Website service may be temporarily interrupted between 5:00-7:00 pm EDT on Tuesday, October 17.

E-mail this page Print this page

Supplying FRP Fabricators for over 50 years

Any questions? Call 800-330-9552 or Contact us by email.
Home » Product » Pads for discs with center holes

Pads for discs with center holes

Backing pads, back-up pads, Spiralcool pads, disc pads, disc backup pads, disc pad holders.

Scroll down for heavy duty pad for larger tool spindles. Purchaser assumes all responsibility for the safety of user and bystanders around the grinding operations. These backing pads are designed for abrasive discs with a 7/8" center hole. Pads thread onto one of three different tool spindles. Abrasive discs are shown on our Resin fiber discs and Resin fiber discs, heavy-duty pages.

SAFETY WARNING: Make sure the maximum RPM of the backing pad you choose, is more than the RPM of the power tool you are using. Also make sure the maximum RPM of the abrasive disc you are using, is more than the RPM of your power tool.

Used on 3/8"-24 threaded tool spindles

5" plastic backing pad with internal 3/8"-24 threads. The backing pad threads onto the tool spindle, and the disc nut holds the abrasive disc onto the backing pad. The disc nut included with the pad is not available as a replacement. The F4850N disc nut is a heavier-duty replacement. This pad is used with abrasive discs with a 7/8" center hole.

Item
Number
Item
Description
Max.
RPM
Each
Price
10 ea
Price
25 ea
Price
 
F48315" backing pad and disc nut18,000Add to cart | Add to list
F4850Ndisc nut Add to cart | Add to list

Used on 7/16"-20 threaded tool spindles

5" plastic backing pad with internal 7/16"-20 threads. The backing pad threads onto the tool spindle, and the disc nut holds the abrasive disc onto the backing pad. The disc nut included with the pad is not available as a replacement. The F4850N disc nut is a heavier-duty replacement. This pad is used with abrasive discs with a 7/8" center hole.

Item
Number
Item
Description
Max.
RPM
Each
Price
10 ea
Price
25 ea
Price
 
F48305" backing pad with disc nut18,000Add to cart | Add to list
F4850Ndisc nut Add to cart | Add to list

Used on 3/8"-24, 7/16"-20, and 5/8"-11 threaded spindles

3" and 41/2" fiber backing discs. Each pack contains three 3" diameter discs and three 4 1/2" diameter discs. If a 5" abrasive disc is used, both the 3" and the 4 1/2" fiber backing discs must be used together. These backing discs are used with abrasive discs with a 7/8" center hole. Disc nuts are not included with backing discs. Order disc nut separately, to fit the tool spindle you are using. Maximum RPM: 30,000 for 3" fiber discs and 24,000 for 5" fiber discs.

Item
Number
Item
Description
Unit
Price
10 unit
Price
25 unit
Price
 
F4833fiber backing discs, 3 pair/packAdd to cart | Add to list
F4835disc nut for 3/8"-24 tools spindlesAdd to cart | Add to list
F4834disc nut for 7/16"-20 tools spindlesAdd to cart | Add to list
F4850Ndisc nut for 5/8"-11 tools spindlesAdd to cart | Add to list

Reinforced phenolic backing plates

with 7/8" depressed center hole. A smaller size plate can be stacked behind a bigger plate for more rigidity. Disc nuts are not included with plates. Order disc nuts separately, to fit your tool spindle size.

Item
Number
Item
Description
Max.
RPMEach
Price
10 ea
Price
25 ea
Price
 
F4851A3" backing pad6,000Add to cart | Add to list
F4851B4" backing pad6,000Add to cart | Add to list
F4851F41/2" backing pad6,000Add to cart | Add to list
F4851C5" backing pad6,000Add to cart | Add to list
F4851D7" backing pad6,000Add to cart | Add to list
F4835disc nut for 3/8"-24 spindles Add to cart | Add to list
F4834disc nut for 7/16"-20 spindles Add to cart | Add to list
F4850Ndisc nut for 5/8"-11 spindles Add to cart | Add to list

Used on 5/8"-11 threaded tool spindles

Firm plastic backing pads with 5/8"-11 internal metal threads and heavy-duty grinding supports. The backing pad threads onto the tool spindle, and the disc nut holds the abrasive disc onto the backing pad. For discs with 7/8" center hole. Disc nuts are not included with pads. Order disc nuts separately.

Item
Number
Item
Description
Max.
RPM
Each
Price
10 ea
Price
25 ea
Price
 
F4850A4" backing pad7,000Add to cart | Add to list
F4850B41/2" backing pad7,000Add to cart | Add to list
F4850C5" backing pad7,000Add to cart | Add to list
F4850D7" backing pad7,000Add to cart | Add to list
F4850Ndisc nut for all 4 of these pads Add to cart | Add to list

5" plastic backing pad

with internal 5/8"-11 threads. The backing pad threads onto the tool spindle, and the disc nut holds the abrasive disc onto the backing pad. The nut included with the pad is not available as a replacement. The F4850N disc nut is a heavier-duty replacement. This pad is used with abrasive discs with a 7/8" center hole.

Item
Number
Item
Description
Max.
RPM
Each
Price
10 ea
Price
25 ea
Price
 
F4831A5" backing pad and disc nut18,000Add to cart | Add to list
F4850Ndisc nut Add to cart | Add to list

Used on 5/8"-11 threaded tool spindles, Spiralcool

Spiralcool's slotted hub draws cool air behind the disc. Spiral ribs provide contact points forming channels for air flow, extending disc life 30% to 50%. These backing pads are ruggedly built, lightweight, and stay in balance. Rigid type backing pads are used for straight flat work. Medium or flexible backing pads are used for contours. Other general recommendations: Rigid for 16-24 grit discs, Medium for 36-60 grit discs, and Flexible for 80-120 grit discs. Disc nuts are not included with these pads. Order center nut separately from the accessories listed below. Center nuts are available for different abrasive disc diameters.

Spiral rib face pad, threaded bore with 5/8"-11 internal threads. The backing pad threads onto the tool spindle, and the center nut holds the abrasive disc onto the backing pad. For discs with 7/8" center hole. Disc nuts are not included with pads. Order disc nuts separately from the accessories listed below. Two sizes of center nuts are available, for different abrasive disc diameters.

Item
Number
Item
Description
Mfg.
Number
Max.
RPM
Each
Price
6 ea
Price
25 ea
Price
50 ea
Price
 
F48004" flexibleF400R12,000Add to cart | Add to list
F48024" mediumR400R12,000Add to cart | Add to list
F48044" rigidH400R12,000Add to cart | Add to list
F480641/2" flexibleF425R11,000Add to cart | Add to list
F480841/2" mediumR425R11,000Add to cart | Add to list
F481041/2" rigidH425R11,000Add to cart | Add to list
F48125" flexibleF500R10,000Add to cart | Add to list
F48145" mediumR500R10,000Add to cart | Add to list
F48165" rigidH500R10,000Add to cart | Add to list
F48187" flexibleF700R7,000Add to cart | Add to list
F48197" mediumR700R8,500Add to cart | Add to list
F48207" rigidH700R8,500Add to cart | Add to list

Spiral rib face pad with unthreaded 5/8" bore.

No nose on back side of the hub, but the same spiral rib face as backing pads above. These "flat back pads" are used on tools with a shorter spindle. Instead of backing pad threading onto tool spindle, the center nut holds the disc and the pad onto tool. Disc nuts are not included with these pads. Order center nut separately from accessories listed below. Two sizes of center nuts are available, for different abrasive disc diameters.

Item
Number
Item
Description
Mfg.
Number
Max.
RPM
Each
Price
6 ea
Price
25 ea
Price
50 ea
Price
 
F48014" flexibleF4005∕8SB12,000Add to cart | Add to list
F48034" mediumR4005∕8SB12,000Add to cart | Add to list
F48054" rigidH4005∕8SB12,000Add to cart | Add to list
F480741/2" flexibleF4255∕8SB11,000Add to cart | Add to list
F480941/2" mediumR4255∕8SB11,000Add to cart | Add to list
F481141/2" rigidH4255∕8SB11,000Add to cart | Add to list
F48135" flexibleF5005∕8SB10,000Add to cart | Add to list
F48155" mediumR5005∕8SB10,000Add to cart | Add to list
F48175" rigidH5005∕8SB10,000Add to cart | Add to list

Smooth face high speed pads, threaded bore with 5/8"-11 internal threads.

Used on high speed sanders. The backing pad threads onto the tool spindle, and the center nut holds the abrasive disc onto the backing pad. For discs with 7/8" center hole. Disc nuts are not included with pads. Order disc nuts separately from the accessories listed below. Two sizes of center nuts are available, for different abrasive disc diameters.

Item
Number
Item
Description
Mfg.
Number
Max.
RPM
Each
Price
6 ea
Price
25 ea
Price
50 ea
Price
 
F48234" mediumRHS400SF-R18,000Add to cart | Add to list
F48245" mediumRHS500SF-R13,000Add to cart | Add to list

Accessories for Spiralcool backing pads

F4825 and F4826 center nuts both have 5/8"-11 internal threads. The difference between these center nuts is their flange diameter. F4825 has a 2" flange diameter. F4826 has a 1 1/2" flange diameter. The F4829 spanner wrench fits both of these center nuts.

Item
Number
Item
Description
Each
Price
6 ea
Price
25 ea
Price
50 ea
Price
 
F4825center nut for 7" padsAdd to cart | Add to list
F4826center nut for 4" to 5" padsAdd to cart | Add to list
F4827adapter, 3/8"-24 to 5/8"-11Add to cart | Add to list
F4828adapter, 7/16"-20 to 5/8"-11Add to cart | Add to list
F4829spanner wrench for both center nutsAdd to cart | Add to list

Adjustable spanner wrench

The fixed pin Spiralcool spanner wrench shown above does not fit all the other backing pads on this page. But this adjustable wrench pivots to allow the two pins to fit multiple different disc nuts.