TOOLS · GLOSSARY
Bearings & Housings — Belt Conveyor Glossary
80 terms on Bearings & Housings, each with its working definition, the governing symbol or formula where one exists, and a link to the standard behind it.
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80 terms
Deep groove ball bearing 6204
Idler bearing, 20 × 47 × 14 mm. The smallest standard bore used in light-duty 89 mm rolls.
Deep groove ball bearing 6205
Idler bearing, 25 × 52 × 15 mm. Standard fit for 108 mm idler rolls.
Deep groove ball bearing 6206
Idler bearing, 30 × 62 × 16 mm. The most widely used conveyor idler bearing.
Deep groove ball bearing 6207
Idler bearing, 35 × 72 × 17 mm. Used in 133 mm and heavier rolls.
Deep groove ball bearing 6208
Idler bearing, 40 × 80 × 18 mm. Heavy-duty carrying idlers and return rolls.
Deep groove ball bearing 6209
Idler bearing, 45 × 85 × 19 mm. 159 mm rolls and impact idlers.
Deep groove ball bearing 6210
Idler bearing, 50 × 90 × 20 mm. Large-diameter rolls on high-tonnage lines.
Deep groove ball bearing 6305
Heavy-series idler bearing, 25 × 62 × 17 mm; higher load rating than 6205 in the same bore.
Deep groove ball bearing 6306
Heavy-series idler bearing, 30 × 72 × 19 mm. Common in high-speed / high-load idlers.
Deep groove ball bearing 6307
Heavy-series idler bearing, 35 × 80 × 21 mm.
Deep groove ball bearing 6308
Heavy-series idler bearing, 40 × 90 × 23 mm.
Deep groove ball bearing 6309
Heavy-series idler bearing, 45 × 100 × 25 mm.
Deep groove ball bearing 6310
Heavy-series idler bearing, 50 × 110 × 27 mm.
Deep groove ball bearing 6311
Heavy-series idler bearing, 55 × 120 × 29 mm.
Deep groove ball bearing 6312
Heavy-series idler bearing, 60 × 130 × 31 mm.
Deep groove ball bearing 6313
Heavy-series idler bearing, 65 × 140 × 33 mm.
Deep groove ball bearing 6314
Heavy-series idler bearing, 70 × 150 × 35 mm.
ZZ shielded bearing
Deep groove bearing with two steel shields; retains grease and blocks coarse dust.
2RS sealed bearing
Deep groove bearing with two contact rubber seals; best for dusty idler service.
Self-aligning ball bearing 1204
Two-row self-aligning bearing, 20 × 47 × 14 mm; tolerates shaft deflection in light idlers.
Self-aligning ball bearing 1205
Two-row self-aligning bearing, 25 × 52 × 15 mm.
Self-aligning ball bearing 1206
Two-row self-aligning bearing, 30 × 62 × 16 mm.
Self-aligning ball bearing 1207
Two-row self-aligning bearing, 35 × 72 × 17 mm.
Self-aligning ball bearing 1305
Wide-series self-aligning bearing, 25 × 62 × 17 mm.
Self-aligning ball bearing 1306
Wide-series self-aligning bearing, 30 × 72 × 19 mm.
Self-aligning ball bearing 1307
Wide-series self-aligning bearing, 35 × 80 × 21 mm.
Self-aligning ball bearing 1308
Wide-series self-aligning bearing, 40 × 90 × 23 mm.
Spherical roller bearing 22206
Spherical roller bearing, 30 × 62 × 20 mm. Very high radial capacity for pulley and heavy idler service.
Spherical roller bearing 22207
Spherical roller bearing, 35 × 72 × 23 mm.
Spherical roller bearing 22208
Spherical roller bearing, 40 × 80 × 23 mm.
Spherical roller bearing 22209
Spherical roller bearing, 45 × 85 × 23 mm.
Spherical roller bearing 22210
Spherical roller bearing, 50 × 90 × 23 mm.
Spherical roller bearing 22211
Spherical roller bearing, 55 × 100 × 25 mm.
Spherical roller bearing 22212
Spherical roller bearing, 60 × 110 × 28 mm.
Spherical roller bearing 22213
Spherical roller bearing, 65 × 120 × 31 mm.
Spherical roller bearing 22214
Spherical roller bearing, 70 × 125 × 31 mm.
Spherical roller bearing 22215
Spherical roller bearing, 75 × 130 × 31 mm.
Spherical roller bearing 22216
Spherical roller bearing, 80 × 140 × 33 mm.
Spherical roller bearing 22217
Spherical roller bearing, 85 × 150 × 36 mm.
Spherical roller bearing 22218
Spherical roller bearing, 90 × 160 × 40 mm. Typical main bearing of a Ø630–800 mm pulley.
Spherical roller bearing 22219
Spherical roller bearing, 95 × 170 × 43 mm.
Spherical roller bearing 22220
Spherical roller bearing, 100 × 180 × 46 mm.
Spherical roller bearing 22222
Spherical roller bearing, 110 × 200 × 53 mm.
Spherical roller bearing 22224
Spherical roller bearing, 120 × 215 × 58 mm. Large drive-pulley bearing.
Tapered roller bearing 30206
Single-row tapered roller bearing, 30 × 62 × 17.25 mm; takes combined radial and axial load.
Tapered roller bearing 30208
Single-row tapered roller bearing, 40 × 80 × 19.75 mm.
Tapered roller bearing 30210
Single-row tapered roller bearing, 50 × 90 × 21.75 mm. Used in paired arrangement on pulley shafts.
Tapered roller bearing 30212
Single-row tapered roller bearing, 60 × 110 × 23.75 mm.
Cylindrical roller bearing NU206
Single-row cylindrical roller bearing, 30 × 62 × 16 mm; high radial capacity, no axial location.
Cylindrical roller bearing NU208
Single-row cylindrical roller bearing, 40 × 80 × 18 mm.
Cylindrical roller bearing NU210
Single-row cylindrical roller bearing, 50 × 90 × 20 mm.
Cylindrical roller bearing NU212
Single-row cylindrical roller bearing, 60 × 110 × 22 mm.
Cylindrical roller bearing NU214
Single-row cylindrical roller bearing, 70 × 125 × 24 mm.
Cylindrical roller bearing NU216
Single-row cylindrical roller bearing, 80 × 140 × 26 mm.
Cylindrical roller bearing NU218
Single-row cylindrical roller bearing, 90 × 160 × 30 mm.
Pillow block housing UCP204
Cast-iron pillow block with a 20 mm insert bearing; light conveyor and screw take-up duties.
Pillow block housing UCP205
Cast-iron pillow block with a 25 mm insert bearing.
Pillow block housing UCP206
Cast-iron pillow block with a 30 mm insert bearing.
Pillow block housing UCP207
Cast-iron pillow block with a 35 mm insert bearing.
Pillow block housing UCP208
Cast-iron pillow block with a 40 mm insert bearing.
Pillow block housing UCP210
Cast-iron pillow block with a 50 mm insert bearing.
Pillow block housing UCP212
Cast-iron pillow block with a 60 mm insert bearing.
Flanged housing UCFL
Two-bolt oval flange housing for mounting on a conveyor frame face.
Flanged housing UCF
Four-bolt square flange housing; rigid mounting on structural steel.
Take-up housing UCT
Slide-type housing that runs in a take-up frame to tension the belt.
Split plummer block SN 505
Two-piece cast-iron housing for shafts from 20 mm; takes spherical roller or self-aligning bearings.
Split plummer block SN 507
Two-piece housing for 30 mm shafts; standard on small and medium pulleys.
Split plummer block SN 510
Two-piece housing for 45 mm shafts.
Split plummer block SN 512
Two-piece housing for 55 mm shafts.
Split plummer block SN 514
Two-piece housing for 65 mm shafts; typical drive-pulley bearing block.
Bearing housing (idler end cap)
Pressed-steel or cast end cap that holds the idler bearing and seals it against dust.
Triple labyrinth seal
Three-stage labyrinth used on premium idlers for wet, dusty and washdown conditions.
Felt seal
Felt ring that wipes the shaft and retains grease; economical but wears in abrasive dust.
Contact lip seal
Rubber lip seal with a garter spring; positive sealing but higher friction torque.
V-ring seal
All-rubber axial seal that flings dust off as the shaft rotates.
Grease nipple (M10×1)
Standard lubrication point on pulley bearing blocks and take-up units.
Lithium EP2 grease
NLGI grade 2 lithium grease with EP additives; the default idler and pulley bearing grease.
Sealed-for-life idler
Idler greased and sealed at the factory with no regreasing point; maintenance-free for its service life.
Bearing clearance class (C3)
Increased internal clearance for hot running or interference fits. C3 is normal on conveyor idlers; CN would preload and fail.
Bearing rating life (L10)
Life reached by 90 % of an identical bearing group under the same load. The basis for setting idler guarantee periods.
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