Spur Gears - Norfolk Bearings and Supply Company, Inc.

F
BOStonE Molded Plastic Bearings
Boston stocks Cylindrical, Flanged and Roll End Bearings in five
materials —
1. Nylon (N) exhibits good chemical and corrosion resistance.
Excellent abrasion resistance and low surface friction provide
long wear without lubrication. These nylon bearings are black.
Good up to 225ºF maximum.
2. Delrin® and Celcon® (D) are trademarks for equivalent Acetal
Resins produced by Du Pont and Celanese respectively.
Acetals possess excellent moisture resistance characteristics.
These materials are white. Good up to 225ºF maximum.
3. Nylatron® GS (GS) is a trademark for molybdenum disulfide
filled nylon produced by the Polymer Corp. Nylatron® GS
exhibits excellent abrasion resistance. Nylatron® GS is dark
gray in color. Good up to 225ºF maximum.
4. Teflon filled Acetal (AF) — Teflon.® This material has excellent
abrasion and corrosion resistance and high lubricity against
steel. Good up to 225ºF maximum.
5. Teflon filled Nylon (TN) used for Hanger Bearings only, is light
gray in color.
Roll End Bearings
These bearings are available in almost every conceivable size
directly from stock — no costly waiting, tooling or set-up
charges.
Sizes are interchangeable with existing wood and ball bearings.
Several objectives can be met with Roll End Bearings made of
our selected plastic resins.
1. No lubricant required
2. Clean — Neat appearance
3. Non-contamination
4. Resistant to moisture & chemicals
5. Quiet operation
6. Excellent load & wear ratings
Roll End Bearings have ribbed construction to allow closer
dimensional control, to help dissipate heat and to reduce cost.
These designs help prevent distortion or seizure of bearing bore,
normally caused by high press fits, temperature change and
moisture absorption.
Size variation is easily accomplished by rebore or remachine
operations, simply state size desired. Bores can be reduced with
bushing inserts. Adaptors are available for hex shafts.
(AF) Roll End Bearings, 3" and up, are Delrin or Celcon with a
Teflon filled Acetal bushing. This combination provides a low cost
unit with the superior properties of a Teflon filled bearing.
However, one piece Teflon filled Acetal bearings can be offered
upon request.
For bearings not shown — write for prices stating quantity
desired.
Blind Bore Bearings
Blind Bore Bearings are available on special order. Minimum
quantities will apply. They are available for roll end bearing sizes
818 through 2216 and 8P40 through 20P40. Depth of blind
bores is 1/8" less than total bearing length. When ordering, add
“B” to Catalog Number.
Selection
A general guide to determination of limiting load and velocity
values for sleeve bearings has been established by the use of PV
calculations. PV represents Pressure x Velocity, for example: 100
psi x 20 fpm yields a PV of 2000.
Maximum PV values for BostonE Molded Plastic Bearings are:
Nylon (N) — 3,000
Delrin or Celcon (D) — 3,000
Nylatron GS (GS) — 4,000
Teflon filled Acetal (AF) — 8,000
Teflon filled nylon (TN) — 10,000
For complete selection and application information, see
Engineering Section, Pages 174-181.
Teflon® is a registered trademark of Dupont.
160 Boston Gear 800-825-6544 P-1930-BG 04/10