DIN15421 CRANE PULLEYS

Form B with deep groove ball bearings and inner bushing

Think of it as the “protected-performance” version: a deep-groove ball bearing, plus an inner bushing to shield the shaft from wear and misalignment. It spins smoothly under load, spreads stress evenly, and keeps rope tracking true—especially where precision and safety can’t be compromised, like overhead cranes handling heavy or critical lifts.

Designation of a pulley of d2= 500 mm and r1= 10.5:

Rope Pulley 500 x10,5 DIN 15421

Grooved profile (r1) according to DlN 15061 part 1

Materials sheave:

cast steelGS-60 or GS-42CrMo4

forged from C45,C60 or42CrMo4

on request with hardened rope groove

no welded version made of St52

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Ready to stop worrying about sheave wear—or shaft scoring?
The DIN 15421’s inner bushing + ball bearing combo is built for that exact peace of mind.

Tell us your size or setup—we’ll get you a proper quote, fast. Custom? No problem.

DIN15421 Crane Pulleys with deep groove ball bearings and inner bushing

Drawing of Crane Pulleys

Specifications of Crane pulley

Application	d2	r1	d1	d3	d5 (E9)	d6 (h6)	d7 (K7)	b1	b2 (0/-0.2)	b3 (0/-0.2)	Deep grooved ball bearing DIN 625
2 – sheaves bottom hook block	225	4,8	9	260	45	60	110	32	60	100	6212
	280	6	11	320	55	70	125	38	65	110	6214
	315	7	13	360	60	70	125	44	65	110	6214
	355	7,5	14	405	70	80	140	48	70	110	6216
	400	8,5	16	455	75	90	160	52	80	130	6218
	450	9,5	18	510	80	100	180	60	85	130	6220
	500	10,5	20	570	90	110	200	62	95	140	6222
	560	12	22	630	100	120	215	70	100	150	6224
	630	14	26	710	110	130	230	72	100	160	6226
	710	15	28	790	120	140	250	80	100	160	6228
	800	17	32	890	130	150	270	90	110	160	6230
	900	19	36	1010	140	160	290	100	115	160	6232
2 – sheaves bottom hook block	560	10,5	20	630	140	160	240	62	95	140	6032
	630	12	22	700	150	170	260	70	100	150	6034
	710	14	26	790	170	190	290	72	110	160	6038
	800	15	28	880	180	200	310	80	120	170	6040
	900	17	32	990	200	220	340	90	130	180	6044
	1000	19	36	1110	220	240	360	100	130	180	6048
	1120	21	40	1240	240	260	400	112	150	210	6052
	1250	24	44	1380	260	280	420	125	150	210	6056

Why the inner bushing matters:

It’s not a simple spacer—it’s a precision steel sleeve (often C45 or 42CrMo4, hardened), pressed into the sheave hub. When wear happens, this part takes the hit—not your shaft. Swap it out in minutes during maintenance; no lathe, no downtime.

When to Choose DIN 15421 (vs. DIN15418 or plain bearing types)

Pick DIN 15421 when:
• Your shafts are expensive or hard to replace (the bushing absorbs wear, not the shaft)
• Loads are heavy and alignment isn’t perfect (bushing tolerates slight misalignment)
• You want ball-bearing efficiency without risking direct metal-on-metal contact
DIN 15418 (no bushing) is great for clean, aligned systems—but 15421 is the smarter choice for real-world, high-stakes environments.