: $39.95

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USED SNAP ON TOOLS 3 8 DRIVE SPLINE SOCKET FEL180 9 16 $5.83 Time Remaining: 2d 3m

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SNAP ON 3 4 Hex Spline Shallow Socket 24 1 2 Drive SES241 Fast Free USA Ship $24.99 Time Remaining: 27d 13h 47m Buy It Now for only: $24.99

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Neiko 8pc 1 2 Dr Impact Tamper Spline Socket Set $36.95 Time Remaining: 22d 18h 40m Buy It Now for only: $36.95

Sunex 9723 Universal Spline Socket Set $42.55 Time Remaining: 28d 9h 35m Buy It Now for only: $42.55

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BAHCO SNAP ON TOOLS 1 13 16 SPLINE DR SOCKET $15.00 Time Remaining: 1d 17h 34m

VW AUDI Ball Joint M14 Multi Spline Socket 14mm 1 2 drive $15.99 Time Remaining: 14d 23h 59m Buy It Now for only: $15.99

58 pcs Star HEX Spline Ribe Power Bit Metric Socket Set $53.00 Time Remaining: 13d 12h 23m Buy It Now for only: $53.00

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SNAP ON 3 8 HIGH PERFORMANCE SPLINE SOCKET 3 8 DRIVE NEW $13.00 Time Remaining: 4d 20h 36m

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13 Piece 1 4 Drive Universal Spline Socket Set SUN9723 $42.62 Time Remaining: 27d 11h 25m Buy It Now for only: $42.62

VWAUDI M14H TRANSPORTERS MULTI SPLINE SOCKET $9.50 Time Remaining: 4d 19h 54m

5 Spline Drive Square Impact Socket 1 1 2 x 13 16 SUN5530 BRAND NEW $73.56 Time Remaining: 27d 11h 24m Buy It Now for only: $73.56

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19 Pcs 1 2 DR Penta Metric Spline Socket Set Pro New Chrome Vanadium Steel HD $49.49 Time Remaining: 4d 15h 40m

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Ozat 1 5 8 41mm 5 Spline 6 pt Impact Socket $89.00 Time Remaining: 11d 7h 33m Buy It Now for only: $89.00

VW Audi Porsche Socket Bit Spline Set Model 6300 NEW $62.99 Time Remaining: 6d 16h 40m Buy It Now for only: $62.99

Sunex Universal Spline Socket Set w Flex Head Ratchet $28.99 Time Remaining: 15d 5h 14m Buy It Now for only: $28.99

VW AUDI 1 2 x M14H TRANSPORTERS MULTI SPLINE SOCKET $9.50 Time Remaining: 4d 19h 48m

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Chicago Pneumatic 15 16 HEX Socket 5 Spline Drive $47.00 Time Remaining: 6d 11h 46m Buy It Now for only: $47.00

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Snap On Tools 5 Spline Drive 2 1 4 Socket Item Model IMS 727 Six Point $115.00 Time Remaining: 1d 23h 14m Buy It Now for only: $115.00

Spline Socket

Impact driver - Precision Machining Parts - Lost Wax Castings

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (August 2009)

An impact driver is a tool that delivers a strong, sudden rotational and downward force. In conjunction with toughened screwdriver bits and socket sets, they are often used by mechanics to loosen larger screws (bolts) and nuts that are corrosively "frozen" or over-torqued. The direction can also be reversed for situations where screws have to be tightened with torque greater than what a screwdriver can reasonably provide.

A manual impact driver with screwdriver bits and adapters

Manual impact drivers consist of a heavy outer sleeve that surrounds an inner core that is splined to it. The spline is curved so that when the user strikes the outer sleeve with a hammer, its downward force works on the spline to produce turning force on the core and any socket or work bit attached to it. The tool translates the heavy rotational inertia of the sleeve to the lighter core to generate large amounts of torque. At the same time, the striking blow from the hammer forces the impact driver down into the screw reducing or eliminating cam out. This attribute is most beneficial for Philips screws which normally cam out as part of their design. It is less beneficial for flat head, also known as common, screws and is not beneficial at all for most other types.

Cordless motorized impact driver, battery, charger, and some bits

Another type of impact driver uses a motor to automatically deliver the downward and rotational forces. These have the advantage of greatly increased speed. They are most often used in construction and manufacturing to replace screwdrivers where speed and operator fatigue are an issue. In some situations however, this type falls short since current designs cannot deliver the heavy downward blow of a manual unit. This can be especially true on very stubborn fasteners.

These are not to be confused with the impact wrench, which is a motorized tool (usually powered by compressed air), with a similar name and function. These also use a hammering action to apply torque to fasteners. The difference is that impact wrenches do not provide the positive engagement that impact drivers offer as mentioned above. This is desirable though on hex head fasteners and others where the downward seating action is unnecessary and potentially damaging. To add to the confusion, they look identical to motorized impact drivers.

Buyers must also be aware that some tools improperly advertised as impact drivers are actually just impact wrenches. The only way to verify that a motorized impact driver is truly what it claims to be (without taking it apart) is to try it before purchasing.

Categories: Mechanical hand toolsHidden categories: Articles lacking sources from August 2009 | All articles lacking sources

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The e-commerce company in China offers quality products such as Precision Machining Parts , Lost Wax Castings, and more. For more , please visit Precision Machining Parts today!

why do we have so many different screw drivers and screws?

we have a philips, slotted, pozidriv, square, robertson, hex, hex socket, torx, tri wing, torq set, spanner head, triple square, poly drive, one way clutch, spline drive, double hex, and bristol

If it is a thin piece of woon and fragile, you don't want to use a 3" screw that is 1/2" diameter.

Many different jobs, many ways to do those jobs.

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Facom Long Socket Module - Torx/Hex/Spline