Item # RDJ305SA7L, 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 4130 Steel
Material Specification	N/A AMS-S-6758, COND F
Heat Treat	N/A 125 KSI UTS min
Finish	N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3
Lockring Howmet Part Number	N/A RLRR24SB7
Lockring Military Part Number	N/A MS51990-105P
Internal Thread Lock	N/A Yes
A - Internal Thread, Class 3B¹	N/A 0.1900-32 UNJF
B - External Thread	N/A 0.3125-24
B - External Thread - Pitch Diameter	N/A 0.2858-0.2873 in
B - External Thread - Minor Diameter	N/A 0.2559-0.2632 in
C - Length ±.015	N/A 0.440 in
D ±.015	N/A 0.290 in
E ±.005	N/A 0.062 in
F ±.005	N/A 0.196 in

Aluminum Step Drill Part Number²	N/A RCDC24-272
Magnesium Step Drill Part Number³	N/A RCADC24-272
Basic Tap Size⁴	N/A 0.3125-24 UNF
Wrench Part Number	N/A R1105W
Lockring Drive Tool Part Number	N/A R205D
Removal Drill Size⁵	N/A F

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