NFP Series

                                                                                                                                                                    
Part
Number
Thread
Size
Metric
Equiv.
A B C Minimum
Sheet
HoleSize
In Sheet
Minimum
Boss Dia.
NFP440 4-40 M3x0.5 .187 .225 .181 .240 .187 .500
NFP632 6-32 M3.5x0.6 .187 .225 .181 .240 .187 .500
NFP832 8-32 M4x0.7 .250 .260 .238 .275 .250 .625
NFP1024 10-24 --- .250 .260 .238 .275 .250 .625
NFP1032 10-32 M5x0.8 .250 .260 .238 .275 .250 .625
NFP25020 1/4-20 M6x1.0 .312 .308 .295 .328 .312 .750
NFP25028 1/4-28 --- .312 .308 .295 .328 .312 .750
NFP31218 5/16-18 M8x1.25 .375 .360 .360 .380 .375 .950
NFP31224 5/16-24 --- .375 .360 .360 .380 .375 .950

Notes:
Thread spec per MIL-S-7742
300 Series Stainless Steel per MIL-S-7720 ASTM A581/A582
Brass per ASTM-B-16
Aluminum - 6061-T6 per QQ-A-225/8, QQ-A-200/8, QQ-A-225/10
300 Series Stainless Steel per MIL-S-7720 ASTM A581/A582
Dimensional Limits plus or minus .005, unless specified.
Installation Hole Tolerance +.003 / -.000
Class 3A/4H screw must pass with finger torque, but basic go gauge may stop at last thread. (Applies to Stainless Steel Only
)

Part Number Example

NFPA-632

Series: NFP, Material: Alum, Thread 6-32




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