MS21251 Turnbuckle Barrels
These supersede AN155 and NAS649 barrels. MS21251 turnbuckle barrel items can replace AN155 of like materials and thread, but the AN155 items cannot replace the MS21251 items. MS21251 items are interchangeable with the NAS649 items of like material and thread.
MS21251 barrels are available in brass (QQ-B-637, composition 2 or MIL-T-6945), steel, (cadmium plated to QQ-P-416, Type 2, Class 3) or aluminium alloy (anodised to MIL-A-8725). The cross reference table shows items made of brass.
Clip-locking turnbuckles utilise two MS21256 locking clips instead of locking wire for safety. The turnbuckle barrel and terminals are slotted lengthways to accommodate the locking clips. After the proper cable tension is reached the barrel slots are aligned with the terminal slots and the clips are inserted. The curved end of the locking clips expand and latch in the vertical slot in the centre of the barrel.
Turnbuckle Parts
MS items can replace AN items of like thread except for the -22 and -61 sizes, but the AN items cannot replace the MS items. MS items are interchangeable with the NAS items of like thread except for the -22 and -61 sizes. These MS terminals are available only in steel, QQ-P-416, Type 2, Class 3. Available with right (R) or left hand (L) threads.
| Fork Dash Number | Takes Pin | Approx Width Betwen Jaws | Length from top of thread to centre of pin hole |
|---|
| -2 | SP4Y-B1 | 0.1” | 1 1/8” |
| -3 | SP4Y-B3 | 0.15” | 1 1/8” |
| -5 | SP4Y-D5 | 0.2” | 1 1/4” |
MS21256 Turnbuckle Clip
Made of corrosion resistant steel wire, QQ-W-423, composition FS302, Condition B. These are NOT interchangeable with the NAS651 clips.
