MS27640 at a glance

Specification

Item	Value
Type	Airframe bearing, antifriction
Material	Airframe antifriction bearing
Status	Check the current issue of the standard before design use.

Dimension, in	-3A	-4	-5	-6
B — bore (+.0000 / -.0005)	.1900	.2500	.3125	.3750
D — outside diameter (+.0000 / -.0005)	.6250	.9014	1.2500	1.4375
W — width of inner ring (+.000 / -.005)	.245	.484	.558	.620
H — width of outer ring (+.000 / -.005)	.203	.335	.375	.469
A — shoulder diameter, inner (approx.)	.280	.390	.469	.591
E — inner ring bore chamfer (+.015 / -.000)	.005	.005	.005	.015
C — outer ring OD chamfer (+.015 / -.000)	.010	.032	.032	.032
Radial limit — Radial limit load, lb	1880	2680	5620	7910
Thrust limit — Thrust limit load, lb	900	1200	2500	3500
Rating, Case I — Radial load rating, lb, Case I (avg. life 10,000 complete 90° cycles)	1700	2410	4900	6540
Rating, Case II — Radial load rating, lb, Case II (avg. life 10,000 complete 90° cycles)	1450	2030	3970	5410

Dimensions in inches, loads in pounds, as tabulated; tolerances in the dimension names.

Dash numbers of the standard, each with its own link.

Part	Meaning
Format	MS27640-<dash>
Example	MS27640-3A — dash 3A

Case I and Case II are the two radial load rating columns of the listing, for an average life of 10,000 complete 90° cycles.
Part numbers of the manufacturer (Mfg. P/N) are given as listed.
Bore tolerance and outer diameter tolerance as in the headings; the width tolerances of the listing are shown against W and H.

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MS27640 — Airframe Bearing, Antifriction, Heavy Duty — nominal sizes and part numbers.