Item # RDJ307SN9, RDJ300 Inserts - Ring Locked w/ C´Bore Fine Internal and External Threads On Howmet Aerospace

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Unit of Measure

Insert Type	N/A Standard
Series	N/A RDJ300
Material Type	N/A 4340 Steel (Alternate 4140 Steel)
Material Specification	N/A MIL-S-5000 (AMS-S-5625)
Heat Treat	N/A 160-180 KSI UTS
Finish	N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3
Lockring Howmet Part Number	N/A RLRR31SB9
Internal Thread Lock	N/A No
A - Internal Thread, Class 3B¹	N/A 0.3125-24 UNJF
B - External Thread	N/A 0.4375-20
B - External Thread - Pitch Diameter	N/A 0.4053-0.4073 in
B - External Thread - Minor Diameter	N/A 0.3700-0.3784 in
C - Length ±.015	N/A 0.560 in
D ±.015	N/A 0.380 in
E ±.005	N/A 0.095 in
F ±.005	N/A 0.323 in

Aluminum Step Drill Part Number²	N/A RCDC31-386
Magnesium Step Drill Part Number³	N/A RCADC31-386
Basic Tap Size⁴	N/A 0.4375-20 UNF
Wrench Part Number	N/A R1107W
Lockring Drive Tool Part Number	N/A R207D
Removal Drill Size⁵	N/A U

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.
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