Item # RJ306SF8, RJ300 Inserts - Ring Locked, Fine Internal and External Threads On Howmet Aerospace

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Unit of Measure

Insert Type	N/A Standard
Series	N/A RJ300
Material Type	N/A 17-4PH CRES
Material Specification	N/A AMS 5643
Heat Treat	N/A COND H1025
Finish	N/A Passivate per AMS2700
Lockring Howmet Part Number	N/A RLRR28SB8
Lockring Military Part Number	N/A MS51990-106P
Internal Thread Lock¹	N/A No
A - Internal Thread, Class 3B	N/A 0.2500-28 UNJF
B - External Thread	N/A 0.3750-24
B - External Thread - Pitch Diameter	N/A 0.3479-0.3498 in
B - External Thread - Minor Diameter	N/A 0.3185-0.3257 in
C - Length ±.015	N/A 0.500 in
D ±.015	N/A 0.330 in

Aluminum Step Drill Part Number²	N/A RCDC28-332
Magnesium Step Drill Part Number³	N/A RCADC28-332
Basic Tap Size⁴	N/A 0.3750-24 UNF
Wrench Part Number	N/A R1106W
Lockring Drive Tool Part Number	N/A R206D
Removal Drill Size⁵	N/A 5/16

N/A

The external thread has a special pitch diameter and minor diameter which installs into an AS8879 Class 3B, FED-STD-H28/2 Class 3B, or National Class 3 tapped hole.
Unless otherwise specified dimensions are in inches & per ASME Y14.5M.
Mating lockring is not included with insert. It must be ordered separately.
For 1117 steel case hardened to 50-60 HRC, add suffix EO328 to lockring part number.
Machine surface to be 125 microinches Ra per ANSI B46.1, except serrated collar.
When parent material surface is not flat or normal to axis of hole, provide a spotface for proper lockring entry.
Remove all burrs and sharp edges.

¹ AS8879 Internal Thread
² Step drills are designed for thru hole drilling. When used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.
³ Step drills are designed for thru hole drilling. When used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.
⁴ Taps are not supplied by Howmet.
⁵ Removal drills are not supplied by Howmet.

Insert Type